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Tadayuki Kodama

Section

Graduate School of Science

Job title

Professor

Degree

修士（理学）（東京大学）
博士（理学）（東京大学）

researchmap

https://researchmap.jp/7000022489

J-GLOBAL ID

201801001586793386

Education 2

University of Tokyo　School of Science　Department of Astronomy

1992/04 - 1997/03
Kyoto University　Department of Science　Department of Astronomy

1988/04 - 1992/03

Professional Memberships 1

THE ASTRONOMICAL SOCIETY OF JAPAN

Research Interests 3

Galaxy evolution
Galaxy formation
Galactic Astronomy

Research Areas 1

Natural sciences / Astronomy / Galactic astronomy

Papers 221

A Systematic Search of Distant Superclusters with the Subaru Hyper Suprime-Cam Survey

Tsung Chi Chen, Yen Ting Lin, Hsi Yu Schive, Masamune Oguri, Kai Feng Chen, Nobuhiro Okabe, Sadman Ali, Connor Bottrell, Roohi Dalal, Yusei Koyama, Rogério Monteiro-Oliveira, Rhythm Shimakawa, Tomotsugu Goto, Bau Ching Hsieh, Tadayuki Kodama, Atsushi J. Nishizawa

Astrophysical Journal　975　(2)　2024/11/01

DOI： 10.3847/1538-4357/ad76ad 　

ISSN： 0004-637X

eISSN： 1538-4357
Project overview and update on ULTIMATE-Subaru: the next-generation wide-field AO instrument for the Subaru telescope

Yosuke Minowa, Yusei Koyama, Masayuki Akiyama, Sadman Ali, Takamasa Bando, Joshua Carter, David E. Chandler, Chi-Yi Chou, Jesse Cranney, Céline D'Orgeville, Yutaka Hayano, Takashi Hattori, Roger Haynes, Dionne Haynes, Angela Hernandez Delgado, Nicholas Herrald, Masayuki Hirabayashi, Junichi Katakura, Masahiko Kimura, Tadayuki Kodama, Masahiro Konishi, Andrew Kruse, Noelia Martínez Rey, Kumiko Morihana, Masaki Morita, Kentaro Motohara, Yoshiyuki Obuchi, Hajime Ogane, Hirofumi Okita, Yoshito Ono, Shin Oya, Naohisa Sato, Yuhei Takagi, Hideki Takami, Ichi Tanaka, Yoko Tanaka, Koki Terao, Chihiro Tokoku, Fumihiro Uraguchi, Lu Wang, Shiang-Yu Wang, Kenshi Yanagisawa, Hiroshige Yoshida, Michitoshi Yoshida

Ground-based and Airborne Instrumentation for Astronomy X　46-46　2024/08/05
Publisher: SPIE
DOI： 10.1117/12.3018698 　
Development of novel high-efficiency and wideband medium-dispersion grisms for MOIRCS at Subaru Telescope

Ichi Tanaka, Noboru Ebizuka, Chihiro Tokoku, Takashi Hattori, Yusei Koyama, Kentaro Motohara, Michael Lemmen, Brian Elms, Koji Omata, Yosuke Minowa, Tadayuki Kodama

Ground-based and Airborne Instrumentation for Astronomy X　2024/07/18
Publisher: SPIE
DOI： 10.1117/12.3019508 　
Star-formation activity of low-mass galaxies at the peak epoch of galaxy formation probed by deep narrow-band imaging

Kazuki Daikuhara, Tadayuki Kodama, Jose M Pérez-Martínez, Rhythm Shimakawa, Tomoko L Suzuki, Ken-ichi Tadaki, Yusei Koyama, Ichi Tanaka

Monthly Notices of the Royal Astronomical Society　531　(2)　2335-2355　2024/05/29
Publisher: Oxford University Press (OUP)
DOI： 10.1093/mnras/stae1243 　

ISSN： 0035-8711

eISSN： 1365-2966

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ABSTRACT Low-mass galaxies at high redshifts are the building blocks of more massive galaxies at later times and are thus key populations for understanding galaxy formation and evolution. We have made deep narrow-band observations for two protoclusters and the general field in COSMOS at z ∼ 2. In a clumpy young protocluster, USS1558−003, at z = 2.53, we find many star-forming galaxies well above the star-forming main sequence of field galaxies at the low-mass end ($M_{\star }/\mathrm{ { \rm M}_{\odot } }\lt 10^{8.9}$). This suggests that some environmental effects may be at work in low-mass galaxies in high-density regions to enhance their star-formation activities. In the core of this protocluster, we also find enhanced star-formation activity of middle-mass galaxies ($10^{8.9} \lt M_{\star }/\mathrm{ { \rm M}_{\odot } } \lt 10^{10.2}$) while such trends are not observed in a more mature protocluster, PKS1138−262 at z = 2.16. We expect these activities to be mainly due to galaxy mergers/interactions and differences in the amount of cold gas accretion. As one piece of evidence, we show that the star-formation activity within individual galaxies in the protoclusters is more centrally concentrated than those in the field. This is probably due to enhanced interactions between galaxies in the protocluster, which can reduce the angular momentum of the gas, drive the gas towards the galaxy centre, and lead to a central starburst.
Multiple Emission Lines of Hα Emitters at z ∼ 2.3 from the Broad- and Medium-band Photometry in the ZFOURGE Survey

Nuo Chen, Kentaro Motohara, Lee Spitler, Kimihiko Nakajima, Rieko Momose, Tadayuki Kodama, Masahiro Konishi, Hidenori Takahashi, Kosuke Kushibiki, Yukihiro Kono, Yasunori Terao

The Astrophysical Journal　964　(1)　5-5　2024/03/01
Publisher: American Astronomical Society
DOI： 10.3847/1538-4357/ad20cc 　

ISSN： 0004-637X

eISSN： 1538-4357

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Abstract We present a multiple emission line study of ∼1300 Hα emitters (HAEs) at z ∼ 2.3 in the ZFOURGE survey. In contrast to the traditional spectroscopic method, our sample is selected based on the flux excess in the ZFOURGE K_s broadband data relative to the best-fit stellar continuum. Using the same method, we also extract the strong diagnostic emission lines for these individual HAEs: [O iii] λλ4959, 5007 and [O ii] λλ3726, 3729. Our measurements demonstrate good consistency with those obtained from spectroscopic surveys. We investigate the relationship between the equivalent widths (EWs) of these emission lines and various galaxy properties, including stellar mass, stellar age, star formation rate, specific star formation rate, and ionization state (O32). We have identified a discrepancy between HAEs at z ∼ 2.3 and typical local star-forming galaxies observed in the Sloan Digital Sky Survey, suggesting the evolution of lower gas-phase metallicity (Z) and higher ionization parameters (U) with redshift. Notably, we have observed a significant number of low-mass HAEs exhibiting exceptionally high EW_{[O iii]}. Their galaxy properties are comparable to those of extreme objects, such as extreme O3 emitters and Lyα emitters at z ≃ 2–3. Considering that these characteristics may indicate potential strong Lyman continuum leakage, higher-redshift analogs of the low-mass HAEs could be significant contributors to the cosmic reionization. Further investigations of this particular population are required to gain a clearer understanding of galaxy evolution and cosmic reionization.
Enhanced star formation and metallicity deficit in the USS 1558−003 forming protocluster at z = 2.53

J. M. Pérez-Martínez, T. Kodama, Y. Koyama, R. Shimakawa, T. L. Suzuki, K. Daikuhara, K. Adachi, M. Onodera, I. Tanaka

Monthly Notices of the Royal Astronomical Society　527　(4)　10221-10238　2024/02/01

DOI： 10.1093/mnras/stad3805 　

ISSN： 0035-8711

eISSN： 1365-2966
New insights into the role of AGNs in forming the cluster red sequence

Rhythm Shimakawa, Jose Manuel Perez-Martínez, Yusei Koyama, Masayuki Tanaka, Ichi Tanaka, Tadayuki Kodama, Nina A. Hatch, Huub J.A. Röttgering, Helmut Dannerbauer, Jaron D. Kurk

Monthly Notices of the Royal Astronomical Society　528　(2)　3679-3695　2024/02/01

DOI： 10.1093/mnras/stae118 　

ISSN： 0035-8711

eISSN： 1365-2966
COALAS II. Extended molecular gas reservoirs are common in a distant, forming galaxy cluster

Z. Chen, H. Dannerbauer, M. D. Lehnert, B. H.C. Emonts, Q. Gu, J. R. Allison, J. B. Champagne, N. Hatch, B. Indermüehle, R. P. Norris, J. M. Pérez-Martínez, H. J.A. Röttgering, P. Serra, N. Seymour, R. Shimakawa, A. P. Thomson, C. M. Casey, C. De Breuck, G. Drouart, T. Kodama, Y. Koyama, C. D.P. Lagos, P. Macgregor, G. Miley, J. M. Rodríguez-Espinosa, M. Sánchez-Portal, B. Ziegler

Monthly Notices of the Royal Astronomical Society　527　(3)　8950-8972　2024/01/01

DOI： 10.1093/mnras/stad3128 　

ISSN： 0035-8711

eISSN： 1365-2966
Environmental Impacts on the Rest-frame UV Size and Morphology of Star-forming Galaxies at z ∼ 2

Abdurrahman Naufal, Yusei Koyama, Rhythm Shimakawa, Tadayuki Kodama

Astrophysical Journal　2　(170)　2023/12/01

DOI： 10.3847/1538-4357/acfb81 　

ISSN： 0004-637X

eISSN： 1538-4357
Radial and Local Density Dependence of Star Formation Properties in Galaxy Clusters from the Hyper Suprime-Cam Survey

Hung Yu Jian, Lihwai Lin, Bau Ching Hsieh, Keiichi Umetsu, Carlos Lopez-Coba, Masamune Oguri, Connor Bottrell, Yoshiki Toba, Yusei Koyama, Yu Yen Chang, Tadayuki Kodama, Yutaka Komiyama, Surhud More, Kai Yang Lin, Atsushi J. Nishizawa, Ichi Tanaka

Astrophysical Journal　957　(2)　2023/11/01

DOI： 10.3847/1538-4357/acfc22 　

ISSN： 0004-637X

eISSN： 1538-4357
An enhanced abundance of bright galaxies in protocluster candidates at z ∼ 3-5

Jun Toshikawa, Stijn Wuyts, Nobunari Kashikawa, Chengze Liu, Marcin Sawicki, Roderik Overzier, Mariko Kubo, Hisakazu Uchiyama, Kei Ito, Malcolm Bremer, Yoshiaki Ono, Tadayuki Kodama, Yen-Ting Lin, Tomoki Saito

Monthly Notices of the Royal Astronomical Society　2023/10/14

DOI： 10.1093/mnras/stad3162 　
A Multiwavelength Investigation of Dust and Stellar Mass Distributions in Galaxies: Insights from High-resolution JWST Imaging Peer-reviewed

Zhaoran Liu, Takahiro Morishita, Tadayuki Kodama

The Astrophysical Journal　955　(1)　29-29　2023/09/01
Publisher: American Astronomical Society
DOI： 10.3847/1538-4357/acef19 　

ISSN： 0004-637X

eISSN： 1538-4357

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Abstract We study the morphological properties of mid-infrared selected galaxies at 1.0 < z < 1.7 in the SMACS J0723.3-7327 cluster field to investigate the mechanisms of galaxy mass assembly and structural formation at cosmic noon. We develop a new algorithm to decompose the dust and stellar components of individual galaxies by using high-resolution images in the MIRI F770W and NIRCam F200W bands. Our analysis reveals that a significant number of galaxies with stellar masses between 10^9.5 < M_*/M_⊙ < 10^10.5 exhibit dust cores that are relatively more compact than their stellar cores. Specifically, within this mass range, the nonparametric method indicates that the dust cores are 1.23 (±0.05) times more compact than the stellar cores on average when evaluated with flux concentration of the two components within a fixed radius. Similarly, the parametric method yields an average compactness ratio of 1.27 (±0.06). Notably, the most massive galaxy (M_* ∼ 10^10.9M_⊙) in our sample demonstrates a comparable level of compactness between its stellar core and dust, with a dust-to-stellar ratio of 0.86 (0.89) as derived from nonparametric (parametric) method. The observed compactness of the dust component is potentially attributed to the presence of a (rapidly growing) massive bulge that in some cases is associated with elevated star formation. Expanding the sample size through a joint analysis of multiple Cycle 1 deep-imaging programs can help to confirm the inferred picture. Our pilot study highlights that MIRI offers an efficient approach to studying the structural formation of galaxies from cosmic noon to the modern Universe.
An ∼600 pc View of the Strongly Lensed, Massive Main-sequence Galaxy J0901: A Baryon-dominated, Thick Turbulent Rotating Disk with a Clumpy Cold Gas Ring at z = 2.259 Peer-reviewed

Daizhong Liu, N. M. Förster Schreiber, R. Genzel, D. Lutz, S. H. Price, L. L. Lee, Andrew J. Baker, A. Burkert, R. T. Coogan, R. I. Davies, R. L. Davies, R. Herrera-Camus, Tadayuki Kodama, Minju M. , Lee, A. Nestor, C. Pulsoni, A. Renzini, Chelsea E. Sharon, T. T. Shimizu, L. J. Tacconi, Ken-ichi Tadaki, H. Übler

The Astrophysical Journal　942　(2)　98-98　2023/01/01
Publisher: American Astronomical Society
DOI： 10.3847/1538-4357/aca46b 　

ISSN： 0004-637X

eISSN： 1538-4357

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Abstract We present a high-resolution kinematic study of the massive main-sequence star-forming galaxy (SFG) SDSS J090122.37+181432.3 (J0901) at z = 2.259, using ∼0.″36 Atacama Large Millimeter/submillimeter Array CO(3–2) and ∼0.″1–0.″5 SINFONI/VLT Hα observations. J0901 is a rare, strongly lensed but otherwise normal massive ($\mathrm{log}({M}_{\star }/{M}_{\odot })\sim 11$) main-sequence SFG, offering a unique opportunity to study a typical massive SFG under the microscope of lensing. Through forward dynamical modeling incorporating lensing deflection, we fit the CO and Hα kinematics in the image plane out to about one disk effective radius (R_e ∼ 4 kpc) at an ∼600 pc delensed physical resolution along the kinematic major axis. Our results show high intrinsic dispersions of the cold molecular and warm ionized gas (σ_0,mol. ∼ 40 km s⁻¹ and σ_0,ion. ∼ 66 km s⁻¹) that remain constant out to R_e; a moderately low dark matter fraction (f_DM ∼ 0.3–0.4) within R_e; and a centrally peaked Toomre Q parameter—agreeing well with the previously established σ₀ versus z, f_DM versus Σ_baryon, and Q's radial trends using large-sample non-lensed main-sequence SFGs. Our data further reveal a high stellar mass concentration within ∼1–2 kpc with little molecular gas, and a clumpy molecular gas ring-like structure at R ∼ 2–4 kpc, in line with the inside-out quenching scenario. Our further analysis indicates that J0901 had assembled half of its stellar mass only ∼400 Myr before its observed cosmic time, and the cold gas ring and dense central stellar component are consistent with signposts of a recent wet compaction event of a highly turbulent disk found in recent simulations.
CO(J = 1-0) Mapping Survey of 64 Galaxies in the Fornax Cluster with the ALMA Morita Array Peer-reviewed

Morokuma-Matsui, Kana, Bekki, Kenji, Wang, Jing, Serra, Paolo, Koyama, Yusei, Morokuma, Tomoki, Egusa, Fumi, For, Bi-Qing, Nakanishi, Kouichiro, Koribalski, Bärbel S., Okamoto, Takashi, Kodama, Tadayuki, Lee, Bumhyun, Maccagni, Filippo M., Miura, Rie E., Espada, Daniel, Takeuchi, Tsutomu T., Yang, Dong, Lee, Minju M., Ueda, Masaki, Matsushita, Kyoko

The Astrophysical Journal Supplement Series　2022/12

DOI： 10.3847/1538-4365/ac983b 　

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We conduct a ¹²C¹⁶O(J = 1-0) (hereafter CO) mapping survey of 64 galaxies in the Fornax cluster using the Atacama Large Millimeter/submillimeter Array Morita array in cycle 5. CO emission is detected from 23 out of the 64 galaxies. Our sample includes dwarf, spiral, and elliptical galaxies with stellar masses of M _star ~ 10^6.3-11.6 M _⊙. The achieved beam size and sensitivity are 15″ × 8″ and ~12 mJy beam^-1 at the velocity resolution of ~10 km s^-1, respectively. We study the cold gas (molecular and atomic gas) properties of 38 subsamples with M _star > 10⁹ M _⊙ combined with literature H I data. We find that (1) the low star formation (SF) activity in the Fornax galaxies is caused by the decrease in the cold gas mass fraction with respect to stellar mass (hereafter, gas fraction) rather than the decrease of the SF efficiency from the cold gas; (2) the atomic gas fraction is more heavily reduced than the molecular gas fraction of such galaxies with low SF activity. A comparison between the cold gas properties of the Fornax galaxies and their environmental properties suggests that the atomic gas is stripped tidally and by the ram pressure, which leads to the molecular gas depletion with an aid of the strangulation and consequently SF quenching. Preprocesses in the group environment would also play a role in reducing cold gas reservoirs in some Fornax galaxies....
Revealing impacts of stellar mass and environment on galaxy quenching Peer-reviewed

Zhiying Mao, Tadayuki Kodama, Jose Manuel Pérez-Martínez, Tomoko L. Suzuki, Naoaki Yamamoto, Kouta Adachi

Astronomy & Astrophysics　666　A141-A141　2022/10/18
Publisher: EDP Sciences
DOI： 10.1051/0004-6361/202243733 　

ISSN： 0004-6361

eISSN： 1432-0746

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Aims. Galaxy quenching is a critical step in galaxy evolution. In this work, we present a statistical study of galaxy quenching in 17 cluster candidates at 0.5 < z < 1.0 in the COSMOS field. Methods. We selected cluster members with a wide range of stellar masses and environments to study their mass and environment dependence. Member galaxies are classified into star-forming, quiescent, and recently quenched galaxies (RQGs) using the rest-frame UVJ diagram. We further separated fast- and slow-quenching RQGs by model evolutionary tracks on the UVJ diagram. We defined the quenching efficiency as the ratio of RQGs to star-forming galaxies and the quenching stage as the ratio of RQGs to quiescent galaxies to quantify the quenching processes. Results. We find that quenching efficiency is enhanced by both higher stellar mass and denser environment. Massive or dense environment galaxies quench earlier. Slow quenching is more dominant for massive galaxies and at lower redshifts, but no clear dependence on the environment is found. Our results suggest that low-mass galaxies in dense environments are likely quenched through a short timescale process such as ram pressure stripping, while massive galaxies in a sparse environment are mostly quenched by a longer timescale process. Using the line strength of Hδ and [OII], we confirmed that our UVJ method to select RQGs agrees with high S/N DEIMOS spectra. However, we caution that the visibility time (duration of a galaxy’s stay in the RQG region on the UVJ diagram) may also depend on mass or environment. The method introduced in this work can be applied to RQG candidates for future statistical RQG spectroscopic surveys. The systematic spectroscopic RQG study will disentangle the degeneracy between visibility time and quenching properties.
Signs of environmental effects on star-forming galaxies in the Spiderweb protocluster at z = 2.16 Peer-reviewed

J M Pérez-Martínez, H Dannerbauer, T Kodama, Y Koyama, R Shimakawa, T L Suzuki, R Calvi, Z Chen, K Daikuhara, N A Hatch, A Laza-Ramos, D Sobral, J P Stott, I Tanaka

Monthly Notices of the Royal Astronomical Society　518　(2)　1707-1734　2022/09/29
Publisher: Oxford University Press (OUP)
DOI： 10.1093/mnras/stac2784 　

ISSN： 0035-8711

eISSN： 1365-2966

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ABSTRACT We use multi-object near-infrared spectroscopy with VLT/KMOS to investigate the role of the environment in the evolution of the ionized gas properties of narrow-band-selected H α emitters (HAEs) in the Spiderweb protocluster at z = 2.16. Based on rest-frame optical emission lines, H α and [N ii]λ6584, we confirm the cluster membership of 39 of our targets (i.e. 93 per cent success rate), and measure their star formation rates (SFR), gas-phase oxygen abundances, and effective radius. We parametrize the environment where our targets reside using local and global density indicators based on previous samples of spectroscopic and narrow-band cluster members. We find that star-forming galaxies embedded in the Spiderweb protocluster display SFRs compatible with those of the main sequence and morphologies comparable to those of late-type galaxies at z = 2.2 in the field. We also report a mild gas-phase metallicity enhancement (0.06 ± 0.03 dex) at intermediate stellar masses. Furthermore, we identify two UVJ-selected quiescent galaxies with residual H α-based star formation and find signs of extreme dust obscuration in a small sample of starbursty submillimetre galaxies based on their FIR and H α emission. Interestingly, the spatial distribution of these objects differs from the rest of HAEs, avoiding the protocluster core. Finally, we explore the gas fraction–gas metallicity diagram for seven galaxies with molecular gas masses measured by ATCA using CO(1−0). In the context of the gas-regulator model, our objects are consistent with relatively low mass-loading factors, suggesting lower outflow activity than field samples at the cosmic noon and thus, hinting at the onset of environmental effects in this massive protocluster.
ULTIMATE-Subaru: GLAO preliminary design overview

Yosuke Minowa, Yoshito Ono, Yoko Tanaka, Hiroshige Yoshida, Koki Terao, Yusei Koyama, Sadman Ali, Ichi Tanaka, Takashi Hattori, Hirofumi Okita, Yutaka Hayano, Shin Oya, Kentaro Motohara, Kenshi Yanagisawa, Michitoshi Yoshida, Masayuki Akiyama, Tadayuki Kodama, Hajime Ogane, Masahiro Konishi, Noelia Martínez Rey, Nicholas Herrald, Céline d'Orgeville, François Rigaut, Israel Vaughn, David Chandler, Dionne Haynes, Warrick Schofield, Shiang-Yu Wang, Chi-Yi Chou, Masahiko Kimura

Adaptive Optics Systems VIII　2022/08/30
Publisher: SPIE
DOI： 10.1117/12.2629749 　
GREX-PLUS: galaxy reionization explorer and planetary universe spectrometer

Akio K. Inoue, Hidehiro Kaneda, Toru Yamada, Yuichi Harikane, Daisuke Ishihara, Tadayuki Kodama, Yutaka Komiyama, Takashi Moriya, Kentaro Motohara, Hideko Nomura, Masami Ouchi, Shinki Oyabu, Toyoaki Suzuki, Takehiko Wada, Issei Yamamura

Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave　2022/08/27
Publisher: SPIE
DOI： 10.1117/12.2626050 　
High-resolution ALMA Study of CO J = 2–1 Line and Dust Continuum Emissions in Cluster Galaxies at z = 1.46 Peer-reviewed

Ryota Ikeda, Ken-ichi Tadaki, Daisuke Iono, Tadayuki Kodama, Jeffrey C. C. Chan, Bunyo Hatsukade, Masao Hayashi, Takuma Izumi, Kotaro Kohno, Yusei Koyama, Rhythm Shimakawa, Tomoko L. Suzuki, Yoichi Tamura, Ichi Tanaka

The Astrophysical Journal　933　(1)　11-11　2022/07/01
Publisher: American Astronomical Society
DOI： 10.3847/1538-4357/ac6cdc 　

ISSN： 0004-637X

eISSN： 1538-4357

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Abstract We present new Atacama Large Millimeter/submillimeter Array (ALMA) results obtained from spatially resolved CO J = 2–1 line (0.″4 resolution) and 870 μm continuum (0.″2 resolution) observations of cluster galaxies in XMMXCS J2215.9-1738 at z = 1.46. Our sample comprises 17 galaxies within ∼0.5 Mpc (0.6R₂₀₀) of the cluster center, all of which have previously been detected in the CO J = 2–1 line at a lower resolution. The effective radii of both the CO J = 2–1 line and 870 μm dust continuum emissions are robustly measured for nine galaxies by modeling the visibilities. We find that the CO J = 2–1 line emission in all of the nine galaxies is more extended than the dust continuum emission by a factor of 2.8 ± 1.4. We investigate the spatially resolved Kennicutt–Schmidt (KS) relation in two regions within the interstellar medium of the galaxies. The relation for our sample reveals that the central region (0 < r < R_e,870μm) of galaxies tends to have a shorter gas depletion timescale, i.e., a higher star formation efficiency, compared to the extended region (R_e,870μm < r < R_e,CO). Overall, our result suggests that star formation activities are concentrated inside the extended gas reservoir, possibly resulting in the formation of a bulge structure. We find consistency between the ALMA 870 μm radii of star-forming members and the Hubble Space Telescope/1.6 μm radii of passive members in a mass–size distribution, which suggests a transition from star-forming to passive members within ∼0.5 Gyr. In addition, no clear differences in the KS relation nor in the sizes are found between galaxies with and without a close companion.
Third data release of the Hyper Suprime-Cam Subaru Strategic Program Peer-reviewed

Hiroaki Aihara, Yusra AlSayyad, Makoto Ando, Robert Armstrong, James Bosch, Eiichi Egami, Hisanori Furusawa, Junko Furusawa, Sumiko Harasawa, Yuichi Harikane, Bau-Ching Hsieh, Hiroyuki Ikeda, Kei Ito, Ikuru Iwata, Tadayuki Kodama, Michitaro Koike, Mitsuru Kokubo, Yutaka Komiyama, Xiangchong Li, Yongming Liang, Yen-Ting Lin, Robert H. Lupton, Nate B. Lust, Lauren A. MacArthur, Ken Mawatari, Sogo Mineo, Hironao Miyatake, Satoshi Miyazaki, Surhud More, Takahiro Morishima, Hitoshi Murayama, Kimihiko Nakajima, Fumiaki Nakata, Atsushi J. Nishizawa, Masamune Oguri, Nobuhiro Okabe, Yuki Okura, Yoshiaki Ono, Ken Osato, Masami Ouchi, Yen-Chen Pan, Andres A. Plazas Malagon, Paul A. Price, Sophie L. Reed, Eli S. Rykoff, Takatoshi Shibuya, Mirko Simunovic, Michael A. Strauss, Kanako Sugimori, Yasushi Suto, Nao Suzuki, Masahiro Takada, Yuhei Takagi, Tadafumi Takata, Satoshi Takita, Masayuki Tanaka, Shenli Tang, Dan S. Taranu, Tsuyoshi Terai, Yoshiki Toba, Edwin L. Turner, Hisakazu Uchiyama, Bovornpratch Vijarnwannaluk, Christopher Z. Waters, Yoshihiko Yamada, Naoaki Yamamoto, Takuji Yamashita

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN　74　(2)　247-272　2022/04

DOI： 10.1093/pasj/psab122 　

ISSN： 0004-6264

eISSN： 2053-051X
Do blue galaxy-clusters have hot intracluster gas? Peer-reviewed

Rana Misato, Yoshiki Toba, Naomi Ota, Naoaki Yamamoto, Tadayuki Kodama, Nobuhiro Okabe, Masamune Oguri, Ikuyuki Mitsuishi

Publications of the Astronomical Society of Japan　74　(2)　398-406　2022/03/02
Publisher: Oxford University Press ({OUP})
DOI： 10.1093/pasj/psac002 　

ISSN： 0004-6264

eISSN： 2053-051X
Star Formation Properties of Sloan Digital Sky Survey BOSS Void Galaxies in the Hyper Suprime-Cam Survey Peer-reviewed

Hung Yu Jian, Lihwai Lin, Bau Ching Hsieh, Kai Yang Lin, Keiichi Umetsu, Carlos Lopez-Coba, Yusei Koyama, Chin Hao Hsu, Yung Chau Su, Yu Yen Chang, Tadayuki Kodama, Yutaka Komiyama, Surhud More, Atsushi J. Nishizawa, Masamune Oguri, Ichi Tanaka

Astrophysical Journal　926　(2)　2022/02/01

DOI： 10.3847/1538-4357/ac448b 　

ISSN： 0004-637X

eISSN： 1538-4357
The Environmental Dependence of Gas Properties in Dense Cores of a Protocluster at z ∼ 2.5 Revealed with ALMA Peer-reviewed

Kohei Aoyama, Tadayuki Kodama, Tomoko L. Suzuki, Ken Ichi Tadaki, Rhythm Shimakawa, Masao Hayashi, Yusei Koyama, Jose Manuel Pérez-Martínez

Astrophysical Journal　924　(2)　2022/01/10

DOI： 10.3847/1538-4357/ac34fa 　

ISSN： 0004-637X

eISSN： 1538-4357
FOREVER22: galaxy formation in protocluster regions Peer-reviewed

Hidenobu Yajima, Makito Abe, Sadegh Khochfar, Kentaro Nagamine, Akio K Inoue, Tadayuki Kodama, Shohei Arata, Claudio Dalla Vecchia, Hajime Fukushima, Takuya Hashimoto, Nobunari Kashikawa, Mariko Kubo, Yuexing Li, Yuichi Matsuda, Ken Mawatari, Masami Ouchi, Hideki Umehata

Monthly Notices of the Royal Astronomical Society　509　(3)　4037-4057　2021/12/03
Publisher: Oxford University Press (OUP)
DOI： 10.1093/mnras/stab3092 　

ISSN： 0035-8711

eISSN： 1365-2966

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<title>ABSTRACT</title> We present results from a new cosmological hydrodynamics simulation campaign of protocluster (PC) regions, FOREVER22: FORmation and EVolution of galaxies in Extremely overdense Regions motivated by SSA22. The simulations cover a wide range of cosmological scales using three different zoom set-ups in a parent volume of $(714.2~\rm cMpc)^{3}$: PCR (Proto-Cluster Region; V = (28.6 cMpc)3, SPH particle mass, mSPH = 4.1 × 106 M⊙, and final redshift, zend = 2.0), BCG (Brightest proto-Cluster Galaxy; V ∼ (10 cMpc)3, mSPH = 5.0 × 105 M⊙ and zend = 4.0), and First (V ∼ (3 cMpc)3, mSPH = 7.9 × 103 M⊙ and zend = 9.5) runs, that allow us to focus on different aspects of galaxy formation. In the PCR runs, we follow 10 PCs, each harbouring 1–4 SMBHs with ${\rm M_{\rm BH } }\ge 10^{9}~{\rm M_{\odot } }$. One of the PC cores shows a spatially close arrangement of seven starburst galaxies with ${\rm SFR} \gtrsim 100~{\rm {\rm M_{\odot } }~{\rm yr^{-1 } } }$ each, that are dust-obscured and would appear as submillimetre galaxies with flux ≳1 mJy at $1.1~ \rm mm$ in observations. The BCG runs show that the total SFRs of haloes hosting BCGs are affected by AGN feedback, but exceed $1000~{\rm {\rm M_{\odot } }~{\rm yr^{-1 } } }$ at z ≲ 6. The First runs resolve mini-haloes hosting population (Pop) III stars and we show that, in PC regions, the dominant stellar population changes from Pop III to Pop II at z ≳ 20, and the first galaxies with ${\rm SFR} \gtrsim 18~{\rm {\rm M_{\odot } }~{\rm yr^{-1 } } }$ form at z ∼ 10. These can be prime targets for future observations with the James Webb Space Telescope. Our simulations successfully reproduce the global star formation activities in observed PCs and suggest that PCs can kickstart cosmic reionization.
COALAS. I. ATCA CO(1-0) survey and luminosity function in the Spiderweb protocluster at z = 2.16 Peer-reviewed

S. Jin, H. Dannerbauer, B. Emonts, P. Serra, C. D. P. Lagos, A. P. Thomson, L. Bassini, M. Lehnert, J. R. Allison, J. B. Champagne, B. Indermühle, R. P. Norris, N. Seymour, R. Shimakawa, C. M. Casey, C. De Breuck, G. Drouart, N. Hatch, T. Kodama, Y. Koyama, P. Macgregor, G. Miley, R. Overzier, J. M. Pérez-Martínez, J. M. Rodríguez-Espinosa, H. Röttgering, M. Sánchez Portal, B. Ziegler

Astronomy & Astrophysics　652　A11-A11　2021/08
Publisher: EDP Sciences
DOI： 10.1051/0004-6361/202040232 　

ISSN： 0004-6361

eISSN： 1432-0746

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We report a detailed CO(1−0) survey of a galaxy protocluster field at <italic>z</italic> = 2.16, based on 475 h of observations with the Australia Telescope Compact Array. We constructed a large mosaic of 13 individual pointings, covering an area of 21 arcmin² and ±6500 km s⁻¹ range in velocity. We obtained a robust sample of 46 CO(1−0) detections spanning <italic>z</italic> = 2.09 − 2.22, constituting the largest sample of molecular gas measurements in protoclusters to date. The CO emitters show an overdensity at <italic>z</italic> = 2.12 − 2.21, suggesting a galaxy super-protocluster or a protocluster connected to large-scale filaments of ∼120 cMpc in size. We find that 90% of CO emitters have distances >0.′5−4′ to the center galaxy, indicating that small area surveys would miss the majority of gas reservoirs in similar structures. Half of the CO emitters have velocities larger than escape velocities, which appears gravitationally unbound to the cluster core. These unbound sources are barely found within the <italic>R</italic>₂₀₀ radius around the center, which is consistent with a picture in which the cluster core is collapsed while outer regions are still in formation. Compared to other protoclusters, this structure contains a relatively higher number of CO emitters with relatively narrow line widths and high luminosities, indicating galaxy mergers. We used these CO emitters to place the first constraint on the CO luminosity function and molecular gas density in an overdense environment. The amplitude of the CO luminosity function is 1.6 ± 0.5 orders of magnitude higher than that observed for field galaxy samples at <italic>z</italic> ∼ 2, and one order of magnitude higher than predictions for galaxy protoclusters from semi-analytical SHARK models. We derive a high molecular gas density of 0.6 − 1.3 × 10⁹ <italic>M</italic>_⊙ cMpc⁻³ for this structure, which is consistent with predictions for cold gas density of massive structures from hydro-dynamical DIANOGA simulations.
COALAS Peer-reviewed

S. Jin, H. Dannerbauer, B. Emonts, P. Serra, C. D. P. Lagos, A. P. Thomson, L. Bassini, M. Lehnert, J. R. Allison, J. B. Champagne, B. Indermühle, R. P. Norris, N. Seymour, R. Shimakawa, C. M. Casey, C. De Breuck, G. Drouart, N. Hatch, T. Kodama, Y. Koyama, P. Macgregor, G. Miley, R. Overzier, J. M. Pérez-Martínez, J. M. Rodríguez-Espinosa, H. Röttgering, M. Sánchez Portal, B. Ziegler

Astronomy & Astrophysics　652　A11-A11　2021/08
Publisher: EDP Sciences
DOI： 10.1051/0004-6361/202040232 　

ISSN： 0004-6361

eISSN： 1432-0746

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We report a detailed CO(1−0) survey of a galaxy protocluster field at <italic>z</italic> = 2.16, based on 475 h of observations with the Australia Telescope Compact Array. We constructed a large mosaic of 13 individual pointings, covering an area of 21 arcmin² and ±6500 km s⁻¹ range in velocity. We obtained a robust sample of 46 CO(1−0) detections spanning <italic>z</italic> = 2.09 − 2.22, constituting the largest sample of molecular gas measurements in protoclusters to date. The CO emitters show an overdensity at <italic>z</italic> = 2.12 − 2.21, suggesting a galaxy super-protocluster or a protocluster connected to large-scale filaments of ∼120 cMpc in size. We find that 90% of CO emitters have distances >0.′5−4′ to the center galaxy, indicating that small area surveys would miss the majority of gas reservoirs in similar structures. Half of the CO emitters have velocities larger than escape velocities, which appears gravitationally unbound to the cluster core. These unbound sources are barely found within the <italic>R</italic>₂₀₀ radius around the center, which is consistent with a picture in which the cluster core is collapsed while outer regions are still in formation. Compared to other protoclusters, this structure contains a relatively higher number of CO emitters with relatively narrow line widths and high luminosities, indicating galaxy mergers. We used these CO emitters to place the first constraint on the CO luminosity function and molecular gas density in an overdense environment. The amplitude of the CO luminosity function is 1.6 ± 0.5 orders of magnitude higher than that observed for field galaxy samples at <italic>z</italic> ∼ 2, and one order of magnitude higher than predictions for galaxy protoclusters from semi-analytical SHARK models. We derive a high molecular gas density of 0.6 − 1.3 × 10⁹ <italic>M</italic>_⊙ cMpc⁻³ for this structure, which is consistent with predictions for cold gas density of massive structures from hydro-dynamical DIANOGA simulations.
Erratum: Extended star-forming region within galaxies in a dense proto-cluster core at z = 2.53 (Publications of the Astronomical Society of Japan (2019) 71 (69) DOI: 10.1093/pasj/psz047)

Tomoko L. Suzuki, Yosuke Minowa, Yusei Koyama, Tadayuki Kodama, Masao Hayashi, Rhythm Shimakawa, Ichi Tanaka, Ken-Ichi Tadaki

Publications of the Astronomical Society of Japan　73　(3)　773　2021/06/01
Publisher: Oxford University Press
DOI： 10.1093/pasj/psab045 　

ISSN： 2053-051X 0004-6264
A Phase-space View of Cold-gas Properties of Virgo Cluster Galaxies: Multiple Quenching Processes at Work? Peer-reviewed

Kana Morokuma-Matsui, Tadayuki Kodama, Tomoki Morokuma, Kouichiro Nakanishi, Yusei Koyama, Takuji Yamashita, Shuhei Koyama, Takashi Okamoto

The Astrophysical Journal　2021/06/01

DOI： 10.3847/1538-4357/abedb6 　
Subaru Hyper Suprime-Cam excavates colossal over- and underdense structures over 360 deg2 out to z = 1 Peer-reviewed

Rhythm Shimakawa, Yuichi Higuchi, Masato Shirasaki, Masayuki Tanaka, Yen-Ting Lin, Masao Hayashi, Rieko Momose, Chien-Hsiu Lee, Haruka Kusakabe, Tadayuki Kodama, Naoaki Yamamoto

Monthly Notices of the Royal Astronomical Society　503　(3)　3896-3912　2021/04/01
Publisher: Oxford University Press (OUP)
DOI： 10.1093/mnras/stab713 　

ISSN： 0035-8711

eISSN： 1365-2966

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<title>ABSTRACT</title> Subaru Strategic Program with the Hyper-Suprime Cam (HSC-SSP) has proven to be successful with its extremely wide area coverage in past years. Taking advantages of this feature, we report initial results from exploration and research of expansive over- and underdense structures at z = 0.3–1 based on the second Public Data Release where optical 5-band photometric data for ∼ eight million sources with i &lt; 23 mag are available over ∼360 deg2. We not only confirm known superclusters but also find candidates of titanic over- and underdense regions out to z = 1. The mock data analysis suggests that the density peaks would involve one or more massive dark matter haloes (&gt;1014 M⊙) of the redshift, and the density troughs tend to be empty of massive haloes over &gt;10 comoving Mpc. Besides, the density peaks and troughs at z ≲ 0.6 are in part identified as positive and negative weak lensing signals respectively, in mean tangential shear profiles, showing a good agreement with those inferred from the full-sky weak lensing simulation. The coming extensive spectroscopic surveys will be able to resolve these colossal structures in 3D space. The number density information over the entire survey field is available as grid-point data on the website of the HSC-SSP data release (https://hsc.mtk.nao.ac.jp/ssp/data-release/).
Revisited Cold Gas Content with Atomic Carbon [C i] in z = 2.5 Protocluster Galaxies Peer-reviewed

Minju M. Lee, Ichi Tanaka, Daisuke Iono, Ryohei Kawabe, Tadayuki Kodama, Kotaro Kohno, Toshiki Saito, Yoichi Tamura

The Astrophysical Journal　909　(2)　181-181　2021/03/01
Publisher: American Astronomical Society
DOI： 10.3847/1538-4357/abdbb5 　

ISSN： 0004-637X

eISSN： 1538-4357
Dust, Gas, and Metal Content in Star-forming Galaxies at z ∼ 3.3 Revealed with ALMA and Near-IR Spectroscopy Peer-reviewed

Tomoko L. Suzuki, Masato Onodera, Tadayuki Kodama, Emanuele Daddi, Masao Hayashi, Yusei Koyama, Rhythm Shimakawa, Ian Smail, David Sobral, Sandro Tacchella, Ichi Tanaka

The Astrophysical Journal　908　(1)　15-15　2021/02/01
Publisher: American Astronomical Society
DOI： 10.3847/1538-4357/abd4e7 　

ISSN： 0004-637X

eISSN： 1538-4357
The University of Tokyo Atacama Observatory 6.5m telescope : On-sky performance of the near-infrared instrument SWIMS on the Subaru telescope

Masahiro Konishi, Kentaro Motohara, Hidenori Takahashi, Natsuko M. Kato, Kosuke Kushibiki, Hiroki Nakamura, Nuo Chen, Tadayuki Kodama, Masao Hayashi, Ichi Tanaka, Ken-ichi Tadaki, Jun Toshikawa, Yusei Koyama, Rhytmh Shimakawa, Tomoko L. Suzuki, Tetsuro Asano, Hirofumi Okita, Shintaro Koshida, Ken Tateuchi, Soya Todo, Yutaka Kobayakawa, Yutaro Kitagawa, Hirofumi Ohashi, Yukihiro Kono, Yasunori Terao, Tsutomu Aoki, Kentaro Asano, Mamoru Doi, Bunyo Hatsukade, Takafumi Kamizuka, Kotaro Kohno, Takeo Minezaki, Takashi Miyata, Tomoki Morokuma, Mizuki Mumata, Shigeyuki Sako, Hiroaki Sameshima, Takao Soyano, Toshihiko Tanabe, Masuo Tanaka, Ken'ichi Tarusawa, Ryou Ohsawa, Kengo Tachibana, Tsubasa Michifuji, Yuzuru Yoshii

Ground-based and Airborne Instrumentation for Astronomy VIII　2020/12/13
Publisher: SPIE
DOI： 10.1117/12.2560422 　
ULTIMATE-Subaru: System performance modeling of GLAO and wide-field NIR instruments

Yosuke Minowa, Yusei Koyama, Kenshi Yanagisawa, Kentaro Motohara, Ichi Tanaka, Yoshito H. Ono, Takashi Hattori, Christophe S. Clergeon, Yutaka Hayano, Masayuki Akiyama, Tadayuki Kodama, Céline d'Orgeville, François Rigaut, Shiang-Yu Wang, Michitoshi Yoshida

Modeling, Systems Engineering, and Project Management for Astronomy IX　2020/12/13
Publisher: SPIE
DOI： 10.1117/12.2561950 　
Broadband Selection, Spectroscopic Identification, and Physical Properties of a Population of Extreme Emission-line Galaxies at 3 < z < 3.7 Peer-reviewed

Masato Onodera, Rhythm Shimakawa, Tomoko L. Suzuki, Ichi Tanaka, Yuichi Harikane, Masao Hayashi, Tadayuki Kodama, Yusei Koyama, Kimihiko Nakajima, Takatoshi Shibuya

The Astrophysical Journal　904　(2)　180-180　2020/12/03
Publisher: American Astronomical Society
DOI： 10.3847/1538-4357/abc174 　

eISSN： 1538-4357
CHORUS. I. Cosmic HydrOgen Reionization Unveiled with Subaru: Overview Peer-reviewed

Akio K Inoue, Satoshi Yamanaka, Masami Ouchi, Ikuru Iwata, Kazuhiro Shimasaku, Yoshiaki Taniguchi, Tohru Nagao, Nobunari Kashikawa, Yoshiaki Ono, Ken Mawatari, Takatoshi Shibuya, Masao Hayashi, Hiroyuki Ikeda, Haibin Zhang, Yongming Liang, Chien-Hsiu Lee, Miftahul Hilmi, Satoshi Kikuta, Haruka Kusakabe, Hisanori Furusawa, Tomoki Hayashino, Masaru Kajisawa, Yuichi Matsuda, Kimihiko Nakajima, Rieko Momose, Yuichi Harikane, Tomoki Saito, Tadayuki Kodama, Shotaro Kikuchihara, Masanori Iye, Tomotsugu Goto

Publications of the Astronomical Society of Japan　72　(6)　2020/11/06
Publisher: Oxford University Press (OUP)
DOI： 10.1093/pasj/psaa100 　

ISSN： 0004-6264

eISSN： 2053-051X

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<title>Abstract</title> To determine the dominant sources for cosmic reionization, the evolution history of the global ionizing fraction, and the topology of the ionized regions, we have conducted a deep imaging survey using four narrow-band (NB) and one intermediate-band (IB) filters on the Subaru/Hyper Suprime-Cam (HSC), called Cosmic HydrOgen Reionization Unveiled with Subaru (CHORUS). The central wavelengths and full-widths-at-half-maximum of the CHORUS filters are, respectively, 386.2 nm and 5.5 nm for NB387, 526.0 nm and 7.9 nm for NB527, 717.1 nm and 11.1 nm for NB718, 946.2 nm and 33.0 nm for IB945, and 971.2 nm and 11.2 nm for NB973. This combination, including NB921 (921.5 nm and 13.5 nm) from the Subaru Strategic Program with HSC (HSC SSP), is carefully designed, as if they were playing a chorus, to observe multiple spectral features simultaneously, such as Lyman continuum, Lyα, C iv, and He ii for $z$ = 2–7. The observing field is the same as that of the deepest footprint of the HSC SSP in the COSMOS field and its effective area is about 1.6 deg2. We present an overview of the CHORUS project, which includes descriptions of the filter design philosophy, observations and data reduction, multiband photometric catalogs, assessments of the imaging quality, measurements of the number counts, and example use cases for the data. All the imaging data, photometric catalogs, masked pixel images, data of limiting magnitudes and point spread functions, results of completeness simulations, and source number counts are publicly available through the HSC SSP database.
Structural Evolution in Massive Galaxies at z ∼ 2 Peer-reviewed

Ken-ichi Tadaki, Sirio Belli, Andreas Burkert, Avishai Dekel, Natascha M. Förster Schreiber, Reinhard Genzel, Masao Hayashi, Rodrigo Herrera-Camus, Tadayuki Kodama, Kotaro Kohno, Yusei Koyama, Minju M. Lee, Dieter Lutz, Lamiya Mowla, Erica J. Nelson, Alvio Renzini, Tomoko L. Suzuki, Linda J. Tacconi, Hannah Übler, Emily Wisnioski, Stijn Wuyts

The Astrophysical Journal　901　(1)　74-74　2020/09/23
Publisher: American Astronomical Society
DOI： 10.3847/1538-4357/abaf4a 　

eISSN： 1538-4357
Environmental Impact on Star-forming Galaxies in a z ∼ 0.9 Cluster during the Course of Galaxy Accretion Peer-reviewed

Tetsuro Asano, Tadayuki Kodama, Kentaro Motohara, Lori Lubin, Brian C. Lemaux, Roy Gal, Adam Tomczak, Dale Kocevski, Masao Hayashi, Yusei Koyama, Ichi Tanaka, Tomoko L. Suzuki, Naoaki Yamamoto, Daiki Kimura, Masahiro Konishi, Hidenori Takahashi, Yasunori Terao, Kosuke Kushibiki, Yukihiro Kono, Yuzuru Yoshii

The Astrophysical Journal　899　(1)　64-64　2020/08/12
Publisher: American Astronomical Society
DOI： 10.3847/1538-4357/ab9dfb 　

eISSN： 1538-4357
ALMA twenty-six arcmin2 survey of GOODS-S at one millimeter (ASAGAO): Millimeter properties of stellar mass selected galaxies Peer-reviewed

Yuki Yamaguchi, Kotaro Kohno, Bunyo Hatsukade, Tao Wang, Yuki Yoshimura, Yiping Ao, James S Dunlop, Eiichi Egami, Daniel Espada, Seiji Fujimoto, Natsuki H Hayatsu, Rob J Ivison, Tadayuki Kodama, Haruka Kusakabe, Tohru Nagao, Masami Ouchi, Wiphu Rujopakarn, Ken-ichi Tadaki, Yoichi Tamura, Yoshihiro Ueda, Hideki Umehata, Wei-Hao Wang

Publications of the Astronomical Society of Japan　72　(4)　2020/08/01
Publisher: Oxford University Press (OUP)
DOI： 10.1093/pasj/psaa057 　

ISSN： 0004-6264

eISSN： 2053-051X
Implications of the mild gas motion found with Hitomi in the core of the Perseus cluster Peer-reviewed

Liyi Gu, Kazuo Makishima, Ryoji Matsumoto, Kazuhiro Nakazawa, Kazuhiro Shimasaku, Naohisa Inada, Tadayuki Kodama, Haiguang Xu, Madoka Kawaharada

Astronomy & Astrophysics　638　A138-A138　2020/06
Publisher: EDP Sciences
DOI： 10.1051/0004-6361/201936437 　

ISSN： 0004-6361

eISSN： 1432-0746

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Based mainly on X-ray observations, we study the interactions between the intracluster medium (ICM) in clusters of galaxies and their member galaxies. Through (magneto)hydrodynamic and gravitational channels, moving galaxies are expected to drag the ICM around them, and then transfer some fraction of their dynamical energies on cosmological timescales to the ICM. This hypothesis is in line with several observations, including the possible cosmological infall of galaxies toward the cluster center, found over redshifts of <italic>z</italic> ∼ 1 to <italic>z</italic> ∼ 0. Further assuming that the energy lost by these galaxies is first converted into ICM turbulence and then dissipated, this picture can explain the subsonic and uniform ICM turbulence, measured with <italic>Hitomi</italic> in the core region of the Perseus cluster. The scenario may also explain several other unanswered problems regarding clusters of galaxies, such as what prevents the ICM from underoing the expected radiative cooling, how the various mass components in nearby clusters have attained different radial distributions, and how a thermal stability is realized between hot and cool ICM components that co-exist around cD galaxies. This view is also considered to pertain to the general scenario of galaxy evolution, including their environmental effects.
Redshift Evolution of Green Valley Galaxies in Different Environments from the Hyper Suprime-Cam Survey Peer-reviewed

Hung-Yu Jian, Lihwai Lin, Yusei Koyama, Ichi Tanaka, Keiichi Umetsu, Bau-Ching Hsieh, Yuichi Higuchi, Masamune Oguri, Surhud More, Yutaka Komiyama, Tadayuki Kodama, Atsushi J. Nishizawa, Yu-Yen Chang

The Astrophysical Journal　894　(2)　125-125　2020/05/14
Publisher: American Astronomical Society
DOI： 10.3847/1538-4357/ab86a8 　

eISSN： 1538-4357
ULTIMATE-Subaru: enhancing the Subaru's wide-field capability with GLAO Peer-reviewed

Yosuke Minowa, Yusei Koyama, Yoshito H. Ono, Ichi Tanaka, Takashi Hattori, Christophe S. Clergeon, Masayuki Akiyama, Tadayuki Kodama, Kentaro Motohara, Francois Rigaut, Celine d'Orgeville, Shiang-Yu Wang, Michitoshi Yoshida

Advances in Optical Astronomical Instrumentation 2019　2020/01/03
Publisher: SPIE
DOI： 10.1117/12.2560539 　
Kinematics of disk galaxies in (proto-)clusters at z = 1.5 Peer-reviewed

A. Böhm, B. L. Ziegler, J. M. Pérez-Martínez, T. Kodama, M. Hayashi, C. Maier, M. Verdugo, Y. Koyama

Astronomy & Astrophysics　633　A131-A131　2020/01
Publisher: EDP Sciences
DOI： 10.1051/0004-6361/201935527 　

ISSN： 0004-6361

eISSN： 1432-0746

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<italic>Aims.</italic> While many aspects of the impact of dense environments on late-type galaxies at redshifts below unity have been scrutinized in the past few decades, observational studies of the interplay between environment and disk galaxy evolution at <italic>z</italic> > 1 are still scarce. We observed star-forming galaxies at <italic>z</italic> ≈ 1.5 selected from the HyperSuprimeCam Subaru Strategic Program. The galaxies are part of two significant overdensities of [O II] emitters identified via narrowband imaging and photometric redshifts from <italic>g</italic><italic>r</italic><italic>i</italic><italic>z</italic><italic>y</italic> photometry. <italic>Methods.</italic> We used the <italic>K</italic>-band Multi-Object Spectrograph (KMOS) to carry out H<italic>α</italic> integral field spectroscopy of 46 galaxies in total. Ionized gas maps, star formation rates, and velocity fields were derived from the H<italic>α</italic> emission line. We quantified morphological and kinematical asymmetries in order to look for potential gravitational (e.g., galaxy-galaxy) or hydrodynamical (e.g., ram-pressure) interactions. <italic>Results.</italic> H<italic>α</italic> emission was detected in 36 of our targets. Of these galaxies, 34 are members of two (proto-)clusters at <italic>z</italic> = 1.47, confirming our selection strategy to be highly efficient. By fitting model velocity fields to the observed ones, we determined the intrinsic maximum rotation velocity <italic>V</italic>_max of 14 galaxies. Utilizing the luminosity–velocity (Tully–Fisher) relation, we find that these galaxies are more luminous than their local counterparts of similar mass by up to ∼4 mag in the rest-frame <italic>B</italic>-band. In contrast to field galaxies at <italic>z</italic> < 1, the offsets of the <italic>z</italic> ≈ 1.5 (proto-)cluster galaxies from the local Tully–Fisher relation are not correlated with their star formation rates but with the ratio between <italic>V</italic>_max and gas velocity dispersion <italic>σ</italic>_g. This probably reflects that fewer disks have settled to purely rotational kinematics and high <italic>V</italic>_max/<italic>σ</italic>_g ratios, as is observed in the field at similar redshifts. Tests with degraded low-redshift cluster galaxy data show that we cannot identify purely hydrodynamical interactions with the imaging currently at hand. Due to relatively low galaxy velocity dispersions (<italic>σ</italic>_{<italic>v</italic>} < 400 km s⁻¹) of the (proto-)clusters, gravitational interactions are likely more efficient, resulting in higher kinematical asymmetries than in present-days clusters.
The whole picture of the large-scale structure of the CL1604 supercluster at z ∼ 0.9 Peer-reviewed

Masao Hayashi, Yusei Koyama, Tadayuki Kodama, Yutaka Komiyama, Yen-Ting Lin, Satoshi Miyazaki, Rhythm Shimakawa, Tomoko L Suzuki, Ichi Tanaka, Moegi Yamamoto, Naoaki Yamamoto

Publications of the Astronomical Society of Japan　71　(6)　2019/12/01
Publisher: Oxford University Press (OUP)
DOI： 10.1093/pasj/psz097 　

ISSN： 0004-6264

eISSN： 2053-051X

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<title>Abstract</title> We present the large-scale structure over a more than 50 comoving Mpc scale at $z \sim 0.9$ where the CL1604 supercluster, which is one of the largest structures ever known at high redshifts, is embedded. The wide-field deep imaging survey by the Subaru Strategic Program with the Hyper Suprime-Cam reveals that the already-known CL1604 supercluster is a mere part of larger-scale structure extending to both the north and the south. We confirm that there are galaxy clusters at three slightly different redshifts in the northern and southern sides of the supercluster by determining the redshifts of 55 red-sequence galaxies and 82 star-forming galaxies in total via follow-up spectroscopy with Subaru/FOCAS and Gemini-N/GMOS. This suggests that the structure known as the CL1604 supercluster is the tip of the iceberg. We investigate the stellar population of the red-sequence galaxies using 4000 Å break and Balmer H$\delta$ absorption lines. Almost all of the red-sequence galaxies brighter than $21.5\:$mag in the z band show an old stellar population of $\gtrsim\! 2\:$Gyr. The comparison of composite spectra of the red-sequence galaxies in the individual clusters show that the galaxies at a similar redshift have a similar stellar population age, even if they are located $\sim\! 50\:$Mpc apart from each other. However, there could be a large variation in the star formation history. Therefore, it is likely that galaxies associated with the large-scale structure on a 50 Mpc scale formed at almost the same time, have assembled into the denser regions, and then have evolved with different star formation history along the hierarchical growth of the cosmic web.
Planck far-infrared detection of Hyper Suprime-Cam protoclusters at $\bf z\sim4$: hidden AGN and star formation activity Peer-reviewed

Mariko Kubo, Jun Toshikawa, Nobunari Kashikawa, Yi-Kuan Chiang, Roderik Overzier, Hisakazu Uchiyama, David L. Clements, David M. Alexander, Yuichi Matsuda, Tadayuki Kodama, Yoshiaki Ono, Tomotsugu Goto, Tai-An Cheng, Kei Ito

The Astrophysical Journal　2019/11/21

DOI： 10.3847/1538-4357/ab5a80 　

ISSN： 1538-4357

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We perform a stacking analysis of {\it Planck}, {\it AKARI}, Infrared Astronomical Satellite ($IRAS$), Wide-field Infrared Survey Eplorer ($WISE$), and {\it Herschel} images of the largest number of (candidate) protoclusters at $z\sim3.8$ selected from the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP). Stacking the images of the $179$ candidate protoclusters, the combined infrared (IR) emission of the protocluster galaxies in the observed $12-850~\mu$m wavelength range is successfully detected with $>5\sigma$ significance (at $Planck$). This is the first time that the average IR spectral energy distribution (SED) of a protocluster has been constrained at $z\sim4$. The observed IR SEDs of the protoclusters exhibit significant excess emission in the mid-IR compared to that expected from typical star-forming galaxies (SFGs). They are reproduced well using SED models of intense starburst galaxies with warm/hot dust heated by young stars, or by a population of active galactic nuclei (AGN)/SFG composites. For the pure star-forming model, a total IR (from 8 to 1000 $\mu$m) luminosity of $19.3_{-4.2}^{+0.6}\times10^{13}~L_{\odot}$ and a star formation rate (SFR) of $16.3_{-7.8}^{+1.0}\times10^3~M_{\odot}$ yr$^{-1}$ are found whereas for the AGN/SFG composite model, $5.1_{-2.5}^{+2.5}\times10^{13}~L_{\odot}$ and $2.1^{+6.3}_{-1.7}\times10^3~M_{\odot}$ yr$^{-1}$ are found. Uncertainty remaining in the total SFRs; however, the IR luminosities of the most massive protoclusters are likely to continue increasing up to $z\sim4$. Meanwhile, no significant IR flux excess is observed around optically selected QSOs at similar redshifts, which confirms previous results. Our results suggest that the $z\sim4$ protoclusters trace dense, intensely star-forming environments that may also host obscured AGNs missed by the selection in the optical.
A Radio-to-millimeter Census of Star-forming Galaxies in Protocluster 4C 23.56 atz= 2.5: Global and Local Gas Kinematics Peer-reviewed

Minju M. Lee, Ichi Tanaka, Ryohei Kawabe, Itziar Aretxaga, Bunyo Hatsukade, Takuma Izumi, Masaru Kajisawa, Tadayuki Kodama, Kotaro Kohno, Kouichiro Nakanishi, Toshiki Saito, Ken-ichi Tadaki, Yoichi Tamura, Hideki Umehata, Milagros Zeballos

The Astrophysical Journal　883　(1)　92-92　2019/09/24

DOI： 10.3847/1538-4357/ab3b5b 　

ISSN： 0004-637X

eISSN： 1538-4357
Extended star-forming regions within galaxies in a dense proto-cluster core at z = 2.53† Peer-reviewed

Tomoko L Suzuki, Yosuke Minowa, Yusei Koyama, Tadayuki Kodama, Masao Hayashi, Rhythm Shimakawa, Ichi Tanaka, Ken-ichi Tadaki

Publications of the Astronomical Society of Japan　71　(4)　2019/08/01

DOI： 10.1093/pasj/psz047 　

ISSN： 0004-6264

eISSN： 2053-051X
A Spectroscopic Study of a Rich Cluster at z = 1.52 with Subaru and LBT: The Environmental Impacts on the Mass–Metallicity Relation Peer-reviewed

Shigeru V. Namiki, Yusei Koyama, Masao Hayashi, Ken-ichi Tadaki, Nobunari Kashikawa, Masato Onodera, Rhythm Shimakawa, Tadayuki Kodama, Ichi Tanaka, N. M. Förster Schreiber, Jaron Kurk, R. Genzel

The Astrophysical Journal　877　(2)　118-118　2019/06/03
Publisher: American Astronomical Society
DOI： 10.3847/1538-4357/ab1b6c 　

ISSN： 1538-4357

eISSN： 1538-4357
Cluster induced quenching of galaxies in the massive cluster XMMXCS J2215.9−1738 at z ∼ 1.5 traced by enhanced metallicities inside half R200 Peer-reviewed

C. Maier, M. Hayashi, B. L. Ziegler, T. Kodama

Astronomy & Astrophysics　626　A14-A14　2019/06
Publisher: EDP Sciences
DOI： 10.1051/0004-6361/201935522 　

ISSN： 0004-6361

eISSN： 1432-0746

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<italic>Aims</italic>. Cluster environments at <italic>z</italic> < 0.5 were found to increase the gas metallicities of galaxies which enter inner regions of the clusters where the density of the intracluster medium is high enough to remove their hot halo gas by ram-pressure stripping effects and to stop the inflow of pristine gas. To extend these studies to <italic>z</italic> > 1, the most massive clusters known at these redshifts are the sites where these environmental effects should be more pronounced and more easily observed with present day telescopes. <italic>Methods</italic>. We explore the massive cluster XMMXCS J2215.9−1738 at <italic>z</italic> ∼ 1.5 with KMOS spectroscopy of H<italic>α</italic> and [N II] <italic>λ</italic> 6584 covering a region that corresponds to about one virial radius. Using published spectroscopic redshifts of 108 galaxies in and around the cluster we computed the location of galaxies in the projected velocity-versus-position phase-space to separate our cluster sample into a virialized region of objects accreted longer ago (roughly inside half <italic>R</italic>₂₀₀) and a region of infalling galaxies. We measured oxygen abundances for ten cluster galaxies with detected [N II] <italic>λ</italic> 6584 lines in the individual galaxy spectra and compared the mass–metallicity relation of the galaxies inside half <italic>R</italic>₂₀₀ with the infalling galaxies and a field sample at similar redshifts. <italic>Results</italic>. We find that the oxygen abundances of individual <italic>z</italic> ∼ 1.5 star-forming cluster galaxies inside half <italic>R</italic>₂₀₀ are comparable, at the respective stellar mass, to the higher local SDSS metallicity values. We compare our measurements with a field galaxy sample from the KMOS3D survey at similar redshifts. We find that the [N II] <italic>λ</italic> 6584/H<italic>α</italic> line ratios inside half <italic>R</italic>₂₀₀ are higher by 0.2 dex and that the resultant metallicities of the galaxies in the inner part of the cluster are higher by about 0.1 dex, at a given mass, than the metallicities of infalling galaxies and of field galaxies at <italic>z</italic> ∼ 1.5. The enhanced metallicities of cluster galaxies at <italic>z</italic> ∼ 1.5 inside 0.5<italic>R</italic>₂₀₀ indicate that the density of the intracluster medium in this massive cluster becomes high enough toward the cluster center such that the ram pressure exceeds the restoring pressure of the hot gas reservoir of cluster galaxies. This can remove the gas reservoir and initiate quenching; although the galaxies continue to form stars, albeit at slightly lower rates, using the available cold gas in the disk which is not stripped.
ALMA twenty-six arcmin2 survey of GOODS-S at one millimeter (ASAGAO)

B. Hatsukade, K. Kohno, Y. Yamaguchi, H. Umehata, Y. Ao, I. Aretxaga, K. I. Caputi, J. S. Dunlop, E. Egami, D. Espada, S. Fujimoto, N. Hayatsu, D. H. Hughes, S. Ikarashi, D. Iono, R. J. Ivison, R. Kawabe, T. Kodama, M. Lee, Y. Matsuda, K. Nakanishi, K. Ohta, M. Ouchi, W. Rujopakarn, T. Suzuki, Y. Tamura, Y. Ueda, T. Wang, W.-H. Wang, G. W. Wilson, Y. Yoshimura, M. S. Yun

Proceedings of the International Astronomical Union　15　(S352)　239-240　2019/06
Publisher: Cambridge University Press (CUP)
DOI： 10.1017/s1743921319009542 　

ISSN： 1743-9213

eISSN： 1743-9221

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<title>Abstract</title>The ALMA twenty-six arcmin² survey of GOODS-S at one millimeter (ASAGAO) is a deep (1<italic>σ</italic> ∼ 61<italic>μ</italic>Jy/beam) and wide area (26 arcmin²) survey on a contiguous field at 1.2 mm. By combining with archival data, we obtained a deeper map in the same region (1<italic>σ</italic> ∼ 30<italic>μ</italic>Jy/beam⁻¹, synthesized beam size 0.59″ × 0.53″), providing the largest sample of sources (25 sources at 5<italic>σ</italic>, 45 sources at 4.5<italic>σ</italic>) among ALMA blank-field surveys. The median redshift of the 4.5<italic>σ</italic> sources is 2.4. The number counts shows that 52% of the extragalactic background light at 1.2 mm is resolved into discrete sources. We create IR luminosity functions (LFs) at <italic>z</italic> = 1–3, and constrain the faintest luminosity of the LF at 2 < <italic>z</italic> < 3. The LFs are consistent with previous results based on other ALMA and SCUBA-2 observations, which suggests a positive luminosity evolution and negative density evolution.
A Spectroscopic Study of a Rich Cluster at z=1.52 with Subaru and LBT: The Environmental Impacts on the Mass-Metallicity Relation Peer-reviewed

Namiki Shigeru V, Koyama Yusei, Hayashi Masao, Tadaki Ken-ichi, Kashikawa Nobunari, Onodera Masato, Shimakawa Rhythm, Kodama Tadayuki, Tanaka Ichi, Schreiber N. M. Forster, Kurk Jaron, Genzel R

ASTROPHYSICAL JOURNAL　877　(2)　118-118　2019/06/01

DOI： 10.3847/1538-4357/ab1b6c 　

ISSN： 0004-637X

eISSN： 1538-4357
Do Galaxy Morphologies Really Affect the Efficiency of Star Formation During the Phase of Galaxy Transition? Peer-reviewed

Shuhei Koyama, Yusei Koyama, Takuji Yamashita, Masao Hayashi, Hideo Matsuhara, Takao Nakagawa, Shigeru V. Namiki, Tomoko L. Suzuki, Nao Fukagawa, Tadayuki Kodama, Lihwai Lin, Kana Morokuma-Matsui, Rhythm Shimakawa, Ichi Tanaka

The Astrophysical Journal　874　(2)　142-142　2019/04/02

DOI： 10.3847/1538-4357/ab0e75 　

ISSN： 0004-637X

eISSN： 1538-4357
Environmental impacts on molecular gas in protocluster galaxies at z ∼ 2 Peer-reviewed

Ken-ichi Tadaki, Tadayuki Kodama, Masao Hayashi, Rhythm Shimakawa, Yusei Koyama, Minju Lee, Ichi Tanaka, Bunyo Hatsukade, Daisuke Iono, Kotaro Kohno, Yuichi Matsuda, Tomoko L Suzuki, Yoichi Tamura, Jun Toshikawa, Hideki Umehata

Publications of the Astronomical Society of Japan　71　(2)　2019/04/01

DOI： 10.1093/pasj/psz005 　

ISSN： 0004-6264

eISSN： 2053-051X
The Fraction of Active Galactic Nuclei in the USS 1558-003 Protocluster at z=2.53 Peer-reviewed

Macuga Michael, Martini Paul, Miller Eric D, Brodwin Mark, Hayashi Masao, Kodama Tadayuki, Koyama Yusei, Overzier Roderik A, Shimakawa Rhythm, Tadaki Ken-ichi, Tanaka Ichi

ASTROPHYSICAL JOURNAL　874　(1)　2019/03/20

DOI： 10.3847/1538-4357/ab0746 　

ISSN： 0004-637X
ALMA twenty-six arcmin$^2$ survey of GOODS-S at one-millimeter (ASAGAO): Near-infrared-dark faint ALMA sources Peer-reviewed

Yuki Yamaguchi, Kotaro Kohno, Bunyo Hatsukade, Tao Wang, Yuki Yoshimura, Yiping Ao, Karina I. Caputi, James S. Dunlop, Eiichi Egami, Daniel Espada, Seiji Fujimoto, Natsuki H. Hayatsu, Rob J. Ivison, Tadayuki Kodama, Haruka Kusakabe, Tohru Nagao, Masami Ouchi, Wiphu Rujopakarn, Ken-ichi Tadaki, Yoichi Tamura, Yoshihiro Ueda, Hideki Umehata, Wei-Hao Wang, Min S. Yun

Publications of the Astronomical Society of Japan　70　(6)　2019/03/07

DOI： 10.3847/1538-4357/ab0d22 　

ISSN： 0004-6264
ALMA twenty-six arcmin$^2$ survey of GOODS-S at one-millimeter (ASAGAO): Near-infrared-dark faint ALMA sources Peer-reviewed

Yuki Yamaguchi, Kotaro Kohno, Bunyo Hatsukade, Tao Wang, Yuki Yoshimura, Yiping Ao, Karina I. Caputi, James S. Dunlop, Eiichi Egami, Daniel Espada, Seiji Fujimoto, Natsuki H. Hayatsu, Rob J. Ivison, Tadayuki Kodama, Haruka Kusakabe, Tohru Nagao, Masami Ouchi, Wiphu Rujopakarn, Ken-ichi Tadaki, Yoichi Tamura, Yoshihiro Ueda, Hideki Umehata, Wei-Hao Wang, Min S. Yun

ASTROPHYSICAL JOURNAL　878　(1)　2019/03/07

DOI： 10.3847/1538-4357/ab0d22 　

ISSN： 0004-637X
On the different levels of dust attenuation to nebular and stellar light in star-forming galaxies Peer-reviewed

Koyama,_Yusei, Shimakawa,_Rhythm, Yamamura,_Issei, Kodama,_Tadayuki, Hayashi,_Masao

Publications of the Astronomical Society of Japan　71　(1)　2019/01

DOI： 10.1093/pasj/psy113 　

ISSN： 0004-6264

eISSN： 2053-051X
ALMA twenty-six arcmin² survey of GOODS-S at one millimeter (ASAGAO): Source catalog and number counts Peer-reviewed

Hatsukade, Bunyo, Kohno, Kotaro, Yamaguchi, Yuki, Umehata, Hideki, Ao, Yiping, Aretxaga, Itziar, Caputi, Karina I., Dunlop, James S., Egami, Eiichi, Espada, Daniel, Fujimoto, Seiji, Hayatsu, Natsuki H., Hughes, David H., Ikarashi, Soh, Iono, Daisuke, Ivison, Rob J., Kawabe, Ryohei, Kodama, Tadayuki, Lee, Minju, Matsuda, Yuichi, Nakanishi, Kouichiro, Ohta, Kouji, Ouchi, Masami, Rujopakarn, Wiphu, Suzuki, Tomoko, Tamura, Yoichi, Ueda, Yoshihiro, Wang, Tao, Wang, Wei-Hao, Wilson, Grant W., Yoshimura, Yuki, Yun, Min S.

Publications of the Astronomical Society of Japan　2018/12

DOI： 10.1093/pasj/psy104 　

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We present the survey design, data reduction, construction of images, and source catalog of the Atacama Large Millimeter/submillimeter Array (ALMA) twenty-six arcmin² survey of GOODS-S at one millimeter (ASAGAO). ASAGAO is a deep (1 σ depth ̃ 61 μJy beam^-1 for a 250 kλ-tapered map with a synthesized beam size of 0{^''_.}51 × 0{^''_.}45) and wide area (26 arcmin²) survey on a contiguous field at 1.2 mm. By combining with ALMA archival data in the GOODS-South field, we obtained a deeper map in the same region (1 σ depth ̃ 30 μJy beam^-1 for a deep region with a 250 kλ-taper, and a synthesized beam size of 0{^''_.}59 × 0{^''_.}53), providing the largest sample of sources (25 sources at ≥5.0 σ, 45 sources at ≥4.5 σ) among ALMA blank-field surveys to date. The number counts show that 52^{+11}_{-8}% of the extragalactic background light at 1.2 mm is resolved into discrete sources at S_{1.2 mm} > 135 μJy. We create infrared (IR) luminosity functions (LFs) in the redshift range of z = 1-3 from the ASAGAO sources with K_s-band counterparts, and constrain the faintest luminosity of the LF at 2.0 < z < 3.0. The LFs are consistent with previous results based on other ALMA and SCUBA-2 observations, which suggest a positive luminosity evolution and negative density evolution with increasing redshift. We find that obscured star-formation of sources with IR luminosities of log (L_IR/L_☉) ≳ 11.8 account for ≈60%-90% of the z ̃ 2 cosmic star-formation rate density....
MAHALO Deep Cluster Survey II. Characterizing massive forming galaxies in the Spiderweb protocluster at z = 2.2 Peer-reviewed

Shimakawa,_Rhythm, Koyama,_Yusei, R_ttgering,_Huub_J._A, Kodama,_Tadayuki, Hayashi,_Masao, Hatch,_Nina_A, Dannerbauer,_Helmut, Tanaka,_Ichi, Tadaki,_Ken-ichi, Suzuki,_Tomoko_L, Fukagawa,_Nao, Cai,_Zheng, Kurk,_Jaron_D

Monthly Notices of the Royal Astronomical Society　481　(4)　5630-5650　2018/12

DOI： 10.1093/mnras/sty2618 　

ISSN： 0035-8711

eISSN： 1365-2966
Revealing the Environmental Dependence of Molecular Gas Content in a Distant X-Ray Cluster at z_=_2.51 Peer-reviewed

Wang,_Tao, Elbaz,_David, Daddi,_Emanuele, Liu,_Daizhong, Kodama,_Tadayuki, Tanaka,_Ichi, Schreiber,_Corentin, Zanella,_Anita, Valentino,_Francesco, Sargent,_Mark, Kohno,_Kotaro, Xiao,_Mengyuan, Pannella,_Maurilio, Ciesla,_Laure, Gobat,_Raphael, Koyama,_Yusei

The Astrophysical Journal Letters　867　(2)　2018/11/10

DOI： 10.3847/2041-8213/aaeb2c 　

ISSN： 2041-8205
AzTEC 1.1 mm observations of high-z protocluster environments: SMG overdensities and misalignment between AGN jets and SMG distribution Peer-reviewed

Zeballos, M., Aretxaga, I., Hughes, D. H., Humphrey, A., Wilson, G. W., Austermann, J., Dunlop, J. S., Ezawa, H., Ferrusca, D., Hatsukade, B., Ivison, R. J., Kawabe, R., Kim, S., Kodama, T., Kohno, K., Montaña, A., Nakanishi, K., Plionis, M., Sánchez-Argüelles, D., Stevens, J. A., Tamura, Y., Velazquez, M., Yun, M. S.

Monthly Notices of the Royal Astronomical Society　479　(4)　4577-4632　2018/10

DOI： 10.1093/mnras/sty1714 　

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We present observations at 1.1 mm towards 16 powerful radio galaxies and a radio-quiet quasar at 0.5 < z < 6.3 acquired with the AzTEC camera mounted at the James Clerk Maxwell Telescope and Atacama Submillimeter Telescope Experiment to study the spatial distribution of submillimetre galaxies (SMGs) towards possible protocluster regions. The survey covers a total area of 1.01 sq deg with rms depths of 0.52-1.44 mJy and detects 728 sources above 3σ. We find overdensities of a factor of ̃2 in the source counts of three individual fields (4C+23.56, PKS1138-262, and MRC0355-037) over areas of ̃200 sq deg. When combining all fields, the source-count analysis finds an overdensity that reaches a factor ≳3 at S_1.1mm ≥ 4 mJy covering a 1.5-arcmin-radius area centred on the active galactic nucleus. The large size of our maps allows us to establish that beyond a radius of 1.5 arcmin, the radial surface density of SMGs falls to that of a blank field. In addition, we find a trend for SMGs to align closely to a perpendicular direction with respect to the radio jets of the powerful central radio galaxies (73_{+13}^{-14} deg). This misalignment is found over projected comoving scales of 4-20 Mpc, departs from perfect alignment (0 deg) by ̃5σ, and apparently has no dependence on SMG luminosity. Under the assumption that the AzTEC sources are at the redshift of the central radio galaxy, the misalignment reported here can be interpreted as SMGs preferentially inhabiting mass-dominant filaments funnelling material towards the protoclusters, which are also the parent structures of the radio galaxies. ...
A conceptual design study for Subaru ULTIMATE GLAO Peer-reviewed

François Rigaut, Yosuke Minowa, Masayuki Akiyama, Yoshito H. Ono, Visa A. Korkiakoski, Christophe S. Clergeon, Celine d'Orgeville, Gaston Gausachs, Nicholas Herrald, Ikuru Iwata, Ichi Tanaka, Tadayuki Kodama, Yutaka Hayano, Kentrao Motohara, Jordan Davies, Takashi Hattori, Yusei Koyama, Michitoshi Yoshida, Shiang-Yu Wang

Adaptive Optics Systems VI　10703　2018/07/10

DOI： 10.1117/12.2314085 　

ISSN： 0277-786X
Molecular gas reservoirs in cluster galaxies at z=1.46 Peer-reviewed

Masao Hayashi, Ken-ichi Tadaki, Tadayuki Kodama, Kotaro Kohno, Yuki Yamaguchi, Bunyo Hatsukade, Yusei Koyama, Rhythm Shimakawa, Yoichi Tamura, Tomoko L. Suzuki

ASTROPHYSICAL JOURNAL　856　(2)　2018/03/01

DOI： 10.3847/1538-4357/aab3e7 　

ISSN： 0004-637X
ALMA 26 arcmin² Survey of GOODS-S at One-millimeter (ASAGAO): X-Ray AGN Properties of Millimeter-selected Galaxies Peer-reviewed

Ueda, Y., Hatsukade, B., Kohno, K., Yamaguchi, Y., Tamura, Y., Umehata, H., Akiyama, M., Ao, Y., Aretxaga, I., Caputi, K., Dunlop, J. S., Espada, D., Fujimoto, S., Hayatsu, N. H., Imanishi, M., Inoue, A. K., Ivison, R. J., Kodama, T., Lee, M. M., Matsuoka, K., Miyaji, T., Morokuma-Matsui, K., Nagao, T., Nakanishi, K., Nyland, K., Ohta, K., Ouchi, M., Rujopakarn, W., Saito, T., Tadaki, K., Tanaka, I., Taniguchi, Y., Wang, T., Wang, W. -H., Yoshimura, Y., Yun, M. S.

The Astrophysical Journal　853　(1)　2018/01

DOI： 10.3847/1538-4357/aa9f10 　

ISSN： 0004-637X

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We investigate the X-ray active galactic nucleus (AGN) properties of millimeter galaxies in the Great Observatories Origins Deep Survey South (GOODS-S) field detected with the Atacama Large Millimeter/submillimeter Array (ALMA), by utilizing the Chandra 7-Ms data, the deepest X-ray survey to date. Our millimeter galaxy sample comes from the ASAGAO survey covering 26 arcmin² (12 sources at a 1.2 mm flux-density limit of ≈ 0.6 mJy), supplemented by the deeper but narrower 1.3 mm survey of a part of the ASAGAO field by Dunlop et al. Ofthe 25 total millimeter galaxies, 14 have Chandra counterparts. The observed AGN fractions at z=1.5{--}3 are found to be {90}_-19⁺⁸% and {57}_-25⁺²³% for the ultra-luminous and luminous infrared galaxies with log {L}_{IR}/{L}_☉ = 12-12.8 and log {L}_{IR}/{L}_☉ = 11.5-12, respectively. The majority (̃2/3) of the ALMA and/or Herschel detected X-ray AGNs at z = 1.5-3 appear to be star-formation-dominant populations, having {L}_{{ { X} } }/ {L}_{IR} ratios smaller than the “simultaneous evolution” value expected from the local black-hole-mass-to-stellar-mass ({M}_{BH}-M _*) relation. On the basis of the {L}_{{ { X} } } and stellar mass relation, we infer that a large fraction of star-forming galaxies at z=1.5{--}3 have black hole masses that are smaller than those expected from the local {M}_{BH}-M _* relation. This contrasts previous reports on luminous AGNs at the same redshifts detected in wider and shallower surveys, which are subject to selection biases against lower luminosity AGNs. Our results are consistent with an evolutionary scenario in which star formation occurs first, and an AGN-dominant phase follows later, in objects that finally evolve into galaxies with classical bulges....
MAHALO Deep Cluster Survey I. Accelerated and enhanced galaxy formation in the densest regions of a protocluster at z = 2.5 Peer-reviewed

Rhythm Shimakawa, Tadayuki Kodama, Masao Hayashi, J. Xavier Prochaska, Ichi Tanaka, Zheng Cai, Tomoko L. Suzuki, Ken-Ichi Tadaki, Yusei Koyama

Monthly Notices of the Royal Astronomical Society　473　(2)　1977-1999　2018/01/01

DOI： 10.1093/mnras/stx2494 　

ISSN： 1365-2966 0035-8711
GOLDRUSH. III. A systematic search for protoclusters at z ∼ 4 based on the >100 deg2 area Peer-reviewed

Jun Toshikawa, Hisakazu Uchiyama, Nobunari Kashikawa, Masami Ouchi, Roderik Overzier, Yoshiaki Ono, Yuichi Harikane, Shogo Ishikawa, Tadayuki Kodama, Yuichi Matsuda, Yen-Ting Lin, Masafusa Onoue, Masayuki Tanaka, Tohru Nagao, Masayuki Akiyama, Yutaka Komiyama, Tomotsugu Goto, Chien-Hsiu Lee

Publications of the Astronomical Society of Japan　70　2018/01/01

DOI： 10.1093/pasj/psx102 　

ISSN： 2053-051X 0004-6264
A 16 deg2 survey of emission-line galaxies at z < 1.5 in HSC-SSP Public Data Release 1 Peer-reviewed

Masao Hayashi, Masayuki Tanaka, Rhythm Shimakawa, Hisanori Furusawa, Rieko Momose, Yusei Koyama, John D Silverman, Tadayuki Kodama, Yutaka Komiyama, Alexie Leauthaud, Yen-Ting Lin, Satoshi Miyazaki, Tohru Nagao, Atsushi J Nishizawa, Masami Ouchi, Takatoshi Shibuya, Ken-Ichi Tadaki, Kiyoto Yabe

Publications of the Astronomical Society of Japan　70　2018/01/01

DOI： 10.1093/pasj/psx088 　

ISSN： 2053-051X 0004-6264
The nature of H α-selected galaxies along the large-scale structure at z = 0.4 revealed by Subaru Hyper Suprime-Cam survey Peer-reviewed

Yusei Koyama, Masao Hayashi, Masayuki Tanaka, Tadayuki Kodama, Rhythm Shimakawa, Moegi Yamamoto, Fumiaki Nakata, Ichi Tanaka, Tomoko L. Suzuki, Ken-Ichi Tadaki, Atsushi J. Nishizawa, Kiyoto Yabe, Yoshiki Toba, Lihwai Lin, Hung-Yu Jian, Yutaka Komiyama

Publications of the Astronomical Society of Japan　70　2018/01/01

DOI： 10.1093/pasj/psx078 　

ISSN： 2053-051X 0004-6264
Luminous quasars do not live in the most overdense regions of galaxies at z ∼ 4 Peer-reviewed

Hisakazu Uchiyama, Jun Toshikawa, Nobunari Kashikawa, Roderik Overzier, Yi-Kuan Chiang, Murilo Marinello, Masayuki Tanaka, Yuu Niino, Shogo Ishikawa, Masafusa Onoue, Kohei Ichikawa, Masayuki Akiyama, Jean Coupon, Yuichi Harikane, Masatoshi Imanishi, Tadayuki Kodama, Yutaka Komiyama, Chien-Hsiu Lee, Yen-Ting Lin, Satoshi Miyazaki, Tohru Nagao, Atsushi J. Nishizawa, Yoshiaki Ono, Masami Ouchi, Shiang-Yu Wang

Publications of the Astronomical Society of Japan　70　2018/01/01

DOI： 10.1093/pasj/psx112 　

ISSN： 2053-051X 0004-6264
Development status of the simultaneous two-color near-infrared multi-object spectrograph SWIMS for the TAO 6.5m telescope Peer-reviewed

Konishi Masahiro, Motohara Kentaro, Takahashi Hidenori, Kato Natsuko, Terao Yasunori, Ohashi Hirofumi, Kono Yukihiro, Kushibiki Kosuke, Kodama Tadayuki, Hayashi Masao, Tanaka Ichi, Tadaki Ken-ichi, Toshikawa Jun, Koyama Yusei, Shimakawa Rhythm, Suzuki Tomoko, Tateuchi Ken, Kitagawa Yutaro, Kobayakawa Yutaka, Todo Soya, Aoki Tsutomu, Doi Mamoru, Hatsukade Bunyo, Kamizuka Takafumi, Kohno Kotaro, Minezaki Takeo, Miyata Takashi, Morokuma Tomoki, Sako Shigeyuki, Soyano Takao, Tanabc Toshihiko, Tanaka Masuo, Tarusawa Ken'ichi, Tamura Yoichi, Koshida Shintaro, Ohsawa Ryou, Uchiyama Masahito, Mori Tomohiro, Yamaguchi Jumpei, Yoshida Yutaka, Yoshii Yuzuru

GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY VII　10702　2018

DOI： 10.1117/12.2310060 　

ISSN： 0277-786X
First Results on the Cluster Galaxy Population from the Subaru Hyper Suprime-Cam Survey. III. Brightest Cluster Galaxies, Stellar Mass Distribution, and Active Galaxies Peer-reviewed

Yen-Ting Lin, Bau-Ching Hsieh, Sheng-Chieh Lin, Masamune Oguri, Kai-Feng Chen, Masayuki Tanaka, I-Non Chiu, Song Huang, Tadayuki Kodama, Alexie Leauthaud, Surhud More, Atsushi J. Nishizawa, Kevin Bundy, Lihwai Lin, Satoshi Miyazaki

ASTROPHYSICAL JOURNAL　851　(2)　2017/12

DOI： 10.3847/1538-4357/aa9bf5 　

ISSN： 0004-637X

eISSN： 1538-4357
The Interstellar Medium in [O III]-selected Star-forming Galaxies at z similar to 3.2 Peer-reviewed

Tomoko L. Suzuki, Tadayuki Kodama, Masato Onodera, Rhythm Shimakawa, Masao Hayashi, Ken-ichi Tadaki, Yusei Koyama, Ichi Tanaka, David Sobral, Ian Smail, Philip N. Best, Ali A. Khostovan, Yosuke Minowa, Moegi Yamamoto

ASTROPHYSICAL JOURNAL　849　(1)　2017/11

DOI： 10.3847/1538-4357/aa8df3 　

ISSN： 0004-637X

eISSN： 1538-4357
SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES): Faint-end Counts at 450 mu m Peer-reviewed

Wei-Hao Wang, Wei-Ching Lin, Chen-Fatt Lim, Ian Smail, Scott C. Chapman, Xian Zhong Zheng, Hyunjin Shim, Tadayuki Kodama, Omar Almaini, Yiping Ao, Andrew W. Blain, Nathan Bourne, Andrew J. Bunker, Yu-Yen Chang, Dani C. -Y. Chao, Chian-Chou Chen, David L. Clements, Christopher J. Conselice, William I. Cowley, Helmut Dannerbauer, James S. Dunlop, James E. Geach, Tomotsugu Goto, Linhua Jiang, Rob J. Ivison, Woong-Seob Jeong, Kotaro Kohno, Xu Kong, Chien-Hsu Lee, Hyung Mok Lee, Minju Lee, Michal J. Michalowski, Ivan Oteo, Marcin Sawicki, Douglas Scott, Xin Wen Shu, James M. Simpson, Wei-Leong Tee, Yoshiki Toba, Elisabetta Valiante, Jun-Xian Wang, Ran Wang, Julie L. Wardlow

ASTROPHYSICAL JOURNAL　850　(1)　2017/11

DOI： 10.3847/1538-4357/aa911b 　

ISSN： 0004-637X

eISSN： 1538-4357
A Universal Correlation between Star Formation Activity and Molecular Gas Properties Across Environments Peer-reviewed

Shuhei Koyama, Yusei Koyama, Takuji Yamashita, Kana Morokuma-Matsui, Hideo Matsuhara, Takao Nakagawa, Masao Hayashi, Tadayuki Kodama, Rhythm Shimakawa, Tomoko L. Suzuki, Ken-ichi Tadaki, Ichi Tanaka, Moegi Yamamoto

ASTROPHYSICAL JOURNAL　847　(2)　2017/10

DOI： 10.3847/1538-4357/aa8a6c 　

ISSN： 0004-637X

eISSN： 1538-4357
An Imperfectly Passive Nature: Bright Submillimeter Emission from Dust-obscured Star Formation in the z=3.717 "Passive" System, ZF 20115 Peer-reviewed

J. M. Simpson, Ian Smail, Wei-Hao Wang, D. Riechers, J. S. Dunlop, Y. Ao, N. Bourne, A. Bunker, S. C. Chapman, Chian-Chou Chen, H. Dannerbauer, J. E. Geach, T. Goto, C. M. Harrison, H. S. Hwang, R. J. Ivison, Tadayuki Kodama, C. -H. Lee, H. -M. Lee, M. Lee, C. -F. Lim, M. J. Michalowski, D. J. Rosario, H. Shim, X. W. Shu, A. M. Swinbank, W. -L. Tee, Y. Toba, E. Valiante, Junxian Wang, X. Z. Zheng

ASTROPHYSICAL JOURNAL LETTERS　844　(1)　2017/07

DOI： 10.3847/2041-8213/aa7cf2 　

ISSN： 2041-8205

eISSN： 2041-8213
Direct evidence for Ly$\boldsymbol{\alpha }$ depletion in the protocluster core

Rhythm Shimakawa, Tadayuki Kodama, Masao Hayashi, Ichi Tanaka, Yuichi Matsuda, Nobunari Kashikawa, Takatoshi Shibuya, Ken-ichi Tadaki, Yusei Koyama, Tomoko L. Suzuki, Moegi Yamamoto

Monthly Notices of the Royal Astronomical Society: Letters　468　(1)　L21-L25　2017/06
Publisher: Oxford University Press (OUP)
DOI： 10.1093/mnrasl/slx019 　

ISSN： 1745-3925

eISSN： 1745-3933
Similarities and uniqueness of Ly alpha emitters among star-forming galaxies at z=2.5 Peer-reviewed

Rhythm Shimakawa, Tadayuki Kodama, Takatoshi Shibuya, Nobunari Kashikawa, Ichi Tanaka, Yuichi Matsuda, Ken-ichi Tadaki, Yusei Koyama, Masao Hayashi, Tomoko L. Suzuki, Moegi Yamamoto

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　468　(1)　1123-1141　2017/06

DOI： 10.1093/mnras/stx091 　

ISSN： 0035-8711

eISSN： 1365-2966
Direct evidence for Ly alpha depletion in the protocluster core Peer-reviewed

Rhythm Shimakawa, Tadayuki Kodama, Masao Hayashi, Ichi Tanaka, Yuichi Matsuda, Nobunari Kashikawa, Takatoshi Shibuya, Ken-ichi Tadaki, Yusei Koyama, Tomoko L. Suzuki, Moegi Yamamoto

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　468　(1)　L21-L25　2017/06

DOI： 10.1093/mnrasl/slx019 　

ISSN： 0035-8711

eISSN： 1365-2966
A radio-to-mm census of star-forming galaxies in protocluster 4C23.56 at z=2.5 : Gas mass and its fraction revealed with ALMA Peer-reviewed

Minju M. Lee, Ichi Tanaka, Ryohei Kawabe, Kotaro Kohno, Tadayuki Kodama, Masaru Kajisawa, Min S. Yun, Kouichiro Nakanishi, Daisuke Iono, Yoichi Tamura, Bunyo Hatsukade, Hideki Umehata, Toshiki Saito, Takuma Izumi, Itziar Aretxaga, Ken-ichi Tadaki, Milagros Zeballos, Soh Ikarashi, Grant W. Wilson, David H. Hughes, R. J. Ivison

ASTROPHYSICAL JOURNAL　842　(1)　2017/05/29

DOI： 10.3847/1538-4357/aa74c2 　

ISSN： 0004-637X

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We investigate gas contents of star-forming galaxies associated with protocluster 4C23.56 at z = 2.49 by using the redshifted CO(3-2) and 1.1 mm dust continuum with the Atacama Large Millimeter/submillimeter Array. The observations unveil seven CO detections out of 22 targeted H$\alpha$ emitters (HAEs) and four out of 19 in 1.1 mm dust continuum. They have high stellar mass ($M_{\star}>4\times 10^{10}$ $M_{\odot}$) and exhibit a specific star-formation rate typical of main-sequence star forming galaxies at $z\sim2.5$. Different gas mass estimators from CO(3-2) and 1.1 mm yield consistent values for simultaneous detections. The gas mass ($M_{\rm gas}$) and gas fraction ($f_{\rm gas}$) are comparable to those of field galaxies, with $M_{\rm gas}=[0.3, 1.8]\times10^{11} \times (\alpha_{\rm CO}/(4.36\times A(Z)$)) M$_{\odot}$, where $\alpha_{\rm CO}$ is the CO-to-H$_2$ conversion factor and $A(Z)$ the additional correction factor for the metallicity dependence of $\alpha_{\rm CO}$, and $\langle f_{\rm gas}\rangle = 0.53 \pm 0.07$ from CO(3-2). Our measurements place a constraint on the cosmic gas density of high-$z$ protoclusters, indicating the protocluster is characterized by a gas density higher than that of the general fields by an order of magnitude. We found $\rho (H_2)\sim 5 \times 10^9 \,M_{\odot}\,{\rm Mpc^{-3 } }$ with the CO(3-2) detections. The five ALMA CO detections occur in the region of highest galaxy surface density, where the density positively correlates with global star-forming efficiency (SFE) and stellar mass. Such correlations imply a potentially critical role of environment on early galaxy evolution at high-z protoclusters, although future observations are necessary for confirmation.
Evolutionary phases of gas-rich galaxies in a galaxy cluster at z=1.46 Peer-reviewed

Masao Hayashi, Tadayuki Kodama, Kotaro Kohno, Yuki Yamaguchi, Ken-ichi Tadaki, Bunyo Hatsukade, Yusei Koyama, Rhythm Shimakawa, Yoichi Tamura, Tomoko L. Suzuki

ASTROPHYSICAL JOURNAL LETTERS　841　(2)　2017/05/07

DOI： 10.3847/2041-8213/aa71ad 　

ISSN： 2041-8205

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We report a survey of molecular gas in galaxies in the XMMXCS J2215.9-1738 cluster at $z=1.46$. We have detected emission lines from 17 galaxies within a radius of $R_{200}$ from the cluster center, in Band 3 data of the Atacama Large Millimeter/submillimeter Array (ALMA) with a coverage of 93 -- 95 GHz in frequency and 2.33 arcmin$^2$ in spatial direction. The lines are all identified as CO $J$=2--1 emission lines from cluster members at $z\sim1.46$ by their redshifts and the colors of their optical and near-infrared (NIR) counterparts. The line luminosities reach down to $L'_{\rm CO(2-1)}=4.5\times10^{9}$ K km s$^{-1}$ pc$^2$. The spatial distribution of galaxies with a detection of CO(2--1) suggests that they disappear from the very center of the cluster. The phase-space diagram showing relative velocity versus cluster-centric distance indicates that the gas-rich galaxies have entered the cluster more recently than the gas-poor star-forming galaxies and passive galaxies located in the virialized region of this cluster. The results imply that the galaxies have experienced ram-pressure stripping and/or strangulation during the course of infall towards the cluster center and then the molecular gas in the galaxies at the cluster center is depleted by star formation.
Rotating starburst cores in massive galaxies at z=2.5 Peer-reviewed

Ken-ichi Tadaki, Tadayuki Kodama, Erica J. Nelson, Sirio Belli, Natascha M. Förster Schreiber, Reinhard Genzel, Masao Hayashi, Rodrigo Herrera-Camus, Yusei Koyama, Philipp Lang, Dieter Lutz, Rhythm Shimakawa, Linda J. Tacconi, Hannah Übler, Emily Wisnioski, Stijn Wuyts, Bunyo Hatsukade, Magdalena Lippa, Kouichiro Nakanishi, Soh Ikarashi, Kotaro Kohno, Tomoko L. Suzuki, Yoichi Tamura, Ichi Tanaka

ASTROPHYSICAL JOURNAL LETTERS　841　(2)　2017/03/29

DOI： 10.3847/2041-8213/aa7338 　

ISSN： 2041-8205

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We present spatially resolved ALMA observations of the CO J=3-2 emission line in two massive galaxies at z=2.5 on the star-forming main sequence. Both galaxies have compact dusty star-forming cores with effective radii of Re=1.3 kpc and Re=1.2 kpc in the 870 um continuum emission. The spatial extent of star-forming molecular gas is also compact with Re=1.9 kpc and Re=2.3 kpc, but more extended than the dust emission. Interpreting the observed position-velocity diagrams with dynamical models, we find the starburst cores to be rotation-dominated with the ratio of the maximum rotation velocity to the local velocity dispersion of v/sigma=7.0 (v=386 km/s) and v/sigma_0=4.1 (v=391 km/s). Given that the descendants of these massive galaxies in the local universe are likely ellipticals with v/sigma nearly an order of magnitude lower, the rapidly rotating galaxies would lose significant net angular momentum in the intervening time. The comparisons among dynamical, stellar, gas, and dust mass suggest that the starburst CO-to-H2 conversion factor of alpha_CO=0.8 Msun/(K km/s/pc2) is appropriate in the spatially resolved cores. The dense cores are likely to be formed in extreme environments similar to the central regions of local ultraluminous infrared galaxies. Our work also demonstrates that a combination of medium-resolution CO and high-resolution dust continuum observations is a powerful tool for characterizing the dynamical state of molecular gas in distant galaxies.
ULTIMATE-subaru: Wide-field near-infrared surveyor with GLAO at subaru telescope

Yosuke Minowa, Christophe Clergeon, Masayuki Akiyama, Francois Rigaut, Celine D'Orgeville, Ian Price, Nick Herrald, Yusei Koyama, Ikuru Iwata, Takashi Hattori, Tadayuki Kodama, Yutaka Hayano, Shin Oya, Ichi Tanaka, Kentaro Motohara, Nobuo Arimoto, Michitoshi Yoshida

Adaptive Optics for Extremely Large Telescopes, 2017 AO4ELT5　2017-　2017
Publisher: Instituto de Astrofisica de Canarias
THE SXDF-ALMA 2 arcmin2DEEP SURVEY: STACKING REST-FRAME NEAR-INFRARED SELECTED OBJECTS Peer-reviewed

Wang, Wei-Hao, Kohno, Kotaro, Hatsukade, Bunyo, Umehata, Hideki, Aretxaga, Itziar, Hughes, David, Caputi, Karina I, Dunlop, James S, Ikarashi, Soh, Iono, Daisuke, Ivison, Rob J, Lee, Minju, Makiya, Ryu, Matsuda, Yuichi, Motohara, Kentaro, Nakanish, Kouichiro, Ohta, Kouji, Tadaki, Ken-ichi, Tamura, Yoichi, Kodama, Tadayuki, Rujopakarn, Wiphu, Wilson, Grant W, Yamaguchi, Yuki, Yun, Min S, Coupon, Jean, Hsieh, Bau-Ching, Foucaud, Sebastien

The Astrophysical Journal　833　195　2016/12/16

DOI： 10.3847/1538-4357/833/2/195 　

ISSN： 1538-4357
[O iii] emission line as a tracer of star-forming galaxies at high redshifts: comparison between Hα and [O iii] emitters at z=2.23 in HiZELS

T. L. Suzuki, T. Kodama, D. Sobral, A. A. Khostovan, M. Hayashi, R. Shimakawa, Y. Koyama, K.-i. Tadaki, I. Tanaka, Y. Minowa, M. Yamamoto, I. Smail, P. N. Best

Monthly Notices of the Royal Astronomical Society　462　(1)　181-189　2016/10/11
Publisher: Oxford University Press (OUP)
DOI： 10.1093/mnras/stw1655 　

ISSN： 0035-8711

eISSN： 1365-2966
SXDF-ALMA 2-arcmin^2 Deep Survey: Stacking of Rest-Frame Near-Infrared Selected Objects Peer-reviewed

Wei-Hao Wang, Kotaro Kohno, Bunyo Hatsukade, Hideki Umehata, Itziar Aretxaga, David Hughes, Karina I. Caputi, James S. Dunlop, Soh Ikarashi, Daisuke Iono, Rob J. Ivison, Minju Lee, Ryu Makiya, Yuichi Matsuda, Kentaro Motohara, Kouichiro Nakanish, Kouji Ohta, Ken-ichi Tadaki, Yoichi Tamura, Tadayuki Kodama, Wiphu Rujopakarn, Grant W. Wilson, Yuki Yamaguchi, Min S. Yun, Jean Coupon, Bau-Ching Hsieh, Sebastien Foucaud

ASTROPHYSICAL JOURNAL　833　(2)　2016/09/28

DOI： 10.3847/1538-4357/833/2/195 　

ISSN： 0004-637X

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We present stacking analyses on our ALMA deep 1.1 mm imaging in the SXDF using 1.6 {\mu}m and 3.6 {\mu}m selected galaxies in the CANDELS WFC3 catalog. We detect a stacked flux of ~0.03-0.05 mJy, corresponding to LIR < 10^11 Lsun and a star formation rate (SFR) of ~ 15 Msun/yr at z = 2. We find that galaxies brighter in the rest-frame near-infrared tend to be also brighter at 1.1 mm, and galaxies fainter than m[3.6um] = 23 do not produce detectable 1.1 mm emission. This suggests a correlation between stellar mass and SFR, but outliers to this correlation are also observed, suggesting strongly boosted star formation or extremely large extinction. We also find tendencies that redder galaxies and galaxies at higher redshifts are brighter at 1.1 mm. Our field contains z ~ 2.5 H-alpha emitters and a bright single-dish source. However, we do not find evidence of bias in our results caused by the bright source. By combining the fluxes of sources detected by ALMA and fluxes of faint sources detected with stacking, we recover a 1.1 mm surface brightness of up to 20.3 +/- 1.2 Jy/deg, comparable to the extragalactic background light measured by COBE. Based on the fractions of optically faint sources in our and previous ALMA studies and the COBE measurements, we find that approximately half of the cosmic star formation may be obscured by dust and missed by deep optical surveys, Much deeper and wider ALMA imaging is therefore needed to better constrain the obscured cosmic star formation history.
ULTRA-DEEP K-S-BAND IMAGING OF THE HUBBLE FRONTIER FIELDS Peer-reviewed

Gabriel B. Brammer, Danilo Marchesini, Ivo Labbe, Lee Spitler, Daniel Lange-Vagle, Elizbeth A. Barker, Masayuki Tanaka, Adriano Fontana, Audrey Galametz, Anna Ferre-Mateu, Tadayuki Kodama, Britt Lundgren, Nicholas Martis, Adam Muzzin, Mauro Stefanon, Sune Toft, Arjen van der Wel, Benedetta Vulcani, Katherine E. Whitaker

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES　226　(1)　2016/09

DOI： 10.3847/0067-0049/226/1/6 　

ISSN： 0067-0049

eISSN： 1538-4365
Bulge-forming galaxies with an extended rotating disk at z~2 Peer-reviewed

Ken-ichi Tadaki, Reinhard Genzel, Tadayuki Kodama, Stijn Wuyts, Emily Wisnioski, Natascha M. Förster Schreiber, Andreas Burkert, Philipp Lang, Linda J. Tacconi, Dieter Lutz, Sirio Belli, Richard I. Davies, Bunyo Hatsukade, Masao Hayashi, Rodrigo Herrera-Camus, Soh Ikarashi, Shigeki Inoue, Kotaro Kohno, Yusei Koyama, J. Trevor Mendel, Kouichiro Nakanishi, Rhythm Shimakawa, Tomoko L. Suzuki, Yoichi Tamura, Ichi Tanaka, Hannah Übler, Dave J. Wilman

ASTROPHYSICAL JOURNAL　834　(2)　2016/08/18

DOI： 10.3847/1538-4357/834/2/135 　

ISSN： 0004-637X

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We present 0".2-resolution Atacama Large Millimeter/submillimeter Array observations at 870 um for 25 Halpha-seleced star-forming galaxies (SFGs) around the main-sequence at z=2.2-2.5. We detect significant 870 um continuum emission in 16 (64%) of these SFGs. The high-resolution maps reveal that the dust emission is mostly radiated from a single region close to the galaxy center. Exploiting the visibility data taken over a wide $uv$ distance range, we measure the half-light radii of the rest-frame far-infrared emission for the best sample of 12 massive galaxies with logM*>11. We find nine galaxies to be associated with extremely compact dust emission with R_{1/2,870um}<1.5 kpc, which is more than a factor of 2 smaller than their rest-optical sizes, R_{1/2,1.6um}=3.2 kpc, and is comparable with optical sizes of massive quiescent galaxies at similar redshifts. As they have an exponential disk with Sersic index of n=1.2 in the rest-optical, they are likely to be in the transition phase from extended disks to compact spheroids. Given their high star formation rate surface densities within the central 1 kpc of Sigma SFR1kpc=40 Msol/yr/kpc^2, the intense circumnuclear starbursts can rapidly build up a central bulge with Sigma M*1kpc>1e10 Msol/kpc^2 in several hundred Myr, i.e. by z~2. Moreover, ionized gas kinematics reveal that they are rotation-supported with an angular momentum as large as that of typical SFGs at z=1-3. Our results suggest bulges are commonly formed in extended rotating disks by internal processes, not involving major mergers.
ENHANCED STAR FORMATION OF LESS MASSIVE GALAXIES IN A PROTOCLUSTER AT z=2.5 Peer-reviewed

Masao Hayashi, Tadayuki Kodama, Ichi Tanaka, Rhythm Shimakawa, Yusei Koyama, Ken-ichi Tadaki, Tomoko L. Suzuki, Moegi Yamamoto

ASTROPHYSICAL JOURNAL LETTERS　826　(2)　2016/08

DOI： 10.3847/2041-8205/826/2/L28 　

ISSN： 2041-8205

eISSN： 2041-8213
SXDF-ALMA 2 Arcmin^2 Deep Survey: Resolving and Characterizing the Infrared Extragalactic Background Light Down to 0.5 mJy Peer-reviewed

Yuki Yamaguchi, Yoichi Tamura, Kotaro Kohno, Itziar Aretxaga, James S. Dunlop, Bunyo Hatsukade, David Hughes, Soh Ikarashi, Shun Ishii, Rob J. Ivison, Takuma Izumi, Ryohei Kawabe, Tadayuki Kodama, Minju Lee, Ryu Makiya, Yuichi Matsuda, Kouichiro Nakanishi, Kouji Ohta, Wiphu Rujopakarn, Ken-ichi Tadaki, Hideki Umehata, Wei-Hao Wang, Grant W. Wilson, Kiyoto Yabe, Min S. Yun

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN　68　(5)　2016/07/08

DOI： 10.1093/pasj/psw073 　

ISSN： 0004-6264

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We present a multi-wavelength analysis of five submillimeter sources (S_1.1mm = 0.54-2.02 mJy) that were detected during our 1.1-mm-deep continuum survey in the SXDF-UDS-CANDELS field (2 arcmin^2, 1sigma = 0.055 mJy beam^-1) using the Atacama Large Millimeter/submillimeter Array (ALMA). The two brightest sources correspond to a known single-dish (AzTEC) selected bright submillimeter galaxy (SMG), whereas the remaining three are faint SMGs newly uncovered by ALMA. If we exclude the two brightest sources, the contribution of the ALMA-detected faint SMGs to the infrared extragalactic background light is estimated to be ~ 4.1^{+5.4}_{-3.0} Jy deg^{-2}, which corresponds to ~ 16^{+22}_{-12}% of the infrared extragalactic background light. This suggests that their contribution to the infrared extragalactic background light is as large as that of bright SMGs. We identified multi-wavelength counterparts of the five ALMA sources. One of the sources (SXDF-ALMA3) is extremely faint in the optical to near-infrared region despite its infrared luminosity (L_IR ~ 1e12 L_sun or SFR ~ 100 M_sun yr^{-1}). By fitting the spectral energy distributions (SEDs) at the optical-to-near-infrared wavelengths of the remaining four ALMA sources, we obtained the photometric redshifts (z_photo) and stellar masses (M_*): z_photo ~ 1.3-2.5, M_* ~ (3.5-9.5)e10 M_sun. We also derived their star formation rates (SFRs) and specific SFRs (sSFRs) as ~ 30-200 M_sun yr^{-1} and ~ 0.8-2 Gyr^{-1}, respectively. These values imply that they are main-sequence star-forming galaxies.
GALAXY INFALL BY INTERACTING WITH ITS ENVIRONMENT: A COMPREHENSIVE STUDY OF 340 GALAXY CLUSTERS Peer-reviewed

Liyi Gu, Zhonglue Wen, Poshak Gandhi, Naohisa Inada, Madoka Kawaharada, Tadayuki Kodama, Saori Konami, Kazuhiro Nakazawa, Haiguang Xu, Kazuo Makishima

ASTROPHYSICAL JOURNAL　826　(1)　2016/07

DOI： 10.3847/0004-637X/826/1/72 　

ISSN： 0004-637X

eISSN： 1538-4357
The nature of H alpha star-forming galaxies at z similar to 0.4 in and around Cl 0939+4713: the environment matters Peer-reviewed

David Sobral, Andra Stroe, Yusei Koyama, Behnam Darvish, Joao Calhau, Ana Afonso, Tadayuki Kodama, Fumiaki Nakata

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　458　(4)　3443-3454　2016/06

DOI： 10.1093/mnras/stw534 　

ISSN： 0035-8711

eISSN： 1365-2966
SXDF-UDS-CANDELS-ALMA 1.5 arcmin^2 deep survey

Kohno, K, Yamaguchi, Y, Tamura, Y, Tadaki, K, Hatsukade, B, Ikarashi, S, Caputi, K. I, Rujopakarn, W, Ivison, R. J, Dunlop, J. S, Motohara, K, Umehata, H, Yabe, K, Wang, W.-H, Kodama, T, Koyama, Y, Hayashi, M, Matsuda, Y, Hughes, D, Aretxaga, I, Wilson, G. W, Yun, M. S, Ohta, K, Akiyama, M, Kawabe, R, Iono, D, Nakanishi, K, Lee, M, Makiya, R

ArXiv e-prints　arXiv:1601.00195　2016
Toward unveiling internal properties of HII regions and their connections at the cosmic noon era Peer-reviewed

Shimakawa Rhythm, Kodama Tadayuki, Hayashi Masao, Tadaki Ken-ichi, Suzuki Tomoko L, Koyama Yusei, Tanaka Ichi, Yamamoto Moegi

GALAXIES AT HIGH REDSHIFT AND THEIR EVOLUTION OVER COSMIC TIME　11　(S319)　53　2016

DOI： 10.1017/S1743921315010030 　

ISSN： 1743-9213
Dusty, Intensively Star Forming Hα Emitters (HAEs) in Protocluster 4C23.56 Peer-reviewed

Lee, M., Suzuki, K., Kohno, K., Tamura, Y., Iono, D., Hatsukade, B., Nakanishi, K., Tanaka, I., Kodama, T., Tadaki, K., Ikarashi, S., Ueda, J., Umehata, H., Saito, T., Kawabe, R.

Revolution in Astronomy with ALMA: The Third Year　499　27-28　2015/12

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We report on the measurements of physical properties of HAEs in protocluster 4C23.56 at z = 2.49 using deep and high resolution observations with ALMA at Band 6 (270 GHz) and JVLA at S-band (3 GHz). We detect four and seven out of 24 HAEs from ALMA and JVLA, and we find that the detected samples are in massive-end (log M_★(M_☉)≳10.1) . We derive extinction-free SFRs and the amount of dust attenuation based on JVLA detections for those without AGN features. The detected HAEs are massive and heavily dust-obscured star forming galaxies. The majority of these HAEs are experiencing burst-like phase. We derive interstellar medium (ISM) masses from the single band ALMA observation and all but one of ALMA detections have ISM mass fractions of ̃ 25% which is a tentatively low value compared to the samples of the general field. This suggests that an accelerated galaxy evolution may have occurred in the over-dense region at this high redshift, though the uncertainty is large. ...
Predicting dust extinction properties of star-forming galaxies from H alpha/UV ratio Peer-reviewed

Yusei Koyama, Tadayuki Kodama, Masao Hayashi, Rhythm Shimakawa, Issei Yamamura, Fumi Egusa, Nagisa Oi, Ichi Tanaka, Ken-ichi Tadaki, Satoshi Takita, Sin'itirou Makiuti

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　453　(1)　879-892　2015/10

DOI： 10.1093/mnras/stv1599 　

ISSN： 0035-8711

eISSN： 1365-2966
Environmental dependence of polycyclic aromatic hydrocarbon emission at z similar to 0.8 Investigation by observing RX J0152.7-1357 with AKARI Peer-reviewed

Kazumi Murata, Yusei Koyama, Masayuki Tanaka, Hideo Matsuhara, Tadayuki Kodama

ASTRONOMY & ASTROPHYSICS　581　2015/09

DOI： 10.1051/0004-6361/201526276 　

ISSN： 1432-0746
SXDF-ALMA 1.5 arcmin^2 deep survey. A compact dusty star-forming galaxy at z=2.5 Peer-reviewed

Ken-ichi Tadaki, Kotaro Kohno, Tadayuki Kodama, Soh Ikarashi, Itziar Aretxaga, Stefano Berta, Karina I. Caputi, James S. Dunlop, Bunyo Hatsukade, Masao Hayashi, David H. Hughes, Rob Ivison, Takuma Izumi, Yusei Koyama, Dieter Lutz, Ryu Makiya, Yuichi Matsuda, Kouichiro Nakanishi, Wiphu Rujopakarn, Yoichi Tamura, Hideki Umehata, Wei-Hao Wang, Grant W. Wilson, Stijn Wuyts, Yuki Yamaguchi, Min S. Yun

Astrophysical Journal Letters　811　(1)　2015/08/24

DOI： 10.1088/2041-8205/811/1/L3 　

ISSN： 2041-8205

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We present first results from the SXDF-ALMA 1.5 arcmin^2 deep survey at 1.1 mm using Atacama Large Millimeter Array (ALMA). The map reaches a 1sigma depth of 55 uJy/beam and covers 12 Halpha-selected star-forming galaxies at z = 2.19 or z=2.53. We have detected continuum emission from three of our Halpha-selected sample, including one compact star-forming galaxy with high stellar surface density, NB2315-07. They are all red in the rest-frame optical and have stellar masses of log (M*/Msun)>10.9 whereas the other blue, main-sequence galaxies with log(M*/Msun)=10.0-10.8 are exceedingly faint, <290 uJy (2sigma upper limit). We also find the 1.1 mm-brightest galaxy, NB2315-02, to be associated with a compact (R_e=0.7+-0.1 kpc), dusty star-forming component. Given high gas fraction (44^{+20}_{-8}% or 37^{+25}_{-3}%) and high star formation rate surface density (126^{+27}_{-30} Msun yr^{-1}kpc^{-2}), the concentrated starburst can within less than 50^{+12}_{-11} Myr build up a stellar surface density matching that of massive compact galaxies at z~2, provided at least 19+-3% of the total gas is converted into stars in the galaxy centre. On the other hand, NB2315-07, which already has such a high stellar surface density core, shows a gas fraction (23+-8%) and is located in the lower envelope of the star formation main-sequence. This compact less star-forming galaxy is likely to be in an intermediate phase between compact dusty star-forming and quiescent galaxies.
Correlation between star formation activity and electron density of ionized gas at z=2.5 Peer-reviewed

Rhythm Shimakawa, Tadayuki Kodama, Charles C. Steidel, Ken-ichi Tadaki, Ichi Tanaka, Allison L. Strom, Masao Hayashi, Yusei Koyama, Tomoko L. Suzuki, Moegi Yamamoto

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　451　(2)　1284-1289　2015/08

DOI： 10.1093/mnras/stv915 　

ISSN： 0035-8711

eISSN： 1365-2966
DUSTY STARBURSTS AND THE FORMATION OF ELLIPTICAL GALAXIES: A SCUBA-2 SURVEY OF A z=1.46 CLUSTER Peer-reviewed

C. -J. Ma, Ian Smail, A. M. Swinbank, J. M. Simpson, A. P. Thomson, C. -C. Chen, A. L. R. Danielson, M. Hilton, K. Tadaki, J. P. Stott, T. Kodama

ASTROPHYSICAL JOURNAL　806　(2)　2015/06

DOI： 10.1088/0004-637X/806/2/257 　

ISSN： 0004-637X

eISSN： 1538-4357
GALAXY FORMATION AT z > 3 REVEALED BY NARROWBAND-SELECTED [O III] EMISSION LINE GALAXIES Peer-reviewed

Tomoko L. Suzuki, Tadayuki Kodama, Ken-ichi Tadaki, Masao Hayashi, Yusei Koyama, Ichi Tanaka, Yosuke Minowa, Rhythm Shimakawa, Moegi Yamamoto

ASTROPHYSICAL JOURNAL　806　(2)　2015/06

DOI： 10.1088/0004-637X/806/2/208 　

ISSN： 0004-637X

eISSN： 1538-4357
Thirty Meter Telescope Detailed Science Case: 2015 Peer-reviewed

Warren Skidmore, Ian Dell'Antonio, Misato Fukugawa, Aruna Goswami, Lei Hao, David Jewitt, Greg Laughlin, Charles Steidel, Paul Hickson, Luc Simard, Matthias Schöck, Tommaso Treu, Judith Cohen, G. C. Anupama, Mark Dickinson, Fiona Harrison, Tadayuki Kodama, Jessica R. Lu, Bruce Macintosh, Matt Malkan, Shude Mao, Norio Narita, Tomohiko Sekiguchi, Annapurni Subramaniam, Masaomi Tanaka, Feng Tian, Michael A'Hearn, Masayuki Akiyama, Babar Ali, Wako Aoki, Manjari Bagchi, Aaron Barth, Varun Bhalerao, Marusa Bradac, James Bullock, Adam J. Burgasser, Scott Chapman, Ranga-Ram Chary, Masashi Chiba, Michael Cooper, Asantha Cooray, Ian Crossfield, Thayne Currie, Mousumi Das, G. C. Dewangan, Richard de Grijs, Tuan Do, Subo Dong, Jarah Evslin, Taotao Fang, Xuan Fang, Christopher Fassnacht, Leigh Fletcher, Eric Gaidos, Roy Gal, Andrea Ghez, Mauro Giavalisco, Carol A. Grady, Thomas Greathouse, Rupjyoti Gogoi, Puragra Guhathakurta, Luis Ho, Priya Hasan, Gregory J. Herczeg, Mitsuhiko Honda, Masa Imanishi, Hanae Inami, Masanori Iye, Jason Kalirai, U. S. Kamath, Stephen Kane, Nobunari Kashikawa, Mansi Kasliwal, Vishal Kasliwal, Evan Kirby, Quinn M. Konopacky, Sebastien Lepine, Di Li, Jianyang Li, Junjun Liu, Michael C. Liu, Enrigue Lopez-Rodriguez, Jennifer Lotz, Philip Lubin, Lucas Macri, Keiichi Maeda, Franck Marchis, Christian Marois, Alan Marscher, Crystal Martin, Taro Matsuo, Claire Max, Alan McConnachie, Stacy McGough, Carl Melis, Leo Meyer, Michael Mumma, Takayuki Muto, Tohru Nagao, Joan R. Najita, Julio Navarro, Michael Pierce, Jason X. Prochaska, Masamune Oguri, Devendra K. Ojha, Yoshiko K. Okamoto, Glenn Orton, Angel Otarola, Masami Ouchi, Chris Packham, Deborah L. Padgett, Shashi Bhushan Pandey, Catherine Pilachowsky, Klaus M. Pontoppidan, Joel Primack, Shalima Puthiyaveettil, Enrico Ramirez-Ruiz, Naveen Reddy, Michael Rich, Matthew J. Richter, James Schombert, Anjan Ananda Sen, Jianrong Shi, Kartik Sheth, R. Srianand, Jonathan C. Tan, Masayuki Tanaka, Angelle Tanner, Nozomu Tominaga, David Tytler, Vivian U, Lingzhi Wang, Xiaofeng Wang, Yiping Wang, Gillian Wilson, Shelley Wright, Chao Wu, Xufeng Wu, Renxin Xu, Toru Yamada, Bin Yang, Gongbo Zhao, Hongsheng Zhao

2015/05/05

DOI： 10.1088/1674-4527/15/12/001 　

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The TMT Detailed Science Case describes the transformational science that the Thirty Meter Telescope will enable. Planned to begin science operations in 2024, TMT will open up opportunities for revolutionary discoveries in essentially every field of astronomy, astrophysics and cosmology, seeing much fainter objects much more clearly than existing telescopes. Per this capability, TMT's science agenda fills all of space and time, from nearby comets and asteroids, to exoplanets, to the most distant galaxies, and all the way back to the very first sources of light in the Universe. More than 150 astronomers from within the TMT partnership and beyond offered input in compiling the new 2015 Detailed Science Case. The contributing astronomers represent the entire TMT partnership, including the California Institute of Technology (Caltech), the Indian Institute of Astrophysics (IIA), the National Astronomical Observatories of the Chinese Academy of Sciences (NAOC), the National Astronomical Observatory of Japan (NAOJ), the University of California, the Association of Canadian Universities for Research in Astronomy (ACURA) and US associate partner, the Association of Universities for Research in Astronomy (AURA).
The environments of Ly alpha blobs - I. Wide-field Ly alpha imaging of TN J1338-1942, a powerful radio galaxy at z similar or equal to 4.1 associated with a giant Ly alpha nebula Peer-reviewed

Tomoki Saito, Yuichi Matsuda, Cedric G. Lacey, Ian Smail, Alvaro Orsi, Carlton M. Baugh, Akio K. Inoue, Ichi Tanaka, Toru Yamada, Kouji Ohta, Carlos De Breuck, Tadayuki Kodama, Yoshiaki Taniguchi

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　447　(4)　3069-3086　2015/03

DOI： 10.1093/mnras/stu2538 　

ISSN： 0035-8711

eISSN： 1365-2966
An early phase of environmental effects on galaxy properties unveiled by near-infrared spectroscopy of protocluster galaxies at z > 2 Peer-reviewed

Rhythm Shimakawa, Tadayuki Kodama, Ken-ichi Tadaki, Masao Hayashi, Yusei Koyama, Ichi Tanaka

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　448　(1)　666-680　2015/03

DOI： 10.1093/mnras/stv051 　

ISSN： 0035-8711

eISSN： 1365-2966
DISCOVERY OF NINE EXTENDED IONIZED GAS CLOUDS IN A z=0.4 CLUSTER Peer-reviewed

Masafumi Yagi, Liyi Gu, Yusei Koyama, Fumiaki Nakata, Tadayuki Kodama, Takashi Hattori, Michitoshi Yoshida

ASTRONOMICAL JOURNAL　149　(2)　2015/02

DOI： 10.1088/0004-6256/149/2/36 　

ISSN： 0004-6256

eISSN： 1538-3881
DISCOVERY OF NINE EXTENDED IONIZED GAS CLOUDS IN Az= 0.4 CLUSTER Peer-reviewed

Masafumi Yagi, Liyi Gu, Yusei Koyama, Fumiaki Nakata, Tadayuki Kodama, Takashi Hattori, Michitoshi Yoshida

The Astronomical Journal　149　(2)　36　2015/01
Publisher: {IOP} Publishing
DOI： 10.1088/0004-6256/149/2/36 　

ISSN： 1538-3881
NATURE OF H alpha SELECTED GALAXIES AT z > 2. I. MAIN-SEQUENCE AND DUSTY STAR-FORMING GALAXIES (vol 778, pg 114, 2013) Peer-reviewed

Ken-ichi Tadaki, Tadayuki Kodama, Ichi Tanaka, Masao Hayashi, Yusei Koyama, Rhythm Shimakawa

ASTROPHYSICAL JOURNAL　795　(1)　2014/11

DOI： 10.1088/0004-637X/795/1/101 　

ISSN： 0004-637X

eISSN： 1538-4357
THE ENVIRONMENTAL IMPACTS ON THE STAR FORMATION MAIN SEQUENCE: AN H alpha STUDY OF THE NEWLY DISCOVERED RICH CLUSTER AT z=1.52 Peer-reviewed

Yusei Koyama, Tadayuki Kodama, Ken-ichi Tadaki, Masao Hayashi, Ichi Tanaka, Rhythm Shimakawa

ASTROPHYSICAL JOURNAL　789　(1)　2014/07

DOI： 10.1088/0004-637X/789/1/18 　

ISSN： 0004-637X

eISSN： 1538-4357
Identification of the progenitors of rich clusters and member galaxies in rapid formation at z > 2 Peer-reviewed

Rhythm Shimakawa, Tadayuki Kodama, Ken-ichi Tadaki, Ichi Tanaka, Masao Hayashi, Yusei Koyama

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　441　(1)　L1-L5　2014/06

DOI： 10.1093/mnrasl/slu029 　

ISSN： 0035-8711

eISSN： 1365-2966
Mapping the large-scale structure around a z=1.46 galaxy cluster in 3D using two adjacent narrow-band filters Peer-reviewed

Masao Hayashi, Tadayuki Kodama, Yusei Koyama, Ken-ichi Tadaki, Ichi Tanaka, Rhythm Shimakawa, Yuichi Matsuda, David Sobral, Philip N. Best, Ian Smail

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　439　(3)　2571-2583　2014/04

DOI： 10.1093/mnras/stu115 　

ISSN： 0035-8711

eISSN： 1365-2966
Evidence for a gas-rich major merger in a proto-cluster at z=2.5 Peer-reviewed

Ken-ichi Tadaki, Tadayuki Kodama, Yoichi Tamura, Masao Hayashi, Yusei Koyama, Rhythm Shimakawa, Ichi Tanaka, Kotaro Kohno, Bunyo Hatsukade, Kenta Suzuki

ASTROPHYSICAL JOURNAL LETTERS　788　(2)　2014/03/01

DOI： 10.1088/2041-8205/788/2/L23 　

ISSN： 2041-8205

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Gas-rich major mergers in high-redshift proto-clusters are important events, perhaps leading to the creation of the slowly rotating remnants seen in the cores of clusters in the present day. Here, we present a deep Jansky Very Large Array observation of CO J = 1-0 emission line in a proto-cluster at z = 2.5, USS1558-003. The target field is an extremely dense region, where 20 H-alpha emitters (HAEs) are clustering. We have successfully detected the CO emission line from three HAEs and discovered a close pair of red and blue CO-emitting HAEs. Given their close proximity (~30 kpc), small velocity offset (~300 km/s), and similar stellar masses, they could be in the early phase of a gas-rich major merger. For the red HAE, we derive a total infrared luminosity of L(IR)=5.1e12 Lsun using MIPS 24 um and radio continuum images. The L(IR)/L'(CO) ratio is significantly enhanced compared to local spirals and high-redshift disks with a similar CO luminosity, which is indicative of a starburst mode. We find the gas depletion timescale is shorter than that of normal star-forming galaxies regardless of adopted CO-H2 conversion factors. The identification of such a rare event suggests that gas-rich major mergers frequently take place in proto-clusters at z > 2 and may involve the formation processes of slow rotators seen in local massive clusters.
THE SCUBA-2 COSMOLOGY LEGACY SURVEY: ULTRALUMINOUS STAR-FORMING GALAXIES IN A z=1.6 CLUSTER Peer-reviewed

Ian Smail, J. E. Geach, A. M. Swinbank, K. Tadaki, V. Arumugam, W. Hartley, O. Almaini, M. N. Bremer, E. Chapin, S. C. Chapman, A. L. R. Danielson, A. C. Edge, D. Scott, C. J. Simpson, J. M. Simpson, C. Conselice, J. S. Dunlop, R. J. Ivison, A. Karim, T. Kodama, A. Mortlock, E. I. Robson, I. Roseboom, A. P. Thomson, P. P. van der Werf, T. M. A. Webb

ASTROPHYSICAL JOURNAL　782　(1)　2014/02

DOI： 10.1088/0004-637X/782/1/19 　

ISSN： 0004-637X

eISSN： 1538-4357
Identification of the progenitors of rich clusters and member galaxies in rapid formation at z > 2 Peer-reviewed

Rhythm Shimakawa, Tadayuki Kodama, Ken-Ichi Tadaki, Ichi Tanaka, Masao Hayashi, Yusei Koyama

Monthly Notices of the Royal Astronomical Society: Letters　441　(1)　L1-L5　2014
Publisher: Blackwell Publishing Ltd
DOI： 10.1093/mnrasl/slu029 　

ISSN： 1745-3933 1745-3925
ULTIMATE-SUBARU: project status Peer-reviewed

Yutaka Hayano, Masayuki Akiyama, Takashi Hattori, Ikuru Iwata, Tadayuki Kodama, Olivier Lai, Yosuke Minowa, Yoshito Ono, Shin Oya, Koki Takiura, Ichi Tanaka, Yoko Tanaka, Nobuo Arimito

ADAPTIVE OPTICS SYSTEMS IV　9148　2014

DOI： 10.1117/12.2055042 　

ISSN： 0277-786X
ULTIMATE-SUBARU: simulation update Peer-reviewed

Shin Oya, Yutaka Hayano, Olivier Lai, Ikuru Iwata, Tadayuki Kodama, Nobuo Arimoto, Yosuke Minowa, Masayuki Akiyama, Yoshito H. Ono, Hiroshi Terada, Tomonori Usuda, Hideki Takami, Testuo Nishimura, Naruhisa Takato, Daigo Tomono

ADAPTIVE OPTICS SYSTEMS IV　9148　2014

DOI： 10.1117/12.2055701 　

ISSN： 0277-786X
THE NATURE OF H alpha-SELECTED GALAXIES AT z > 2. II. CLUMPY GALAXIES AND COMPACT STAR-FORMING GALAXIES Peer-reviewed

Ken-ichi Tadaki, Tadayuki Kodama, Ichi Tanaka, Masao Hayashi, Yusei Koyama, Rhythm Shimakawa

ASTROPHYSICAL JOURNAL　780　(1)　2014/01

DOI： 10.1088/0004-637X/780/1/77 　

ISSN： 0004-637X

eISSN： 1538-4357
Environmental dependence of galaxy formation explored by near-infrared spectroscopy of two protoclusters at z > 2 Peer-reviewed

Shimakawa Rhythm, Kodama Tadayuki, Tadaki Ken-ichi, Hayashi Masao, Koyama Yusei, Tanaka Ichi

GALAXIES IN 3D ACROSS THE UNIVERSE　10　(309)　345　2014

DOI： 10.1017/S1743921314010370 　

ISSN： 1743-9213
287-288 Jansky VLA S-band view of Hα emitters (HAEs) associated with a protocluster 4C23.56 at z = 2.5 Peer-reviewed

Minju Lee, Kenta Suzuki, Kotaro Kohno, Yoichi Tamura, Daisuke Iono, Bunyo Hatsukade, Kouichiro Nakanishi, Ichi Tanaka, Tadayuki Kodama, Kenichi Tadaki, Soh Ikarashi, Junko Ueda, Hideki Umehata, Toshiki Saito, Ryohei Kawabe

Proceedings of the International Astronomical Union　10　(309)　287-288　2014

DOI： 10.1017/S1743921314009892 　

ISSN： 1743-9221 1743-9213
Mapping and resolving galaxy formation at its peak epoch with Mahalo-Subaru and Gracias-ALMA Peer-reviewed

Tadayuki Kodama, Masao Hayashi, Yusei Koyama, Ken-Ichi Tadaki, Ichi Tanaka, Rhythm Shimakawa, Tomoko Suzuki, Moegi Yamamoto

Proceedings of the International Astronomical Union　10　(309)　255-258　2014

DOI： 10.1017/S1743921314009818 　

ISSN： 1743-9221 1743-9213
A fundamental metallicity relation for galaxies at z=0.84-1.47 from HiZELS Peer-reviewed

John P. Stott, David Sobral, Richard Bower, Ian Smail, Philip N. Best, Yuichi Matsuda, Masao Hayashi, James E. Geach, Tadayuki Kodama

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　436　(2)　1130-1141　2013/12

DOI： 10.1093/mnras/stt1641 　

ISSN： 0035-8711

eISSN： 1365-2966
NATURE OF Ha SELECTED GALAXIES AT z > 2. I. MAIN-SEQUENCE AND DUSTY STAR-FORMING GALAXIES Peer-reviewed

Ken-ichi Tadaki, Tadayuki Kodama, Ichi Tanaka, Masao Hayashi, Yusei Koyama, Rhythm Shimakawa

ASTROPHYSICAL JOURNAL　778　(2)　2013/12

DOI： 10.1088/0004-637X/778/2/114 　

ISSN： 0004-637X

eISSN： 1538-4357
Sub-mm Singledish and Interferometric Observations of the Proto-Cluster around 4C 23.56 at z = 2.5 Peer-reviewed

Suzuki, K., Kohno, K., Tanaka, I., Kodama, T., Hatsukade, B., Tamura, Y., Nakanishi, K., Iono, D., Kajisawa, M., Ikarashi, S., Umehata, H., Ivison, R. J., Wilson, G. W., Yun, M. S., Hughes, D. H., Aretxaga, I., Zeballos, M.

New Trends in Radio Astronomy in the ALMA Era: The 30th Anniversary of Nobeyama Radio Observatory　2013/10

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We investigate the association of multiple mm-bright galaxies to the proto-cluster around 4C 23.56 at z = 2.48 by the combined observation of the AzTEC/ASTE singledish and the Plateau de Bure Interferometer. We detected 1.8 mm emissions from four HAEs associated with this proto-cluster, and detected CO line from two of them. From these observed values, we investigated their star formation rates (SFRs) and variation in mass compositions. Their SFRs are estimated as 60 to 690 M_☉ yr^-1 from their submm-mm fluxes. SFRs from mm fluxes for three HAEs are comparable to SFRs from extinction corrected Hα luminosity, but only for HAE 431, large discrepancy in two SFR estimators is seen and large star formation should be dust-obscured....
From Mahalo-Subaru to Gracias-ALMA: Resolving Galaxy Formation at Its Peak Epoch Peer-reviewed

Kodama, T., Tanaka, I., Hayashi, M., Koyama, Y., Tadaki, K., Shimakawa, R., Kohno, K., Tamura, Y.

New Trends in Radio Astronomy in the ALMA Era: The 30th Anniversary of Nobeyama Radio Observatory　476　37-40　2013/10

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The redshift interval of 1.5-2.5 is the critical era for galaxy formation and early evolution when the star forming and AGN activities are both highest. Also, these activities should be dependent on environment given the clear habitat segregation of different types of galaxies seen today. It is essential therefore to systematically search for star forming galaxies over this critical epoch and across different environments, and investigate their physical properties in detail. For this purpose, we design a fully coordinated program between Subaru and ALMA. With Subaru, we have been conducting the Mahalo-Subaru project which maps out star-forming galaxies (Hɑ and OII emitters) at 1.5 ≤ z ≤ 2.5 across various environments, by employing the unique set of custom-made narrow-band filters and wide-field cameras. With ALMA, we propose to conduct the Gracias-ALMA project which aims to observe CO lines and dust continua of star forming galaxies with great spatial resolution and high sensitivity, based on our Mahalo-Subaru sample. We will scrutinize the physical states and the mode of star formation both globally and locally within galaxies, and identify the physical processes that regulate star-forming activities as a function of time and environment. ...
On the evolution and environmental dependence of the star formation rate versus stellar mass relation since z similar to 2 Peer-reviewed

Yusei Koyama, Ian Smail, Jaron Kurk, James E. Geach, David Sobral, Tadayuki Kodama, Fumiaki Nakata, A. M. Swinbank, Philip N. Best, Masao Hayashi, Ken-ichi Tadaki

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　434　(1)　423-436　2013/09

DOI： 10.1093/mnras/stt1035 　

ISSN： 0035-8711

eISSN： 1365-2966
ON THE FORMATION TIMESCALE OF MASSIVE CLUSTER ELLIPTICALS BASED ON DEEP NEAR-INFRARED SPECTROSCOPY AT z similar to 2 Peer-reviewed

Masayuki Tanaka, Sune Toft, Danilo Marchesini, Andrew Zirm, Carlos De Breuck, Tadayuki Kodama, Yusei Koyama, Jaron Kurk, Ichi Tanaka

ASTROPHYSICAL JOURNAL　772　(2)　2013/08

DOI： 10.1088/0004-637X/772/2/113 　

ISSN： 0004-637X

eISSN： 1538-4357
Sperm-associated antigen 4, a novel hypoxia-inducible factor 1 target, regulates cytokinesis, and its expression correlates with the prognosis of renal cell carcinoma. International-journal Peer-reviewed

Shoji K, Murayama T, Mimura I, Wada T, Kume H, Goto A, Ohse T, Tanaka T, Inagi R, van der Hoorn FA, Manabe I, Homma Y, Fukayama M, Sakurai T, Hasegawa T, Aburatani H, Kodama T, Nangaku M

The American journal of pathology　182　(6)　2191-2203　2013/06

DOI： 10.1016/j.ajpath.2013.02.024 　

ISSN： 0002-9440

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Hypoxia plays a crucial role in many pathophysiological conditions, including cancer biology, and hypoxia-inducible factor (HIF) regulates transcriptional responses under hypoxia. To elucidate the cellular responses to hypoxia, we performed chromatin immunoprecipitation with deep sequencing in combination with microarray analysis and identified HIF-1 targets. We focused on one of the novel targets, sperm-associated antigen 4 (SPAG4), whose function was unknown. SPAG4, an HIF-1-specific target, is up-regulated in various cultured cells under hypoxia. Examination of SPAG4 expression using a tissue microarray consisting of 190 human renal cell carcinoma (RCC) samples revealed that SPAG4 is an independent prognostic factor of cancer-specific mortality. Live-cell imaging revealed localization of SPAG4 at the intercellular bridge in telophase. We also studied cells in which SPAG4 was knocked down. Hypoxia enhances tetraploidy, which disturbs cell proliferation, and knockdown of SPAG4 increased tetraploid formation and decreased cell proliferation under both normoxic and hypoxic conditions. Studies using deletion mutants of SPAG4 also suggested the involvement of SPAG4 in cytokinesis. Microarray analysis confirmed dysregulation of cytokinesis-related genes by knockdown of SPAG4. In conclusion, SPAG4 is an independent prognostic factor in RCC and plays a crucial role in cytokinesis to defend against hypoxia-induced tetraploid formation. This defensive mechanism may promote survival of cancer cells under hypoxic conditions, thus leading to poor prognosis.
PROBING OF THE INTERACTIONS BETWEEN THE HOT PLASMAS AND GALAXIES IN CLUSTERS FROM z=0.1 TO 0.9 Peer-reviewed

Liyi Gu, Poshak Gandhi, Naohisa Inada, Madoka Kawaharada, Tadayuki Kodama, Saori Konami, Kazuhiro Nakazawa, Kazuhiro Shimasaku, Haiguang Xu, Kazuo Makishima

ASTROPHYSICAL JOURNAL　767　(2)　2013/04

DOI： 10.1088/0004-637X/767/2/157 　

ISSN： 0004-637X
Re-evaluating hot Jupiter WASP-12b: An update Peer-reviewed

Ian J. M. Crossfield, Travis Barman, Brad M. S. Hansen, Ichi Tanaka, Tadayuki Kodama

HOT PLANETS AND COOL STARS　47　2013

DOI： 10.1051/epjconf/20134713005 　

ISSN： 2100-014X
Massive starburst galaxies in a z = 2.16 proto-cluster unveiled: By panoramic Hα mapping Peer-reviewed

Yusei Koyama, Tadayuki Kodama, Ken-Ichi Tadaki, Masao Hayashi, Masayuki Tanaka, Ian Smail, Ichi Tanaka, Jaron Kurk

Monthly Notices of the Royal Astronomical Society　428　(2)　1551-1564　2013/01

DOI： 10.1093/mnras/sts133 　

ISSN： 0035-8711 1365-2966
Calibrating [O II] star formation rates at z > 1 from dual Hα-[O II] imaging from HiZELS Peer-reviewed

Masao Hayashi, David Sobral, Philip N. Best, Ian Smail, Tadayuki Kodama

Monthly Notices of the Royal Astronomical Society　430　(2)　1042-1050　2013

DOI： 10.1093/mnras/sts676 　

ISSN： 0035-8711 1365-2966
RE-EVALUATING WASP-12b: STRONG EMISSION AT 2.315 mu m, DEEPER OCCULTATIONS, AND AN ISOTHERMAL ATMOSPHERE Peer-reviewed

Ian J. M. Crossfield, Travis Barman, Brad M. S. Hansen, Ichi Tanaka, Tadayuki Kodama

ASTROPHYSICAL JOURNAL　760　(2)　2012/12

DOI： 10.1088/0004-637X/760/2/140 　

ISSN： 0004-637X
A STARBURSTING PROTO-CLUSTER IN MAKING ASSOCIATED WITH A RADIO GALAXY AT z=2.53 DISCOVERED BY H alpha IMAGING Peer-reviewed

Masao Hayashi, Tadayuki Kodama, Ken-ichi Tadaki, Yusei Koyama, Ichi Tanaka

ASTROPHYSICAL JOURNAL　757　(1)　2012/09

DOI： 10.1088/0004-637X/757/1/15 　

ISSN： 0004-637X

eISSN： 1538-4357
Initial Results from Nobeyama Molecular Gas Observations of Distant Bright Galaxies Peer-reviewed

Iono, D, Hatsukade, B, Kohno, K, Kawabe, R, Ikarashi, S, Ichikawa, K, Kodama, T, Motohara, K, Nakajima, T, Nakanishi, K, Ohta, K, Ota, K, Saito, T, Suzuki, K, Tadaki, K.-i, Tamura, Y, Ueda, J, Umehata, H, Yabe, K, Yoshida, T, Yuma, S, Kuno, N, Takano, S, Iwashita, H, Handa, K, Higuchi, A, Hirota, A, Ishikawa, S, Kimura, K, Maekawa, J, Mikoshiba, H, Miyazawa, C, Miyazawa, K, Muraoka, K, Ogawa, H, Onodera, S, Saito, Y, Sakai, T, Takahashi, S, Yun, M. S

Publications of the Astronomical Society of Japan　64　L2　2012/08/25

DOI： 10.1093/pasj/64.4.l2 　

ISSN： 2053-051X
Initial Results from Nobeyama Molecular Gas Observations of Distant Bright Galaxies Peer-reviewed

IONO Daisuke, HATSUKADE Bunyo, KOHNO Kotaro, KAWABE Ryohei, IKARASHI Soh, ICHIKAWA Kohei, KODAMA Tadayuki, MOTOHARA Kentaro, NAKAJIMA Taku, NAKANISHI Koichiro, OHTA Kouji, OTA Kazuaki, SAITO Toshiki, SUZUKI Kenta, TADAKI Ken-ichi, TAMURA Yoichi, UEDA Junko, UMEHATA Hideki, YABE Kiyoto, YOSHIDA Tessei, YUMA Suraphong, KUNO Nario, TAKANO Shuro, IWASHITA Hiroyuki, HANDA Kazuyuki, HIGUCHI Aya, HIROTA Akihiko, ISHIKAWA Shinichi, KIMURA Kimihiro, MAEKAWA Jun, MIKOSHIBA Hiroshi, MIYAZAWA Chieko, MIYAZAWA Kazuhiko, MURAOKA Kazuyuki, OGAWA Hideo, ONODERA Sachiko, SAITO Yasufumi, SAKAI Takeshi, TAKAHASHI Shigeru, YUN Min S.

Publications of the Astronomical Society of Japan　64　(4)　"L2-1"-"L2-4"　2012/08/25
Publisher: Astronomical Society of Japan
DOI： 10.1093/pasj/64.4.L2 　

ISSN： 0004-6264
Mahalo-subaru: Mapping star formation at the peak epoch of massive galaxy formation Peer-reviewed

Tadayuki Kodama, Masao Hayashi, Yusei Koyama, Ken-Ichi Tadaki, Ichi Tanaka, Rhythm Shimakawa

Proceedings of the International Astronomical Union　8　(295)　74-77　2012/08

DOI： 10.1017/S1743921313004353 　

ISSN： 1743-9213 1743-9221
EARLY-TYPE GALAXIES AT z=1.3. I. THE LYNX SUPERCLUSTER: CLUSTER AND GROUPS AT z=1.3. MORPHOLOGY AND COLOR-MAGNITUDE RELATION Peer-reviewed

Simona Mei, S. Adam Stanford, Brad P. Holden, Anand Raichoor, Marc Postman, Fumiaki Nakata, Alexis Finoguenov, Holland C. Ford, Garth D. Illingworth, Tadayuki Kodama, Piero Rosati, Masayuki Tanaka, Marc Huertas-Company, Alessandro Rettura, Francesco Shankar, Eleazar R. Carrasco, Ricardo Demarco, Peter Eisenhardt, Myungkook J. Jee, Yusei Koyama, Richard L. White

ASTROPHYSICAL JOURNAL　754　(2)　2012/08

DOI： 10.1088/0004-637X/754/2/141 　

ISSN： 0004-637X

eISSN： 1538-4357
A large-scale structure traced by [O ii] emitters hosting a distant cluster at z=1.62 Peer-reviewed

Ken-ichi Tadaki, Tadayuki Kodama, Kazuaki Ota, Masao Hayashi, Yusei Koyama, Casey Papovich, Mark Brodwin, Masayuki Tanaka, Masanori Iye

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　423　(3)　2617-2626　2012/07

DOI： 10.1111/j.1365-2966.2012.21063.x 　

ISSN： 0035-8711

eISSN： 1365-2966
WISH for deep and wide NIR surveys Peer-reviewed

Toru Yamada, Ikuru Iwata, Makiko Ando, Mamoru Doi, Tomotsugu Goto, Yuji Ikeda, Masatoshi Imanishi, Akio K. Inoue, Satoru Iwamura, Nobuyuki Kawai, Masakazu A. R. Kobayashi, Tadayuki Kodama, Yutaka Komiyama, Mariko Kubo, Hideo Matsuhara, Ken Mawatari, Matsuokak Yoshiki, Tomoki Morokuma, Hidehiko Nakaya, Kouji Ohta, Atsushi Okamoto, Sinki Oyabu, Yoichi Sato, Hiroyuki Sugita, Ryo Tsutsui, Chihiro Tokoku, Jun Toshikawa, Saku Tsuneta, Takehiko Wada, Kiyoto Yabe, Naoki Yasuda, Daisuke Yonetoku

SPACE TELESCOPES AND INSTRUMENTATION 2012: OPTICAL, INFRARED, AND MILLIMETER WAVE　8442　2012

DOI： 10.1117/12.925632 　

ISSN： 0277-786X
A preliminary simulation result of the next-generation wide-field AO at Subaru Telescope Peer-reviewed

Shin Oya, Masayuki Akiyama, Yutaka Hayano, Yosuke Minowa, Ikuru Iwata, Hiroshi Terada, Tomonori Usuda, Hideki Takami, Testuo Nishimura, Tadayuki Kodama, Naruhisa Takato, Daigo Tomono, Yoshito Ono

ADAPTIVE OPTICS SYSTEMS III　8447　2012

DOI： 10.1117/12.926556 　

ISSN： 0277-786X
An H alpha search for overdense regions at z=2.23

Y. Matsuda, Ian Smail, J. E. Geach, P. N. Best, D. Sobral, I. Tanaka, F. Nakata, K. Ohta, J. Kurk, I. Iwata, Rich Bielby, J. L. Wardlow, R. G. Bower, R. J. Ivison, T. Kodama, T. Yamada, K. Mawatari, M. Casali

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　416　(3)　2041-2059　2011/09

DOI： 10.1111/j.1365-2966.2011.19179.x 　

ISSN： 0035-8711

eISSN： 1365-2966
Properties of star-forming galaxies in a cluster and its surrounding structure at z=1.46 Peer-reviewed

Masao Hayashi, Tadayuki Kodama, Yusei Koyama, Ken-ichi Tadaki, Ichi Tanaka

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　415　(3)　2670-2687　2011/08

DOI： 10.1111/j.1365-2966.2011.18892.x 　

ISSN： 0035-8711

eISSN： 1365-2966
RED STAR-FORMING GALAXIES AND THEIR ENVIRONMENT AT z=0.4 REVEALED BY PANORAMIC H alpha IMAGING Peer-reviewed

Yusei Koyama, Tadayuki Kodama, Fumiaki Nakata, Kazuhiro Shimasaku, Sadanori Okamura

ASTROPHYSICAL JOURNAL　734　(1)　2011/06

DOI： 10.1088/0004-637X/734/1/66 　

ISSN： 0004-637X

eISSN： 1538-4357
EARLY-TYPE GALAXIES AT z similar to 1.3. II. MASSES AND AGES OF EARLY-TYPE GALAXIES IN DIFFERENT ENVIRONMENTS AND THEIR DEPENDENCE ON STELLAR POPULATION MODEL ASSUMPTIONS Peer-reviewed

A. Raichoor, S. Mei, F. Nakata, S. A. Stanford, B. P. Holden, A. Rettura, M. Huertas-Company, M. Postman, P. Rosati, J. P. Blakeslee, R. Demarco, P. Eisenhardt, G. Illingworth, M. J. Jee, T. Kodama, M. Tanaka, R. L. White

ASTROPHYSICAL JOURNAL　732　(1)　2011/05

DOI： 10.1088/0004-637X/732/1/12 　

ISSN： 0004-637X
Discovery of an Excess of H alpha Emitters around 4C 23.56 at z=2.48 Peer-reviewed

Ichi Tanaka, Carlos De Breuck, Jaron D. Kurk, Yoshiaki Taniguchi, Tadayuki Kodama, Yuichi Matsuda, Chris Packham, Andrew Zirm, Masaru Kajisawa, Takashi Ichikawa, Nick Seymour, Daniel Stern, Alan Stockton, Bram P. Venemans, Joel Vernet

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN　63　S415-S435　2011/03

DOI： 10.1093/pasj/63.sp2.S415 　

ISSN： 0004-6264

eISSN： 2053-051X
Cosmic Star-Formation Activity at z=2.2 Probed by H alpha Emission-Line Galaxies Peer-reviewed

Ken-ichi Tadaki, Tadayuki Kodama, Yusei Koyama, Masao Hayash, Ichi Tanaka, Chihiro Ticcou

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN　63　S437-S446　2011/03

DOI： 10.1093/pasj/63.sp2.S437 　

ISSN： 0004-6264

eISSN： 2053-051X
Next generation AO system of Subaru Telescope

Yutaka Hayano, Masayuki Akiyama, Takashi Hattori, Ikuru Iwata, Tadayuki Kodama, Yosuke Minowa, Kentaro Motohara, Tetsuo Nishimura, Nagayoshi Ohashi, Yoshito Ohno, Shin Oya, Mai Shirahata, Hideki Takami, Naruhisa Takato, Naoyuki Tamura, Ichi Tanaka, Hiroshi Terada, Daigo Tomono, Tomonori Usuda

AO for ELT 2011 - 2nd International Conference on Adaptive Optics for Extremely Large Telescopes　2011
Publisher: Office National d'Etudes et de Recherches Aerospatiales, ONERA
STATISTICS OF 207 Ly alpha EMITTERS AT A REDSHIFT NEAR 7: CONSTRAINTS ON REIONIZATION AND GALAXY FORMATION MODELS Peer-reviewed

Masami Ouchi, Kazuhiro Shimasaku, Hisanori Furusawa, Tomoki Saito, Makiko Yoshida, Masayuki Akiyama, Yoshiaki Ono, Toru Yamada, Kazuaki Ota, Nobunari Kashikawa, Masanori Iye, Tadayuki Kodama, Sadanori Okamura, Chris Simpson, Michitoshi Yoshida

ASTROPHYSICAL JOURNAL　723　(1)　869-894　2010/11

DOI： 10.1088/0004-637X/723/1/869 　

ISSN： 0004-637X

eISSN： 1538-4357
A galaxy populations study of a radio-selected protocluster at z similar to 3.1 Peer-reviewed

E. Kuiper, N. A. Hatch, H. J. A. Rottgering, G. K. Miley, R. A. Overzier, B. P. Venemans, C. De Breuck, S. Croft, M. Kajisawa, T. Kodama, J. D. Kurk, L. Pentericci, S. A. Stanford, I. Tanaka, A. W. Zirm

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　405　(2)　969-986　2010/06

DOI： 10.1111/j.1365-2966.2010.16537.x 　

ISSN： 0035-8711

eISSN： 1365-2966
Environmental dependence of 8 μ m luminosity functions of galaxies at z ∼ 0.8: Comparison between RXJ1716.4+6708 and the AKARI NEP-deep field

T. Goto, Y. Koyama, T. Wada, C. Pearson, H. Matsuhara, T. Takagi, H. Shim, M. Im, M. G. Lee, H. Inami, M. Malkan, S. Okamura, T. T. Takeuchi, S. Serjeant, T. Kodama, T. Nakagawa, S. Oyabu, Y. Ohyama, H. M. Lee, N. Hwang, H. Hanami, K. Imai, T. Ishigaki

Astronomy and Astrophysics　514　(1)　2010/05/03

DOI： 10.1051/0004-6361/200913473 　

ISSN： 0004-6361

eISSN： 1432-0746
Panoramic H alpha and mid-infrared mapping of star formation in a z=0.8 cluster Peer-reviewed

Yusei Koyama, Tadayuki Kodama, Kazuhiro Shimasaku, Masao Hayashi, Sadanori Okamura, Ichi Tanaka, Chihiro Tokoku

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　403　(3)　1611-1624　2010/04

DOI： 10.1111/j.1365-2966.2009.16226.x 　

ISSN： 0035-8711

eISSN： 1365-2966
High star formation activity in the central region of a distant cluster at z=1.46 Peer-reviewed

Masao Hayashi, Tadayuki Kodama, Yusei Koyama, Ichi Tanaka, Kazuhiro Shimasaku, Sadanori Okamura

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　402　(3)　1980-1990　2010/03

DOI： 10.1111/j.1365-2966.2009.16026.x 　

ISSN： 0035-8711
Optical and near-IR spectroscopy of candidate red galaxies in two z similar to 2.5 proto-clusters Peer-reviewed

M. Doherty, M. Tanaka, C. De Breuck, C. Ly, T. Kodama, J. Kurk, N. Seymour, J. Vernet, D. Stern, B. Venemans, M. Kajisawa, I. Tanaka

ASTRONOMY & ASTROPHYSICS　509　2010/01

DOI： 10.1051/0004-6361/200912868 　

ISSN： 0004-6361
WISH: Wide-field Imaging Surveyor for High-redshift Peer-reviewed

Toru Yamada, Mamoru Doi, Tomotsugu Goto, Yuji Ikeda, Masatoshi Imanishi, Akio Inoue, Satoru Iwamura, Ikuru Iwata, Nobuyuki Kawai, Masakazu A. R. Kobayashi, Tadayuki Kodama, Yutaka Komiyama, Hideo Matsuhara, Yoshiki Matsuoka, Tomoki Morokuma, Kouji Ohta, Shinki Oyabu, Yoichi Sato, Hiroyuki Sugita, Ryo Tsutsui, Chihiro Tokoku, Saku Tsuneta, Takehiko Wada, Kiyoto Yabe, Naoki Yasuda, Daisuke Yonetoku

SPACE TELESCOPES AND INSTRUMENTATION 2010: OPTICAL, INFRARED, AND MILLIMETER WAVE　7731　2010

DOI： 10.1117/12.856561 　

ISSN： 0277-786X

eISSN： 1996-756X
Ly alpha blobs like company: the discovery of a candidate 100 kpc Ly alpha blob near to a radio galaxy with a giant Ly alpha halo B3 J2330+3927 at z=3.1

Y. Matsuda, Y. Nakamura, N. Morimoto, Ian Smail, C. De Breuck, K. Ohta, T. Kodama, A. K. Inoue, T. Hayashino, K. Kousai, E. Nakamura, M. Horie, T. Yamada, M. Kitamura, T. Saito, Y. Taniguchi, I. Tanaka, P. Hibon

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　400　(1)　L66-L70　2009/11

DOI： 10.1111/j.1745-3933.2009.00764.x 　

ISSN： 0035-8711

eISSN： 1365-2966
THE GREATER IMPACT OF MERGERS ON THE GROWTH OF MASSIVE GALAXIES: IMPLICATIONS FOR MASS ASSEMBLY AND EVOLUTION SINCE z similar or equal to 1 Peer-reviewed

Kevin Bundy, Masataka Fukugita, Richard S. Ellis, Thomas A. Targett, Sirio Belli, Tadayuki Kodama

ASTROPHYSICAL JOURNAL　697　(2)　1369-1383　2009/06

DOI： 10.1088/0004-637X/697/2/1369 　

ISSN： 0004-637X
DISCOVERY OF A GIANT Ly alpha EMITTER NEAR THE REIONIZATION EPOCH Peer-reviewed

Masami Ouchi, Yoshiaki Ono, Eiichi Egami, Tomoki Saito, Masamune Oguri, Patrick J. McCarthy, Duncan Farrah, Nobunari Kashikawa, Ivelina Momcheva, Kazuhiro Shimasaku, Kouichiro Nakanishi, Hisanori Furusawa, Masayuki Akiyama, James S. Dunlop, Angela M. J. Mortier, Sadanori Okamura, Masao Hayashi, Michele Cirasuolo, Alan Dressler, Masanori Iye, Matt J. Jarvis, Tadayuki Kodama, Crystal L. Martin, Ross J. McLure, Kouji Ohta, Toru Yamada, Michitoshi Yoshida

ASTROPHYSICAL JOURNAL　696　(2)　1164-1175　2009/05

DOI： 10.1088/0004-637X/696/2/1164 　

ISSN： 0004-637X

eISSN： 1538-4357
The space infrared telescope for cosmology and astrophysics: SPICA A joint mission between JAXA and ESA Peer-reviewed

Bruce Swinyard, Takao Nakagawa, Patrick Merken, Pierre Royer, Tim Souverijns, Bart Vandenbussche, Christoffel Waelkens, Peter Davis, James Di Francesco, Mark Halpern, Martin Houde, Doug Johnstone, Gilles Joncas, David Naylor, Rene Plume, Douglas Scott, A. Abergel, S. Bensammar, J. Braine, V. Buat, D. Burgarella, Ph. Cais, H. Dole, L. Duband, D. Elbaz, M. Gerin, M. Giard, J. Goicoechea, C. Joblin, A. Jones, J. P. Kneib, G. Lagache, S. Madden, R. Pons, F. Pajot, D. Rambaud, L. Ravera, I. Ristorcelli, L. Rodriguez, S. Vives, A. Zavagno, Norbert Geis, Oliver Krause, Dieter Lutz, Albrecht Poglitsch, Walfried Raab, Jutta Stegmaier, Eckhard Sturm, Richard Tuffs, Hyung Mok Lee, Bon-Chul Koo, Myungshin Im, Soojong Pak, Wonyong Han, Jang-Hyun Park, Uk-Won Nam, Ho Jin, Dae-Hee Lee, In-Soo Yuk, Sungho Lee, Yuri Aikawa, Nobuo Arimoto, Yasuo Doi, Keigo Enya, Misato Fukagawa, Reiko Furusho, Sunao Hasegawa, Masahiko Hayashi, Mitsuhiko Honda, Shigeru Ida, Masatoshi Imanishi, Shu-ichiro Inutsuka, Hideyuki Izumiura, Hideyuki Kamaya, Hidehiro Kaneda, Toshihiro Kasuga, Hirokazu Kataza, Koji Kawabata, Mitsunobu Kawada, Hideyo Kawakita, Tsuneo Kii, Jin Koda, Tadayuki Kodama, Eiichiro Kokubo, Keiji Komatsu, Hideo Matsuhara, Toshio Matsumoto, Shuji Matsuura, Takashi Miyata, Hiroshi Murakam, Hirohisa Nagata, Tetsuya Nagata, Tadashi Nakajima, Kobayashi Naoto, Ryoichi Nishi, Atsushi Noda, Atsushi Okamoto, Yoshiko K. Okamoto, Kazuyuki Omukai, Takashi Onaka, Takafumi Ootsubo, Masami Ouchi, Hirobumi Saito, Yoichi Sato, Shigeyuki Sako, Tomohiko Sekiguchi, Hiroshi Shibai, Hiroyuki Sugita, Koji Sugitani, Hajime Susa, Pyo Tae-soo, Motohide Tamura, Yoshihiro Ueda, Munetaka Ueno, Takehiko Wada, Jun'ichi Watanabe, Toru Yamada, Issei Yamamura, Naoki Yoshida, Kitamura Yoshimi, Yukari Yui, Milena Benedettini, Riccardo Cerulli, Anna Di Giorgio, Sergio Molinari, Renato Orfei, Stefano Pezzuto, Lorenzo Piazzo, Paolo Saraceno, Luigi Spinoglio, Thijs de Graauw, Piet de Korte, Frank Helmich, Henk Hoevers, Robert Huisman, Russell Shipman, Floris van der Tak, Paul van der Werf, Wolfgang Wild, Jose Acosta-Pulido, Jose Cernicharo, Jose Herreros, Jesus Martin-Pintado, Francisco Najarro, Ismael Perez-Fourmon, Juan Ramon Pardo, Francisca Gomez, Nieves Castro Rodriguez, Peter Ade, Mike Barlow, David Clements, Marc Ferlet, Helen Fraser, Douglas Griffin, Matthew Griffin, Peter Hargrave, Kate Isaak, Robert Ivison, Malik Mansour, Jonathan Laniesse, Phillip Mauskopf, Dmitry Morozov, Seb Oliver, Angiola Orlando, Mathew Page, Cristina Popescu, Stephen Serjeant, Rashmi Sudiwala, Dimitra Rigopoulou, Ian Walker, Glenn White, Serena Viti, Berend Winter, Jamie Bock, Matt Bradford, Martin Harwit, Warren Holmes

EXPERIMENTAL ASTRONOMY　23　(1)　193-219　2009/03

DOI： 10.1007/s10686-008-9090-0 　

ISSN： 0922-6435

eISSN： 1572-9508
Photometric H alpha and [O II] Luminosity Function of SDF and SXDF Galaxies: Implications for Future Baryon Oscillation Surveys Peer-reviewed

Sumiyoshi} Masanao, Totani} Tomonori, Oshige} Shunsuke, Glazebrook} Karl, Akiyama} Masayuki, Morokuma} Tomoki, Motohara} Kentaro, Shimasaku} Kazuhiro, Hayashi} Masao, Yoshida} Makiko, Kashikawa} Nobunari, Kodama} Tadayuki

arXiv e-prints　arXiv:0902.2064　2009
VizieR Online Data Catalog: Subaru/XMM-Newton deep survey IV. (SXDS) (Ouchi+, 2008) Peer-reviewed

Ouchi} M, Shimasaku} K, Akiyama} M, Simpson} C, Saito} T, Ueda} Y, Furusawa} H, Sekiguchi} K, Yamada} T, Kodama} T, Kashikawa} N, Okamura} S, Iye} M, Takata} T, Yoshida} M, Yoshida} M

VizieR Online Data Catalog　J/ApJS/176/301　2009
Unveiling the Hidden Star Formation Activity in and around Distant Clusters of Galaxies with AKARI Peer-reviewed

Yusei Koyama, Tadayuki Kodama

AKARI, A LIGHT TO ILLUMINATE THE MISTY UNIVERSE　418　251-+　2009
Mapping dusty star formation in and around a cluster at z=0.81 by wide-field imaging with AKARI Peer-reviewed

Yusei Koyama, Tadayuki Kodama, Kazuhiro Shimasaku, Sadanori Okamura, Masayuki Tanaka, Hyung Mok Lee, Myungshin Im, Hideo Matsuhara, Toshinobu Takagi, Takehiko Wada, Shinki Oyabu

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　391　(4)　1758-1770　2008/12

DOI： 10.1111/j.1365-2966.2008.13931.x 　

ISSN： 0035-8711

eISSN： 1365-2966
The Subaru/XMM-Newton Deep Survey (SXDS). IV. Evolution of Ly alpha emitters from z=3.1 to 5.7 in the 1 deg(2) field: Luminosity functions and AGN Peer-reviewed

Masami Ouchi, Kazuhiro Shimasaku, Masayuki Akiyama, Chris Simpson, Tomoki Saito, Yoshihiro Ueda, Hisanori Furusawa, Kazuhiro Sekiguchi, Toru Yamada, Tadayuki Kodama, Nobunari Kashikawa, Sadanori Okamura, Masanori Iye, Tadafumi Takata, Michitoshi Yoshida, Makiko Yoshida

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES　176　(2)　301-330　2008/06

DOI： 10.1086/527673 　

ISSN： 0067-0049

eISSN： 1538-4365
The Subaru/XMM-Newton deep survey (SXDS). II. Optical imaging and photometric catalogs Peer-reviewed

Hisanori Furusawa, George Kosugi, Masayuki Akiyama, Tadafumi Takata, Kazuhiro Sekiguchi, Ichi Tanaka, Ikuru Iwata, Masaru Kajisawa, Naoki Yasuda, Mamoru Doi, Masami Ouchi, Chris Simpson, Kazuhiro Shimasaku, Toru Yamada, Junko Furusawa, Tomoki Morokuma, Catherine M. Ishida, Kentaro Aoki, Tetsuharu Fuse, Masatoshi Imanishi, Masanori Iye, Hiroshi Karoji, Naoto Kobayashi, Tadayuki Kodama, Yutaka Komiyama, Yoshitomo Maeda, Satoshi Miyazaki, Yoshihiko Mizumoto, Fumiaki Nakata, Jun'ichi Noumaru, Ryusuke Ogasawara, Sadanori Okamura, Tomoki Saito, Toshiyuki Sasaki, Yoshihiro Ueda, Michitoshi Yoshida

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES　176　(1)　1-18　2008/05

DOI： 10.1086/527321 　

ISSN： 0067-0049

eISSN： 1538-4365
Deep- and Wide-field K-band Imaging of the Subaru Deep Field: Implications for Galaxy Formation at z~2

Motohara, K, Hayashi, M, Shimasaku, K, Yoshida, M, Kashikawa, N, Kodama, T

Panoramic Views of Galaxy Formation and Evolution　399　274　2008
Dark-Halo Masses, Star Formation Rates, and Stellar Masses of High-Redshift Galaxies Peer-reviewed

Kazuhiro Shimasaku, Masao Hayashi, Kentaro Motohara, Sadanori Okamura, Makiko Yoshida, Nobunari Kashikawa, Tadayuki Kodama, Masami Ouchi

PANORAMIC VIEWS OF GALAXY FORMATION AND EVOLUTION, PROCEEDINGS　399　75-81　2008
Proto-Clusters at z >> 1 as the Site of Early-Type Galaxies Formation Peer-reviewed

Tadayuki Kodama

PANORAMIC VIEWS OF GALAXY FORMATION AND EVOLUTION, PROCEEDINGS　399　305-313　2008
Panoramic and Multi-Wavelength Study of the Distant Cluster RXJ1716 at z=0.81 Peer-reviewed

Yusei Koyama, Tadayuki Kodama, Masayuki Tanaka, Kazuhiro Shimasaku, Sadanori Okamura

PANORAMIC VIEWS OF GALAXY FORMATION AND EVOLUTION, PROCEEDINGS　399　361-+　2008
Spectroscopic Study of Galaxies within the Structure around Cl 0939+4713 Peer-reviewed

Fumiaki Nakata, Tadayuki Kodama, Masayuki Tanaka

PANORAMIC VIEWS OF GALAXY FORMATION AND EVOLUTION, PROCEEDINGS　399　371-+　2008
Testing the Target Selection for Future Spectroscopic BAO Surveys by SDF and SXDS Data Peer-reviewed

Masanao Sumiyoshi, Shunsuke Oshige, Tomonori Totani, Karl Glazebrook, Masayuki Akiyama, Tomoki Morokuma, Kentaro Motohara, Kazuhiro Shimasaku, Makiko Yoshida, Masao Hayashi, Nobunari Kashikawa, Tadayuki Kodama

PANORAMIC VIEWS OF GALAXY FORMATION AND EVOLUTION, PROCEEDINGS　399　487-+　2008
Galaxy evolution viewed as functions of environment and mass Peer-reviewed

Tadayuki Kodama, Masayuki Tanaka, Ichi Tanaka, Masaru Kajisawa

MAPPING THE GALAXY AND NEARBY GALAXIES　296-+　2008

DOI： 10.1007/978-0-387-72768-4_43 　

ISSN： 1570-6591
Dependence of the build-up of the colour-magnitude relation on cluster richness at z similar to 0.8 Peer-reviewed

Yusei Koyama, Tadayuki Kodama, Masayuki Tanaka, Kazuhiro Shimasaku, Sadanori Okamura

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　382　(4)　1719-1728　2007/12

DOI： 10.1111/j.1365-2966.2007.12445.x 　

ISSN： 0035-8711

eISSN： 1365-2966
A huge filamentary structure at z=0.55 and star formation histories of galaxies at z < 1 Peer-reviewed

Masayuki Tanaka, Takako Hoshi, Tadayuki Kodama, Nobunari Kashikawa

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　379　(4)　1546-1556　2007/08

DOI： 10.1111/j.1365-2966.2007.12062.x 　

ISSN： 0035-8711

eISSN： 1365-2966
The first appearance of the red sequence of galaxies in proto-clusters at 2 less than or similar to z less than or similar to 3 Peer-reviewed

Tadayuki Kodama, Ichi Tanaka, Masaru Kajisawa, Jaron Kurk, Bram Venemans, Carlos De Breuck, Joel Vernet, Chris Lidman

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　377　(4)　1717-1725　2007/06

DOI： 10.1111/j.1365-2966.2007.11739.x 　

ISSN： 0035-8711
A deficit of faint red galaxies in the possible large-scale structures around the RDCS J1252.9-2927 cluster at z=1.24 Peer-reviewed

Masayuki Tanaka, Tadayuki Kodama, Masaru Kajisawa, Richard Bower, Ricardo Demarco, Alexis Finoguenov, Chris Lidman, Piero Rosati

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　377　(3)　1206-1214　2007/05

DOI： 10.1111/j.1365-2966.2007.11671.x 　

ISSN： 0035-8711

eISSN： 1365-2966
The number density of old passively-evolving galaxies at z = 1 in the Subaru/XMM-Newton deep survey field (vol 634, pg 861, 2005) Peer-reviewed

Toru Yamada, Tadayuki Kodama, Masayuki Akiyama, Hisanori Furusawa, Ikuru Iwata, Masaru Kajisawa, Masanori Iye, Masami Ouchi, Kazuhiro Sekiguchi, Kazuhiro Shimasaku, Chris Simpson, Ichi Tanaka, Michitoshi Yoshida

ASTROPHYSICAL JOURNAL　659　(1)　862-862　2007/04

DOI： 10.1086/510327 　

ISSN： 0004-637X
The Luminosity Function and Star Formation Rate between Redshifts of 0.07 and 1.47 for Narrowband Emitters in the Subaru Deep Field Peer-reviewed

Ly, Chun, Malkan, Matt A., Kashikawa, Nobunari, Shimasaku, Kazuhiro, Doi, Mamoru, Nagao, Tohru, Iye, Masanori, Kodama, Tadayuki, Morokuma, Tomoki, Motohara, Kentaro

The Astrophysical Journal　657　(2)　738-759　2007/03/10

DOI： 10.1086/510828 　

ISSN： 1538-4357
The luminosity function and star formation rate between redshifts of 0.07 and 1.47 for narrowband emitters in the subaru deep field Peer-reviewed

Chun Ly, Matt A. Malkan, Nobunari Kashikawa, Kazuhiro Shimasaku, Mamoru Doi, Tohru Nagao, Masanori Iye, Tadayuki Kodama, Tomoki Morokuma, Kentaro Motohara

ASTROPHYSICAL JOURNAL　657　(2)　738-759　2007/03

DOI： 10.1086/510828 　

ISSN： 0004-637X

eISSN： 1538-4357
Errata : The SUBARU Deep Field Project: Lyman α Emitters at a Redshift of 6.6 Peer-reviewed

Taniguchi, Yoshiaki, Ajiki, Msaru, Nagao, Tohru, Shioya, Yasuhiro, Murayama, Takashi, Kashikawa, Nobunari, Kodaira, Keiichi, Kaifu, Norio, Ando, Hiroyasu, Karoji, Hiroshi, Akiyama, Masayuki, Aoki, Kentaro, Doi, Mamoru, Fujita, Shinobu S., Furusawa, Hisanori, Hayashino, Tomoki, Iwamuro, Furnihide, Iye, Masanori, Kobayashi, Naoto, Kodama, Tadayuki, Komiyama, Yutaka, Matsuda, Yuichi, Miyazaki, Satoshi, Mizumoto, Yoshihiko, Morokuma, Tomoki, Motohara, Kentaro, Nariai, Kyoji, Ohta, Koji, Ohyama, Youichi, Okamura, Sadanori, Ouchi, Masami, Sasaki, Toshiyuki, Sato, Yasunori, Sekiguchi, Kazuhiro, Shimasaku, Kazuhiro, Tamura, Hajime, Umemura, Masayuki, Yamada, Toru, Yasuda, Naoki, Yoshida, Michitoshi

Publications of the Astronomical Society of Japan　59　(1)　277-277　2007/02/25

DOI： 10.1093/pasj/59.1.277 　

ISSN： 2053-051X
The SUBARU deep field project: Lyman alpha emitters at a redshift of 6.6 (vol 57, pg 165, 2005) Peer-reviewed

Yoshiaki Taniguchi, Msaru Ajiki, Tohru Nagao, Yasuhiro Shioya, Takashi Murayama, Nobunari Kashikawa, Keiichi Kodaira, Norio Kaifu, Hiroyasu Ando, Hiroshi Karoji, Masayuki Akiyama, Kentaro Aoki, Mamoru Doi, Shinobu S. Fujita, Hisanori Furusawa, Tomoki Hayashino, Furnihide Iwamuro, Masanori Iye, Naoto Kobayashi, Tadayuki Kodama, Yutaka Komiyama, Yuichi Matsuda, Satoshi Miyazaki, Yoshihiko Mizumoto, Tomoki Morokuma, Kentaro Motohara, Kyoji Nariai, Koji Ohta, Youichi Ohyama, Sadanori Okamura, Masami Ouchi, Toshiyuki Sasaki, Yasunori Sato, Kazuhiro Sekiguchi, Kazuhiro Shimasaku, Hajime Tamura, Masayuki Umemura, Toru Yamada, Naoki Yasuda, Michitoshi Yoshida

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN　59　(1)　277-277　2007/02

DOI： 10.1093/pasj/59.1.277 　

ISSN： 0004-6264

eISSN： 2053-051X
Proto-Clusters with Evolved Populations around Radio Galaxies at 2 < z < 3 Peer-reviewed

Tadayuki Kodama, Masayuki Tanaka, Ichi Tanaka, Masaru Kajisawa

COSMIC FRONTIERS　379　202-+　2007
Luminosity functions of lyman break galaxies at z similar to 4 and z similar to 5 in the Subaru Deep Field Peer-reviewed

Makiko Yoshida, Kazuhiro Shimasaku, Nobunari Kashikawa, Masami Ouchi, Sadanori Okamura, Masaru Ajiki, Masayuki Akiyama, Hiroyasu Ando, Kentaro Aoki, Mamoru Doi, Hisanori Furusawa, Tomoki Hayashino, Fumihide Iwamuro, Masanori Iye, Hiroshi Karoji, Naoto Kobayashi, Keiichi Kodaira, Tadayuki Kodama, Yutaka Komiyama, Matthew A. Malkan, Yuichi Matsuda, Satoshi Miyazaki, Yoshihiko Mizumoto, Tomoki Morokuma, Kentaro Motohara, Takashi Murayama, Tohru Nagao, Kyoji Nariai, Kouji Ohta, Toshiyuki Sasaki, Yasunori Sato, Kazuhiro Sekiguchi, Yasuhiro Shioya, Hajime Tamura, Yoshiaki Taniguchi, Masayuki Umemura, Toru Yamada, Naoki Yasuda

ASTROPHYSICAL JOURNAL　653　(2)　988-1003　2006/12

DOI： 10.1086/508621 　

ISSN： 0004-637X

eISSN： 1538-4357
Protoclusters with evolved populations around radio galaxies at z similar to 2.5 Peer-reviewed

Masaru Kajisawa, Tadayuki Kodama, Ichi Tanaka, Toru Yamada, Richard Bower

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　371　(2)　577-582　2006/09

DOI： 10.1111/j.1365-2966.2006.10704.x 　

ISSN： 0035-8711

eISSN： 1365-2966
The build-up of the colour-magnitude relation Peer-reviewed

Masayuki Tanaka, Tadayuki Kodama

Proceedings of the International Astronomical Union　2　(235)　141　2006/08

DOI： 10.1017/S1743921306005734 　

ISSN： 1743-9213 1743-9221
Panoramic views of cluster evolution since z = 3 Peer-reviewed

Tadayuki Kodama, M. Tanaka, Ichi Tanaka, M. Kajisawa

Proceedings of the International Astronomical Union　2　(235)　170-171　2006/08

DOI： 10.1017/S1743921306005886 　

ISSN： 1743-9213 1743-9221
Deep extragalactic surveys around the ecliptic poles with AKARI (ASTRO-F) Peer-reviewed

Hideo Matsuhara, Takehiko Wada, Shuji Matsuura, Takao Nakagawa, Mitsunobu Kawada, Youichi Ohyama, Chris P. Pearson, Shinki Oyabu, Toshinobu Takagi, Stephen Serjeant, Glenn J. White, Hitoshi Hanami, Hidenori Watarai, Tsutomu T. Takeuchi, Tadayuki Kodama, Nobuo Arimoto, Sadanori Okamura, Hyung Mok Lee, Soojong Pak, Myung Shin Im, Myung Gyoon Lee, Woojung Kim, Woong-Seob Jeong, Koji Imai, Naofumi Fujishiro, Mai Shirahata, Toyoaki Suzuki, Chiaki Ihara, Itsuki Sakons

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN　58　(4)　673-694　2006/08

DOI： 10.1093/pasj/58.4.673 　

ISSN： 0004-6264

eISSN： 2053-051X
Masses of high-z galaxy hosting haloes from angular clustering and their evolution in the cold dark matter model Peer-reviewed

Takashi Hamana, Toru Yamada, Masami Ouchi, Ikuru Iwata, Tadayuki Kodama

Monthly Notices of the Royal Astronomical Society　369　(4)　1929-1938　2006/07

DOI： 10.1111/j.1365-2966.2006.10472.x 　

ISSN： 0035-8711 1365-2966
The build-up of the colour-magnitude relation as a function of environment (vol 362, pg 268, 2005)

M Tanaka, T Kodama, N Arimoto, S Okamura, K Umetsu, K Shimasaku, Tanaka, I, T Yamada

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　366　(4)　1551-1552　2006/03

DOI： 10.1111/j.1365-2966.2006.10001.x 　

ISSN： 0035-8711
Spectroscopically confirmed large-scale structures associated to a z = 0.83 cluster Peer-reviewed

Masayuki Tanaka, Tadayuki Kodama, Nobuo Arimoto, Ichi Tanaka

Monthly Notices of the Royal Astronomical Society　365　(4)　1392-1404　2006/02

DOI： 10.1111/j.1365-2966.2005.09841.x 　

ISSN： 0035-8711 1365-2966
Clustering of Lyman break galaxies at z=4 and 5 in the Subaru Deep Field: Luminosity dependence of the correlation function slope Peer-reviewed

Kashikawa, N, Yoshida, M, Shimasaku, K, Nagashima, M, Yahagi, H, Ouchi, M, Matsuda, Y, Malkan, MA, Doi, M, Iye, M, Ajiki, M, Akiyama, M, Ando, H, Aoki, K, Furusawa, H, Hayashino, T, Iwamuro, F, Karoji, H, Kobayashi, N, Kodaira, K, Kodama, T, Komiyama, Y, Miyazaki, S, Mizumoto, Y, Morokuma, T, Motohara, K, Murayama, T, Nagao, T, Nariai, K, Ohta, K, Okamura, S, Sasaki, T, Sato, Y, Sekiguchi, K, Shioya, Y, Tamura, H, Taniguchi, Y, Umemura, M, Yamada, T, Yasuda, N

Astrophysical Journal　637　(2)　631-647　2006

DOI： 10.1086/498403 　
The build-up of the colour-magnitude relation as a function of environment Peer-reviewed

Masayuki Tanaka, Tadayuki Kodama, Nobuo Arimoto, Sadanori Okamura, Keiichi Umetsu, Kazuhiro Shimasaku, Ichi Tanaka, Toru Yamada

Monthly Notices of the Royal Astronomical Society　362　(1)　268-288　2005/09/01

DOI： 10.1111/j.1365-2966.2005.09300.x 　

ISSN： 0035-8711
The SUBARU Deep Field Project: Lymanα Emitters at a Redshift of 6.6 Peer-reviewed

Taniguchi, Y, Ajiki, M, Nagao, T, Shioya, Y, Murayama, T, Kashikawa, N, Kodaira, K, Kaifu, N, Ando, H, Karoji, H, Akiyama, M, Aoki, K, Doi, M, Fujita, S. S, Furusawa, H, Hayashino, T, Iwamuro, F, Iye, M, Kobayashi, N, Kodama, T, Komiyama, Y, Matsuda, Y, Miyazaki, S, Mizumoto, Y, Morokuma, T, Motohara, K, Nariai, K, Ohta, K, Ohyama, Y, Okamura, S, Ouchi, M, Sasaki, T, Sato, Y, Sekiguchi, K, Shimasaku, K, Tamura, H, Umemura, M, Yamada, T, Yasuda, N, Yoshida, M

Publications of the Astronomical Society of Japan　57　165-182　2005/02/25

DOI： 10.1093/pasj/57.1.165 　

ISSN： 2053-051X
Galaxy evolution in three dimensions: Time, space and mass

T Kodama, R Bower, P Best, P Hall, T Yamada, M Tanaka

Multiwavelength Mapping of Galaxy Formation and Evolution　279-284　2005

DOI： 10.1007/10995020_42 　
The Discovery of Primeval Large-Scale Structures with Forming Clusters at Redshift 6 Peer-reviewed

Ouchi} Masami, Shimasaku} Kazuhiro, Akiyama} Masayuki, Sekiguchi} Kazuhiro, Furusawa} Hisanori, Okamura} Sadanori, Kashikawa} Nobunari, Iye} Masanori, Kodama} Tadayuki, Saito} Tomoki, Sasaki} Toshiyuki, Simpson} Chris, Takata} Tadafumi, Yamada} Toru, Yamanoi} Hitomi, Yoshida} Makiko, Yoshida} Michitoshi

\apjl　620　(1)　L1-L4　2005

DOI： 10.1086/428499 　

ISSN： 0004-637X
Panoramic Views of Cluster-Scale Assemblies Explored by Subaru Wide-Field Imaging Peer-reviewed

Kodama} Tadayuki, Tanaka} Masayuki, Tamura} Takayuki, Yahagi} Hideki, Nagashima} Masahiro, Tanaka} Ichi, Arimoto} Nobuo, Futamase} Toshifumi, Iye} Masanori, Karasawa} Yoshikazu, Kashikawa} Nobunari, Kawasaki} Wataru, Kitayama} Tetsu, Matsuhara} Hideo, Nakata} Fumiaki, Ohashi} Takaya, Ohta} Kouji, Okamoto} Takashi, Okamura} Sadanori, Shimasaku} Kazuhiro, Suto} Yasushi, Tamura} Naoyuki, Umetsu} Keiichi, Yamada} Toru

\pasj　57　(2)　309-323　2005

DOI： 10.1093/pasj/57.2.309 　

ISSN： 0004-6264

eISSN： 2053-051X
Discovery of a Strongly Lensed Galaxy at z=3.9 behind a z=0.83 Galaxy Cluster Peer-reviewed

Umetsu} Keiichi, Tanaka} Masayuki, Kodama} Tadayuki, Tanaka} Ichi, Futamase} Toshifumi, Kashikawa} Nobunari, Hoshi} Takako

\pasj　57　(6)　877-880　2005
Publisher:
DOI： 10.1093/pasj/57.6.877 　

ISSN： 0004-6264
Cosmic Evolution of Dust and Star Formation: Emission Line Galaxies in the Subaru Deep Field Peer-reviewed

Malkan} Matthew, Iye} Masanori, Kashikawa, Nobunari, Kodama} Tadayuki, Motohara} Kentaro, Shimasaku} Kazu

20229　2005
The Number Density of Old Passively Evolving Galaxies atz = 1 in the Subaru/XMM‐NewtonDeep Survey Field Peer-reviewed

Toru Yamada, Tadayuki Kodama, Masayuki Akiyama, Hisanori Furusawa, Ikuru Iwata, Masaru Kajisawa, Masanori Iye, Masami Ouchi, Kazuhiro Sekiguchi, Kazuhiro Shimasaku, Chris Simpson, Ichi Tanaka, Michitoshi Yoshida

The Astrophysical Journal　634　(2)　861-878　2005

DOI： 10.1086/496954 　

ISSN： 0004-637X

eISSN： 1538-4357
The Subaru Deep Field: The Optical Imaging Data Peer-reviewed

Kashikawa, N, Shimasaku, K, Yasuda, N, Ajiki, M, Akiyama, M, Ando, H, Aoki, K, Doi, M, Fujita, S. S, Furusawa, H, Hayashino, T, Iwamuro, F, Iye, M, Karoji, H, Kobayashi, N, Kodaira, K, Kodama, T, Komiyama, Y, Matsuda, Y, Miyazaki, S, Mizumoto, Y, Morokuma, T, Motohara, K, Murayama, T, Nagao, T, Nariai, K, Ohta, K, Okamura, S, Ouchi, M, Sasaki, T, Sato, Y, Sekiguchi, K, Shioya, Y, Tamura, H, Taniguchi, Y, Umemura, M, Yamada, T, Yoshida, M

Publications of the Astronomical Society of Japan　56　1011-1023　2004/12/25

DOI： 10.1093/pasj/56.6.1011 　

ISSN： 2053-051X
A slow merger history of field galaxies since z ∼ 1

Kevin Bundy, Masataka Fukugita, Richard S. Ellis, Tadayuki Kodama, Christopher J. Conselice

Astrophysical Journal　601　(2)　L123-L126　2004/02/01
Publisher: Institute of Physics Publishing
DOI： 10.1086/381891 　

ISSN： 1538-4357 0004-637X
PISCES: Galaxy properties as functions of environment and time

Masayuki Tanaka, Tadayuki Kodama

Proceedings of Science　2004-　2004
Publisher: Sissa Medialab Srl
ISSN： 1824-8039
ERO R1 in the field of CL0939+4713 - Evidence for an SO-like galaxy at z similar to 1.5 Peer-reviewed

M Iye, N Kashikawa, M Imanishi, T Kodama, M Chiba, K Shimasaku, S Okamura, S Miyazaki, C Simpson, N Kobayashi, H Terada, M Goto, F Iwamuro

DARK MATTER IN GALAXIES　220　(220)　181-182　2004

ISSN： 0074-1809
Optical spectropolarimetry of SN 2002ap with Subaru telescope Peer-reviewed

Kawabata, S. Koji, Jeffery} D.~J, Iye} Masanori, Kashikawa} Nobunari, Saito} Yoshihiko, Misawa} Toru, Yamada} Toru, Tanaka} Ichi, Ohyama} Youichi, Kosugi} George, Sasaki} Toshiyuki, Sekiguchi} Kazuhiro, Aoki} Kentaro, Takata} Tadafumi, Ebizuka} Noboru, Nomoto} Ken'ichi, Mazzali} Paolo, Deng} Jinsong, Maeda} Keiichi, Umeda} Hideyuki, Ota} Kazuaki, Yoshida} Michitoshi, Inata} Motoko, Okita} Kiichi, Shimizu} Yasuhiro, Asai} Ryo, Ozawa} Tomohiko, Yadoumaru} Yasushi, Taguchi} Hiroko, Nakata} Fumiaki, Kodama} Tadayuki

In: Annual Report of the National Astronomical Observatory of Japan, Volume 5, Fiscal 2002. Eds.: Kiyotaka Tanikawa, Masatoshi Imanishi, Makoto Miyoshi, Toshiya Muramatsu, Takashi Sekii, Mitsuru Ŝoma, Akitoshi Ueda, Yoshiko Yamashita, Naoki Yasuda, Natio　5　22　2004
A strong Ly alpha emitter at z=6.33 in the Subaru Deep Field selected as an i '-dropout Peer-reviewed

Nagao, T, Taniguchi, Y, Kashikawa, N, Kodaira, K, Kaifu, N, Ando, H, Karoji, H, Ajiki, M, Akiyama, M, Aoki, K, Fujita, SS, Furusawa, H, Hayashino, T, Iwamuro, F, Iye, M, Kobayashi, N, Kodama, T, Komiyama, Y, Matsuda, Y, Miyazaki, S, Mizumoto, Y, Morokuma, T, Motohara, K, Murayama, T, Nariai, K, Ohta, K, Okamura, S, Ouchi, M, Sasaki, T, Sato, Y, Sekiguchi, K, Shimasaku, K, Shioya, Y, Tamura, H, Tanaka, I, Umemura, M, Yamada, T, Yasuda, N, Yoshida, M

Astrophysical Journal　613　(1)　L9-L12　2004

DOI： 10.1086/424965 　
Evolution of elliptical galaxies at z > similar to 1 revealed from a large, multicolor sample of extremely red objects Peer-reviewed

M Miyazaki, K Shimasaku, T Kodama, S Okamura, H Furusawa, M Ouchi, F Nakata, M Doi, M Hamabe, M Kimura, Y Komiyama, S Miyazaki, C Nagashima, T Nagata, T Nagayama, Y Nakajima, H Nakaya, AJ Pickles, S Sato, K Sekiguchi, M Sekiguchi, K Sugitani, T Takata, M Tamura, M Yagi, N Yasuda

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN　55　(6)　1079-1103　2003/12

DOI： 10.1093/pasj/55.6.1079 　

ISSN： 0004-6264

eISSN： 2053-051X
The K s-band luminosity and stellar mass functions of galaxies in z ∼ 1 clusters Peer-reviewed

Tadayuki Kodama, Richard Bower

Monthly Notices of the Royal Astronomical Society　346　(1)　1-12　2003/11/21

DOI： 10.1046/j.1365-2966.2003.07093.x 　

ISSN： 0035-8711
ERO R1 in the field of CL 0939+4713: Evidence for an S0-like galaxy at z similar to 1.5 Peer-reviewed

M Iye, K Shimasaku, S Miyazaki, C Simpson, M Imanishi, N Kashikawa, T Kodama, M Chiba, Y Saito, M Goto, F Iwamuro, N Kobayashi, S Okamura, H Terada

ASTROPHYSICAL JOURNAL　590　(2)　770-777　2003/06

ISSN： 0004-637X

eISSN： 1538-4357
ERO R1 in the Field of CL 0939+4713: Evidence for an S0-like Galaxy at z ̊aisebox-0.5ex~ 1.5 Peer-reviewed

Iye} Masanori, Shimasaku} Kazuhiro, Miyazaki} Satoshi, Simpson} Chris, Imanishi} Masatoshi, Kashikawa} Nobunari, Kodama} Tadayuki, Chiba} Masashi, Saito} Yoshihiko, Goto} Miwa, Iwamuro} Fumihide, Kobayashi} Naoto, Okamura} Sadanori, Terada} Hiroshi

\apj　590　(2)　770-777　2003/06
Publisher: {IOP} Publishing
DOI： 10.1086/375146 　

ISSN： 0004-637X
The Discovery of Two Lyman α Emitters beyond Redshift 6 in the Subaru Deep Field, Peer-reviewed

Kodaira, K, Taniguchi, Y, Kashikawa, N, Kaifu, N, Ando, H, Karoji, H, Ajiki, M, Akiyama, M, Aoki, K, Doi, M, Fujita, S. S, Furusawa, H, Hayashino, T, Imanishi, M, Iwamuro, F, Iye, M, Kawabata, K. S, Kobayashi, N, Kodama, T, Komiyama, Y, Kosugi, G, Matsuda, Y, Miyazaki, S, Mizumoto, Y, Motohara, K, Murayama, T, Nagao, T, Nariai, K, Ohta, K, Ohyama, Y, Okamura, S, Ouchi, M, Sasaki, T, Sekiguchi, K, Shimasaku, K, Shioya, Y, Takata, T, Tamura, H, Terada, H, Umemura, M, Usuda, T, Yagi, M, Yamada, T, Yasuda, N, Yoshida, M

Publications of the Astronomical Society of Japan　55　L17-L21　2003/04/25

DOI： 10.1093/pasj/55.2.l17 　

ISSN： 2053-051X
Optical Spectropolarimetry of SN 2002[CLC]ap[/CLC]: A High-Velocity Asymmetric Explosion Peer-reviewed

K. S. Kawabata, D. J. Jeffery, M. Iye, Y. Ohyama, G. Kosugi, N. Kashikawa, N. Ebizuka, T. Sasaki, K. Sekiguchi, K. Nomoto, P. Mazzali, J. Deng, K. Maeda, H. Umeda, K. Aoki, Y. Saito, T. Takata, M. Yoshida, R. Asai, M. Inata, K. Okita, K. Ota, T. Ozawa, Y. Shimizu, H. Taguchi, Y. Yadoumaru, T. Misawa, F. Nakata, T. Yamada, I. Tanaka, T. Kodama

The Astrophysical Journal　580　(1)　L39-L42　2002/11

DOI： 10.1086/345545 　

ISSN： 0004-637X

eISSN： 1538-4357
Witnessing the hierarchical assembly of the brightest cluster galaxy in a cluster at z = 1.26 Peer-reviewed

Toru Yamada, Yohei Koyama, Fumiaki Nakata, Masaru Kajisawa, Ichi Tanaka, Tadayuki Kodama, Sadanori Okamura, Roberto De Propris

Astrophysical Journal　577　(2)　L89-L92　2002/10/01
Publisher: Institute of Physics Publishing
DOI： 10.1086/344400 　

ISSN： 1538-4357 0004-637X
The Las Campanas/AAT Rich Cluster Survey - II. The environmental dependence of galaxy colours in clusters at z ∼ 0.1 Peer-reviewed

Kevin A. Pimbblet, Ian Smail, Tadayuki Kodama, Warrick J. Couch, Alastair C. Edge, Ann I. Zabludoff, Eileen O'Hely

Monthly Notices of the Royal Astronomical Society　331　(2)　333-349　2002/04/01

DOI： 10.1046/j.1365-8711.2002.05186.x 　

ISSN： 0035-8711
Galaxy population in the cluster of galaxies around the radio galaxy 3C324 at z=1.2

F Nakata, M Kajisawa, T Yamada, T Kodama, K Shimasaku, Tanaka, I, M Doi, H Furusawa, M Hamabe, M Iye, M Kimura, Y Komiyama, S Miyazaki, S Okamura, M Ouchi, T Sasaki, M Sekigushi, M Yagi, N Yasuda

TRACING COSMIC EVOLUTION WITH GALAXY CLUSTERS, PROCEEDINGS　268　421-422　2002
Testing the hypothesis of the morphological transformation from field spiral to cluster S0 Peer-reviewed

Tadayuki Kodama, Ian Smail

Monthly Notices of the Royal Astronomical Society　326　(2)　637-642　2001/09/11

DOI： 10.1046/j.1365-8711.2001.04624.x 　

ISSN： 0035-8711
Reconstructing the history of star formation in rich cluster cores

Tadayuki Kodama, Richard G. Bower

Monthly Notices of the Royal Astronomical Society　321　(1)　18-36　2001/02/11
Publisher: Blackwell Publishing Ltd
DOI： 10.1046/j.1365-8711.2001.03981.x 　

ISSN： 0035-8711
Galaxy population in a cluster of galaxies around the radio galaxy 3C 324 at z = 1.2 1 Peer-reviewed

Fumiaki Nakata, Masaru Kajisawa, Toru Yamada, Tadayuki Kodama, Kazuhiro Shimasaku, Ichi Tanaka, Mamoru Doi, Hisanori Furusawa, Masaru Hamabe, Masanori Iye, Masahiko Kimura, Yutaka Komiyama, Satoshi Miyazaki, Sadanori Okamura, Masami Ouchi, Toshiyuki Sasaki, Maki Sekiguchi, Masafumi Yagi, Naoki Yasuda

Publications of the Astronomical Society of Japan　53　(6)　1139-1152　2001
Publisher: Astronomical Society of Japan
DOI： 10.1093/pasj/53.6.1139 　

ISSN： 0004-6264
Subaru Deep Near-Infrared Imaging of the Field of a Possible Proto-Cluster Near the Radio Galaxy 53W002 at z=2.4 Peer-reviewed

Yamada, T, Motohara, K, Iwamuro, F, Maihara, T, Kajisawa, M, Tanaka, I, Kodama, T, Terada, H, Goto, M, Tanabe, H, Taguchi, T, Hata, R, Takata, T, Sekiguchi, K, Iye, M, Sasaki, T, Usuda, T, Kosugi, G, Simpson, C

Publications of the Astronomical Society of Japan　53　(6)　1119-1131　2001
Publisher:
DOI： 10.1093/pasj/53.6.1119 　

ISSN： 0004-6264
A rich cluster of galaxies near the quasar B2 1335+28 at z=1.1: Color distribution and star formation properties

Tanaka, I, T Yamada, A Aragon-Salamanca, T Kodama, T Miyaji, K Ohta, N Arimoto

ASTROPHYSICAL JOURNAL　528　(1)　123-138　2000/01

DOI： 10.1086/308156 　

ISSN： 0004-637X
Origin of color gradients in elliptical galaxies Peer-reviewed

Naoyuki Tamura, Chiaki Kobayashi, Nobuo Arimoto, Tadayuki Kodama, Kouji Ohta

Astronomical Journal　119　(5)　2134-2145　2000
Publisher: University of Chicago Press
DOI： 10.1086/301333 　

ISSN： 0004-6256
Clustering of red galaxies near a radio-loud quasar at z=1.086

Tanaka, I, T Yamada, A Aragon-Salamanca, T Kodama, K Ohta, N Arimoto

GALAXY INTERACTIONS AT LOW AND HIGH REDSHIFT　(186)　487-487　1999

ISSN： 0074-1809
Secondary episodes of star formation in elliptical galaxies Peer-reviewed

Tadayuki Kodama, Nobuo Arimoto

Monthly Notices of the Royal Astronomical Society　300　(1)　193-199　1998/10/11
Publisher: Blackwell Publishing Ltd
DOI： 10.1046/j.1365-8711.1998.01890.x 　

ISSN： 0035-8711
Red galaxies near a quasar at z=1.1: Age difference among the cluster galaxies

T Yamada, Tanaka, I, A Aragon-Salamanca, T Kodama, K Ohta, N Arimoto

YOUNG UNIVERSE: GALAXY FORMATION AND EVOLUTION AT INTERMEDIATE AND HIGH REDSHIFT　146　526-529　1998
Clustering of red galaxies near the radio-loud quasar 1335.8+2834 at z = 1.1

T Yamada, Tanaka, I, A AragonSalamanca, T Kodama, K Ohta, N Arimoto

ASTROPHYSICAL JOURNAL　487　(2)　L125-&　1997/10

DOI： 10.1086/310889 　

ISSN： 0004-637X
Origin of the colour-magnitude relation of elliptical galaxies

Tadayuki Kodama, Nobuo Arimoto

Astronomy and Astrophysics　320　(1)　41-53　1997/04/01

ISSN： 0004-6361

Show all ︎Show first 5

Misc. 29

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arXiv e-Print　2023/04

DOI： 10.48550/arXiv.2304.08104 　

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LIU Zhaoran, KODAMA Tadayuki, MARTINEZ Jose Manuel Perez, YAMAMOTO Naoaki, MAO Zhiying, LAISHRAM Ronaldo, DAIKUHARA Kazuki, ADACHI Kouta, OKAZAKI Riho, TAMURA Masaharu, ASANO Tetsuro, MOTOHARA Kentaro, KONISHI Masahiro, TAKAHASHI Hidenori, KOYAMA Yusei, TANAKA Ichi, SUZUKI Tomoko, LUBIN Lori, LEMAUX Brian

日本天文学会年会講演予稿集　2022　2022

ISSN： 1347-0639
Studies of Galaxy Clusters using the Subaru HSC-SSP survey

岡部信広, 大栗真宗, 宮崎聡, 児玉忠恭, 小山佑世

天文月報　112　(3)　2019

ISSN： 0374-2466
グリーンバレー銀河,およびMS銀河における星形成効率の形態依存性

小山舜平, 小山佑世, 山下拓時, 林将央, 松原英雄, 中川貴雄, 並木茂朗, 鈴木智子, 鈴木智子, 深川奈桜, 児玉忠恭, LIN Lihwai, 諸隈佳菜, 嶋川里澄, 田中壱

日本天文学会年会講演予稿集　2019　2019

ISSN： 1347-0639
The Nature and Environment of Dusty Star-Forming Galaxies Near and Far Revealed by AKARI

Koyama Yusei, Matsuki Yasuhiro, Koyama Shuhei, Nakagawa Takao, Matsuhara Hideo, Takita Satoshi, Yamashita Takuji, MorokumaMatsui Kana, Kodama Tadayuki, Shimakawa Rhythm, Namiki Shigeru, Hayashi Masao, Tadaki Kenichi

(17)　205-208　2018/03/09
Publisher: Japan Aerospace Exploration Agency (JAXA)
ISSN： 2433-2232

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The 4th AKARI International Conference: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life (October 17-20, 2017. The University of Tokyo), Bunkyo-ku, Tokyo, JapanWe present our continuous efforts over the last decade - since the launch of AKARI - to unveil the environmental impacts on dust properties of galaxies in the local and distant universe by making full use of the AKARI 'all-sky' and 'pointed' observations. We first introduce our new result on the environmental effects on the dust temperature (T(sub dust)) of local star-forming galaxies. By performing stacking analysis of the AKARI FIS all-sky map (at the positions of SDSS star-forming galaxies in different environments), we find that T(sub dust) of galaxies increases with increasing environmental density, supporting a cold dust stripping scenario in high-density environments. We also present the results from our systematic, wide-field MIR 'pointed' observations of distant clusters with AKARI/IRC, in combination with our Subaru H alpha observing campaign. Taking advantage of the wide-field coverage of AKARI (and Subaru), we revealed that dust-obscured galaxies are most frequently triggered at the periphery of distant clusters. The coincidence of the environment of dusty galaxies and that of galaxy color transition suggests a strong link between dusty galaxies and the process of environmental quenching during the course of cluster-scale assembly.Physical characteristics: Original contains color illustrations
赤方偏移1.46の遠方銀河団銀河の分子ガス量と星形成効率

林将央, 但木謙一, 児玉忠恭, 河野孝太郎, 山口裕貴, 廿日出文洋, 小山佑世, 嶋川里澄, 田村陽一, 鈴木智子

日本天文学会年会講演予稿集　2018　2018

ISSN： 1347-0639
z=2.5の銀河で発見された高速回転するスターバーストコア

但木謙一, 児玉忠恭, NELSON E. J., BELLI S., FOERSTER SCHREIBER N. M., GENZEL R., HERRERA-CAMUS R., LUTZ D., TACCONI L. J., UEBLER H., WISNIOSKI E., LIPPA M., 林将央, 小山佑世, 嶋川理澄, 中西康一郎, 鈴木智子, 田中壱, LANG P., WUYTS S., 五十嵐創, 廿日出文洋, 河野孝太郎, 田村陽一

日本天文学会年会講演予稿集　2017　2017

ISSN： 1347-0639
AzTEC1.1mmによるLyα Blob周辺領域の原始銀河団探査

斎藤智樹, 松田有一, 川邊良平, 児玉忠恭, 田中壱, 河野孝太郎, 廿日出文洋, 李民主, SMAIL Ian, LACEY Cedric, 井上昭雄, 田村陽一, DE BREUCK Carlos, 山田亨, 林野友紀, 太田耕司, ORSI Alvaro, 谷口義明

日本天文学会年会講演予稿集　2017　2017

ISSN： 1347-0639
近傍銀河における星形成活動と分子ガス存在量の関係の環境依存性調査

小山舜平, 小山舜平, 小山佑世, 山下拓時, 諸隈佳菜, 松原英雄, 中川貴雄, 児玉忠恭, 林将央, 鈴木智子, 但木謙一, 田中壱, 嶋川里澄, 嶋川里澄, 山元萌黄

日本天文学会年会講演予稿集　2017　2017

ISSN： 1347-0639
誰も気づかなかった銀河と銀河団高温プラズマの相互作用

牧島一夫, 牧島一夫, GU Liyi, 稲田直久, 兒玉忠恭, 中澤知洋, 川原田円

日本天文学会年会講演予稿集　2016　282　2016/02/20

ISSN： 1347-0639
近傍の星形成銀河における分子ガスの性質と銀河環境の関係

小山舜平, 小山舜平, 小山佑世, 山下拓時, 松原英雄, 中川貴雄, 児玉忠恭, 諸隈佳菜, 嶋川里澄, 林将央

日本天文学会年会講演予稿集　2016　2016

ISSN： 1347-0639
多波長データ解析によるz~3-4 Lyα Blob周辺環境の解明

斎藤智樹, 松田有一, 川邊良平, 児玉忠恭, 田中壱, 廿日出文洋, SMAIL Ian, LACEY Cedric, 井上昭雄, ORSI Alvaro, 河野孝太郎, 田村陽一, 李民主, 山田亨, 林野友紀, 太田耕司, DE BREUCK Carlos, 谷口義明

日本天文学会年会講演予稿集　2015　2015

ISSN： 1347-0639
ULTIMATE-SUBARU:概念設計報告

早野裕, 岩田生, 大屋真, 美濃和陽典, 児玉忠恭, LAI Olivier, 高見英樹, 寺田宏, 臼田知史, 西村徹郎, 家正則, 服部雅之, 服部尭, 友野大悟, 田中壱, 瀧浦晃基, 高遠徳尚, 大橋永芳, 有本信雄, 秋山正幸, 大野良人, 本原顕太郎, 渡辺誠, 山室智康

日本天文学会年会講演予稿集　2013　2013

ISSN： 1347-0639
z~2.5原始銀河団における,AzTEC/ASTEソースとDRGの位置対応

田中壱, 鈴木健太, 河野孝太郎, 田村陽一, 児玉忠恭, 中西康一郎

日本天文学会年会講演予稿集　2012　2012

ISSN： 1347-0639
すばる次世代広視野補償光学および赤外線新装置:初期検討報告

早野裕, 岩田生, 大屋真, 美濃和陽典, 児玉忠恭, 高見英樹, 寺田宏, 臼田知史, 西村徹郎, 家正則, 服部雅之, 服部尭, 友野大悟, 田中壱, 瀧浦晃基, 高遠徳尚, 大橋永芳, 有本信雄, 秋山正幸, 大野良人, 本原顕太郎, 田村直之, 渡辺誠, 山室智康

日本天文学会年会講演予稿集　2012　2012

ISSN： 1347-0639
Submm/IR Observations for Dusty Star-forming Galaxies in the Protocluster at z=2.48

鈴木賢太, 河野孝太郎, 田村陽一, 井上裕文, 五十嵐創, 梅畑豪紀, 中西康一郎, 児玉忠恭, 田中壱, 廿日出文洋, 鍛冶澤賢, IVISON Rob, WILSON Grant, YUN Min, HUGHES David, ARETXAGA Itziar, ZEBALLOS Milagros

日本天文学会年会講演予稿集　2011　2011

ISSN： 1347-0639
AzTEC/ASTEによる電波銀河4C 23.56周囲の星形成銀河サーベイ

鈴木賢太, 河野孝太郎, 井上裕文, 五十嵐創, 梅畑豪紀, 中西康一郎, 田村陽一, 廿日出文洋, 児玉忠恭, 田中壱, 鍛冶澤賢, IVISON Rob, WILSON Grant, YUN Min, HUGHES David, ARETXAGA Itziar, ZEBALLOS Milagros

日本天文学会年会講演予稿集　2010　2010

ISSN： 1347-0639
高赤方偏移電波銀河周辺におけるサブミリ銀河の密度超過の多様性

田代素子, 河野孝太郎, 田村陽一, 廿日出文洋, 中西康一郎, 川辺良平, 江澤元, 児玉忠恭, 田中壱, 鍛冶沢賢, WILSON Grant, YUN Min S., HUGHES David, CORTES Juan

日本天文学会年会講演予稿集　2009　2009

ISSN： 1347-0639
AzTEC/ASTEによる高赤方偏移電波銀河周辺でのサブミリ波銀河探査:密度超過の多様性

田代素子, 河野孝太郎, 田村陽一, 廿日出文洋, 中西康一郎, 川辺良平, 江澤元, 児玉忠恭, 田中壱, 鍛冶沢賢, WILSON Grant, YUN Min S., HUGHES David, CORTES Juan

日本天文学会年会講演予稿集　2009　2009

ISSN： 1347-0639
赤外線天文衛星「あかり」による北黄極大規模サーベイの進捗状況

大薮進喜, 松原英雄, 和田武彦, 大山陽一, 金宇征, PEARSON Chris P., 高木俊暢, 中川貴雄, 度會英教, 児玉忠恭, 有本信雄, 藤代尚文, 花見仁史, LEE H.M., IM M., LEE M.G., WHITE G., SERJEANT S.

日本天文学会年会講演予稿集　2006　2006

ISSN： 1347-0639
Discovery of a large-scale clumpy structure around the Lynx supercluster at z similar to 1.27

F Nakata, T Kodama, K Shimasaku, M Doi, H Furusawa, M Hamabe, M Kimura, Y Komiyama, S Miyazaki, S Okamura, M Ouchi, M Sekiguchi, Y Ueda, M Yagi, N Yasuda

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　357　(4)　1357-1362　2005/03

DOI： 10.1111/j.1365-2966.2005.08756.x 　

ISSN： 0035-8711

eISSN： 1365-2966
A panoramic Hα imaging survey of the z = 0.4 cluster Cl0024.0+1652 with Subaru

Tadayuki Kodama, Michael L. Balogh, Ian Smail, Richard G. Bower, Fumiaki Nakata

Monthly Notices of the Royal Astronomical Society　354　(4)　1103-1119　2004/11/11

DOI： 10.1111/j.1365-2966.2004.08271.x 　

ISSN： 0035-8711
Down-sizing in galaxy formation at z similar to 1 in the Subaru/XMM-Newton Deep Survey (SXDS)

T Kodama, T Yamada, M Akiyama, K Aoki, M Doi, H Furusawa, T Fuse, M Imanishi, C Ishida, M Iye, M Kajisawa, H Karoji, N Kobayashi, Y Komiyama, G Kosugi, Y Maeda, S Miyazaki, Y Mizumoto, T Morokuma, F Nakata, J Noumaru, R Ogasawara, M Ouchi, T Sasaki, K Sekiguchi, K Shimasaku, C Simpson, T Takata, Tanaka, I, Y Ueda, N Yasuda, M Yoshida

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　350　(3)　1005-1014　2004/05

DOI： 10.1111/j.1365-2966.2004.07711.x 　

ISSN： 0035-8711
A rich cluster of galaxies near the quasar B2 1335+28 at z 1.1: Color distribution and star formation properties (vol 528, pg 123, 2000)

Tanaka, I, T Yamada, A Aragon-Salamanca, T Kodama, T Miyaji, K Ohta, N Arimoto

ASTROPHYSICAL JOURNAL　546　(1)　604-604　2001/01

DOI： 10.1086/318267 　

ISSN： 0004-637X
POLAR RING SPIRAL GALAXY NGC-660

W VANDRIEL, F COMBES, F CASOLI, M GERIN, N NAKAI, T MIYAJI, M HAMABE, Y SOFUE, T ICHIKAWA, S YOSHIDA, Y KOBAYASHI, F GENG, T MINEZAKI, N ARIMOTO, T KODAMA, P GOUDFROOIJ, PS MULDER, K WAKAMATSU, K YANAGISAWA

ASTRONOMICAL JOURNAL　109　(3)　942-959　1995/03

ISSN： 0004-6256

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Presentations 37

Panoramic views of gas accretion, star formation, and mass assembly histories in protoclusters

Tadayuki Kodama

A journey through galactic environments　2023/09/25
Panoramic views of cluster formation and evolution across cosmic time

Tadayuki Kodama

First structure 2023　2023/09/05
HSC-MBF + ULTIMATE-MBF for cluster/LSS studies Invited

Tadayuki Kodama

HSC MBF Workshop　2023/09/01
Panoramic and sharp views of galaxy and cluster formation and evolution with ULTIMATE-Subaru

Tadayuki Kodama

APRIM2023　2023/08/11
Outstanding issues on galaxy cluster formation and evolution Invited

Tadayuki Kodama

ILR kickoff meeting　2023/05/31
HySPEC-Euclid: Hybrid Search for Proto Evolving Clusters with Euclid

Tadayuki Kodama

JEC kick-off meeting　2023/04/28
Rise and Fall of Star Formation in Clusters/Proto-clusters Invited

Tadayuki Kodama

ESA-ESO workshop: Euclid Galaxy Evolution　2022/10/26
Accelerated galaxy formation and quenching in distant clusters Invited

Tadayuki Kodama

Alvio@80　2022/09/09
Remaining Key Questions on Galaxy Cluster Formation and Evolution Invited

Tadayuki Kodama

In situ view of galaxy formation 2　2022/07/29
Superb Wide-field Imaging Multi-colour Survey with 18 Filters Invited

Tadayuki Kodama, SWIMS, eam

Massive galaxies and clusters in the early Universe　2021/11/15
Panoramic views of cluster formation and evolution across cosmic time Invited

Tadayuki Kodama

Colloquium, Univ. of Vienna　2021/10/25
Superb Wide-field Imaging Multi-colour Survey with 18 Filters Invited

Tadayuki Kodama, SWIMS-18 team

Super-IRnet Seminar　2021/10/08
First stars, First galaxies 2020 Invited

Kodama, Tadayuki

2020/11/18
DISCUSSION 3: Evolutionary Scenarios Invited

Kodama, Tadayuki

Protoclusters: galaxies in confinement　2020/09/03
Quenching history of galaxies at z<2 probed by PFS2 Invited

Kodama, Tadayuki

GOGREEN/GCLASS Data Release and Workshop　2020/08/27
HSC2+PFS2, SWIMS and ULTIMATE surveys of galaxy clusters at 0.5<z<5 Invited

Kodama, Tadauyki

GOGREEN/GCLASS Data Release and Workshop　2020/08/26
Past 20 years of panoramic studies of distant clusters with Subaru and the Future International-presentation Invited

Kodama, Tadayuki

Optical & Infrared Astronomy for the Next Decade　2019/11/20
Revealing the build-up of large scale structures and galaxy populations therein with PFS2 International-presentation Invited

Kodama, Tadayuki

Optical & Infrared Astronomy for the Next Decade　2019/11/19
Gas and star formation in proto-clusters at z>1.5 and the future prospects International-presentation Invited

KODAMA Tadayuki

First Galaxies, First Structures　2019/10/24
HSC distant cluster search (HSC^2) and future prospects with PFS^2 Invited

KODAMA Tadayuki

The 3rd HSC-X cluster workshop　2019/09/18
Transition of gas accretion mode in proto-clusters at the cosmic noon Invited

Kodama, Tadayuki

Colloquium (Padova Observatory)　2019/07/15
Transition of gas accretion mode to clusters at z~2 International-presentation

KODAMA Tadayuki

Tracing Cosmic Evolution with Clusters of Galaxies　2019/07/11
SWIMS-18, PFS^2, and ULTIMATE-K Invited

KODAMA Tadayuki

NIR wide-field workshop　2019/07/02
SWIMS-18, PFS2, and ULTIMATE-K Invited

Kodama, Tadayuki

2019/07/02
Big and sharp eyes on galaxy cluster formation and evolution across cosmic times International-presentation Invited

KODAMA Tadayuki

Extremely Big Eyes on the Early Universe　2019/03/26
Galaxy quenching explored with HSC^2, PFS^2, and ULTIMATE-K International-presentation Invited

KODAMA Tadayuki

Panchromatic and Panoramic Studies of Galaxy Clusters　2019/03/11
Transition of gas accretion mode in proto-clusters at the cosmic noon International-presentation

KODAMA Tadayuki

Australia-ESO confenrence 2019　2019/02/20
Synergetic studies of distant clusters between Canada and Subaru International-presentation Invited

KODAMA Tadayuki

Canada-Subaru workshop　2018/10/12
Galaxy cluster formation revealed by Mahalo-Subaru and Gracias-ALMA International-presentation Invited

KODAMA Tadayuki

Chile-Japan Academic Forum 2018　2018/09/27
Gracias-ALMA: Molecular gas in massive galaxies and its environmental dependence at the cosmic noon International-presentation

KODAMA Tadayuki

Birth, life and fate of massive galaxies and their central beating heat　2018/09/05
Cluster Science with ELTs International-presentation Invited

KODAMA Tadayuki

EArly Science with ELTs (EASE)　2018/08/31
High-z imaging science with ULTIMATE-Subaru Invited

KODAMA Tadayuki

ULTIMATE-Subaru Collaboration Meeting　2018/01/16
Mass aseembly, star formation, and morphology/size evolution at 1<z<4 and beyond International-presentation Invited

KODAMA Tadayuki

WFIRST-Subaru Synergistic Observation Workshop　2017/12/19
A gas-rich proto-cluster in making at z~2.5 International-presentation Invited

KODAMA Tadayuki

Sharp Views of Galaxy Formation and Evolution (Germany-Japan (DAAD-JSPS) workshop)　2017/11/02
Hybrid Search for Clusters with HSC (HSC^2) Invited

KODAMA Tadayuki

HSC-X Cluster Workshop　2017/08/04
私の海外での研究滞在と国際共同研究の経験から思うこと

KODAMA Tadayuki

光赤天連シンポ2017　2017/07/25
Enhanced Lyα depletion in the proto-cluster cores at z=2.5 International-presentation

KODAMA Tadayuki

Early Stages of Galaxy Cluster Formation (GCF2017)　2017/07/21

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Research Projects 19

Comprehensive understanding of the formation history of structures in the Universe

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Fund for the Promotion of Joint International Research (International Leading Research )

Institution: National Astronomical Observatory of Japan

2022/12/20 - 2029/03/31
すばるとTAOのペア狭帯域撮像で捉える銀河形成最盛期のガス集積と星形成の連携

久保真理子, 児玉忠恭, 本原顕太郎, 小西真広, 高橋英則, 長峯健太郎, 嶋川里澄

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(B)

Institution: 東北大学

2025/04 - 2029/03
JWSTと究極の多波長・高解像観測による銀河団銀河の形態発現プロセスの解明

小山佑世, 嶋川里澄, 但木謙一, 児玉忠恭

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(B)

Institution: 国立天文台

2023/04/01 - 2026/03/31
高精度原始銀河団シミュレーションによる銀河形成と宇宙再電離研究の新展開

矢島秀伸, 松田有一, 井上昭雄, 児玉忠恭

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(A)

Institution: 筑波大学

2021/04/05 - 2026/03/31
Study of Galaxy Formation Activities at Cosmic Noon by Near-Infrared Integral Field Spectroscopy

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

Category: Grant-in-Aid for Scientific Research (A)

Institution: National Astronomical Observatory of Japan

2020/04/01 - 2025/03/31
Revealing the physical processes that accelerate and decelerate galaxy formation

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2018/04/01 - 2023/03/31
銀河団形成領域の高分解能計算と広視野・高分解能観測で解き明かす銀河と銀河団の進化

岡本崇, 諸隈佳菜, 児玉忠恭

Offer Organization: 日本学術振興会

System: 科学研究費助成事業基盤研究(B)

Category: 基盤研究(B)

Institution: 北海道大学

2019/04/01 - 2022/03/31

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銀河形成のシミュレーションの流体を扱うのにもちいている mesh-free 法を用いた場合の、ガス雲の自己重力による分裂が、数値分解能にどう依存するのかを詳しく調べた。その結果、メッシュ法を用いた場合に、局所的なジーンズ長が分解出来ていない場合に、重力的に安定であるはずの揺らぎが数値的に成長してしまう、いわゆる artifical fragmentation は、mesh-free 法では生じないことが分かった。つまり、mesh-free 法を用いた場合には、たとえジーンズ長が分解できていなくても、物理的に安定な摂動は安定なまま成長することはない。一方、mesh-free 法のもとで、不安定な揺らぎは、数値分解能に依らず成長するが、ジーンズ長が分解できていない場合には、その成長が著しく遅れることも明らかになった。 また数値シミュレーションを用いて、孤立銀河において円盤の自己重力不安定性によって形成された棒構造と他の銀河との潮汐相互作用によって形成された棒構造が星形成にどのような影響を与えるか、を調べた。その結果、棒構造の誘起メカニズムの違いにより、棒構造内の星形成活動に違いが見られることが明らかになった。この結果を利用することで、銀河の棒構造形成メカニズムについて、観測的に区別をつけられる可能性がある。 銀河団内の銀河の星形成を抑制するメカニズムを ALMA 望遠鏡を用いた観測により調べるプロジェクトに参加した。その結果、銀河団内の銀河の星形成は、銀河同士の相互作用よりも、銀河団ガスとの相互作用により、抑制されている可能性が高いという結果を得た。
Development of Near-Infrared Tunable Filter for Research of Star-formation Activity by 3D Spectroscopy

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: The University of Tokyo

2018/04/01 - 2022/03/31
Development of a Wide-Wavelength-Coverage Integral Field Spectrograph Unit to Probe Galaxy Evolution

Motohara Kentaro

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

Category: Grant-in-Aid for Scientific Research (A)

Institution: The University of Tokyo

2015/04/01 - 2020/03/31

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After the completion of assembly, integration and testing of SWIMS optics and cryogenics in Japan, we have transported it to Subaru telescope at Hawaii and carried out commissioning runs in FY2018. We have successfully confirmed that in both the imaging and the multi-object spectroscopy mode, SWIMS shows the performance as expected. We have also carried out a pilot imaging observations by medium-band filters targeting at high-redshift starburst galaxies, as well as multi-object spectroscopy of luminous infrared galaxies. We have also carried out a development study of the integral-field unit (IFU) of SWIMS. Applying a ultra-high precision machining technique to special aluminum alloy RSA6061, we have proved that all the mirror-arrays necessary for the IFU can be fabricated. We have also fabricated the slit-mirror array for the IFU.
The peak epoch of galaxy formation as revealed by Subaru NIR imaging with 18 filters

Kodama Tadayuki, MOTOHARA Kentaro, KONISHI Masahiro, KOYAMA Yusei, TADAKI Ken-ichi, TOSHIKAWA Jun, SHIMAKAWA Rizumu, SUZUKI Tomoko, YAMAMOTO Moegi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

Category: Grant-in-Aid for Scientific Research (A)

Institution: National Astronomical Observatory of Japan

2012/04/01 - 2017/03/31

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The galaxy formation is peaked at around 10 Billion years ago in the Universe, and thus it is the critical epoch for studies of galaxy formation and evolution. We make a series of narrow-band and medium-band filters on a new NIR camera SWIMS in order to conduct a large super multi-band imaging survey by capturing nebular emission lines from star forming galaxies and spectral break feature from older galaxies. This enables us to explore the histories of star formation and mass assembly and their environmental dependence. We have optimized the survey design based on the sensitivities of each filter. In preparation for the above mentioned large survey, we have conducted various observational projects with Subaru and ALMA telescopes targeting the galaxies in this critical peak epoch of their formation. These results are published in 26 papers in major refereed journals.
The Origin of Morphologies of Galaxies : Explorations with Multi-Object and Integral-Field Spectroscopic Observations

ARIMOTO Nobuo, NISHIMURA Tetsuo, IWATA Ikuru, TANAKA Makoto, KODAMA Tadayuki, USUDA Tomonori, OYA Shin, ISHIGAKI Tsuyoshi, ANNA Ferré-Mateu, ONODERA Masato

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (S)

Category: Grant-in-Aid for Scientific Research (S)

Institution: National Astronomical Observatory of Japan

2011/04/01 - 2015/03/31

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The cosmic star-formation activity is known to have its peak around 2-3 billion years after the Big Bang. Orderly morphologies such as spirals and ellipticals then emerge. What is the primary driver of such evolution? In order to answer this fundamental question, we initiated the upgrade of MOIRCS, near-infrared instrument for Subaru Telescope. We also conducted intensive observations of distant and nearby galaxies. We obtained some critically important insights of galaxy evolution. We found the star-forming galaxies at z~2.5 with abundant molecular gas generated their stellar content rapidly, and terminated their activity around z~1.5. Then such galaxies evolved passively and became giant elliptical galaxies in the present universe.
A Study of the Evolution of Large Scale Structures Based on the Ultra Wide Band Mm/Submm Observations

KOHNO Kotaro, KAWABE Ryohei, MATSUHARA Hideo, MINAMIDANI Tetsuhiro, HABE Asao, HANDA Toshihiro, KAWARA Kimiaki, TAMURA Yoichi, EZAWA Hajime, OSHIMA Tai, KODAMA Tadayuki, IONO Daisuke

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Specially Promoted Research

Category: Grant-in-Aid for Specially Promoted Research

Institution: The University of Tokyo

2008 - 2012

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We uncovered more than 1400 dust-obscured massive starburst galaxies (submm-galaxies) using a continuum camera mounted on the submm-wave telescope ASTE. In order to study their redshifts and properties, we developed a multi-band super-conducting camera and an ultra wide-band spectroscopy system. We discovered a cluster of submm-galaxies associated with the large-scale structure in the early universe (at a redshift of 3.1). We also found ultra-bright submm-galaxies amplified by a gravitational lens and very high-z sub-mm galaxy candidates. Including these, we obtained important clues on the formation and evolution of massive galaxies.
Panoramic Views of Star Formation History in Clusters with Subaru Telescope

KODAMA Tadayuki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: National Astronomical Observatory of Japan

2009 - 2011

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Using the narrow-band filters that are manufactured with this grant, we have conducted the Mahalo-Suabru project which has been tracing large scale structures in and around distant clusters as traced by star forming galaxies. Moreover, star forming activities across different environments have been investigated in detail and it is revealed that galaxy formation takes place and propagates from cluster centers to outer regions with cosmic time.
Study of Interactions between Galaxies and Intra-Cluster Plasmas

MAKISHIMA Kazuo, NAKAZAWA Kazuhiro, HIRAGA Junko, INADA Naohisa, KOKUBUN Motohide, KAWAHARADA Madoka, KODAMA Tadayuki, MATSUSHITA Kyoko

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (S)

Category: Grant-in-Aid for Scientific Research (S)

Institution: The University of Tokyo

2006 - 2010

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The present research aimed at demonstrating our conjecture, that galaxies in a galaxy cluster must be interacting strongly with the hot plasma filling the cluster volume, and hence are falling to the center. Through X-ray observations using Suzaku and other means, we successfully revealed the presence of a large-scale ordered magnetic structure in the center of some clusters, and obtained evidence of plasma heating process therein. Incorporating optical data, we also obtained evidence that galaxies have actually been falling to the center of the cluster over the cosmological time scale.
Formation of galaxies in the distant Universe probed by near-infrared narrow-band imaging with Subaru Telescope

KODAMA Tadayuki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (A)

Category: Grant-in-Aid for Young Scientists (A)

Institution: National Astronomical Observatory of Japan

2006 - 2008
Unveiling the Galaxy Evolution by Multi-wavelength Study of Hyper Extremely Red Odjects

MATSUHARA Hideo, NAKAGAWA Takao, WADA Takehiro, ARIMOTO Nobuo, KODAMA Tadayasu, KAWARA Kimiaki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

Category: Grant-in-Aid for Scientific Research (A)

Institution: Japan Aerospace Exploration Agency

2004 - 2007

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The purpose of this research is to discover "hyper extremely red galaxies(HERGs)" and reveal their natures through multi-wavelength deep extragalactic surveys with space and ground based observatories. The HERGs are thought to be distant galaxies with spectra suffered from large redshift. Therefore they are important objects to understand the star formation history of the universe. As a first step of this research, we performed optical(SUBARU, CFHT), near-infrared(KPNPO), mid & far-infrared(space), and radio(WSRT) deep survey observations toward the north ecliptic pole(NEP), over both 0.38 square degrees("deep" field) and 5.8 square degrees("wide" filed). The space observations at 2.4-160 microns were made with an infrared space telescope AKARI, launched in February 2006. The second step is to extract the candidates of the HERGs from the above multi-wavelengths spectia. We performed the image analysis and the source extraction, and generated and-merged catalogues. Thanks to the continuous wavelength coverage of AKARI in near and mid-infrared, we could obtain AKARI-unique galaxy populations, such as the "PAH(polycyclic aromatic hydrocarbons) luminous galaxies" as well the extremely red mid-infrared objects(ERMOs). The number of PAH luminous galaxies are only one percent of the total mid-infrared selected galaxies, however, are interpreted as very young star-forming galaxies, and thus precious to understand the galaxy evolution. The ERMOs, on the other hand, occupies approximately 10 percent of the total mid-inftared selected galaxies. We found significant portion of ERMOs may harbour the dust obscured AGN(active galactic nuclei). We will further investigate these new populations in order to reveal their natures and give new pictures on the galaxy evolution.
広視野観測によって明かす宇宙の階層的構造形成史と星形成史

児玉忠恭

Offer Organization: 日本学術振興会

System: 科学研究費助成事業若手研究(B)

Category: 若手研究(B)

Institution: 国立天文台

2003 - 2005

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本研究は、我が国のすばる望遠鏡のユニークな特長である広視野カメラを主に利用して、遠方宇宙の観測を系統的に行い、宇宙の構造とそれを構成する銀河の特性を、時間と環境との関数として詳細に比較することによって、宇宙が誕生してから今日の階層的銀河宇宙が形成されてくるまでの過程(特に構造形成と銀河進化)を実証的に明らかにすることを目標とした(PISCESプロジェクト)。本年は当課題の最終年度であった。10月に3晩、チリのNTT望遠鏡にて、すばるで見つかり既に分光確認されているz=0.83にある銀河団周辺の大規模構造に沿って、近赤外線の広視野撮像観測を行った。目的は銀河を構成する星質量関数を求めることで、データは現在解析中であるが、星質量が十分成長を遂げている兆候をつかんでいる。このように本研究で推進してきたPISCESプロジェクトは、これまでに8つの銀河団について撮像観測を終え、銀河団が大規模構造に沿って銀河を膠着させながら成長してゆく様と、その中で銀河の特性、特に星形成率が環境によって影響を受けながら成長して行く様を描き出すことに成功した。さらに、重力レンズ効果を利用し、銀河団の背景にz=3.9の遠方銀河も発見した。これらの結果は、今年度、計4本の査読論文に発表した。一方、PISCESプロジェクトをより遠方の宇宙に発展させるため、すばるの近赤外線撮像観測(CISCOとMOIRCS)によって、超遠方(z〜2以上)のクエーサーの周辺領域の探査を引き続いて行っている。9月の観測では有力な原始銀河団候補を新たに2つ発見すると共に、これらのデータをスピッツァー望遠鏡の結果と比較し、銀河質量の進化の解析をz=2.5で展開中である。また、1月にはCISCOに比べて視野7倍も広いMOIRCSを用いて、さらに遠方(z〜3)の原始銀河団候補領域(これまでの輝線銀河サーベイで同定されていたもの)の近赤外線マッピングを行ない、電波銀河の周りに輝線銀河の分布に沿うようにして赤い進化した銀河も密度超過していることが明らかになった。この結果は銀河団の形成時期が非常に早いことを示唆し、銀河形成上重要である。
Formation and Evolution of the Milky Way

CHIBA Masashi, TOSA Makoto, AOKI Wako, KODAMA Tadayuki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

Category: Grant-in-Aid for Scientific Research (C)

Institution: Tohoku University

2003 - 2004

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Structural, kinematical, and chemical properties of old, metal-poor stellar haloes of galaxies have long provided valuable information on early formation histories of galaxies, in particular; galaxies in the Local Group. For example, the observed correlation between chemical and dynamical properties of Galactic halo stars or lack thereof have enabled authors to discuss whether the Galaxy was formed by a monolithic collapse within a few dynamical timescales. Numerical simulations of Galaxy formation based on the cold dark matter model have demonstrated that basic physical processes involved in the formation of the metal-poor, old stellar halo in a disk galaxy are described by both dissipative and dissipationless merging of subgalactic clumps and their resultant tidal disruption in the course of gravitational contraction of the galaxy at high redshift : Thus, understanding of star formation and chemical evolution histories in subgalactic clumps (i.e., progenitors of low-mass dwarfs) are key for better understanding of the origin of galactic stellar halos. Also, although many observational and theoretical studies in the young universe have already provided important constraints on the cosmic reionization history, it remains yet to be explored in the present-day universe as to (1)whether old stellar halos of galaxies contain the fossil records of reionization history and (2)what observations of stellar halos can provide what clues to the possible influences of reionization on galaxy formation processes. Physical properties of metal-poor, old stellar halos in galaxies beyond the Local Group have been recently investigated by the Hubble Space Telescope and large ground--based telescopes. Furthermore, recent numerical studies provided some specific predictions on star formation histories of dwarf galaxies under the influence of reionization. Thus it is quite timely to discuss the above questions based on the comparison between observations and numerical simulations addressing the possible influence of reionization on the properties of galactic stellar halos. Taking advantage of this grant awarded, we have made a lot of progresses about the above issue as well as other relevant issues on the formation and evolution of the Milky Way and Local Group galaxies. Furthermore, we have studied the structure of dark matter surrounding the visible parts of galaxies, which is supposed to play an important role in the formation process of galaxies through hierarchical clustering. For this purpose, we have focused on gravitational lensing phenomena on background sources (such as QSOs), to set limits on mass substructure in lensing galaxies. Both observational and theoretical analyses have been made on this issue.
すばる望遠鏡を用いた遠方銀河団観測から明かす銀河団銀河の形成期と初期進化

児玉忠恭

Offer Organization: 日本学術振興会

System: 科学研究費助成事業特別研究員奨励費

Category: 特別研究員奨励費

Institution: 東京大学

1999 - 2001

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Teaching Experience 7

天文学セミナー　東北大学理学部
銀河宇宙物理学I　東北大学理学部
Advanced Course on Physics of Galaxies II & Special Lecture on Physics of Galaxies　Astronomical Institute, Tohoku University
Frontiers in Science　Tohoku University, Graduate School of Science
Structure of the Natural World　Tohoku University
Stellar populations in distant galaxies and galaxy clusters　University of Vienna, Austria
Formation and evolution of galaxies and clusters　Nagoya University Postgraduate

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