東北大学研究者紹介

研究者詳細

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コダマ　タダユキ

兒玉　忠恭

Tadayuki Kodama

所属

大学院理学研究科　天文学専攻　天文学講座

職名

教授

学位

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

学歴 2

東京大学大学院　理学系研究科　天文学専攻

1992年4月～ 1997年3月
京都大学　理学部　宇宙物理学教室

1988年4月～ 1992年3月

所属学協会 1

日本天文学会

研究キーワード 3

銀河進化
銀河形成
銀河天文学

研究分野 1

自然科学一般 / 天文学 / 銀河天文学

論文 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年11月1日

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年8月5日
出版者・発行元： 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年7月18日
出版者・発行元： 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年5月29日
出版者・発行元： 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年3月1日
出版者・発行元： 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年2月1日

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年2月1日

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年1月1日

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年12月1日

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年11月1日

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年10月14日

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

Zhaoran Liu, Takahiro Morishita, Tadayuki Kodama

The Astrophysical Journal　955　(1)　29-29　2023年9月1日
出版者・発行元： 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 査読有り

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年1月1日
出版者・発行元： 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 査読有り

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年12月

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 査読有り

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

Astronomy & Astrophysics　666　A141-A141　2022年10月18日
出版者・発行元： 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 査読有り

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年9月29日
出版者・発行元： 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年8月30日
出版者・発行元： 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年8月27日
出版者・発行元： 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 査読有り

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年7月1日
出版者・発行元： 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 査読有り

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年4月

DOI： 10.1093/pasj/psab122 　

ISSN：0004-6264

eISSN：2053-051X
Do blue galaxy-clusters have hot intracluster gas? 査読有り

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年3月2日
出版者・発行元： 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 査読有り

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年2月1日

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 査読有り

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年1月10日

DOI： 10.3847/1538-4357/ac34fa 　

ISSN：0004-637X

eISSN：1538-4357
FOREVER22: galaxy formation in protocluster regions 査読有り

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年12月3日
出版者・発行元： 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 査読有り

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年8月
出版者・発行元： 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 査読有り

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年8月
出版者・発行元： EDP Sciences
DOI： 10.1051/0004-6361/202040232 　

ISSN：0004-6361

eISSN：1432-0746

詳細を見る詳細を閉じる

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年6月1日
出版者・発行元： 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? 査読有り

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

The Astrophysical Journal　2021年6月1日

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

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年4月1日
出版者・発行元： 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 査読有り

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年3月1日
出版者・発行元： 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 査読有り

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年2月1日
出版者・発行元： 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年12月13日
出版者・発行元： 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年12月13日
出版者・発行元： 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 査読有り

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年12月3日
出版者・発行元： American Astronomical Society
DOI： 10.3847/1538-4357/abc174 　

eISSN：1538-4357
CHORUS. I. Cosmic HydrOgen Reionization Unveiled with Subaru: Overview 査読有り

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年11月6日
出版者・発行元： 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 査読有り

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年9月23日
出版者・発行元： 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 査読有り

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年8月12日
出版者・発行元： 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 査読有り

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年8月1日
出版者・発行元： 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 査読有り

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

Astronomy & Astrophysics　638　A138-A138　2020年6月
出版者・発行元： 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 査読有り

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年5月14日
出版者・発行元： American Astronomical Society
DOI： 10.3847/1538-4357/ab86a8 　

eISSN：1538-4357
ULTIMATE-Subaru: enhancing the Subaru's wide-field capability with GLAO 査読有り

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年1月3日
出版者・発行元： SPIE
DOI： 10.1117/12.2560539 　
Kinematics of disk galaxies in (proto-)clusters at z = 1.5 査読有り

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年1月
出版者・発行元： 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 査読有り

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年12月1日
出版者・発行元： 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 査読有り

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年11月21日

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 査読有り

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年9月24日

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 査読有り

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

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN　71　(4)　2019年8月1日

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 査読有り

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

The Astrophysical Journal　877　(2)　118-118　2019年6月3日
出版者・発行元： 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 査読有り

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

Astronomy & Astrophysics　626　A14-A14　2019年6月
出版者・発行元： 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年6月
出版者・発行元： 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 査読有り

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年6月1日

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? 査読有り

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

ASTROPHYSICAL JOURNAL　874　(2)　142-142　2019年4月2日

DOI： 10.3847/1538-4357/ab0e75 　

ISSN：0004-637X

eISSN：1538-4357
Environmental impacts on molecular gas in protocluster galaxies at z ∼ 2 査読有り

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年4月1日

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 査読有り

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年3月20日

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 査読有り

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年3月7日

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 査読有り

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年3月7日

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 査読有り

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

Publications of the Astronomical Society of Japan　71　(1)　2019年1月

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 査読有り

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年12月

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 査読有り

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年12月

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 査読有り

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年11月10日

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 査読有り

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年10月

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 査読有り

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年7月10日

DOI： 10.1117/12.2314085 　

ISSN：0277-786X
Molecular gas reservoirs in cluster galaxies at z=1.46 査読有り

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年3月1日

DOI： 10.3847/1538-4357/aab3e7 　

ISSN：0004-637X
ALMA 26 arcmin(2) Survey of GOODS-S at One-millimeter (ASAGAO): X-Ray AGN Properties of Millimeter-selected Galaxies 査読有り

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

ASTROPHYSICAL JOURNAL　853　(1)　2018年1月

DOI： 10.3847/1538-4357/aa9f10 　

ISSN：0004-637X
MAHALO Deep Cluster Survey I. Accelerated and enhanced galaxy formation in the densest regions of a protocluster at z = 2.5 査読有り

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年1月1日

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 査読有り

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年1月1日

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 査読有り

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年1月1日

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 査読有り

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年1月1日

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 査読有り

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年1月1日

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 査読有り

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年

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 査読有り

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年12月

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 査読有り

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年11月

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 査読有り

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年11月

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 査読有り

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年10月

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 査読有り

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年7月

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年6月
出版者・発行元： 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 査読有り

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年6月

DOI： 10.1093/mnras/stx091 　

ISSN：0035-8711

eISSN：1365-2966
Direct evidence for Ly alpha depletion in the protocluster core 査読有り

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年6月

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 査読有り

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年5月29日

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 査読有り

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年5月7日

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 査読有り

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年3月29日

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年
出版者・発行元： Instituto de Astrofisica de Canarias
The SXDF-ALMA 2-arcmin² Deep Survey: Stacking Rest-frame Near-infrared Selected Objects 査読有り

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年12月16日

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年10月11日
出版者・発行元： 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 査読有り

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年9月28日

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 査読有り

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年9月

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 査読有り

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年8月18日

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 査読有り

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

ASTROPHYSICAL JOURNAL LETTERS　826　(2)　2016年8月

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 査読有り

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年7月8日

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 査読有り

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年7月

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 査読有り

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年6月

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年
Toward unveiling internal properties of HII regions and their connections at the cosmic noon era 査読有り

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年

DOI： 10.1017/S1743921315010030 　

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

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年12月

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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 査読有り

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年10月

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 査読有り

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

ASTRONOMY & ASTROPHYSICS　581　2015年9月

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 査読有り

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年8月24日

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 査読有り

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年8月

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 査読有り

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年6月

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 査読有り

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年6月

DOI： 10.1088/0004-637X/806/2/208 　

ISSN：0004-637X

eISSN：1538-4357
Thirty Meter Telescope Detailed Science Case: 2015 査読有り

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年5月5日

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 査読有り

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年3月

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 査読有り

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年3月

DOI： 10.1093/mnras/stv051 　

ISSN：0035-8711

eISSN：1365-2966
DISCOVERY OF NINE EXTENDED IONIZED GAS CLOUDS IN A z=0.4 CLUSTER 査読有り

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

ASTRONOMICAL JOURNAL　149　(2)　2015年2月

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 査読有り

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

The Astronomical Journal　149　(2)　36　2015年1月
出版者・発行元： {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) 査読有り

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

ASTROPHYSICAL JOURNAL　795　(1)　2014年11月

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 査読有り

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

ASTROPHYSICAL JOURNAL　789　(1)　2014年7月

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 査読有り

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年6月

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 査読有り

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年4月

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 査読有り

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年3月1日

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 査読有り

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年2月

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 査読有り

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年
出版者・発行元： Blackwell Publishing Ltd
DOI： 10.1093/mnrasl/slu029 　

ISSN：1745-3933 1745-3925
ULTIMATE-SUBARU: project status 査読有り

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年

DOI： 10.1117/12.2055042 　

ISSN：0277-786X
ULTIMATE-SUBARU: simulation update 査読有り

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年

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 査読有り

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

ASTROPHYSICAL JOURNAL　780　(1)　2014年1月

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 査読有り

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

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

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 査読有り

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年

DOI： 10.1017/S1743921314009892 　

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

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年

DOI： 10.1017/S1743921314009818 　

ISSN：1743-9221 1743-9213
A fundamental metallicity relation for galaxies at z=0.84-1.47 from HiZELS 査読有り

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年12月

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 査読有り

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

ASTROPHYSICAL JOURNAL　778　(2)　2013年12月

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 査読有り

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年10月

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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 査読有り

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年10月

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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 査読有り

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年9月

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 査読有り

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

ASTROPHYSICAL JOURNAL　772　(2)　2013年8月

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. 国際誌査読有り

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年6月

DOI： 10.1016/j.ajpath.2013.02.024 　

ISSN：0002-9440
PROBING OF THE INTERACTIONS BETWEEN THE HOT PLASMAS AND GALAXIES IN CLUSTERS FROM z=0.1 TO 0.9 査読有り

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年4月

DOI： 10.1088/0004-637X/767/2/157 　

ISSN：0004-637X
Re-evaluating hot Jupiter WASP-12b: An update 査読有り

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

HOT PLANETS AND COOL STARS　47　2013年

DOI： 10.1051/epjconf/20134713005 　

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

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年1月

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 査読有り

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

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

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 査読有り

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

ASTROPHYSICAL JOURNAL　760　(2)　2012年12月

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 査読有り

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

ASTROPHYSICAL JOURNAL　757　(1)　2012年9月

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 査読有り

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年8月25日

DOI： 10.1093/pasj/64.4.l2 　

ISSN：2053-051X
Initial Results from Nobeyama Molecular Gas Observations of Distant Bright Galaxies 査読有り

lONO 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.

PASJ : publications of the Astronomical Society of Japan　64　(4)　"L2-1"-"L2-4"　2012年8月25日
出版者・発行元： 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 査読有り

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

Proceedings of the International Astronomical Union　8　(295)　74-77　2012年8月

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 査読有り

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年8月

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 査読有り

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年7月

DOI： 10.1111/j.1365-2966.2012.21063.x 　

ISSN：0035-8711

eISSN：1365-2966
WISH for deep and wide NIR surveys 査読有り

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年

DOI： 10.1117/12.925632 　

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

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年

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年9月

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 査読有り

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

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　415　(3)　2670-2687　2011年8月

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 査読有り

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

ASTROPHYSICAL JOURNAL　734　(1)　2011年6月

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 査読有り

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年5月

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 査読有り

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年3月

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 査読有り

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

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN　63　S437-S446　2011年3月

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年
出版者・発行元： 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 査読有り

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年11月

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 査読有り

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年6月

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年5月3日

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 査読有り

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年4月

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 査読有り

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

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　402　(3)　1980-1990　2010年3月

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 査読有り

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年1月

DOI： 10.1051/0004-6361/200912868 　

ISSN：0004-6361
WISH: Wide-field Imaging Surveyor for High-redshift 査読有り

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年

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年11月

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 査読有り

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

ASTROPHYSICAL JOURNAL　697　(2)　1369-1383　2009年6月

DOI： 10.1088/0004-637X/697/2/1369 　

ISSN：0004-637X
DISCOVERY OF A GIANT Ly alpha EMITTER NEAR THE REIONIZATION EPOCH 査読有り

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年5月

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 査読有り

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年3月

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 査読有り

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年
VizieR Online Data Catalog: Subaru/XMM-Newton deep survey IV. (SXDS) (Ouchi+, 2008) 査読有り

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年
Unveiling the Hidden Star Formation Activity in and around Distant Clusters of Galaxies with AKARI 査読有り

Yusei Koyama, Tadayuki Kodama

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

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年12月

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 査読有り

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年6月

DOI： 10.1086/527673 　

ISSN：0067-0049

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

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年5月

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年
Dark-Halo Masses, Star Formation Rates, and Stellar Masses of High-Redshift Galaxies 査読有り

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年
Proto-Clusters at z >> 1 as the Site of Early-Type Galaxies Formation 査読有り

Tadayuki Kodama

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

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

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

Fumiaki Nakata, Tadayuki Kodama, Masayuki Tanaka

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

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年
Galaxy evolution viewed as functions of environment and mass 査読有り

Tadayuki Kodama, Masayuki Tanaka, Ichi Tanaka, Masaru Kajisawa

MAPPING THE GALAXY AND NEARBY GALAXIES　296-+　2008年

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 査読有り

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

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

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 査読有り

Masayuki Tanaka, Takako Hoshi, Tadayuki Kodama, Nobunari Kashikawa

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　379　(4)　1546-1556　2007年8月

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 査読有り

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年6月

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 査読有り

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年5月

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) 査読有り

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年4月

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 査読有り

Ly, C, Malkan, M. A, Kashikawa, N, Shimasaku, K, Doi, M, Nagao, T, Iye, M, Kodama, T, Morokuma, T, Motohara, K

The Astrophysical Journal　657　(2)　738-759　2007年3月10日

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 査読有り

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年3月

DOI： 10.1086/510828 　

ISSN：0004-637X

eISSN：1538-4357
Errata : The SUBARU Deep Field Project: Lyman-alpha Emitters at a Redshift of 6.6 査読有り

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　59　(1)　277-277　2007年2月25日

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) 査読有り

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年2月

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 査読有り

Tadayuki Kodama, Masayuki Tanaka, Ichi Tanaka, Masaru Kajisawa

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

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年12月

DOI： 10.1086/508621 　

ISSN：0004-637X

eISSN：1538-4357
Protoclusters with evolved populations around radio galaxies at z similar to 2.5 査読有り

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

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY　371　(2)　577-582　2006年9月

DOI： 10.1111/j.1365-2966.2006.10704.x 　

ISSN：0035-8711

eISSN：1365-2966
The build-up of the colour-magnitude relation 査読有り

Masayuki Tanaka, Tadayuki Kodama

Proceedings of the International Astronomical Union　2　(235)　141　2006年8月

DOI： 10.1017/S1743921306005734 　

ISSN：1743-9213 1743-9221
Panoramic views of cluster evolution since z = 3 査読有り

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

Proceedings of the International Astronomical Union　2　(235)　170-171　2006年8月

DOI： 10.1017/S1743921306005886 　

ISSN：1743-9213 1743-9221
Deep extragalactic surveys around the ecliptic poles with AKARI (ASTRO-F) 査読有り

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年8月

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 査読有り

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

Monthly Notices of the Royal Astronomical Society　369　(4)　1929-1938　2006年7月

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年3月

DOI： 10.1111/j.1365-2966.2006.10001.x 　

ISSN：0035-8711
Spectroscopically confirmed large-scale structures associated to a z = 0.83 cluster 査読有り

Masayuki Tanaka, Tadayuki Kodama, Nobuo Arimoto, Ichi Tanaka

Monthly Notices of the Royal Astronomical Society　365　(4)　1392-1404　2006年2月

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 査読有り

Kashikawa, N, Yoshida, M, Shimasaku, K, Nagashima, M, Yahagi, H, Ouchi, M, Matsuda, Y, Malkan, M. A, 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

The Astrophysical Journal　637　(2)　631-647　2006年

DOI： 10.1086/498403 　
The build-up of the colour-magnitude relation as a function of environment 査読有り

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年9月1日

DOI： 10.1111/j.1365-2966.2005.09300.x 　

ISSN：0035-8711
The SUBARU Deep Field Project: Lyman-alpha Emitters at a Redshift of 6.6 査読有り

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年2月25日

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年

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

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年

DOI： 10.1086/428499 　

ISSN：0004-637X
Panoramic Views of Cluster-Scale Assemblies Explored by Subaru Wide-Field Imaging 査読有り

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年

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 査読有り

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

\pasj　57　(6)　877-880　2005年
出版者・発行元： Astronomical Society of Japan
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 査読有り

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

20229　2005年
The Number Density of Old Passively Evolving Galaxies atz = 1 in the Subaru/XMM‐NewtonDeep Survey Field 査読有り

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年

DOI： 10.1086/496954 　

ISSN：0004-637X

eISSN：1538-4357
The Subaru Deep Field: The Optical Imaging Data 査読有り

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年12月25日

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年2月1日
出版者・発行元： 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年
出版者・発行元： Sissa Medialab Srl
ISSN：1824-8039
ERO R1 in the field of CL0939+4713 -- Evidence for an S0-like galaxy at z̃1.5 査読有り

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

Dark Matter in Galaxies　220　(220)　181-182　2004年

ISSN：0074-1809
Optical spectropolarimetry of SN 2002ap with Subaru telescope 査読有り

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年
A Strong Ly-alpha Emitter at z = 6.33 in the Subaru Deep Field Selected as an i'-Dropout 査読有り

Nagao, T, Taniguchi, Y, Kashikawa, N, Kodaira, K, Kaifu, N, Ando, H, Karoji, H, Ajiki, M, 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, 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

The Astrophysical Journal　613　(1)　L9-L12　2004年

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

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年12月

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 査読有り

Tadayuki Kodama, Richard Bower

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

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 査読有り

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年6月

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 査読有り

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年6月
出版者・発行元： {IOP} Publishing
DOI： 10.1086/375146 　

ISSN：0004-637X
The Discovery of Two Lyman-alpha Emitters beyond Redshift 6 in the Subaru Deep Field 査読有り

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年4月25日

DOI： 10.1093/pasj/55.2.l17 　

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

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年11月

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 査読有り

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

Astrophysical Journal　577　(2)　L89-L92　2002年10月1日
出版者・発行元： 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 査読有り

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年4月1日

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年
Testing the hypothesis of the morphological transformation from field spiral to cluster S0 査読有り

Tadayuki Kodama, Ian Smail

Monthly Notices of the Royal Astronomical Society　326　(2)　637-642　2001年9月11日

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年2月11日
出版者・発行元： 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 査読有り

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年
出版者・発行元： 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 査読有り

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年
出版者・発行元： Astronomical Society of Japan
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年1月

DOI： 10.1086/308156 　

ISSN：0004-637X
Origin of color gradients in elliptical galaxies 査読有り

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

Astronomical Journal　119　(5)　2134-2145　2000年
出版者・発行元： 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年

ISSN：0074-1809
Secondary episodes of star formation in elliptical galaxies 査読有り

Tadayuki Kodama, Nobuo Arimoto

Monthly Notices of the Royal Astronomical Society　300　(1)　193-199　1998年10月11日
出版者・発行元： 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年
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年10月

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年4月1日

ISSN：0004-6361

︎全件表示 ︎最初の5件までを表示

MISC 29

GREX-PLUS Science Book

GREX-PLUS Science Team, Akio K. Inoue, Yuichi Harikane, Takashi Moriya, Hideko Nomura, Shunsuke Baba, Yuka Fujii, Naoteru Gouda, Yasuhiro Hirahara, Yui Kawashima, Tadayuki Kodama, Yusei Koyama, Hiroyuki Kurokawa, Taro Matsuo, Yoshiki Matsuoka, Shuji Matsuura, Ken Mawatari, Toru Misawa, Kentaro Nagamine, Kimihiko Nakajima, Shota Notsu, Takafumi Ootsubo, Kazumasa Ohno, Hideo Sagawa, Takashi Shimonishi, Ken-ichi Tadaki, Michihiro Takami, Tsuyoshi Terai, Yoshiki Toba, Takuji Yamashita, Chikako Yasui

arXiv e-Print　2023年4月

DOI： 10.48550/arXiv.2304.08104 　
Ruby-Rush:z~5の原始銀河団で加速的に誕生する巨大銀河の探査

高橋宏典, 児玉忠恭, 大工原一貴, 岡崎莉帆, 小西真大, 利川潤, 但木謙一, 小山佑世, 本原顕太郎

日本天文学会年会講演予稿集　2023　2023年

ISSN： 1347-0639
z~2における原始銀河団形成初期の構造と星形成銀河の性質

大工原一貴, 兒玉忠恭, 日下部晴香, 田中壱, 本原顕太郎, 小山佑世, 小西真広, 福島啓太, 嶋川里澄, 梅畑豪紀

日本天文学会年会講演予稿集　2023　2023年

ISSN： 1347-0639
Ruby-Rush:z~5プロトクラスターにおけるレッドモンスターの加速進化

高橋宏典, 児玉忠恭, 大工原一貴, 岡崎莉帆, 小西真大, 但木謙一, 利川潤, 小山佑世, 本原顕太郎

日本天文学会年会講演予稿集　2023　2023年

ISSN： 1347-0639
深狭帯域撮像観測で探るz~2における小質量銀河の星形成活動

大工原一貴, 児玉忠恭, MARTINEZ Jose Manuel Perez, 鈴木智子, 嶋川里澄

日本天文学会年会講演予稿集　2022　2022年

ISSN： 1347-0639
特異な対狭帯域イメージングにより追跡したz=0.9超クラスタにおける大規模構造と銀河進化【JST・京大機械翻訳】

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年

ISSN： 1347-0639
HSCで探る銀河団

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年

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年

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

小山佑世, 松木康裕, 小山舜平, 中川貴雄, 松原英雄, 瀧田怜, 山下拓時, 諸隈佳菜, 児玉忠恭, 嶋川里澄, 竝木茂朗, 林将央, 但木謙一, 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

宇宙航空研究開発機構特別資料 = JAXA Special Publication: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life　(17)　205-208　2018年3月9日
出版者・発行元：宇宙航空研究開発機構(JAXA)
ISSN： 2433-2232

詳細を見る詳細を閉じる

第4回「あかり」国際会議 (2017年10月17-20日. 東京大学), 文京区, 東京形態: カラー図版あり資料番号: AA1730026034レポート番号: JAXA-SP-17-009E
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年

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年

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年

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年

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年2月20日

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年

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年

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年

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年

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年

ISSN： 1347-0639
z=2.48の原始銀河団におけるダスト星形成銀河に対するサブミリ/IR観測

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年

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年

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年

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年

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年

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年3月

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年11月11日

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年5月

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年1月

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年3月

ISSN： 0004-6256

︎全件表示 ︎最初の5件までを表示

講演・口頭発表等 37

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

Tadayuki Kodama

A journey through galactic environments　2023年9月25日
Panoramic views of cluster formation and evolution across cosmic time

Tadayuki Kodama

First structure 2023　2023年9月5日
HSC-MBF + ULTIMATE-MBF for cluster/LSS studies 招待有り

Tadayuki Kodama

HSC MBF Workshop　2023年9月1日
Panoramic and sharp views of galaxy and cluster formation and evolution with ULTIMATE-Subaru

Tadayuki Kodama

APRIM2023　2023年8月11日
Outstanding issues on galaxy cluster formation and evolution 招待有り

Tadayuki Kodama

ILR kickoff meeting　2023年5月31日
HySPEC-Euclid: Hybrid Search for Proto Evolving Clusters with Euclid

Tadayuki Kodama

JEC kick-off meeting　2023年4月28日
Rise and Fall of Star Formation in Clusters/Proto-clusters 招待有り

Tadayuki Kodama

ESA-ESO workshop: Euclid Galaxy Evolution　2022年10月26日
Accelerated galaxy formation and quenching in distant clusters 招待有り

Tadayuki Kodama

Alvio@80　2022年9月9日
Remaining Key Questions on Galaxy Cluster Formation and Evolution 招待有り

Tadayuki Kodama

In situ view of galaxy formation 2　2022年7月29日
Superb Wide-field Imaging Multi-colour Survey with 18 Filters 招待有り

Tadayuki Kodama, SWIMS, eam

Massive galaxies and clusters in the early Universe　2021年11月15日
Panoramic views of cluster formation and evolution across cosmic time 招待有り

Tadayuki Kodama

Colloquium, Univ. of Vienna　2021年10月25日
Superb Wide-field Imaging Multi-colour Survey with 18 Filters 招待有り

Tadayuki Kodama, SWIMS-18 team

Super-IRnet Seminar　2021年10月8日
初代星・初代銀河研究会 2020 招待有り

児玉忠恭

初代星・初代銀河研究会 2020　2020年11月18日
DISCUSSION 3: Evolutionary Scenarios 招待有り

Kodama, Tadayuki

Protoclusters: galaxies in confinement　2020年9月3日
Quenching history of galaxies at z<2 probed by PFS2 招待有り

Kodama, Tadayuki

GOGREEN/GCLASS Data Release and Workshop　2020年8月27日
HSC2+PFS2, SWIMS and ULTIMATE surveys of galaxy clusters at 0.5<z<5 招待有り

Kodama, Tadauyki

GOGREEN/GCLASS Data Release and Workshop　2020年8月26日
Past 20 years of panoramic studies of distant clusters with Subaru and the Future 国際会議招待有り

Kodama, Tadayuki

Optical & Infrared Astronomy for the Next Decade　2019年11月20日
Revealing the build-up of large scale structures and galaxy populations therein with PFS2 国際会議招待有り

Kodama, Tadayuki

Optical & Infrared Astronomy for the Next Decade　2019年11月19日
Gas and star formation in proto-clusters at z>1.5 and the future prospects 国際会議招待有り

兒玉忠恭

First Galaxies, First Structures　2019年10月24日
HSC distant cluster search (HSC^2) and future prospects with PFS^2 招待有り

兒玉忠恭

The 3rd HSC-X cluster workshop　2019年9月18日
Transition of gas accretion mode in proto-clusters at the cosmic noon 招待有り

Kodama, Tadayuki

Colloquium (Padova Observatory)　2019年7月15日
Transition of gas accretion mode to clusters at z~2 国際会議

兒玉忠恭

Tracing Cosmic Evolution with Clusters of Galaxies　2019年7月11日
SWIMS-18, PFS^2, and ULTIMATE-K 招待有り

兒玉忠恭

我が国の赤外線広視野観測サイエンスの戦略と展望　2019年7月2日
SWIMS-18, PFS2, and ULTIMATE-K 招待有り

Kodama, Tadayuki

我が国の赤外線広視野観測サイエンスの戦略と展望　2019年7月2日
Big and sharp eyes on galaxy cluster formation and evolution across cosmic times 国際会議招待有り

兒玉忠恭

Extremely Big Eyes on the Early Universe　2019年3月26日
Galaxy quenching explored with HSC^2, PFS^2, and ULTIMATE-K 国際会議招待有り

兒玉忠恭

Panchromatic and Panoramic Studies of Galaxy Clusters　2019年3月11日
Transition of gas accretion mode in proto-clusters at the cosmic noon 国際会議

兒玉忠恭

Australia-ESO confenrence 2019　2019年2月20日
Synergetic studies of distant clusters between Canada and Subaru 国際会議招待有り

兒玉忠恭

Canada-Subaru workshop　2018年10月12日
Galaxy cluster formation revealed by Mahalo-Subaru and Gracias-ALMA 国際会議招待有り

兒玉忠恭

Chile-Japan Academic Forum 2018　2018年9月27日
Gracias-ALMA: Molecular gas in massive galaxies and its environmental dependence at the cosmic noon 国際会議

兒玉忠恭

Birth, life and fate of massive galaxies and their central beating heat　2018年9月5日
Cluster Science with ELTs 国際会議招待有り

兒玉忠恭

EArly Science with ELTs (EASE)　2018年8月31日
High-z imaging science with ULTIMATE-Subaru 招待有り

兒玉忠恭

ULTIMATE-Subaru Collaboration Meeting　2018年1月16日
Mass aseembly, star formation, and morphology/size evolution at 1<z<4 and beyond 国際会議招待有り

兒玉忠恭

WFIRST-Subaru Synergistic Observation Workshop　2017年12月19日
A gas-rich proto-cluster in making at z~2.5 国際会議招待有り

兒玉忠恭

Sharp Views of Galaxy Formation and Evolution (Germany-Japan (DAAD-JSPS) workshop)　2017年11月2日
Hybrid Search for Clusters with HSC (HSC^2) 招待有り

兒玉忠恭

HSC-X銀河団研究会　2017年8月4日
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

兒玉忠恭

光赤天連シンポ2017　2017年7月25日
Enhanced Lyα depletion in the proto-cluster cores at z=2.5 国際会議

兒玉忠恭

Early Stages of Galaxy Cluster Formation (GCF2017)　2017年7月21日

︎全件表示 ︎最初の5件までを表示

共同研究・競争的資金等の研究課題 19

宇宙における天体と構造の形成史の統一的理解

宮崎聡, 栗田光樹夫, 宮武広直, 小山佑世, 長峯健太郎, 美濃和陽典, 大栗真宗, 西澤淳, 児玉忠恭, 本原顕太郎, 播金優一

提供機関：Japan Society for the Promotion of Science

制度名：Grants-in-Aid for Scientific Research

研究種目：Fund for the Promotion of Joint International Research (International Leading Research )

研究機関：National Astronomical Observatory of Japan

2022年12月20日～ 2029年3月31日

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本研究の目的は、宇宙の最初期に誕生した星がやがて銀河を形成し、その中でどのように大質量ブラックホールが形成され、やがて銀河団へと成長してきたのか、という宇宙の様々な時代における構造の形成史について、最新の観測機器を用いて統一的・連続的に理解することにある。我が国の研究者はこれまでに主としてすばる望遠鏡の観測装置を用い、世界の一線級の成果をあげてきているが、本研究の目標を達成するにはすばる望遠鏡だけでは不十分である。そこで、国立天文台・名古屋大学・千葉大学・大阪大学・京都大学・東北大学に所属する、理論・観測・実験という幅広い分野にまたがる研究者組織を構築した。そして、米アリゾナ大学、米プリンストン大学、伊国立天文学研究所、豪国立大学等の研究者と共同研究を推進することで合意した。JWST、Rubin、Roman, ELT等の世界最高峰の次世代観測装置を使って研究している、あるいは新装置を開発中の研究機関に若手研究者を送り込み、我が国の国際化を図るとともに、光赤外線天文学分野における世界のトップランナーの地位を次の時代においても堅持することを目標としている。当分野の院生の長期海外渡航経験率は現状では10%程度であるが、これを本課題研究完了時までに50%に引き上げることを目標とし、更にプログラム終了後も若手研究者によるセルフメンター制を構築することで、持続可能な国際化の潮流を作ることを目指す。
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

2025年4月～ 2029年3月
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

2023年4月1日～ 2026年3月31日
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

2021年4月5日～ 2026年3月31日
近赤外線広波長帯域面分光観測による最盛期銀河形成活動の探求

本原顕太郎, 小西真広, 児玉忠恭, 尾崎忍夫, 小山佑世, 林将央

提供機関：Japan Society for the Promotion of Science

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

研究種目：Grant-in-Aid for Scientific Research (A)

研究機関：National Astronomical Observatory of Japan

2020年4月1日～ 2025年3月31日

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(1) SWIMSのすばる望遠鏡に取り付けてのPI共同利用観測については2021年4月より開始した。2022年3月までに、2021年A,2021年B期の２期にわたって合計14件の観測提案が採択され、55夜の観測を実行した。これら観測は新規に雇用した研究員である小山が中心となり、本原、分担研究者の小西、児玉、および研究協力者である高橋、田中、寺居の支援を受けつつ行われた。 (2) z~2の低質量星形成銀河の多天体分光についても2021年B期の共同利用に応募して採択され、2022年2月に観測を実行した。 (3) 面分光ユニット(IFU)の開発については、2020年度に試作したスライスミラーおよび球面鏡の本製作を大学院生の櫛引と研究協力者である理化学研究所の細畠、竹田が山形および東京電機大学の森田の協力のもとに行なった。試作で明らかになった問題点を改善することにより、目標の形状を持つ素子の製作に成功した。また、拡大光学系のレンズホルダの設計制作も行った。さらに、調整なしで組み上げることを目標として、超精密切削加工技術によりこれら部品を組み上げるベースプレート形状の精密加工を行った。これで、IFUのすべてのコンポーネントの制作が完了した。 2021年度後半よりこれらの組み立て調整と実験室での性能評価を大学院生の櫛引と研究分担者の尾崎が行なった。国立天文台先端技術センターですばる望遠鏡からの出射光を模した調整用光学系を構成してこれを用いた。当初設計通り、IFUがほぼ微調整なしで要求通りの光学性能を持つことが確認できた。 2022年初頭にIFUをハワイ観測所に輸送し、すばる望遠鏡で運用しているSWIMSに搭載しての機能試験観測を2021年度末に実施した。実際に星を導入したファーストライト観測に成功した。これを受けて、2022年B期のすばる望遠鏡でのPI共同利用観測に供されることが承認された。
銀河形成の加速と減速を司る物理過程の実証的解明

児玉忠恭, 矢島秀伸, 林将央, 小山佑世, 小野寺仁人, 田中壱, 海老塚昇, 本原顕太郎

提供機関：Japan Society for the Promotion of Science

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

研究種目：Grant-in-Aid for Scientific Research (A)

研究機関：Tohoku University

2018年4月1日～ 2023年3月31日

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本提案は、これまでにない高い感度を持つ中分散グリズムを開発し、それを用いた分光観測を行うことによって、遠方銀河の星形成史を明らかにしようというものである。この新しい高感度グリズムは一昨年度までに完成しすばる望遠鏡のMOIRCS装置にインストールされており、昨年度はテスト観測でのチェックのあと、すばる共同利用観測でこのグリズムを用いた分光観測データを取得している。このデータ解析を進めるとともに、密接に関連する遠方銀河の狭帯域撮像観測、中間帯域観測、可視と近赤外の分光観測を主にすばる望遠鏡とKeck望遠鏡を使って進めた。複数の輝線を用いた星形成銀河の輝線診断や、バルマーブレークを捉えた古い星種族の銀河、その中間の星形成をちょうど止めつつある銀河などの解析を行い、銀河がいつどのようにして星形成活動を活発化させ、その後止めたのか、またそれに及ぼす環境の効果について、研究を行なった。これらは上述の本グリズムで取得した分光スペクトルを元に現在解析を進めている星形成史の研究と相補的である。なお、本グリズムが搭載されているMOIRCS装置は現在国立天文台のすばる観測所の方針により休眠中で、時限的（2023年1月までの2年間）にSWIMSという新しくかつMOIRCSと類似した装置が現在すばる望遠鏡に取り付けられている。MOIRCSはその後交代で再びすばる望遠鏡に取り付けられることになっており、その間本課題のグリズムを用いた観測ができないため、類似装置SWIMSをメインに使った、密接に関連した観測プログラムを進めている。
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

2019年4月1日～ 2022年3月31日

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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。
3次元分光で探る星形成活動研究のための近赤外波長可変狭帯域フィルターの開発

高橋英則, 美濃和陽典, 児玉忠恭

提供機関：Japan Society for the Promotion of Science

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

研究種目：Grant-in-Aid for Scientific Research (B)

研究機関：The University of Tokyo

2018年4月1日～ 2022年3月31日

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本研究の課題は、赤外線観測用波長走査型フィルター（チューナブルフィルター）を開発し、大口径望遠鏡の観測装置の前置光学モジュールとして搭載、その実用可能性を示すことにある。科学的には、大規模星形成領域の物理状態を銀外系内の星団レベルから近傍・遠方銀河まで広い空間ダイナミックレンジを、近赤外線波長全域に渡って連続的に高空間分解能の観測を行い、星形成活動の物理過程を調査、大質量星や銀河の進化を解明することを最終的な目的としている。そのための開発要素として、近赤外線波長域に最適化された光学素子（エタロン）の設計・製作と、波長走査のための駆動機構および測距機構の開発が必須となる。本研究ではこれまでに、ファブリ・ペローエタロンの光学設計を行い、成膜工程を工夫することで、フィネスを稼ぐ以外に吸収率を可能な限り抑え、近赤外線波長全域（1-2.5ミクロン）に渡ってフラットな反射特性を低温で実現する大口径の多層膜を有した素子の製作に成功した。面分光チューナブルフィルターを実現するためには、平行におかれた2枚のエタロンの平行度を保持しつつ、微小距離の走査する機構が必要になる。具体的には、観測波長（1~2ミクロン）程度エタロン間隔を変化させる必要があり、さらにその1/10程度の精度が必要となる。世界的な半導体不足の煽りを受け、圧電素子（ピエゾ素子）の入手が困難な状況であったが、逆に十分に検討する時間を得たことにより、本目的に最適と思われる素子を選定・入手することができた。さらに分光器に光学素子のギャップ間を測定するための静電容量センサーを採用、これをクローズドループ制御することで、常にエタロンの間隔・平行性を維持しながら波長走査を行うことが可能になった。各コンポーネントが揃ったことで、前置光学系として最適化された分光モジュールの詳細設計も進められた。
広波長帯域赤外線分光装置による銀河進化の観測的研究

本原顕太郎, 尾崎忍夫, 児玉忠恭

提供機関：Japan Society for the Promotion of Science

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

研究種目：Grant-in-Aid for Scientific Research (A)

研究機関：The University of Tokyo

2015年4月1日～ 2020年3月31日

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・SWIMSのすばる望遠鏡でのファーストライト観測：当年度5月末にすばる望遠鏡に取り付け、ファーストライト観測に成功した。一部フィルタホイールに不具合があったものの、ほぼ設計通りの結像性能及び効率を持っていることを確認することができた。年度半ばに各種不具合の修理などを行い、1月末に2度目の試験観測を行った。これによりSWIMSのすべての撮像機能が正常に動作することを確認できた。また、スリットマスクを用いた多天体分光にも成功し、分光機能についても問題ないことを確認した。・面分光ユニットの開発：年度初頭より、理化学研究所に新規導入された新型の超精密加工機による試験加工を行い、面粗さが10nm以下での球面加工が実現できることを実証した。これを受けて12月に理化学研究所の超精密加工機を用い通常のアルミ材を加工して、5mm各程度のミラー面を26面持つスリットミラーアレイの試作を行った。これにより洗い出された加工手順を修正後、2月に特殊アルミRSA6061を加工して、本番用のスリットミラーアレイの製作を行った。完成したスリットミラーアレイの形状評価を行ったところ、ミラー面粗さ10nm未満、面形状はP-Vで300nm未満、各ミラー面の相対位置誤差5um以下、というほぼ要求仕様を持つミラーアレイとなっていることが確認できた。これにより、超精密加工によって面分光ユニットのミラーアレイが製造できることを実証することができた。これと並行して、面分光ユニットの光学系を保持する構造体の検討を行い、その設計を完了した。・成果発表：これまでの開発で得られた成果は、2018年6月に米国で開催されたSPIEで発表し、論文として公表した。
すばる望遠鏡による新近赤外線装置の１８バンド多色撮像で極める銀河形成の絶頂期

児玉忠恭, 林将央, 田中壱, 本原顕太郎, 本原顕太郎, 小西真広, 小山佑世, 但木謙一, 利川潤, 嶋川里澄, 鈴木智子, 山元萌黄

提供機関：Japan Society for the Promotion of Science

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

研究種目：Grant-in-Aid for Scientific Research (A)

研究機関：National Astronomical Observatory of Japan

2012年4月1日～ 2017年3月31日

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宇宙では今から約百億年前に銀河形成活動が最盛期を迎えたとされ、銀河の形成・進化を解き明かす上で最も重要な時代である。本課題では新しい近赤外カメラSWIMSに大量の中間帯域及び狭帯域フィルターを作成し、形成途上の銀河からの輝線やスペクトルの段差を捕えることにより、この最盛期における星形成活動と質量集積過程の時間変化を解き明かすための超多色撮像観測を可能にした。そして期待される各フィルターでの感度を元に、大規模なサーベイ観測の視野と深さの最適化を行った。またこの実施に備えて、すばるやアルマ望遠鏡を用いて銀河形成最盛期の銀河について様々な観測的研究を実施し、２６本の主要査読論文として成果発表した。
広視野多天体分光・面分光で探る銀河形態の起源

有本信雄, 西村徹郎, 岩田生, 田中壱, 兒玉忠恭, 臼田知史, 大屋真, 石垣剛, 小野寺仁人

提供機関：Japan Society for the Promotion of Science

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

研究種目：Grant-in-Aid for Scientific Research (S)

研究機関：National Astronomical Observatory of Japan

2011年4月1日～ 2015年3月31日

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宇宙における星形成活動はビッグバンから20-30億年を経た頃に最盛期を迎え、その後徐々に活動性が低下しながら渦巻き銀河や楕円銀河など、秩序ある形態が発現した。この過程を進めたのは何か。この問いに答えるため、すばる望遠鏡の近赤外線観測装置MOIRCSの機能向上を図るとともに、遠方から現在に至る銀河を詳しく調べる観測的研究を進めた。その結果、宇宙年齢20億年頃のガスを豊富に持つ銀河が活発な星形成を行い、星質量を増大させながら、宇宙年齢30億年頃までに星形成活動を終了し、静的に進化して現在の楕円銀河に至る過程を鮮やかに描き出すなど、銀河進化過程の理解に重要な知見を得ることに成功した。
超広帯域ミリ波サブミリ波観測による大規模構造の進化の研究

河野孝太郎, 川邊良平, 松原英雄, 南谷哲宏, 羽部朝男, 半田利弘, 川良公明, 田村陽一, 江澤元, 大島泰, 児玉忠恭, 伊王野大介

提供機関：Japan Society for the Promotion of Science

制度名：Grants-in-Aid for Scientific Research Grant-in-Aid for Specially Promoted Research

研究種目：Grant-in-Aid for Specially Promoted Research

研究機関：The University of Tokyo

2008年～ 2012年

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サブミリ波望遠鏡ASTEに連続波カメラを搭載し、ダストに隠された大質量の爆発的星形成銀河(サブミリ波銀河)を1400個以上新たに発見した。これらの距離や性質を調べるため、多色超伝導カメラ、および超広帯域分光観測システムを開発した。赤方偏移3.1という初期宇宙の大規模構造に付随したサブミリ波銀河の集団の発見、重力レンズによる増光を受けた極めて明るいサブミリ波銀河の発見、非常に赤方偏移の高いサブミリ波銀河候補の発見、など、大質量銀河の形成・進化について重要な知見を得ることができた。
すばる望遠鏡が俯瞰する銀河団における星形成活動の空間分布と時間発展

児玉忠恭

提供機関：Japan Society for the Promotion of Science

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

研究種目：Grant-in-Aid for Scientific Research (B)

研究機関：National Astronomical Observatory of Japan

2009年～ 2011年

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本提案で作成した狭帯域フィルターを用い、すばる望遠鏡の広視野カメラで遠方銀河団における星形成活動をマッピングする「MAHALOすばるプロジェクト」を実行した。その結果、銀河団中心部から周辺領域へと広がる、大規模構造の存在が明らかになった。また、星形成の活動性が、宇宙年齢とともに、銀河団の中心部から外側に向かって拡がっていく様子が明らかになり、銀河団銀河の形成が中心から外側へと進行してきた実態が明らかになった。
銀河と銀河団プラズマの相互作用の研究

牧島一夫, 中澤知洋, 平賀純子, 稲田直久, 国分紀秀, 川原田円, 児玉忠恭, 松下恭子, 国分紀秀, 児玉忠恭, 松下恭子

提供機関：Japan Society for the Promotion of Science

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

研究種目：Grant-in-Aid for Scientific Research (S)

研究機関：The University of Tokyo

2006年～ 2010年

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本研究の目的は、「銀河が銀河団プラズマ中を運動するさい、両者は強く相互作用し、銀河のエネルギーがプラズマへ受け渡され、銀河は落下するはず」という仮説を検証することである。X線衛星「すざく」などで観測を行なった結果、銀河団の中心では大規模な磁気構造が存在し、条件によりプラズマ加熱が起きていることを発見した。また可視光データとの比較により、宇宙年齢かけて実際に銀河が中心に落下してきた徴候も得た。
すばる望遠鏡による近赤外線狭帯域撮像で探る遠方宇宙の銀河形成史

児玉忠恭

提供機関：Japan Society for the Promotion of Science

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

研究種目：Grant-in-Aid for Young Scientists (A)

研究機関：National Astronomical Observatory of Japan

2006年～ 2008年

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すばる望遠鏡のMOIRCS装置に、専用狭帯域フィルターを2枚作成して搭載した。これらを用い、z=2.2(100億年前)とz=0.81(70億年前)の二つの時代において、星形成活動の指標であるHα輝線を出す銀河をそれぞれ探査した。その結果、z=2.2の一般領域における高い星形成活動性と、z=0.81における中間密度領域での高い星形成活動性が明らかになった。また、z=0.81では、あかり衛星の観測と組み合わせることによって、Hα輝線も抜け出て来れないほどの強い吸収を受けた星形成銀河が多数存在する可能性を示唆した。これは、従来のような紫外線や可視光だけの観測では、銀河の星形成活動をすべて捕えられていないこと意味し、赤外線での観測の重要性を物語るものである。
超極赤銀河の多波長探査による銀河進化の研究

松原英雄, 中川貴雄, 和田武彦, 有本信雄, 児玉忠恭, 川良公明

提供機関：Japan Society for the Promotion of Science

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

研究種目：Grant-in-Aid for Scientific Research (A)

研究機関：Japan Aerospace Exploration Agency

2004年～ 2007年

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本研究の目的は、最先端のスペース及び地上望遠鏡を用いて、可視光から電波領域にわたる多波長サーベイ観測を連携させることにより、「超極赤銀河」(遠方の大きな赤方偏移を受けたスペクトルを持つ銀河で、宇宙の星形成史を解明する上で重要な天体)を多数発見し、さらにその正体を探ることにある。これにより宇宙誕生から現在にいたる宇宙の星形成の歴史の解明に挑む。そこで本研究では、天空の1-5平方度の領域について可視光域〜電波領域にわたる多波長サーベイを連携的に行った。波長2-160ミクロンでのサーベイは、平成18年2月に打ち上げられた赤外天文衛星「あかり」で行った。この特徴は「広く・かつ深く、地上からできない波長をカバー」であり、これによりこれまでに知られている超極赤銀河の数に比べて桁違いに大きいサンプルを得ることができた。「あかり」は、Spitzer宇宙望遠鏡に比べて多数の連続したフィルターバンドを持つおかげで、「あかり」でしか検出不可能な、「PAH高輝度銀河」、「シリケイトブレーク銀河」といった新天体の発見や、700個にも及ぶ「極赤中間赤外線天体」(ERMOs)を検出した。PAH高輝度銀河は中間赤外線で選択した銀河サンプルの約1%に過ぎないけれども、星形成の年齢の極めて若い大変重要な段階にある銀河と考えられる。一方ERMOsは中間赤外線で選択した銀河サンプルの約10-15%存在し、そのかなりの割合が、星形成銀河というよりもむしろ塵に埋もれた活動的銀河核をエネルギー源とするような天体であることがわかってきた。今後このような天体の正体をさらに詳しく調べていくことで、銀河進化の描像に新たな知見を加えることができるであろう。
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

2003年～ 2005年

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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。
銀河系の形成と進化の研究

千葉柾司, 土佐誠, 青木和光, 児玉忠恭

提供機関：Japan Society for the Promotion of Science

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

研究種目：Grant-in-Aid for Scientific Research (C)

研究機関：Tohoku University

2003年～ 2004年

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本研究課題では、銀河系や局部銀河群にある銀河の形成と進化を、観測データの解析と理論計算の両面から総合的に検討することを主題としている。この研究背景としては、詳細な観測データが比較的充実している我々の銀河系や局部銀河群のもうひとつの明るい銀河であるM31に代表される円盤銀河が、どのようにして形成され現在見られるような構造に至ったかを明らかにすることが、一般の円盤銀河の形成と進化を解明する上で重要な鍵を握っているからである。特に近年は、すばる望遠鏡に代表される大型望遠鏡やスローン・デジタル・スカイサーベイ(SDSS)などの専用望遠鏡などによって、銀河系やM31などの恒星系に関する高質で多量の観測情報が得られるので、これらの望遠鏡を用いた銀河系・局部銀河群の銀河研究を、組織化した研究体制で取り組んでいる。本研究では、特に銀河系の伴銀河であるマゼラン雲やM31に付随するG1と呼ばれる星団の力学進化計算を基にして、銀河系やM31における銀河形成過程の物理を引き出す試みを行なった。これらの計算から、伴銀河とそのホスト銀河との物理的関連が明らかとなり、銀河形成を考える上でその伴銀河の形成と進化が大変重要であることがわかった。また、銀河系において最も質量の重い球状星団である、オメガセンタウリの力学進化を計算し、この母銀河の性質に対して重要な制限が得られた。この研究から、球状星団の起源に関する新しい知見が得られた。さらに、銀河系などの一般銀河を取り巻くように暗黒物質が広く分布していることが知られているが、これがどのような大局的分布をしていてさらにどのような微細構造を持っているかが近年注目されている。さらに、暗黒物質の微細構造が銀河形成とどのような関係があるかも重要である。このような観点から、我々は重力レンズ現象に基づいて、レンズを起こす銀河の暗黒物質構造に対して新しい制限を与えることができた。
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

1999年～ 2001年

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担当経験のある科目(授業) 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
銀河物理学特論Ⅱ・銀河物理学特殊講義　東北大学理学研究科
科学の最前線　東北大学大学院理学研究科
自然界の構造　東北大学
Stellar populations in distant galaxies and galaxy clusters　University of Vienna, Austria
銀河・銀河団の形成と進化（集中講義）　名古屋大学大学院専門科目

︎全件表示 ︎最初の5件までを表示