研究者詳細

顔写真

トウマ ケンジ
當真 賢二
Kenji Toma
所属
高等研究機構学際科学フロンティア研究所 先端学際基幹研究部 先端基礎科学研究領域
職名
教授
学位
  • 博士(理学)(京都大学)

  • 修士(理学)(京都大学)

経歴 6

  • 2023年10月 ~ 継続中
    東北大学 学際科学フロンティア研究所 教授

  • 2018年4月 ~ 2023年9月
    東北大学 学際科学フロンティア研究所 准教授

  • 2013年12月 ~ 2018年3月
    東北大学 学際科学フロンティア研究所 助教

  • 2011年4月 ~ 2013年11月
    独立行政法人日本学術振興会 大阪大学 特別研究員SPD

  • 2008年10月 ~ 2011年3月
    Pennsylvania State University Department of Astronomy and Astrophysics Postdoctoral Fellow

  • 2008年4月 ~ 2008年9月
    国立天文台 理論研究部 研究員

︎全件表示 ︎最初の5件までを表示

学歴 1

  • 京都大学 大学院理学研究科

    2005年4月 ~ 2008年3月

委員歴 5

  • 東京大学宇宙線研究所 運営委員会委員

    2024年4月 ~ 2026年3月

  • 日本天文学会 第7期代議員

    2022年4月 ~ 2026年3月

  • 高エネルギー宇宙物理学連絡会 将来計画検討委員会第5期外部委員

    2022年1月 ~ 2024年12月

  • 理論天文学宇宙物理学懇談会 運営委員(2020)運営委員長(2021)

    2019年12月 ~ 2021年11月

  • 理論天文学宇宙物理学懇談会 運営委員

    2016年12月 ~ 2018年11月

所属学協会 3

  • 理論天文学宇宙物理学懇談会

  • 日本物理学会

  • 日本天文学会

研究キーワード 3

  • ガンマ線バースト

  • ブラックホール

  • 宇宙物理学

研究分野 1

  • 自然科学一般 / 天文学 /

受賞 5

  1. The 2020 Breakthrough Prize in Physics

    2019年11月

  2. 森田記念賞

    2019年10月 東北大学理学部物理系同窓会 泉萩会

  3. 平成29年度科学技術分野の文部科学大臣表彰若手科学者賞

    2017年4月 文部科学省 偏光によるブラックホールジェットの研究

  4. 第8回日本物理学会若手奨励賞

    2014年3月29日 日本物理学会 ガンマ線バーストの偏光と相対論的ジェットの研究

  5. 第25回日本天文学会研究奨励賞

    2014年3月20日 日本天文学会 ガンマ線バーストの偏光と相対論的ジェットの研究

論文 117

  1. Broadband multi-wavelength properties of M87 during the 2018 EHT campaign including a very high energy flaring episode 査読有り

    J. C. Algaba, M. Baloković, S. Chandra, W.-Y. Cheong, Y.-Z. Cui, F. D’Ammando, A. D. Falcone, N. M. Ford, M. Giroletti, C. Goddi, M. A. Gurwell, K. Hada, D. Haggard, S. Jorstad, A. Kaur, T. Kawashima, S. Kerby, J.-Y. Kim, M. Kino, E. V. Kravchenko, S.-S. Lee, R.-S. Lu, S. Markoff, J. Michail, J. Neilsen, M. A. Nowak, G. Principe, V. Ramakrishnan, B. Ripperda, M. Sasada, S. S. Savchenko, C. Sheridan, K. Akiyama, A. Alberdi, W. Alef, R. Anantua, K. Asada, R. Azulay, U. Bach, A.-K. Baczko, D. Ball, B. Bandyopadhyay, J. Barrett, M. Bauböck, B. A. Benson, D. Bintley, L. lackburn, R. Blundell, K. L. Bouman, G. C. Bower, H. Boyce, M. Bremer, R. Brissenden, S. Britzen, A. E. Broderick, D. Broguiere, T. Bronzwaer, S. Bustamante, J. E. Carlstrom, A. Chael, C.-k. Chan, D. O. Chang, K. Chatterjee, S. Chatterjee, M.-T. Chen, Y. Chen, X. Cheng, I. Cho, P. Christian, N. S. Conroy, J. E. Conway, T. M. Crawford, G. B. Crew, A. Cruz-Osorio, R. Dahale, J. Davelaar, M. De Laurentis, R. Deane, J. Dempsey, G. Desvignes, J. Dexter, V. Dhruv, I. K. Dihingia, S. S. Doeleman, S. A. Dzib, R. P. Eatough, R. Emami, H. Falcke, J. Farah, V. L. Fish, E. Fomalont, H. A. Ford, M. Foschi, R. Fraga-Encinas, W. T. Freeman, P. Friberg, C. M. Fromm, A. Fuentes, P. Galison, C. F. Gammie, R. García, O. Gentaz, B. Georgiev, R. Gold, A. I. Gómez-Ruiz, J. L. Gómez, M. Gu, R. Hesper, D. Heumann, L. C. Ho, P. Ho, M. Honma, C.-W. L. Huang, L. Huang, D. H. Hughes, S. Ikeda, C. M. V. Impellizzeri, M. Inoue, S. Issaoun, D. J. James, B. T. Jannuzi, M. Janssen, B. Jeter, W. Jiang, A. Jiménez-Rosales, M. D. Johnson, A. C. Jones, A. V. Joshi, T. Jung, R. Karuppusamy, G. K. Keating, M. Kettenis, D.-J. Kim, J. Kim, J. Kim, J. Y. Koay, P. Kocherlakota, Y. Kofuji, P. M. Koch, S. Koyama, C. Kramer, J. A. Kramer, M. Kramer, T. P. Krichbaum, C.-Y. Kuo, N. La Bella, A. Levis, Z. Li, R. Lico, G. Lindahl, M. Lindqvist, M. Lisakov, J. Liu, K. Liu, E. Liuzzo, W.-P. Lo, A. P. Lobanov, L. Loinard, C. J. Lonsdale, A. E. Lowitz, N. R. MacDonald, J. Mao, N. Marchili, D. P. Marrone, A. P. Marscher, I. Martí-Vidal, S. Matsushita, L. D. Matthews, L. Medeiros, K. M. Menten, I. Mizuno, Y. Mizuno, J. Montgomery, J. M. Moran, K. Moriyama, M. Moscibrodzka, W. Mulaudzi, C. Müller, H. Müller, A. Mus, G. Musoke, I. Myserlis, H. Nagai, N. M. Nagar, D. G. Nair, M. Nakamura, G. Narayanan, I. Natarajan, A. Nathanail, S. Navarro Fuentes, C. Ni, J. Oh, H. Okino, H. Olivares, T. Oyama, F. Özel, D. C. M. Palumbo, G. Filippos Paraschos, J. Park, H. Parsons, N. Patel, U.-L. Pen, D. W. Pesce, V. Piétu, A. PopStefanija, O. Porth, B. Prather, D. Psaltis, H.-Y. Pu, R. Rao, M. G. Rawlings, A. W. Raymond, L. Rezzolla, A. Ricarte, F. Roelofs, C. Romero-Cañizales, E. Ros, A. Roshanineshat, H. Rottmann, A. L. Roy, I. Ruiz, C. Ruszczyk, K. L. J. Rygl, S. Sánchez, D. Sánchez-Argüelles, M. Sánchez-Portal, K. Satapathy, T. Savolainen, F. P. Schloerb, J. Schonfeld, K.-F. Schuster, L. Shao, Z. Shen, D. Small, B. W. Sohn, J. SooHoo, L. D. Sosapanta Salas, K. Souccar, J. S. Stanway, H. Sun, F. Tazaki, A. J. Tetarenko, P. Tiede, R. P. J. Tilanus, M. Titus, K. Toma, P. Torne, T. Toscano, E. Traianou, T. Trent, S. Trippe, M. Turk, I. van Bemmel, H. J. van Langevelde, D. R. van Rossum, J. Vos, J. Wagner, D. Ward-Thompson, J. Wardle, J. E. Washington, J. Weintroub, R. Wharton, M. Wielgus, K. Wiik, G. Witzel, M. F. Wondrak, G. N. Wong, Q. Wu, N. Yadlapalli, P. Yamaguchi, A. Yfantis, D. Yoon, A. Young, Z. Younsi, W. Yu, F. Yuan, Y.-F. Yuan, J. A. Zensus, S. Zhang, G.-Y. Zhao, S.-S. Zhao, R. Bellazzini, B. Berenji, E. Bissaldi, R. D. Blandford, R. Bonino, P. Bruel, R. A. Cameron, P. A. Caraveo, E. Cavazzuti, C. C. Cheung, S. Ciprini, P. Cristarella Orestano, S. Cutini, N. Di Lalla, A. Dinesh, L. Di Venere, A. Domínguez, S. J. Fegan, A. Franckowiak, Y. Fukazawa, P. Fusco, F. Gargano, C. Gasbarra, S. Germani, M. Giliberti, I. A. Grenier, E. Hays, D. Horan, M. Kuss, S. Larsson, I. Liodakis, F. Longo, F. Loparco, M. N. Lovellette, S. Maldera, M. N. Mazziotta, I. Mereu, P. F. Michelson, N. Mirabal, T. Mizuno, M. E. Monzani, A. Morselli, M. Negro, N. Omodei, E. Orlando, M. Persic, S. Rainò, B. Rani, A. Reimer, O. Reimer, M. Sánchez-Conde, P. M. Saz Parkinson, C. Sgrò, E. J. Siskind, P. Spinelli, D. J. Suson, H. Tajima, D. F. Torres, G. Zaharijas, F. Aharonian, F. Ait Benkhali, J. Aschersleben, H. Ashkar, M. Backes, V. Barbosa Martins, R. Batzofin, Y. Becherini, D. Berge, M. Böttcher, C. Boisson, J. Bolmont, M. de Bony de Lavergne, J. Borowska, M. Bouyahiaoui, F. Bradascio, R. Brose, A. Brown, B. Bruno, T. Bulik, C. Burger-Scheidlin, S. Casanova, R. Cecil, J. Celic, M. Cerruti, T. Chand, A. Chen, J. Chibueze, O. Chibueze, G. Cotter, J. Damascene Mbarubucyeye, J. Devin, J. Djuvsland, A. Dmytriiev, S. Einecke, J.-P. Ernenwein, K. Feijen, G. Fontaine, S. Funk, S. Gabici, D. Glawion, J. F. Glicenstein, P. Goswami, G. Grolleron, L. Haerer, B. Heß, T. L. Holch, M. Holler, D. Horns, Zhiqiu Huang, M. Jamrozy, F. Jankowsky, I. Jung-Richardt, E. Kasai, K. Katarzyński, R. Khatoon, B. Khélifi, W. Kluźniak, Nu. Komin, K. Kosack, A. Kundu, R. G. Lang, S. Le Stum, F. Leitl, A. Lemière, M. Lemoine-Goumard, J.-P. Lenain, F. Leuschner, A. Luashvili, J. Mackey, D. Malyshev, G. Martí-Devesa, R. Marx, M. Meyer, A. Mitchell, R. Moderski, M. O. Moghadam, L. Mohrmann, A. Montanari, E. Moulin, M. de Naurois, J. Niemiec, P. O’Brien, S. Ohm, E. de Ona Wilhelmi, M. Ostrowski, S. Panny, M. Panter, U. Pensec, S. Pita, G. Pühlhofer, A. Quirrenbach, S. Ravikularaman, A. Reimer, O. Reimer, B. Reville, I. Reis, H. Ren, F. Rieger, G. Roellinghoff, B. Rudak, E. Ruiz-Velasco, K. Sabri, V. Sahakian, H. Salzmann, A. Santangelo, M. Sasaki, J. Schäfer, F. Schüssler, H. M. Schutte, J. N. S. Shapopi, A. Sharma, H. Sol, S. Spencer, Ł. Stawarz, C. Steppa, K. Streil, H. Suzuki, T. Takahashi, T. Tanaka, A. M. Taylor, R. Terrier, M. Tluczykont, M. Tsirou, C. van Eldik, M. Vecchi, T. Wach, S. J. Wagner, A. Wierzcholska, M. Zacharias, A. A. Zdziarski, A. Zech, N. Żywucka, S. Abe, J. Abhir, A. Abhishek, V. A. Acciari, A. Aguasca-Cabot, I. Agudo, T. Aniello, S. Ansoldi, L. A. Antonelli, A. Arbet Engels, C. Arcaro, M. Artero, K. Asano, A. Babić, U. Barres de Almeida, J. A. Barrio, I. Batković, A. Bautista, J. Baxter, J. Becerra González, W. Bednarek, E. Bernardini, J. Bernete, A. Berti, J. Besenrieder, C. Bigongiari, A. Biland, O. Blanch, G. Bonnoli, Ž. Bošnjak, E. Bronzini, I. Burelli, G. Busetto, A. Campoy-Ordaz, A. Carosi, R. Carosi, M. Carretero-Castrillo, A. J. Castro-Tirado, D. Cerasole, G. Ceribella, Y. Chai, A. Cifuentes, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, G. D’Amico, V. D’Elia, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, R. de Menezes, M. Delfino, J. Delgado, C. Delgado Mendez, F. Di Pierro, R. Di Tria, L. Di Venere, D. Dominis Prester, A. Donini, D. Dorner, M. Doro, D. Elsaesser, J. Escudero, L. Fariña, A. Fattorini, L. Foffano, L. Font, S. Fröse, S. Fukami, Y. Fukazawa, R. J. García López, M. Garczarczyk, S. Gasparyan, M. Gaug, J. G. Giesbrecht Paiva, N. Giglietto, F. Giordano, P. Gliwny, N. Godinović, T. Gradetzke, R. Grau, D. Green, J. G. Green, P. Günther, D. Hadasch, A. Hahn, T. Hassan, L. Heckmann, J. Herrera Llorente, D. Hrupec, R. Imazawa, K. Ishio, I. Jiménez Martínez, J. Jormanainen, T. Kayanoki, D. Kerszberg, G. W. Kluge, Y. Kobayashi, P. M. Kouch, H. Kubo, J. Kushida, M. Láinez, A. Lamastra, F. Leone, E. Lindfors, S. Lombardi, R. López-Coto, M. López-Moya, A. López-Oramas, S. Loporchio, A. Lorini, E. Lyard, B. Machado de Oliveira Fraga, P. Majumdar, M. Makariev, G. Maneva, M. Manganaro, S. Mangano, K. Mannheim, M. Mariotti, M. Martínez, M. Martínez-Chicharro, A. Mas-Aguilar, D. Mazin, S. Menchiari, S. Mender, D. Miceli, T. Miener, J. M. Miranda, R. Mirzoyan, M. Molero González, E. Molina, H. A. Mondal, A. Moralejo, D. Morcuende, T. Nakamori, C. Nanci, V. Neustroev, L. Nickel, M. Nievas Rosillo, C. Nigro, L. Nikolić, K. Nilsson, K. Nishijima, T. Njoh Ekoume, K. Noda, S. Nozaki, Y. Ohtani, A. Okumura, J. Otero-Santos, S. Paiano, D. Paneque, R. Paoletti, J. M. Paredes, M. Peresano, M. Persic, M. Pihet, G. Pirola, F. Podobnik, P. G. Prada Moroni, E. Prandini, C. Priyadarshi, M. Ribó, J. Rico, C. Righi, N. Sahakyan, T. Saito, F. G. Saturni, K. Schmidt, F. Schmuckermaier, J. L. Schubert, T. Schweizer, A. Sciaccaluga, G. Silvestri, J. Sitarek, V. Sliusar, D. Sobczynska, A. Spolon, A. Stamerra, J. Strišković, D. Strom, M. Strzys, Y. Suda, S. Suutarinen, H. Tajima, M. Takahashi, R. Takeishi, F. Tavecchio, P. Temnikov, K. Terauchi, T. Terzić, M. Teshima, S. Truzzi, A. Tutone, S. Ubach, J. van Scherpenberg, M. Vazquez Acosta, S. Ventura, G. Verna, I. Viale, C. F. Vigorito, V. Vitale, I. Vovk, R. Walter, M. Will, C. Wunderlich, T. Yamamoto, A. Acharyya, C. B. Adams, P. Bangale, J. T. Bartkoske, W. Benbow, J. L. Christiansen, A. Duerr, M. Errando, Q. Feng, J. Foote, L. Fortson, A. Furniss, W. Hanlon, O. Hervet, C. E. Hinrichs, J. Holder, T. B. Humensky, W. Jin, M. N. Johnson, P. Kaaret, M. Kertzman, D. Kieda, T. K. Kleiner, N. Korzoun, F. Krennrich, S. Kumar, M. J. Lang, M. Lundy, G. Maier, C. E. McGrath, M. J. Millard, C. L. Mooney, P. Moriarty, R. Mukherjee, W. Ning, S. O’Brien, R. A. Ong, M. Pohl, E. Pueschel, J. Quinn, K. Ragan, P. T. Reynolds, D. Ribeiro, E. Roache, J. L. Ryan, I. Sadeh, L. Saha, M. Santander, G. H. Sembroski, R. Shang, M. Splettstoesser, A. K. Talluri, J. V. Tucci, J. Valverde, V. V. Vassiliev, D. A. Williams, S. L. Wong, Z. Chen, L. Cui, T. Hirota, B. Li, G. Li, Q. Liu, X. Liu, Z. Liu, J. Ma, K. Niinuma, H. Ro, N. Sakai, S. Sawada-Satoh, K. Wajima, J. Wang, N. Wang, B. Xia, H. Yan, Y. Yonekura, H. Zhang, R. Zhao, W. Zhong

    Astronomy & Astrophysics 692 A140-A140 2024年12月13日

    出版者・発行元: EDP Sciences

    DOI: 10.1051/0004-6361/202450497  

    ISSN:0004-6361

    eISSN:1432-0746

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    Context. The nearby elliptical galaxy M87 contains one of only two supermassive black holes whose emission surrounding the event horizon has been imaged by the Event Horizon Telescope (EHT). In 2018, more than two dozen multi-wavelength (MWL) facilities (from radio to γ-ray energies) took part in the second M87 EHT campaign. Aims. The goal of this extensive MWL campaign was to better understand the physics of the accreting black hole M87*, the relationship between the inflow and inner jets, and the high-energy particle acceleration. Understanding the complex astrophysics is also a necessary first step towards performing further tests of general relativity. Methods. The MWL campaign took place in April 2018, overlapping with the EHT M87* observations. We present a new, contemporaneous spectral energy distribution (SED) ranging from radio to very high-energy (VHE) γ-rays as well as details of the individual observations and light curves. We also conducted phenomenological modelling to investigate the basic source properties. Results. We present the first VHE γ-ray flare from M87 detected since 2010. The flux above 350 GeV more than doubled within a period of ≈36 hours. We find that the X-ray flux is enhanced by about a factor of two compared to 2017, while the radio and millimetre core fluxes are consistent between 2017 and 2018. We detect evidence for a monotonically increasing jet position angle that corresponds to variations in the bright spot of the EHT image. Conclusions. Our results show the value of continued MWL monitoring together with precision imaging for addressing the origins of high-energy particle acceleration. While we cannot currently pinpoint the precise location where such acceleration takes place, the new VHE γ-ray flare already presents a challenge to simple one-zone leptonic emission model approaches, and it emphasises the need for combined image and spectral modelling.

  2. Large-scale Magnetic Field Model of GRB Afterglow Polarization: Effects of Field Anisotropy, Off-axis Viewing Angle, and Ordered Field 査読有り

    Asuka Kuwata, Kenji Toma, Sara Tomita, Jiro Shimoda

    The Astrophysical Journal 977 (2) 224-238 2024年12月1日

    出版者・発行元: American Astronomical Society

    DOI: 10.3847/1538-4357/ad900b  

    ISSN:0004-637X

    eISSN:1538-4357

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    Abstract The afterglows of gamma-ray bursts are nonthermal electron synchrotron emissions from relativistic shocks. The origin of strong magnetic field in the emission region remains elusive, and two field amplification mechanisms via the plasma kinetic and magnetohydrodynamic instabilities have been discussed. The polarimetric observations are a powerful probe to distinguish these two mechanisms. So far, most theoretical works have focused on the former mechanism and constructed afterglow polarization models with microscopic-scale turbulence whose coherence length is much smaller than the thickness of the blast wave. In this work, focusing on the latter mechanism, we utilize our semianalytic model of the synchrotron polarization with large-scale turbulence whose coherence length is comparable to the thickness of the blast wave to investigate the effect of magnetic field anisotropy and the observer viewing angle. We find that the polarization in our large-scale turbulence model can exhibit both behaviors characteristic of the microscopic-scale turbulence model and those not seen in the microscopic-scale model. Then we find that the large-scale model could explain all the polarimetric observational data to date that seem to be forward shock emission. We also examine the effect of ordered-field components and find that polarization degree and polarization angle constant in time are realized only when the energy density ratio of the ordered and fluctuated components is ≳50. In this case, however, the polarization degree is much higher than the observed values.

  3. Multiwavelength Emission from Jets and Magnetically Arrested Disks in Nearby Radio Galaxies: Application to M87 査読有り

    Riku Kuze, Shigeo S. Kimura, Kenji Toma

    The Astrophysical Journal 977 (1) 22-36 2024年11月29日

    出版者・発行元: American Astronomical Society

    DOI: 10.3847/1538-4357/ad88f4  

    ISSN:0004-637X

    eISSN:1538-4357

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    Abstract Radio galaxies are a subclass of active galactic nuclei that drive relativistic jets from their center and are observed in radio to very-high-energy gamma rays. The emission mechanisms and regions are still unknown. High-energy gamma rays can be explained by the emission from the magnetically arrested disks (MADs) around the central supermassive black hole (BH), for which the magnetic flux threading the BH is in a saturation level, although the emission from the MADs does not explain the optical and X-ray data. We construct a two-zone multiwavelength emission model in which optical and X-rays come from jets, while millimeter/submillimeter and gamma rays come from MADs. Our model takes into account the particle injection by the magnetic reconnection at the jet base close to the BH and particle entrainment from the ambient gas at the jet emission zone. We apply our model to M87 and find that our model can explain the simultaneous multiwavelength data, except for the radio data, which could be explained if we extend our one-zone emission model to a one-dimensional one. We also find that the strong plasma entrainment is necessary to explain the multiwavelength data. Our model will be tested by variability analysis among the multiwavelength data.

  4. Varying linear polarisation in the dust-free gamma-ray burst 210610B 査読有り

    J. F. Agüí Fernández, A. de Ugarte Postigo, C. C. Thöne, S. Kobayashi, A. Rossi, K. Toma, M. Jelínek, D. A. Kann, S. Covino, K. Wiersema, D. Hartmann, P. Jakobsson, A. Martin-Carrillo, A. Melandri, M. De Pasquale, G. Pugliese, S. Savaglio, R. L. C. Starling, J. Štrobl, M. Della Valle, S. de Wet, T. Zafar

    Astronomy & Astrophysics 690 A216-A232 2024年10月10日

    出版者・発行元: EDP Sciences

    DOI: 10.1051/0004-6361/202348572  

    ISSN:0004-6361

    eISSN:1432-0746

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    Context. Long gamma-ray bursts (GRBs) are produced by the collapse of some very massive stars, that emit ultra-relativistic jets. When the jets collide with the interstellar medium they decelerate and generate the so-called afterglow emission, which has been observed to be polarised. Aims. We study the polarimetric evolution of the GRB 210610B afterglow, at z = 1.1341. This allows us to evaluate the role of geometric and/or magnetic mechanisms in the GRB afterglow polarisation. Methods. We observed GRB 210610B using imaging polarimetry with CAFOS on the 2.2 m Calar Alto Telescope and FORS2 on the 4 × 8.1 m Very Large Telescope. Complementary optical spectroscopy was obtained with OSIRIS on the 10.4 m Gran Telescopio Canarias. We studied the GRB light-curve from X-rays to the optical bands and the Spectral Energy Distribution (SED). This allowed us to strongly constrain the line-of-sight extinction. Finally, we studied the GRB host galaxy using optical to NIR data to fit the SED and derive its integrated properties. Results. GRB 210610B had a bright afterglow with a negligible line-of-sight extinction. Polarimetry was obtained at three epochs: during an early plateau phase, at the time when the light curve breaks, and after the light curve steepened. We observe an initial polarisation of ∼4% that goes to zero at the time of the break, and it then again increases to ∼2%, with a change in the position angle of 54 ± 9 deg. The spectrum shows features with very low equivalent widths. This indicate a small amount of material in the line of sight within the host. Conclusions. The lack of dust and the low amount of material in the line of sight to GRB 210610B allowed us to study the intrinsic polarisation of the GRB optical afterglow. The GRB polarisation signals are consistent with ordered magnetic fields in refreshed shock or/and hydrodynamics-scale turbulent fields in the forward shock.

  5. Discovery of Limb Brightening in the Parsec-scale Jet of NGC 315 through Global Very Long Baseline Interferometry Observations and Its Implications for Jet Models 査読有り

    Jongho Park, Guang-Yao Zhao, Masanori Nakamura, Yosuke Mizuno, Hung-Yi Pu, Keiichi Asada, Kazuya Takahashi, Kenji Toma, Motoki Kino, Ilje Cho, Kazuhiro Hada, Phil G. Edwards, Hyunwook Ro, Minchul Kam, Kunwoo Yi, Yunjeong Lee, Shoko Koyama, Do-Young Byun, Chris Phillips, Cormac Reynolds, Jeffrey A. Hodgson, Sang-Sung Lee

    The Astrophysical Journal Letters 973 (2) L45-L45 2024年9月24日

    出版者・発行元: American Astronomical Society

    DOI: 10.3847/2041-8213/ad7137  

    ISSN:2041-8205

    eISSN:2041-8213

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    Abstract We report the first observation of the nearby giant radio galaxy NGC 315 using a global very long baseline interferometry (VLBI) array consisting of 22 radio antennas located across five continents, including high-sensitivity stations, at 22 GHz. Utilizing the extensive u v-coverage provided by the array, coupled with the application of a recently developed superresolution imaging technique based on the regularized maximum-likelihood method, we were able to transversely resolve the NGC 315 jet at parsec scales for the first time. Previously known for its central ridge-brightened morphology at similar scales in former VLBI studies, the jet now clearly exhibits a limb-brightened structure. This finding suggests an inherent limb brightening that was not observable before due to limited angular resolution. Considering that the jet is viewed at an angle of ∼50°, the observed limb brightening is challenging to reconcile with the magnetohydrodynamic models and simulations, which predict that the Doppler-boosted jet edges should dominate over the nonboosted central layer. The conventional jet model that proposes a fast spine and a slow sheath with uniform transverse emissivity may pertain to our observations. However, in this model, the relativistic spine would need to travel at speeds of Γ ≳ 6.0–12.9 along the deprojected jet distance of (2.3–10.8) × 103 gravitational radii from the black hole. We propose an alternative scenario that suggests higher emissivity at the jet boundary layer, resulting from more efficient particle acceleration or mass loading onto the jet edges, and consider prospects for future observations with even higher angular resolution.

  6. First Very Long Baseline Interferometry Detections at 870 μm

    Alexander W. Raymond, Sheperd S. Doeleman, Keiichi Asada, Lindy Blackburn, Geoffrey C. Bower, Michael Bremer, Dominique Broguiere, Ming-Tang Chen, Geoffrey B. Crew, Sven Dornbusch, Vincent L. Fish, Roberto García, Olivier Gentaz, Ciriaco Goddi, Chih-Chiang Han, Michael H. Hecht, Yau-De Huang, Michael Janssen, Garrett K. Keating, Jun Yi Koay, Thomas P. Krichbaum, Wen-Ping Lo, Satoki Matsushita, Lynn D. Matthews, James M. Moran, Timothy J. Norton, Nimesh Patel, Dominic W. Pesce, Venkatessh Ramakrishnan, Helge Rottmann, Alan L. Roy, Salvador Sánchez, Remo P. J. Tilanus, Michael Titus, Pablo Torne, Jan Wagner, Jonathan Weintroub, Maciek Wielgus, André Young, Kazunori Akiyama, Ezequiel Albentosa-Ruíz, Antxon Alberdi, Walter Alef, Juan Carlos Algaba, Richard Anantua, Rebecca Azulay, Uwe Bach, Anne-Kathrin Baczko, David Ball, Mislav Balokovic, Bidisha Bandyopadhyay, John Barrett, Michi Bauböck, Bradford A. Benson, Dan Bintley, Raymond Blundell, Katherine L. Bouman, Hope Boyce, Roger Brissenden, Silke Britzen, Avery E. Broderick, Thomas Bronzwaer, Sandra Bustamante, John E. Carlstrom, Andrew Chael, Chi-kwan Chan, Dominic O. Chang, Koushik Chatterjee, Shami Chatterjee, Yongjun 永军 Chen 陈, Xiaopeng Cheng, Ilje Cho, Pierre Christian, Nicholas S. Conroy, John E. Conway, Thomas M. Crawford, Alejandro Cruz-Osorio, Yuzhu 玉竹 Cui 崔, Rohan Dahale, Jordy Davelaar, Mariafelicia De Laurentis, Roger Deane, Jessica Dempsey, Gregory Desvignes, Jason Dexter, Vedant Dhruv, Indu K. Dihingia, Sergio A. Dzib, Ralph P. Eatough, Razieh Emami, Heino Falcke, Joseph Farah, Edward Fomalont, Anne-Laure Fontana, H. Alyson Ford, Marianna Foschi, Raquel Fraga-Encinas, William T. Freeman, Per Friberg, Christian M. Fromm, Antonio Fuentes, Peter Galison, Charles F. Gammie, Boris Georgiev, Roman Gold, Arturo I. Gómez-Ruiz, José L. Gómez, Minfeng 敏峰 Gu 顾, Mark Gurwell, Kazuhiro Hada, Daryl Haggard, Ronald Hesper, Dirk Heumann, Luis C. 子山 Ho 何, Paul Ho, Mareki Honma, Chih-Wei L. Huang, Lei 磊 Huang 黄, David H. Hughes, Shiro Ikeda, C. M. Violette Impellizzeri, Makoto Inoue, Sara Issaoun, David J. James, Buell T. Jannuzi, Britton Jeter, Wu 悟 Jiang 江, Alejandra Jiménez-Rosales, Michael D. Johnson, Svetlana Jorstad, Adam C. Jones, Abhishek V. Joshi, Taehyun Jung, Ramesh Karuppusamy, Tomohisa Kawashima, Mark Kettenis, Dong-Jin Kim, Jae-Young Kim, Jongsoo Kim, Junhan Kim, Motoki Kino, Prashant Kocherlakota, Yutaro Kofuji, Patrick M. Koch, Shoko Koyama, Carsten Kramer, Joana A. Kramer, Michael Kramer, Derek Kubo, Cheng-Yu Kuo, Noemi La Bella, Sang-Sung Lee, Aviad Levis, Zhiyuan 志远 Li 李, Rocco Lico, Greg Lindahl, Michael Lindqvist, Mikhail Lisakov, Jun 俊 Liu 刘, Kuo Liu, Elisabetta Liuzzo, Andrei P. Lobanov, Laurent Loinard, Colin J. Lonsdale, Amy E. Lowitz, Ru-Sen 如森 Lu 路, Nicholas R. MacDonald, Sylvain Mahieu, Doris Maier, Jirong 基荣 Mao 毛, Nicola Marchili, Sera Markoff, Daniel P. Marrone, Alan P. Marscher, Iván Martí-Vidal, Lia Medeiros, Karl M. Menten, Izumi Mizuno, Yosuke Mizuno, Joshua Montgomery, Kotaro Moriyama, Monika Moscibrodzka, Wanga Mulaudzi, Cornelia Müller, Hendrik Müller, Alejandro Mus, Gibwa Musoke, Ioannis Myserlis, Hiroshi Nagai, Neil M. Nagar, Masanori Nakamura, Gopal Narayanan, Iniyan Natarajan, Antonios Nathanail, Santiago Navarro Fuentes, Joey Neilsen, Chunchong Ni, Michael A. Nowak, Junghwan Oh, Hiroki Okino, Héctor Raúl Olivares Sánchez, Tomoaki Oyama, Feryal Özel, Daniel C. M. Palumbo, Georgios Filippos Paraschos, Jongho Park, Harriet Parsons, Ue-Li Pen, Vincent Piétu, Aleksandar PopStefanija, Oliver Porth, Ben Prather, Giacomo Principe, Dimitrios Psaltis, Hung-Yi Pu, Philippe A. Raffin, Ramprasad Rao, Mark G. Rawlings, Angelo Ricarte, Bart Ripperda, Freek Roelofs, Cristina Romero-Cañizales, Eduardo Ros, Arash Roshanineshat, Ignacio Ruiz, Chet Ruszczyk, Kazi L. J. Rygl, David Sánchez-Argüelles, Miguel Sánchez-Portal, Mahito Sasada, Kaushik Satapathy, Tuomas Savolainen, F. Peter Schloerb, Jonathan Schonfeld, Karl-Friedrich Schuster, Lijing Shao, Zhiqiang 志强 Shen 沈, Des Small, Bong Won Sohn, Jason SooHoo, León David Sosapanta Salas, Kamal Souccar, Ranjani Srinivasan, Joshua S. Stanway, He 赫 Sun 孙, Fumie Tazaki, Alexandra J. Tetarenko, Paul Tiede, Kenji Toma, Teresa Toscano, Efthalia Traianou, Tyler Trent, Sascha Trippe, Matthew Turk, Ilse van Bemmel, Huib Jan van Langevelde, Daniel R. van Rossum, Jesse Vos, Derek Ward-Thompson, John Wardle, Jasmin E. Washington, Robert Wharton, Kaj Wiik, Gunther Witzel, Michael F. Wondrak, George N. Wong, Qingwen 庆文 Wu 吴, Nitika Yadlapalli, Paul Yamaguchi, Aristomenis Yfantis, Doosoo Yoon, Ziri Younsi, Wei 威 Yu 于, Feng 峰 Yuan 袁, Ye-Fei 业飞 Yuan 袁, J. Anton Zensus, Shuo Zhang, Guang-Yao Zhao, Shan-Shan 杉杉 Zhao 赵

    The Astronomical Journal 168 (3) 130-130 2024年8月27日

    出版者・発行元: American Astronomical Society

    DOI: 10.3847/1538-3881/ad5bdb  

    ISSN:0004-6256

    eISSN:1538-3881

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    Abstract The first very long baseline interferometry (VLBI) detections at 870 μm wavelength (345 GHz frequency) are reported, achieving the highest diffraction-limited angular resolution yet obtained from the surface of the Earth and the highest-frequency example of the VLBI technique to date. These include strong detections for multiple sources observed on intercontinental baselines between telescopes in Chile, Hawaii, and Spain, obtained during observations in 2018 October. The longest-baseline detections approach 11 Gλ, corresponding to an angular resolution, or fringe spacing, of 19 μas. The Allan deviation of the visibility phase at 870 μm is comparable to that at 1.3 mm on the relevant integration timescales between 2 and 100 s. The detections confirm that the sensitivity and signal chain stability of stations in the Event Horizon Telescope (EHT) array are suitable for VLBI observations at 870 μm. Operation at this short wavelength, combined with anticipated enhancements of the EHT, will lead to a unique high angular resolution instrument for black hole studies, capable of resolving the event horizons of supermassive black holes in both space and time.

  7. One-dimensional General Relativistic Particle-in-cell Simulations of Stellar-mass Black Hole Magnetospheres: A Semianalytic Model of Gamma-Rays from Gaps 査読有り

    Koki Kin, Shota Kisaka, Kenji Toma, Shigeo S. Kimura, Amir Levinson

    The Astrophysical Journal 2024年3月1日

    DOI: 10.3847/1538-4357/ad20cd  

  8. The persistent shadow of the supermassive black hole of M 87 査読有り

    Kazunori Akiyama, Antxon Alberdi, Walter Alef, Juan Carlos Algaba, Richard Anantua, Keiichi Asada, Rebecca Azulay, Uwe Bach, Anne-Kathrin Baczko, David Ball, Mislav Baloković, Bidisha Bandyopadhyay, John Barrett, Michi Bauböck, Bradford A. Benson, Dan Bintley, Lindy Blackburn, Raymond Blundell, Katherine L. Bouman, Geoffrey C. Bower, Hope Boyce, Michael Bremer, Roger Brissenden, Silke Britzen, Avery E. Broderick, Dominique Broguiere, Thomas Bronzwaer, Sandra Bustamante, John E. Carlstrom, Andrew Chael, Chi-kwan Chan, Dominic O. Chang, Koushik Chatterjee, Shami Chatterjee, Ming-Tang Chen, Yongjun Chen, Xiaopeng Cheng, Ilje Cho, Pierre Christian, Nicholas S. Conroy, John E. Conway, Thomas M. Crawford, Geoffrey B. Crew, Alejandro Cruz-Osorio, Yuzhu Cui, Rohan Dahale, Jordy Davelaar, Mariafelicia De Laurentis, Roger Deane, Jessica Dempsey, Gregory Desvignes, Jason Dexter, Vedant Dhruv, Indu K. Dihingia, Sheperd S. Doeleman, Sergio A. Dzib, Ralph P. Eatough, Razieh Emami, Heino Falcke, Joseph Farah, Vincent L. Fish, Edward Fomalont, H. Alyson Ford, Marianna Foschi, Raquel Fraga-Encinas, William T. Freeman, Per Friberg, Christian M. Fromm, Antonio Fuentes, Peter Galison, Charles F. Gammie, Roberto García, Olivier Gentaz, Boris Georgiev, Ciriaco Goddi, Roman Gold, Arturo I. Gómez-Ruiz, José L. Gómez, Minfeng Gu, Mark Gurwell, Kazuhiro Hada, Daryl Haggard, Ronald Hesper, Dirk Heumann, Luis C. Ho, Paul Ho, Mareki Honma, Chih-Wei L. Huang, Lei Huang, David H. Hughes, Shiro Ikeda, C. M. Violette Impellizzeri, Makoto Inoue, Sara Issaoun, David J. James, Buell T. Jannuzi, Michael Janssen, Britton Jeter, Wu Jiang, Alejandra Jiménez-Rosales, Michael D. Johnson, Svetlana Jorstad, Adam C. Jones, Abhishek V. Joshi, Taehyun Jung, Ramesh Karuppusamy, Tomohisa Kawashima, Garrett K. Keating, Mark Kettenis, Dong-Jin Kim, Jae-Young Kim, Jongsoo Kim, Junhan Kim, Motoki Kino, Jun Yi Koay, Prashant Kocherlakota, Yutaro Kofuji, Patrick M. Koch, Shoko Koyama, Carsten Kramer, Joana A. Kramer, Michael Kramer, Thomas P. Krichbaum, Cheng-Yu Kuo, Noemi La Bella, Sang-Sung Lee, Aviad Levis, Zhiyuan Li, Rocco Lico, Greg Lindahl, Michael Lindqvist, Mikhail Lisakov, Jun Liu, Kuo Liu, Elisabetta Liuzzo, Wen-Ping Lo, Andrei P. Lobanov, Laurent Loinard, Colin J. Lonsdale, Amy E. Lowitz, Ru-Sen Lu, Nicholas R. MacDonald, Jirong Mao, Nicola Marchili, Sera Markoff, Daniel P. Marrone, Alan P. Marscher, Iván Martí-Vidal, Satoki Matsushita, Lynn D. Matthews, Lia Medeiros, Karl M. Menten, Izumi Mizuno, Yosuke Mizuno, Joshua Montgomery, James M. Moran, Kotaro Moriyama, Monika Moscibrodzka, Wanga Mulaudzi, Cornelia Müller, Hendrik Müller, Alejandro Mus, Gibwa Musoke, Ioannis Myserlis, Hiroshi Nagai, Neil M. Nagar, Masanori Nakamura, Gopal Narayanan, Iniyan Natarajan, Antonios Nathanail, Santiago Navarro Fuentes, Joey Neilsen, Chunchong Ni, Michael A. Nowak, Junghwan Oh, Hiroki Okino, Héctor Olivares, Tomoaki Oyama, Feryal Özel, Daniel C. M. Palumbo, Georgios Filippos Paraschos, Jongho Park, Harriet Parsons, Nimesh Patel, Ue-Li Pen, Dominic W. Pesce, Vincent Piétu, Aleksandar PopStefanija, Oliver Porth, Ben Prather, Dimitrios Psaltis, Hung-Yi Pu, Venkatessh Ramakrishnan, Ramprasad Rao, Mark G. Rawlings, Alexander W. Raymond, Luciano Rezzolla, Angelo Ricarte, Bart Ripperda, Freek Roelofs, Cristina Romero-Cañizales, Eduardo Ros, Arash Roshanineshat, Helge Rottmann, Alan L. Roy, Ignacio Ruiz, Chet Ruszczyk, Kazi L. J. Rygl, Salvador Sánchez, David Sánchez-Argüelles, Miguel Sánchez-Portal, Mahito Sasada, Kaushik Satapathy, Tuomas Savolainen, F. Peter Schloerb, Jonathan Schonfeld, Karl-Friedrich Schuster, Lijing Shao, Zhiqiang Shen, Des Small, Bong Won Sohn, Jason SooHoo, León David Sosapanta Salas, Kamal Souccar, Joshua S. Stanway, He Sun, Fumie Tazaki, Alexandra J. Tetarenko, Paul Tiede, Remo P. J. Tilanus, Michael Titus, Kenji Toma, Pablo Torne, Teresa Toscano, Efthalia Traianou, Tyler Trent, Sascha Trippe, Matthew Turk, Ilse van Bemmel, Huib Jan van Langevelde, Daniel R. van Rossum, Jesse Vos, Jan Wagner, Derek Ward-Thompson, John Wardle, Jasmin E. Washington, Jonathan Weintroub, Robert Wharton, Maciek Wielgus, Kaj Wiik, Gunther Witzel, Michael F. Wondrak, George N. Wong, Qingwen Wu, Nitika Yadlapalli, Paul Yamaguchi, Aristomenis Yfantis, Doosoo Yoon, André Young, Ziri Younsi, Wei Yu, Feng Yuan, Ye-Fei Yuan, J. Anton Zensus, Shuo Zhang, Guang-Yao Zhao, Shan-Shan Zhao, Alexander Allardi, Shu-Hao Chang, Chih-Cheng Chang, Song-Chu Chang, Chung-Chen Chen, Ryan Chilson, Aaron Faber, David M. Gale, Chih-Chiang Han, Kuo-Chang Han, Yutaka Hasegawa, José Luis Hernández-Rebollar, Yau-De Huang, Homin Jiang, Hao Jinchi, Kimihiro Kimura, Derek Kubo, Chao-Te Li, Lupin C.-C. Lin, Ching-Tang Liu, Kuan-Yu Liu, Li-Ming Lu, Pierre Martin-Cocher, Zheng Meyer-Zhao, Alfredo Montaña, Anthony Moraghan, Marcos Emir Moreno-Nolasco, Hiroaki Nishioka, Timothy J. Norton, George Nystrom, Hideo Ogawa, Peter Oshiro, Nicolas Pradel, Giacomo Principe, Philippe Raffin, Iván Rodríguez-Montoya, Paul Shaw, William Snow, Tirupati Kumara Sridharan, Ranjani Srinivasan, Ta-Shun Wei, Chen-Yu Yu

    Astronomy & Astrophysics 681 A79-A79 2024年1月18日

    出版者・発行元: EDP Sciences

    DOI: 10.1051/0004-6361/202347932  

    ISSN:0004-6361

    eISSN:1432-0746

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    In April 2019, the Event Horizon Telescope (EHT) Collaboration reported the first-ever event-horizon-scale images of a black hole, resolving the central compact radio source in the giant elliptical galaxy M 87. These images reveal a ring with a southerly brightness distribution and a diameter of ∼42 μas, consistent with the predicted size and shape of a shadow produced by the gravitationally lensed emission around a supermassive black hole. These results were obtained as part of the April 2017 EHT observation campaign, using a global very long baseline interferometric radio array operating at a wavelength of 1.3 mm. Here, we present results based on the second EHT observing campaign, taking place in April 2018 with an improved array, wider frequency coverage, and increased bandwidth. In particular, the additional baselines provided by the Greenland telescope improved the coverage of the array. Multiyear EHT observations provide independent snapshots of the horizon-scale emission, allowing us to confirm the persistence, size, and shape of the black hole shadow, and constrain the intrinsic structural variability of the accretion flow. We have confirmed the presence of an asymmetric ring structure, brighter in the southwest, with a median diameter of 43.3−3.1+1.5 μas. The diameter of the 2018 ring is remarkably consistent with the diameter obtained from the previous 2017 observations. On the other hand, the position angle of the brightness asymmetry in 2018 is shifted by about 30° relative to 2017. The perennial persistence of the ring and its diameter robustly support the interpretation that the ring is formed by lensed emission surrounding a Kerr black hole with a mass ∼6.5 × 109 M. The significant change in the ring brightness asymmetry implies a spin axis that is more consistent with the position angle of the large-scale jet.

  9. Gamma rays from a reverse shock with turbulent magnetic fields in GRB 180720B 査読有り

    Makoto Arimoto, Katsuaki Asano, Koji S. Kawabata, Kenji Toma, Ramandeep Gill, Jonathan Granot, Masanori Ohno, Shuta Takahashi, Naoki Ogino, Hatsune Goto, Kengo Nakamura, Tatsuya Nakaoka, Kengo Takagi, Miho Kawabata, Masayuki Yamanaka, Mahito Sasada, Soebur Razzaque

    Nature Astronomy 8 (1) 134-144 2023年11月23日

    出版者・発行元: Springer Science and Business Media LLC

    DOI: 10.1038/s41550-023-02119-1  

    eISSN:2397-3366

  10. High-energy Neutrino Emission Associated with Gravitational-wave Signals: Effects of Cocoon Photons and Constraints on Late-time Emission 査読有り

    Riki Matsui, Shigeo S. Kimura, Kenji Toma, Kohta Murase

    The Astrophysical Journal 950 (2) 190-190 2023年6月1日

    出版者・発行元: American Astronomical Society

    DOI: 10.3847/1538-4357/acd004  

    ISSN:0004-637X

    eISSN:1538-4357

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    Abstract We investigate prospects for the detection of high-energy neutrinos produced in the prolonged jets of short gamma-ray bursts (sGRBs). The X-ray light curves of sGRBs show extended emission components lasting for 100–1000 s, which are considered to be produced by prolonged engine activity. Jets produced by such activity should interact with photons in the cocoon formed by the propagation of the jet inside the ejecta of neutron star mergers. We calculate neutrino emission from jets produced by prolonged engine activity, taking account of the interaction between photons provided from the cocoon and cosmic rays accelerated in the jets. We find that IceCube-Gen2, a future neutrino telescope, with second-generation gravitational-wave detectors will probably be able to observe neutrino signals associated with gravitational waves with around 10 years of operation, regardless of the assumed value of the Lorentz factor of the jets. Neutrino observations may enable us to constrain the dissipation region of the jets. We apply this model to GRB 211211A, a peculiar long GRB whose origin may be a binary neutron star merger. Our model predicts that IceCube is unlikely to detect any associated neutrinos, but a few similar events will be able to put a meaningful constraint on the physical quantities of the prolonged engine activities.

  11. Onset model of mutually catalytic self-replicative systems formed by an assembly of polynucleotides 査読有り

    Yasuji Sawada, Yasukazu Daigaku, Kenji Toma

    Physical Review E 107 (5) 2023年5月11日

    出版者・発行元: American Physical Society (APS)

    DOI: 10.1103/physreve.107.054404  

    ISSN:2470-0045

    eISSN:2470-0053

  12. Synchrotron Polarization of Gamma-Ray Burst Afterglow Shocks with Hydrodynamic-scale Turbulent Magnetic Field 査読有り

    Asuka Kuwata, Kenji Toma, Shigeo S. S. Kimura, Sara Tomita, Jiro Shimoda

    ASTROPHYSICAL JOURNAL 943 (2) 2023年2月

    DOI: 10.3847/1538-4357/acac88  

    ISSN:0004-637X

    eISSN:1538-4357

  13. Simultaneous radio and optical polarimetry of GRB 191221B afterglow 査読有り

    Yuji Urata, Kenji Toma, Stefano Covino, Klaas Wiersema, Kuiyun Huang, Jiro Shimoda, Asuka Kuwata, Sota Nagao, Keiichi Asada, Hiroshi Nagai, Satoko Takahashi, Chao-En Chung, Glen Petitpas, Kazutaka Yamaoka, Luca Izzo, Johan Fynbo, Antonio de Ugarte Postigo, Maryam Arabsalmani, Makoto Tashiro

    Nature Astronomy 7 (1) 80-87 2022年12月8日

    DOI: 10.1038/s41550-022-01832-7  

    ISSN:2397-3366

    eISSN:2397-3366

  14. Magnetic Reconnection in Black Hole Magnetospheres: Lepton Loading into Jets, Superluminal Radio Blobs, and Multiwavelength Flares 査読有り

    Shigeo S. Kimura, Kenji Toma, Hirofumi Noda, Kazuhiro Hada

    The Astrophysical Journal Letters 937 (2) L34-L34 2022年10月1日

    出版者・発行元: American Astronomical Society

    DOI: 10.3847/2041-8213/ac8d5a  

    ISSN:2041-8205

    eISSN:2041-8213

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    Abstract Supermassive black holes in active galactic nuclei launch relativistic jets, as indicated by observed superluminal radio blobs. The energy source of these jets is widely discussed in the theoretical framework of the Blandford–Znajek process, the electromagnetic energy extraction from rotating black holes (BHs), while the formation mechanism of the radio blobs in the electromagnetically dominated jets has been a long-standing problem. Recent high-resolution magnetohydrodynamic simulations of magnetically arrested disks exhibited magnetic reconnection in a transient magnetically dominated part of the equatorial disk near the BH horizon, which led to a promising scenario of efficient MeV gamma-ray production and subsequent electron–positron pair loading into the BH magnetosphere. We develop this scenario to build a theoretical framework on energetics, timescales, and particle number density of the superluminal radio blobs and discuss observable signatures in other wave bands. We analytically show that the nonthermal electrons emit broadband photons from optical to multi-MeV bands. The electron–positron pairs produced in the magnetosphere are optically thick for synchrotron self-absorption, so that the injected energy is stored in the plasma. The stored energy is enough to power the superluminal radio blobs observed in M87. This scenario predicts rather dim radio blobs around Sgr A*, which are consistent with no clear detection by current facilities. In addition, this scenario inevitably produces strong X-ray flares in a short timescale, which will be detectable by future X-ray satellites.

  15. Interaction of a Relativistic Magnetized Collisionless Shock with a Dense Clump 査読有り

    Sara Tomita, Yutaka Ohira, Shigeo S. Kimura, Kengo Tomida, Kenji Toma

    The Astrophysical Journal Letters 2022年9月1日

    DOI: 10.3847/2041-8213/ac88be  

  16. High-energy Gamma Rays from Magnetically Arrested Disks in Nearby Radio Galaxies 査読有り

    Riku Kuze, Shigeo S. Kimura, Kenji Toma

    The Astrophysical Journal 935 (2) 159-159 2022年8月1日

    出版者・発行元: American Astronomical Society

    DOI: 10.3847/1538-4357/ac7ec1  

    ISSN:0004-637X

    eISSN:1538-4357

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    Abstract The origins of the GeV gamma rays from nearby radio galaxies are unknown. Hadronic emission from magnetically arrested disks (MADs) around central black holes is proposed as a possible scenario. Particles are accelerated in a MAD by magnetic reconnection and stochastic turbulence acceleration. We pick out the 15 brightest radio galaxies in the GeV band from The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope, Data Release 2 and apply the MAD model. We find that we can explain the data in the GeV bands by the MAD model if the accretion rate is lower than 0.1% of the Eddington rate. For a higher accretion rate, GeV gamma rays are absorbed by two-photon interaction due to copious low-energy photons. If we assume another proposed prescription of the electron-heating rate by magnetic reconnection, the MAD model fails to reproduce the GeV data for the majority of our sample. This indicates that the electron-heating rate is crucial. We also apply the MAD model to Sagittarius A* (Sgr A*) and find that GeV gamma rays observed at the Galactic center do not come from the MAD of Sgr A*. We estimate the cosmic ray (CR) intensity from Sgr A*, but it is too low to explain the high-energy CR intensity on Earth.

  17. Selective Dynamical Imaging of Interferometric Data

    Joseph Farah, Peter Galison, Kazunori Akiyama, Katherine L. Bouman, Geoffrey C. Bower, Andrew Chael, Antonio Fuentes, Jose L. Gomez, Mareki Honma, Michael D. Johnson, Yutaro Kofuji, Daniel P. Marrone, Kotaro Moriyama, Ramesh Narayan, Dominic W. Pesce, Paul Tiede, Maciek Wielgus, Guang-Yao Zhao, Antxon Alberdi, Walter Alef, Juan Carlos Algaba, Richard Anantua, Keiichi Asada, Rebecca Azulay, Anne-Kathrin Baczkovic, David Ball, Mislay Balokovic, John Barrett, Bradford A. Benson, Dan Bintley, Lindy Blackburn, Raymond Blundell, Wilfred Boland, Hope Boyce, Michael Bremer, Christiaan D. Brinkerink, Roger Brissenden, Silke Britzen, Avery E. Broderick, Dominique Broguiere, Thomas Bronzwaer, Sandra Bustamente, Do-Young Byun, John E. Carlstrom, Chi-kwan Chan, Koushik Chatterjee, Shami Chatterjee, Ming-Tang Chen, Yongjun Chen, Ilje Cho, Pierre Christian, John E. Conway, James M. Cordes, Thomas M. Crawford, Geoffrey B. Crew, Alejandro Cruz-Osorio, Yuzhu Cui, Jordy Davelaar, Mariafelicia De Laurentis, Roger Deane, Jessica Dempsey, Gregory Desvignes, Sheperd S. Doeleman, Ralph P. Eatough, Heino Falcke, Vincent L. Fish, Ed Fomalont, H. Alyson Ford, Raquel Fraga-Encinas, Per Friberg, Christian M. Fromm, Charles F. Gammie, Roberto Garc'a, Olivier Gentaz, Ciriaco Goddi, Roman Gold, Arturo Gomez-Ruiz, Minfeng Gu, Mark Gurwell, Kazuhiro Hada, Daryl Haggard, Michael H. Hecht, Ronald Hesper, Luis C. Ho, Paul Ho, Chih-Wei L. Huang, Lei Huang, David H. Hughes, Shiro Ikeda, Makoto Inoue, Sara Issaoun, David J. James, Buell T. Jannuzi, Michael Janssen, Britton Jeter, Wu Jiang, Alejandra Jimenez-Rosales, Svetlana Jorstad, Taehyun Jung, Mansour Karami, Ramesh Karuppusamy, Tomohisa Kawashima, Garrett K. Keating, Mark Kettenis, Dong-Jin Kim, Jae-Young Kim, Jongsoo Kim, Junhan Kim, Motoki Kino, Jun Yi Koay, Patrick M. Koch, Shoko Koyama, Carsten Kramer, Michael Kramer, Thomas P. Krichbaum, Cheng-Yu Kuo, Tod R. Lauer, Sang-Sung Lee, Aviad Levis, Yan-Rong Li, Zhiyuan Li, Rocco Lico, Greg Lindahl, Michael Lindqvist, Jun Liu, Kuo Liu, Elisabetta Liuzzo, Wen-Ping Lo, Andrei P. Lobanov, Laurent Loinard, Colin Lonsdale, Ru-Sen Lu, Nicholas R. MacDonald, Jirong Mao, Nicola Marchili, Sera Markoff, Alan P. Marscher, Ivan Marti-Vidal, Satoki Matsushita, Lynn D. Matthews, Lia Medeiros, Karl M. Menten, Izumi Mizuno, Yosuke Mizuno, James M. Moran, Monika Moscibrodzka, Cornelia Muller, Alejandro Mus Mejas, Gibwa Musoke, Hiroshi Nagai, Neil M. Nagar, Masanori Nakamura, Gopal Narayanan, Iniyan Natarajan, Antonios Nathanail, Joey Neilsen, Roberto Neri, Chunchong Ni, Aristeidis Noutsos, Michael A. Nowak, Hiroki Okino, Hector Olivares, Gisela N. Ortiz-Leon, Tomoaki Oyama, Feryal Zel, Daniel C. M. Palumbo, Jongho Park, Nimesh Patel, Ue-Li Pen, Vincent Pietu, Richard Plambeck, Aleksandar PopStefanija, Oliver Porth, Felix M. Potzl, Ben Prather, Jorge A. Preciado-Lopez, Dimitrios Psaltis, Hung-Yi Pu, Venkatessh Ramakrishnan, Ramprasad Rao, Mark G. Rawlings, Alexander W. Raymond, Luciano Rezzolla, Bart Ripperda, Freek Roelofs, Alan Rogers, Eduardo Ros, Mel Rose, Arash Roshanineshat, Helge Rottmann, Alan L. Roy, Chet Ruszczyk, Kazi L. J. Rygl, Salvador Sanchez, David Sanchez-Arguelles, Mahito Sasada, Tuomas Savolainen, F. Peter Schloerb, Karl-Friedrich Schuster, Lijing Shao, Zhiqiang Shen, Des Small, Bong Won Sohn, Jason SooHoo, He Sun, Fumie Tazaki, Alexandra J. Tetarenko, Remo P. J. Tilanus, Michael Titus, Kenji Toma, Pablo Torne, Efthalia Traianou, Tyler Trent, Sascha Trippe, Ilse van Bemmel, Huib Jan van Langevelde, Daniel R. van Rossum, Jan Wagner, Derek Ward-Thompson, John Wardle, Jonathan Weintroub, Norbert Wex, Robert Wharton, Kaj Wiik, George N. Wong, Qingwen Wu, Doosoo Yoon, Andre Young, Ken Young, Ziri Younsi, Feng Yuan, Ye-Fei Yuan, J. Anton Zensus, Shan-Shan Zhao

    ASTROPHYSICAL JOURNAL LETTERS 930 (2) 2022年5月

    DOI: 10.3847/2041-8213/ac6615  

    ISSN:2041-8205

    eISSN:2041-8213

  18. The Variability of the Black Hole Image in M87 at the Dynamical Timescale

    Kaushik Satapathy, Dimitrios Psaltis, Feryal Özel, Lia Medeiros, Sean T. Dougall, Chi-Kwan Chan, Maciek Wielgus, Ben S. Prather, George N. Wong, Charles F. Gammie, Kazunori Akiyama, Antxon Alberdi, Walter Alef, Juan Carlos Algaba, Richard Anantua, Keiichi Asada, Rebecca Azulay, Anne-Kathrin Baczko, David Ball, Mislav Baloković, John Barrett, Bradford A. Benson, Dan Bintley, Lindy Blackburn, Raymond Blundell, Wilfred Boland, Katherine L. Bouman, Geoffrey C. Bower, Hope Boyce, Michael Bremer, Christiaan D. Brinkerink, Roger Brissenden, Silke Britzen, Avery E. Broderick, Dominique Broguiere, Thomas Bronzwaer, Sandra Bustamente, Do-Young Byun, John E. Carlstrom, Andrew Chael, Koushik Chatterjee, Shami Chatterjee, Ming-Tang Chen, Yongjun Chen, Ilje Cho, Pierre Christian, John E. Conway, James M. Cordes, Thomas M. Crawford, Geoffrey B. Crew, Alejandro Cruz-Osorio, Yuzhu Cui, Jordy Davelaar, Mariafelicia De Laurentis, Roger Deane, Jessica Dempsey, Gregory Desvignes, Jason Dexter, Sheperd S. Doeleman, Ralph P. Eatough, Heino Falcke, Joseph Farah, Vincent L. Fish, Ed Fomalont, H. Alyson Ford, Raquel Fraga-Encinas, Per Friberg, Christian M. Fromm, Antonio Fuentes, Peter Galison, Roberto García, Olivier Gentaz, Boris Georgiev, Ciriaco Goddi, Roman Gold, Arturo I. Gómez-Ruiz, José L. Gómez, Minfeng Gu, Mark Gurwell, Kazuhiro Hada, Daryl Haggard, Michael H. Hecht, Ronald Hesper, Luis C. Ho, Paul Ho, Mareki Honma, Chih-Wei L. Huang, Lei Huang, David H. Hughes, Shiro Ikeda, Makoto Inoue, Sara Issaoun, David J. James, Buell T. Jannuzi, Michael Janssen, Britton Jeter, Wu Jiang, Alejandra Jimenez-Rosales, Michael D. Johnson, Svetlana Jorstad, Taehyun Jung, Mansour Karami, Ramesh Karuppusamy, Tomohisa Kawashima, Garrett K. Keating, Mark Kettenis, Dong-Jin Kim, Jae-Young Kim, Jongsoo Kim, Junhan Kim, Motoki Kino, Jun Yi Koay, Yutaro Kofuji, Patrick M. Koch, Shoko Koyama, Carsten Kramer, Michael Kramer, Thomas P. Krichbaum, Cheng-Yu Kuo, Tod R. Lauer, Sang-Sung Lee, Aviad Levis, Yan-Rong Li, Zhiyuan Li, Michael Lindqvist, Rocco Lico, Greg Lindahl, Jun Liu, Kuo Liu, Elisabetta Liuzzo, Wen-Ping Lo, Andrei P. Lobanov, Laurent Loinard, Colin Lonsdale, Ru-Sen Lu, Nicholas R. MacDonald, Jirong Mao, Nicola Marchili, Sera Markoff, Daniel P. Marrone, Alan P. Marscher, Iván Martí-Vidal, Satoki Matsushita, Lynn D. Matthews, Karl M. Menten, Izumi Mizuno, Yosuke Mizuno, James M. Moran, Kotaro Moriyama, Monika Moscibrodzka, Cornelia Müller, Alejandro Mus Mejías, Gibwa Musoke, Hiroshi Nagai, Neil M. Nagar, Masanori Nakamura, Ramesh Narayan, Gopal Narayanan, Iniyan Natarajan, Antonios Nathanail, Joey Neilsen, Roberto Neri, Chunchong Ni, Aristeidis Noutsos, Michael A. Nowak, Hiroki Okino, Héctor Olivares, Gisela N. Ortiz-León, Tomoaki Oyama, Daniel C. M. Palumbo, Jongho Park, Nimesh Patel, Ue-Li Pen, Dominic W. Pesce, Vincent Piétu, Richard Plambeck, Aleksandar PopStefanija, Oliver Porth, Felix M. Pötzl, Jorge A. Preciado-López, Hung-Yi Pu, Venkatessh Ramakrishnan, Ramprasad Rao, Mark G. Rawlings, Alexander W. Raymond, Luciano Rezzolla, Bart Ripperda, Freek Roelofs, Alan Rogers, Eduardo Ros, Mel Rose, Arash Roshanineshat, Helge Rottmann, Alan L. Roy, Chet Ruszczyk, Kazi L. J. Rygl, Salvador Sánchez, David Sánchez-Arguelles, Mahito Sasada, Tuomas Savolainen, F. Peter Schloerb, Karl-Friedrich Schuster, Lijing Shao, Zhiqiang Shen, Des Small, Bong Won Sohn, Jason SooHoo, He Sun, Fumie Tazaki, Alexandra J. Tetarenko, Paul Tiede, Remo P. J. Tilanus, Michael Titus, Kenji Toma, Pablo Torne, Efthalia Traianou, Tyler Trent, Sascha Trippe, Ilse van Bemmel, Huib Jan van Langevelde, Daniel R. van Rossum, Jan Wagner, Derek Ward-Thompson, John Wardle, Jonathan Weintroub, Norbert Wex, Robert Wharton, Kaj Wiik, Qingwen Wu, Doosoo Yoon, André Young, Ken Young, Ziri Younsi, Feng Yuan, Ye-Fei Yuan, J. Anton Zensus, Guang-Yao Zhao, Shan-Shan Zhao

    The Astrophysical Journal 925 (1) 13-13 2022年1月1日

    出版者・発行元: American Astronomical Society

    DOI: 10.3847/1538-4357/ac332e  

    ISSN:0004-637X

    eISSN:1538-4357

    詳細を見る 詳細を閉じる

    Abstract The black hole images obtained with the Event Horizon Telescope (EHT) are expected to be variable at the dynamical timescale near their horizons. For the black hole at the center of the M87 galaxy, this timescale (5–61 days) is comparable to the 6 day extent of the 2017 EHT observations. Closure phases along baseline triangles are robust interferometric observables that are sensitive to the expected structural changes of the images but are free of station-based atmospheric and instrumental errors. We explored the day-to-day variability in closure-phase measurements on all six linearly independent nontrivial baseline triangles that can be formed from the 2017 observations. We showed that three triangles exhibit very low day-to-day variability, with a dispersion of ∼3°–5°. The only triangles that exhibit substantially higher variability (∼90°–180°) are the ones with baselines that cross the visibility amplitude minima on the u–v plane, as expected from theoretical modeling. We used two sets of general relativistic magnetohydrodynamic simulations to explore the dependence of the predicted variability on various black hole and accretion-flow parameters. We found that changing the magnetic field configuration, electron temperature model, or black hole spin has a marginal effect on the model consistency with the observed level of variability. On the other hand, the most discriminating image characteristic of models is the fractional width of the bright ring of emission. Models that best reproduce the observed small level of variability are characterized by thin ring-like images with structures dominated by gravitational lensing effects and thus least affected by turbulence in the accreting plasmas.

  19. The Response of Black Hole Spark Gaps to External Changes: A Production Mechanism of Rapid TeV Flares? 査読有り

    Shota Kisaka, Amir Levinson, Kenji Toma, Idan Niv

    The Astrophysical Journal 924 (1) 28-28 2022年1月1日

    出版者・発行元: American Astronomical Society

    DOI: 10.3847/1538-4357/ac35da  

    ISSN:0004-637X

    eISSN:1538-4357

    詳細を見る 詳細を閉じる

    <title>Abstract</title> We study the response of a starved Kerr black hole magnetosphere to abrupt changes in the intensity of disk emission and in the global magnetospheric current, by means of one-dimensional general relativistic particle-in-cell simulations. Such changes likely arise from the intermittency of the accretion process. We find that in cases where the pair-production opacity contributed by the soft disk photons is modest, as in, e.g., M87, such changes can give rise to delayed, strong teraelectronvolt (TeV) flares, dominated by curvature emission of particles accelerated in the gap. The flare rise time, and the delay between the external variation and the onset of the flare emitted from the outer gap boundary, are of the order of the light-crossing time of the gap. The rapid, large-amplitude TeV flares observed in M87, and perhaps, other active galactic nuclei may be produced by such a mechanism.

  20. Backreaction of mass and angular momentum accretion on black holes: General formulation of metric perturbations and application to the Blandford–Znajek process 査読有り

    Masashi Kimura, Tomohiro Harada, Atsushi Naruko, Kenji Toma

    Progress of Theoretical and Experimental Physics 2021 (9) 2021年9月7日

    出版者・発行元: Oxford University Press (OUP)

    DOI: 10.1093/ptep/ptab101  

    eISSN:2050-3911

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    <title>Abstract</title> We study the metric backreaction of mass and angular momentum accretion on black holes. We first develop the formalism of monopole and dipole linear gravitational perturbations around Schwarzschild black holes in Eddington–Finkelstein coordinates against generic time-dependent matter. We derive the relation between the time dependence of the mass and angular momentum of the black hole and the energy–momentum tensors of accreting matter. As a concrete example, we apply our formalism to the Blandford–Znajek process around slowly rotating black holes. We find that the time dependence of the monopole and dipole perturbations can be interpreted as a slowly rotating Kerr metric with time-dependent mass and spin parameters, which are determined from the energy and angular momentum extraction rates of the Blandford–Znajek process. We also show that the Komar angular momentum and the area of the apparent horizon are decreasing and increasing in time, respectively, while they are consistent with the Blandford–Znajek argument of energy extraction in terms of black hole mechanics if we regard the time-dependent mass parameter as the energy of the black hole.

  21. Constraints on black-hole charges with the 2017 EHT observations of M87* 査読有り

    Prashant Kocherlakota, Luciano Rezzolla, Heino Falcke, Christian M. Fromm, Michael Kramer, Yosuke Mizuno, Antonios Nathanail, Héctor Olivares, Ziri Younsi, Event Horizon Telescope Collaboration

    Physical Review D 103 (10) 2021年5月20日

    出版者・発行元: American Physical Society (APS)

    DOI: 10.1103/physrevd.103.104047  

    ISSN:2470-0010

    eISSN:2470-0029

  22. Multi-wave band Synchrotron Polarization of Gamma-Ray Burst Afterglows 査読有り

    Jiro Shimoda, Kenji Toma

    The Astrophysical Journal 913 (1) 58-58 2021年5月1日

    DOI: 10.3847/1538-4357/abf2c2  

    ISSN:0004-637X

    eISSN:1538-4357

  23. The Polarized Image of a Synchrotron-emitting Ring of Gas Orbiting a Black Hole 査読有り

    Ramesh Narayan, Daniel C. M. Palumbo, Michael D. Johnson, Zachary Gelles, Elizabeth Himwich, Dominic O. Chang, Angelo Ricarte, Jason Dexter, Charles F. Gammie, Andrew A. Chael, Event Horizon Telescope Collaboration

    The Astrophysical Journal 912 (1) 35-35 2021年5月1日

    出版者・発行元: American Astronomical Society

    DOI: 10.3847/1538-4357/abf117  

    ISSN:0004-637X

    eISSN:1538-4357

  24. Broadband Multi-wavelength Properties of M87 during the 2017 Event Horizon Telescope Campaign 査読有り

    J. C. Algaba, J. Anczarski, K. Asada, M. Baloković, S. Chandra, Y.-Z. Cui, A. D. Falcone, M. Giroletti, C. Goddi, K. Hada, D. Haggard, S. Jorstad, A. Kaur, T. Kawashima, G. Keating, J.-Y. Kim, M. Kino, S. Komossa, E. V. Kravchenko, T. P. Krichbaum, S.-S. Lee, R.-S. Lu, M. Lucchini, S. Markoff, J. Neilsen, M. A. Nowak, J. Park, G. Principe, V. Ramakrishnan, M. T. Reynolds, M. Sasada, S. S. Savchenko, K. E. Williamson, Event Horizon Telescope Collaboration

    The Astrophysical Journal Letters 911 (1) L11-L11 2021年4月1日

    出版者・発行元: American Astronomical Society

    DOI: 10.3847/2041-8213/abef71  

    ISSN:2041-8205

    eISSN:2041-8213

  25. Matter Density Distribution of General Relativistic Highly Magnetized Jets Driven by Black Holes 査読有り

    Taiki Ogihara, Takumi Ogawa, Kenji Toma

    The Astrophysical Journal 911 (1) 34-34 2021年4月1日

    出版者・発行元: American Astronomical Society

    DOI: 10.3847/1538-4357/abe61b  

    ISSN:0004-637X

    eISSN:1538-4357

  26. Polarimetric Properties of Event Horizon Telescope Targets from ALMA 査読有り

    Ciriaco Goddi, Iván Martí-Vidal, Hugo Messias, Geoffrey C. Bower, Avery E. Broderick, Jason Dexter, Daniel P. Marrone, Monika Moscibrodzka, Hiroshi Nagai, Juan Carlos Algaba, Keiichi Asada, Geoffrey B. Crew, José L. Gómez, C. M. Violette Impellizzeri, Michael Janssen, Matthias Kadler, Thomas P. Krichbaum, Rocco Lico, Lynn D. Matthews, Antonios Nathanail, Angelo Ricarte, Eduardo Ros, Ziri Younsi, Event Horizon Telescope Collaboration

    The Astrophysical Journal Letters 910 (1) L14-L14 2021年3月1日

    出版者・発行元: American Astronomical Society

    DOI: 10.3847/2041-8213/abee6a  

    ISSN:2041-8205

    eISSN:2041-8213

  27. First M87 Event Horizon Telescope Results. VIII. Magnetic Field Structure near The Event Horizon 査読有り

    Event Horizon Telescope Collaboration

    The Astrophysical Journal Letters 910 (1) L13-L13 2021年3月1日

    出版者・発行元: American Astronomical Society

    DOI: 10.3847/2041-8213/abe4de  

    ISSN:2041-8205

    eISSN:2041-8213

  28. First M87 Event Horizon Telescope Results. VII. Polarization of the Ring 査読有り

    Event Horizon Telescope Collaboration

    The Astrophysical Journal Letters 910 (1) L12-L12 2021年3月1日

    出版者・発行元: American Astronomical Society

    DOI: 10.3847/2041-8213/abe71d  

    ISSN:2041-8205

    eISSN:2041-8213

  29. A Jet-bases Emission Model of the EHT2017 Image of M87* 査読有り

    Tomohisa Kawashima, Kenji Toma, Motoki Kino, Kazunori Akiyama, Masanori Nakamura, Kotaro Moriyama

    The Astrophysical Journal 909 (2) 168-168 2021年3月1日

    出版者・発行元: American Astronomical Society

    DOI: 10.3847/1538-4357/abd5bb  

    ISSN:0004-637X

    eISSN:1538-4357

  30. Hadronic High-energy Emission from Magnetically Arrested Disks in Radio Galaxies 査読有り

    Shigeo S. Kimura, Kenji Toma

    The Astrophysical Journal 905 (2) 178-178 2020年12月28日

    出版者・発行元: American Astronomical Society

    DOI: 10.3847/1538-4357/abc343  

    eISSN:1538-4357

  31. High-z gamma-ray bursts unraveling the dark ages and extreme space-time mission: HiZ-GUNDAM

    Daisuke Yonetoku, Tatehiro Mihara, Akihiro Doi, Takanori Sakamoto, Kohji Tsumura, Kunihito Ioka, Yusuke Amaya, Makoto Arimoto, Teruaki Enoto, Takeru Fujii, Hatsune Goto, Shuichi Gunji, Junko Hiraga, Hirokazu Ikeda, Nobuyuki Kawai, Shunsuke Kurosawa, Jin Li, Yoshitomo Maeda, Ikuyuki Mitsuishi, Toshio Murakami, Yujin Nakagawa, Naoki Ogino, Masanori Ohno, Tatsuya Sawano, Kensho Sei, Motoko Serino, Satoshi Sugita, Toru Tamagawa, Keisuke Tamura, Takaaki Tanaka, Toru Tanimori, Makoto S. Tashiro, Hiroshi Tomida, Hyeongsoon Wang, Tomohiro Yamaguchi, Ayumi Yamamoto, Kazutaka Yamaoka, Makoto Yamauchi, Yoichi Yatsu, Atsumasa Yoshida, Daito Yuhi, Hiroshi Akitaya, Akihiko Fukui, Yoshifusa Ita, Hidehiro Kaneda, Koji Kawabata, Yoshikatsu Kawata, Miku Kurimata, Toshio Matsumoto, Shuji Matsuura, Akihiro Miyasaka, Kentaro Motohara, Norio Narita, Hirofumi Noda, Akisato Ohashi, Hirofumi Okita, Kei Sano, Masaomi Tanaka, Yuji Urata, Takehiko Wada, Hikaru Yamaguchi, Kenshi Yanagisawa, Michitoshi Yoshida, Katsuaki Asano, Kohei Inayoshi, Susumu Inoue, Hirotaka Ito, Hideyuki Izumiura, Norita Kawanaka, Tomoya Kinugawa, Shota Kisaka, Kenta Kiuchi, Jin Matsumoto, Akira Mizuta, Kohta Murase, Hiroki Nagakura, Shigehiro Nagataki, Yoshikazu Nakada, Takashi Nakamura, Yuu Niino, Yudai Suwa, Keitaro Takahashi, Takahiro Tanaka, Kenji Toma, Tomonori Totani, Ryo Yamazaki, Jun'ichi Yokoyama

    Space Telescopes and Instrumentation 2020: Ultraviolet to Gamma Ray 2020年12月13日

    出版者・発行元: SPIE

    DOI: 10.1117/12.2560603  

  32. Probing Particle Acceleration through Broadband Early Afterglow Emission of MAGIC Gamma-Ray Burst GRB 190114C 査読有り

    Katsuaki Asano, Kohta Murase, Kenji Toma

    The Astrophysical Journal 905 105 2020年12月

  33. Comprehensive Analysis of Magnetospheric Gaps around Kerr Black Holes Using 1D GRPIC Simulations 査読有り

    Shota Kisaka, Amir Levinson, Kenji Toma

    The Astrophysical Journal 902 (1) 80-80 2020年10月14日

    出版者・発行元: American Astronomical Society

    DOI: 10.3847/1538-4357/abb46c  

    eISSN:1538-4357

  34. Monitoring the Morphology of M87* in 2009–2017 with the Event Horizon Telescope 査読有り

    Maciek Wielgus, Kazunori Akiyama, Lindy Blackburn, Chi-kwan Chan, Jason Dexter, Sheperd S. Doeleman, Vincent L. Fish, Sara Issaoun, Michael D. Johnson, Thomas P. Krichbaum, Ru-Sen Lu, Dominic W. Pesce, George N. Wong, Geoffrey C. Bower, Avery E. Broderick, Andrew Chael, Koushik Chatterjee, Charles F. Gammie, Boris Georgiev, Kazuhiro Hada, Laurent Loinard, Sera Markoff, Daniel P. Marrone, Richard Plambeck, Jonathan Weintroub, Matthew Dexter, David H. E. MacMahon, Melvyn Wright, Event Horizon Telescope Collaboration

    The Astrophysical Journal 901 (1) 67-67 2020年9月23日

    出版者・発行元: American Astronomical Society

    DOI: 10.3847/1538-4357/abac0d  

    eISSN:1538-4357

  35. Event Horizon Telescope imaging of the archetypal blazar 3C 279 at an extreme 20 microarcsecond resolution 査読有り

    Jae-Young Kim, Thomas P. Krichbaum, Avery E. Broderick, Maciek Wielgus, Lindy Blackburn, José L. Gómez, Michael D. Johnson, Katherine L. Bouman, Andrew Chael, Kazunori Akiyama, Svetlana Jorstad, Alan P. Marscher, Sara Issaoun, Michael Janssen, Chi-kwan Chan, Tuomas Savolainen, Dominic W. Pesce, Feryal Özel, Antxon Alberdi, Walter Alef, Keiichi Asada, Rebecca Azulay, Anne-Kathrin Baczko, David Ball, Mislav Baloković, John Barrett, Dan Bintley, Wilfred Boland, Geoffrey C. Bower, Michael Bremer, Christiaan D. Brinkerink, Roger Brissenden, Silke Britzen, Dominique Broguiere, Thomas Bronzwaer, Do-Young Byun, John E. Carlstrom, Shami Chatterjee, Koushik Chatterjee, Ming-Tang Chen, Yongjun Chen, Ilje Cho, Pierre Christian, John E. Conway, James M. Cordes, Geoffrey B. Crew, Yuzhu Cui, Jordy Davelaar, Mariafelicia De Laurentis, Roger Deane, Jessica Dempsey, Gregory Desvignes, Jason Dexter, Sheperd S. Doeleman, Ralph P. Eatough, Heino Falcke, Vincent L. Fish, Ed Fomalont, Raquel Fraga-Encinas, Per Friberg, Christian M. Fromm, Peter Galison, Charles F. Gammie, Roberto García, Olivier Gentaz, Boris Georgiev, Ciriaco Goddi, Roman Gold, Arturo I. Gómez-Ruiz, Minfeng Gu, Mark Gurwell, Kazuhiro Hada, Michael H. Hecht, Ronald Hesper, Luis C. Ho, Paul Ho, Mareki Honma, Chih-Wei L. Huang, Lei Huang, David H. Hughes, Shiro Ikeda, Makoto Inoue, David J. James, Buell T. Jannuzi, Britton Jeter, Wu Jiang, Alejandra Jimenez-Rosales, Taehyun Jung, Mansour Karami, Ramesh Karuppusamy, Tomohisa Kawashima, Garrett K. Keating, Mark Kettenis, Junhan Kim, Jongsoo Kim, Motoki Kino, Jun Yi Koay, Patrick M. Koch, Shoko Koyama, Michael Kramer, Carsten Kramer, Cheng-Yu Kuo, Tod R. Lauer, Sang-Sung Lee, Yan-Rong Li, Zhiyuan Li, Michael Lindqvist, Rocco Lico, Kuo Liu, Elisabetta Liuzzo, Wen-Ping Lo, Andrei P. Lobanov, Laurent Loinard, Colin Lonsdale, Ru-Sen Lu, Nicholas R. MacDonald, Jirong Mao, Sera Markoff, Daniel P. Marrone, Iván Martí-Vidal, Satoki Matsushita, Lynn D. Matthews, Lia Medeiros, Karl M. Menten, Yosuke Mizuno, Izumi Mizuno, James M. Moran, Kotaro Moriyama, Monika Moscibrodzka, Gibwa Musoke, Cornelia Müller, Hiroshi Nagai, Neil M. Nagar, Masanori Nakamura, Ramesh Narayan, Gopal Narayanan, Iniyan Natarajan, Roberto Neri, Chunchong Ni, Aristeidis Noutsos, Hiroki Okino, Héctor Olivares, Gisela N. Ortiz-León, Tomoaki Oyama, Daniel C. M. Palumbo, Jongho Park, Nimesh Patel, Ue-Li Pen, Vincent Piétu, Richard Plambeck, Aleksandar PopStefanija, Oliver Porth, Ben Prather, Jorge A. Preciado-López, Dimitrios Psaltis, Hung-Yi Pu, Venkatessh Ramakrishnan, Ramprasad Rao, Mark G. Rawlings, Alexander W. Raymond, Luciano Rezzolla, Bart Ripperda, Freek Roelofs, Alan Rogers, Eduardo Ros, Mel Rose, Arash Roshanineshat, Helge Rottmann, Alan L. Roy, Chet Ruszczyk, Benjamin R. Ryan, Kazi L. J. Rygl, Salvador Sánchez, David Sánchez-Arguelles, Mahito Sasada, F. Peter Schloerb, Karl-Friedrich Schuster, Lijing Shao, Zhiqiang Shen, Des Small, Bong Won Sohn, Jason SooHoo, Fumie Tazaki, Paul Tiede, Remo P. J. Tilanus, Michael Titus, Kenji Toma, Pablo Torne, Tyler Trent, Efthalia Traianou, Sascha Trippe, Shuichiro Tsuda, Ilse van Bemmel, Huib Jan van Langevelde, Daniel R. van Rossum, Jan Wagner, John Wardle, Derek Ward-Thompson, Jonathan Weintroub, Norbert Wex, Robert Wharton, George N. Wong, Qingwen Wu, Doosoo Yoon, André Young, Ken Young, Ziri Younsi, Feng Yuan, Ye-Fei Yuan, J. Anton Zensus, Guangyao Zhao, Shan-Shan Zhao, Ziyan Zhu, Juan-Carlos Algaba, Alexander Allardi, Rodrigo Amestica, Jadyn Anczarski, Uwe Bach, Frederick K. Baganoff, Christopher Beaudoin, Bradford A. Benson, Ryan Berthold, Jay M. Blanchard, Ray Blundell, Sandra Bustamente, Roger Cappallo, Edgar Castillo-Domínguez, Chih-Cheng Chang, Shu-Hao Chang, Song-Chu Chang, Chung-Chen Chen, Ryan Chilson, Tim C. Chuter, Rodrigo Córdova Rosado, Iain M. Coulson, Joseph Crowley, Mark Derome, Matthew Dexter, Sven Dornbusch, Kevin A. Dudevoir, Sergio A. Dzib, Andreas Eckart, Chris Eckert, Neal R. Erickson, Wendeline B. Everett, Aaron Faber, Joseph R. Farah, Vernon Fath, Thomas W. Folkers, David C. Forbes, Robert Freund, David M. Gale, Feng Gao, Gertie Geertsema, David A. Graham, Christopher H. Greer, Ronald Grosslein, Frédéric Gueth, Daryl Haggard, Nils W. Halverson, Chih-Chiang Han, Kuo-Chang Han, Jinchi Hao, Yutaka Hasegawa, Jason W. Henning, Antonio Hernández-Gómez, Rubén Herrero-Illana, Stefan Heyminck, Akihiko Hirota, James Hoge, Yau-De Huang, C. M. Violette Impellizzeri, Homin Jiang, David John, Atish Kamble, Ryan Keisler, Kimihiro Kimura, Yusuke Kono, Derek Kubo, John Kuroda, Richard Lacasse, Robert A. Laing, Erik M. Leitch, Chao-Te Li, Lupin C.-C. Lin, Ching-Tang Liu, Kuan-Yu Liu, Li-Ming Lu, Ralph G. Marson, Pierre L. Martin-Cocher, Kyle D. Massingill, Callie Matulonis, Martin P. McColl, Stephen R. McWhirter, Hugo Messias, Zheng Meyer-Zhao, Daniel Michalik, Alfredo Montaña, William Montgomerie, Matias Mora-Klein, Dirk Muders, Andrew Nadolski, Santiago Navarro, Joseph Neilsen, Chi H. Nguyen, Hiroaki Nishioka, Timothy Norton, Michael A. Nowak, George Nystrom, Hideo Ogawa, Peter Oshiro, Tomoaki Oyama, Harriet Parsons, Juan Peñalver, Neil M. Phillips, Michael Poirier, Nicolas Pradel, Rurik A. Primiani, Philippe A. Raffin, Alexandra S. Rahlin, George Reiland, Christopher Risacher, Ignacio Ruiz, Alejandro F. Sáez-Madaín, Remi Sassella, Pim Schellart, Paul Shaw, Kevin M. Silva, Hotaka Shiokawa, David R. Smith, William Snow, Kamal Souccar, Don Sousa, Tirupati K. Sridharan, Ranjani Srinivasan, William Stahm, Antony A. Stark, Kyle Story, Sjoerd T. Timmer, Laura Vertatschitsch, Craig Walther, Ta-Shun Wei, Nathan Whitehorn, Alan R. Whitney, David P. Woody, Jan G. A. Wouterloot, Melvin Wright, Paul Yamaguchi, Chen-Yu Yu, Milagros Zeballos, Shuo Zhang, Lucy Ziurys

    Astronomy & Astrophysics 640 A69-A69 2020年8月

    出版者・発行元: EDP Sciences

    DOI: 10.1051/0004-6361/202037493  

    ISSN:0004-6361

    eISSN:1432-0746

    詳細を見る 詳細を閉じる

    3C 279 is an archetypal blazar with a prominent radio jet that show broadband flux density variability across the entire electromagnetic spectrum. We use an ultra-high angular resolution technique – global Very Long Baseline Interferometry (VLBI) at 1.3 mm (230 GHz) – to resolve the innermost jet of 3C 279 in order to study its fine-scale morphology close to the jet base where highly variable <italic>γ</italic>-ray emission is thought to originate, according to various models. The source was observed during four days in April 2017 with the Event Horizon Telescope at 230 GHz, including the phased Atacama Large Millimeter/submillimeter Array (ALMA), at an angular resolution of ∼20 <italic>μ</italic>as (at a redshift of <italic>z</italic> = 0.536 this corresponds to ∼0.13 pc  ∼ 1700 Schwarzschild radii with a black hole mass <italic>M</italic>BH = 8 × 108 <italic>M</italic>). Imaging and model-fitting techniques were applied to the data to parameterize the fine-scale source structure and its variation. We find a multicomponent inner jet morphology with the northernmost component elongated perpendicular to the direction of the jet, as imaged at longer wavelengths. The elongated nuclear structure is consistent on all four observing days and across different imaging methods and model-fitting techniques, and therefore appears robust. Owing to its compactness and brightness, we associate the northern nuclear structure as the VLBI “core”. This morphology can be interpreted as either a broad resolved jet base or a spatially bent jet. We also find significant day-to-day variations in the closure phases, which appear most pronounced on the triangles with the longest baselines. Our analysis shows that this variation is related to a systematic change of the source structure. Two inner jet components move non-radially at apparent speeds of ∼15 <italic>c</italic> and ∼20 <italic>c</italic> (∼1.3 and ∼1.7 <italic>μ</italic>as day−1, respectively), which more strongly supports the scenario of traveling shocks or instabilities in a bent, possibly rotating jet. The observed apparent speeds are also coincident with the 3C 279 large-scale jet kinematics observed at longer (cm) wavelengths, suggesting no significant jet acceleration between the 1.3 mm core and the outer jet. The intrinsic brightness temperature of the jet components are ≲1010 K, a magnitude or more lower than typical values seen at ≥7 mm wavelengths. The low brightness temperature and morphological complexity suggest that the core region of 3C 279 becomes optically thin at short (mm) wavelengths.

  36. Verification of Radiative Transfer Schemes for the EHT 査読有り

    Roman Gold, Avery E. Broderick, Ziri Younsi, Christian M. Fromm, Charles F. Gammie, Monika Mościbrodzka, Hung-Yi Pu, Thomas Bronzwaer, Jordy Davelaar, Jason Dexter, David Ball, Chi-kwan Chan, Tomohisa Kawashima, Yosuke Mizuno, Bart Ripperda, Kazunori Akiyama, Antxon Alberdi, Walter Alef, Keiichi Asada, Rebecca Azulay, Anne-Kathrin Baczko, Mislav Baloković, John Barrett, Dan Bintley, Lindy Blackburn, Wilfred Boland, Katherine L. Bouman, Geoffrey C. Bower, Michael Bremer, Christiaan D. Brinkerink, Roger Brissenden, Silke Britzen, Dominique Broguiere, Do-Young Byun, John E. Carlstrom, Andrew Chael, Koushik Chatterjee, Shami Chatterjee, Ming-Tang Chen, Yongjun Chen, Ilje Cho, Pierre Christian, John E. Conway, James M. Cordes, Geoffrey B. Crew, Yuzhu Cui, Mariafelicia De Laurentis, Roger Deane, Jessica Dempsey, Gregory Desvignes, Sheperd S. Doeleman, Ralph P. Eatough, Heino Falcke, Vincent L. Fish, Ed Fomalont, Raquel Fraga-Encinas, Bill Freeman, Per Friberg, José L. Gómez, Peter Galison, Roberto García, Olivier Gentaz, Boris Georgiev, Ciriaco Goddi, Minfeng Gu, Mark Gurwell, Kazuhiro Hada, Michael H. Hecht, Ronald Hesper, Luis C. Ho, Paul Ho, Mareki Honma, Chih-Wei L. Huang, Lei Huang, David H. Hughes, Makoto Inoue, Sara Issaoun, David J. James, Buell T. Jannuzi, Michael Janssen, Britton Jeter, Wu Jiang, Alejandra Jimenez-Rosales, Michael D. Johnson, Svetlana Jorstad, Taehyun Jung, Mansour Karami, Ramesh Karuppusamy, Garrett K. Keating, Mark Kettenis, Jae-Young Kim, Junhan Kim, Jongsoo Kim, Motoki Kino, Jun Yi Koay, Patrick M. Koch, Shoko Koyama, Michael Kramer, Carsten Kramer, Thomas P. Krichbaum, Cheng-Yu Kuo, Tod R. Lauer, Sang-Sung Lee, Yan-Rong Li, Zhiyuan Li, Rocco Lico, Michael Lindqvist, Kuo Liu, Elisabetta Liuzzo, Wen-Ping Lo, Andrei P. Lobanov, Laurent Loinard, Colin Lonsdale, Ru-Sen Lu, Nicholas R. MacDonald, Sera Markoff, Jirong Mao, Daniel P. Marrone, Alan P. Marscher, Iván Martí-Vidal, Satoki Matsushita, Lynn D. Matthews, Lia Medeiros, Karl M. Menten, Izumi Mizuno, James M. Moran, Kotaro Moriyama, Cornelia Müller, Hiroshi Nagai, Masanori Nakamura, Neil M. Nagar, Ramesh Narayan, Gopal Narayanan, Iniyan Natarajan, Roberto Neri, Chunchong Ni, Aristeidis Noutsos, Hiroki Okino, Gisela N. Ortiz-León, Tomoaki Oyama, Feryal Özel, Daniel C. M. Palumbo, Jongho Park, Nimesh Patel, Ue-Li Pen, Dominic W. Pesce, Richard Plambeck, Vincent Piétu, Aleksandar PopStefanija, Oliver Porth, Jorge A. Preciado-López, Dimitrios Psaltis, Venkatessh Ramakrishnan, Ramprasad Rao, Mark G. Rawlings, Alexander W. Raymond, Luciano Rezzolla, Freek Roelofs, Alan Rogers, Eduardo Ros, Mel Rose, Arash Roshanineshat, Helge Rottmann, Alan L. Roy, Chet Ruszczyk, Kazi L. J. Rygl, Salvador Sánchez, David Sánchez-Arguelles, Mahito Sasada, Tuomas Savolainen, Karl-Friedrich Schuster, F. Peter Schloerb, Lijing Shao, Zhiqiang Shen, Des Small, Bong Won Sohn, Jason SooHoo, Paul Tiede, Fumie Tazaki, Remo P. J. Tilanus, Michael Titus, Kenji Toma, Pablo Torne, Tyler Trent, Thalia Traianou, Sascha Trippe, Shuichiro Tsuda, Huib Jan van Langevelde, Ilse van Bemmel, Daniel R. van Rossum, Jan Wagner, John Wardle, Norbert Wex, Jonathan Weintroub, Robert Wharton, Maciek Wielgus, George N. Wong, Qingwen Wu, Doosoo Yoon, Ken Young, André Young, Feng Yuan, Ye-Fei Yuan, J. Anton Zensus, Guangyao Zhao, Shan-Shan Zhao, Ziyan Zhu

    The Astrophysical Journal 897 (2) 148-148 2020年7月13日

    出版者・発行元: American Astronomical Society

    DOI: 10.3847/1538-4357/ab96c6  

    eISSN:1538-4357

  37. THEMIS: A Parameter Estimation Framework for the Event Horizon Telescope

    Avery E. Broderick, Roman Gold, Mansour Karami, Jorge A. Preciado-Lopez, Paul Tiede, Hung-Yi Pu, Kazunori Akiyama, Antxon Alberdi, Walter Alef, Keiichi Asada, Rebecca Azulay, Anne-Kathrin Baczko, Mislav Balokovic, John Barrett, Dan Bintley, Lindy Blackburn, Wilfred Boland, Katherine L. Bouman, Geoffrey C. Bower, Michael Bremer, Christiaan D. Brinkerink, Roger Brissenden, Silke Britzen, Dominique Broguiere, Thomas Bronzwaer, Do-Young Byun, John E. Carlstrom, Andrew Chael, Shami Chatterjee, Koushik Chatterjee, Ming-Tang Chen, Yongjun Chen, Ilje Cho, John E. Conway, James M. Cordes, Geoffrey B. Crew, Yuzhu Cui, Jordy Davelaar, Mariafelicia De Laurentis, Roger Deane, Jessica Dempsey, Gregory Desvignes, Sheperd S. Doeleman, Ralph P. Eatough, Heino Falcke, Vincent L. Fish, Ed Fomalont, Raquel Fraga-Encinas, Per Friberg, Christian M. Fromm, Peter Galison, Charles F. Gammie, Roberto Garcia, Olivier Gentaz, Boris Georgiev, Ciriaco Goddi, Jose L. Gomez, Minfeng Gu, Mark Gurwell, Kazuhiro Hada, Michael H. Hecht, Ronald Hesper, Luis C. Ho, Paul Ho, Mareki Honma, Chih-Wei L. Huang, Lei Huang, David H. Hughes, Makoto Inoue, Sara Issaoun, David J. James, Michael Janssen, Britton Jeter, Wu Jiang, Alejandra Jimenez-Rosales, Michael D. Johnson, Svetlana Jorstad, Taehyun Jung, Ramesh Karuppusamy, Tomohisa Kawashima, Garrett K. Keating, Mark Kettenis, Jae-Young Kim, Jongsoo Kim, Motoki Kino, Jun Yi Koay, Patrick M. Koch, Shoko Koyama, Michael Kramer, Carsten Kramer, Thomas P. Krichbaum, Cheng-Yu Kuo, Sang-Sung Lee, Yan-Rong Li, Zhiyuan Li, Michael Lindqvist, Rocco Lico, Kuo Liu, Elisabetta Liuzzo, Wen-Ping Lo, Andrei P. Lobanov, Laurent Loinard, Colin Lonsdale, Ru-Sen Lu, Nicholas R. MacDonald, Jirong Mao, Alan P. Marscher, Ivan Marti-Vidal, Satoki Matsushita, Lynn D. Matthews, Karl M. Menten, Yosuke Mizuno, Izumi Mizuno, James M. Moran, Kotaro Moriyama, Monika Moscibrodzka, Cornelia Muller, Hiroshi Nagai, Neil M. Nagar, Masanori Nakamura, Ramesh Narayan, Gopal Narayanan, Iniyan Natarajan, Roberto Neri, Chunchong Ni, Aristeidis Noutsos, Hiroki Okino, Hector Olivares, Gisela N. Ortiz-Leon, Tomoaki Oyama, Daniel C. M. Palumbo, Jongho Park, Ue-Li Pen, Dominic W. Pesce, Vincent Pietu, Richard Plambeck, Aleksandar PopStefanija, Oliver Porth, Ben Prather, Venkatessh Ramakrishnan, Ramprasad Rao, Mark G. Rawlings, Alexander W. Raymond, Luciano Rezzolla, Bart Ripperda, Freek Roelofs, Alan Rogers, Eduardo Ros, Mel Rose, Helge Rottmann, Chet Ruszczyk, Benjamin R. Ryan, Kazi L. J. Rygl, Salvador Sanchez, David Sanchez-Arguelles, Mahito Sasada, Tuomas Savolainen, F. Peter Schloerb, Karl-Friedrich Schuster, Lijing Shao, Zhiqiang Shen, Des Small, Bong Won Sohn, Jason SooHoo, Fumie Tazaki, Remo P. J. Tilanus, Michael Titus, Kenji Toma, Pablo Torne, Efthalia Traianou, Sascha Trippe, Shuichiro Tsuda, Ilse van Bemmel, Huib Jan van Langevelde, Daniel R. van Rossum, Jan Wagner, John Wardle, Jonathan Weintroub, Norbert Wex, Robert Wharton, Maciek Wielgus, George N. Wong, Qingwen Wu, Doosoo Yoon, Andre Young, Ken Young, Ziri Younsi, Feng Yuan, Ye-Fei Yuan, J. Anton Zensus, Guangyao Zhao, Shan-Shan Zhao, Ziyan Zhu

    ASTROPHYSICAL JOURNAL 897 (2) 2020年7月

    DOI: 10.3847/1538-4357/ab91a4  

    ISSN:0004-637X

    eISSN:1538-4357

  38. Efficient acceleration of cylindrical jets: effects of radiative cooling and tangled magnetic field 査読有り

    Shuta J Tanaka, Kenji Toma

    Monthly Notices of the Royal Astronomical Society 494 (1) 338-348 2020年5月1日

    出版者・発行元: Oxford University Press (OUP)

    DOI: 10.1093/mnras/staa728  

    ISSN:0035-8711

    eISSN:1365-2966

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    <title>ABSTRACT</title> Diverging supersonic flows are accelerating, as in the case of a de Laval nozzle, and the same concept has been applied for acceleration of magnetohydrodynamic flows in the universe. Here, we study the dynamics of ‘non-diverging’ cylindrical supersonic flows and show that they can be accelerated by effects of radiative cooling and the tangled magnetic field. In addition to radiative cooling of the jet materials (cooling effect), conversion of the ordered magnetic field into the turbulent one (conversion effect) and dissipation of the turbulent magnetic field (dissipation effect) are formulated according to our study on pulsar wind nebulae. Although each of the cooling and conversion effects is an ineffective acceleration process, the terminal velocity of magnetized cylindrical jets attains about half of the maximum possible value when the cooling, conversion, and dissipation effects work simultaneously. The radiation efficiency is also about half of the total luminosity of the jet in the case of maximal acceleration. The concept for flow acceleration by the non-ideal magnetohydrodynamic effects may be useful for studying relativistic jets in active galactic nuclei, in which the region near the jet axis is expected to be cylindrical and kink unstable.

  39. First Detection of Radio Linear Polarization in a Gamma-Ray Burst Afterglow 査読有り

    Yuji Urata, Kenji Toma, Kuiyun Huang, Keiichi Asada, Hiroshi Nagai, Satoko Takahashi, Glen Petitpas, Makoto Tashiro, Kazutaka Yamaoka

    The Astrophysical Journal 884 (2) L58-L58 2019年10月21日

    出版者・発行元: American Astronomical Society

    DOI: 10.3847/2041-8213/ab48f3  

    eISSN:2041-8213

  40. The Event Horizon General Relativistic Magnetohydrodynamic Code Comparison Project 査読有り

    Oliver Porth, Koushik Chatterjee, Ramesh Narayan, Charles F. Gammie, Yosuke Mizuno, Peter Anninos, John G. Baker, Matteo Bugli, Chi-kwan Chan, Jordy Davelaar, Luca Del Zanna, Zachariah B. Etienne, P. Chris Fragile, Bernard J. Kelly, Matthew Liska, Sera Markoff, Jonathan C. McKinney, Bhupendra Mishra, Scott C. Noble, Héctor Olivares, Ben Prather, Luciano Rezzolla, Benjamin R. Ryan, James M. Stone, Niccolò Tomei, Christopher J. White, Ziri Younsi, Event Horizon Telescope Collaboration

    The Astrophysical Journal Supplement Series 243 (2) 26-26 2019年8月1日

    出版者・発行元: American Astronomical Society

    DOI: 10.3847/1538-4365/ab29fd  

    eISSN:1538-4365

  41. ALMA Polarimetry of AT2018cow 査読有り

    K. Huang, J. Shimoda, Y. Urata, K. Toma

    Astrophysical Journal Letters 878 (1) 25 2019年6月

    DOI: 10.3847/2041-8213/ab23fd  

    ISSN:2041-8205

    eISSN:2041-8213

  42. A Mechanism for the Triple-ridge Emission Structure of AGN Jets 査読有り

    T. Ogihara, K. Takahashi, K. Toma

    Astrophysical Journal 877 19 2019年5月

  43. Hunting Axion Dark Matter with Protoplanetary Disk Polarimetry 査読有り

    Tomohiro Fujita, Ryo Tazaki, Kenji Toma

    Physical Review Letters 122 (19) 1101 2019年5月

  44. First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole 査読有り

    Event Horizon Telescope Collaboration

    Astrophysical Journal Letters 875 (1) 6 2019年4月10日

    DOI: 10.3847/2041-8213/ab0e85  

  45. First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring 査読有り

    Event Horizon Telescope Collaboration

    Astrophysical Journal Letters 875 (1) 5 2019年4月10日

    DOI: 10.3847/2041-8213/ab0f43  

  46. First M87 Event Horizon Telescope Results. III. Data Processing and Calibration 査読有り

    Event Horizon Telescope Collaboration

    Astrophysical Journal Letters 875 (1) 3 2019年4月10日

    DOI: 10.3847/2041-8213/ab0c57  

  47. First M87 Event Horizon Telescope Results. II. Array and Instrumentation 査読有り

    Event Horizon Telescope Collaboration

    Astrophysical Journal Letters 875 (1) 2 2019年4月10日

    DOI: 10.3847/2041-8213/ab0c96  

  48. First M87 Event Horizon Telescope Results. I. the Shadow of the Supermassive Black Hole 査読有り

    Event Horizon Telescope Collaboration

    Astrophysical Journal Letters 875 (1) 1 2019年4月10日

    DOI: 10.3847/2041-8213/ab0ec7  

  49. First M87 Event Horizon Telescope Results. VI. The Shadow and Mass of the Central Black Hole

    Event Horizon Telescope Collaboration, Akiyama, Kazunori, Alberdi, Antxon, Alef, Walter, Asada, Keiichi, Azulay, Rebecca, Baczko, Anne-Kathrin, Ball, David, Baloković, Mislav, Barrett, John, Bintley, Dan, Blackburn, Lindy, Boland, Wilfred, Bouman, Katherine L., Bower, Geoffrey C., Bremer, Michael, Brinkerink, Christiaan D., Brissenden, Roger, Britzen, Silke, Broderick, Avery E., Broguiere, Dominique, Bronzwaer, Thomas, Byun, Do-Young, Carlstrom, John E., Chael, Andrew, Chan, Chi-kwan, Chatterjee, Shami, Chatterjee, Koushik, Chen, Ming-Tang, Chen, Yongjun, Cho, Ilje, Christian, Pierre, Conway, John E., Cordes, James M., Crew, Geoffrey B., Cui, Yuzhu, Davelaar, Jordy, De Laurentis, Mariafelicia, Deane, Roger, Dempsey, Jessica, Desvignes, Gregory, Dexter, Jason, Doeleman, Sheperd S., Eatough, Ralph P., Falcke, Heino, Fish, Vincent L., Fomalont, Ed, Fraga-Encinas, Raquel, Friberg, Per, Fromm, Christian M., Gómez, José L., Galison, Peter, Gammie, Charles F., García, Roberto, Gentaz, Olivier, Georgiev, Boris, Goddi, Ciriaco, Gold, Roman, Gu, Minfeng, Gurwell, Mark, Hada, Kazuhiro, Hecht, Michael H., Hesper, Ronald, Ho, Luis C., Ho, Paul, Honma, Mareki, Huang, Chih-Wei L., Huang, Lei, Hughes, David H., Ikeda, Shiro, Inoue, Makoto, Issaoun, Sara, James, David J., Jannuzi, Buell T., Janssen, Michael, Jeter, Britton, Jiang, Wu, Johnson, Michael D., Jorstad, Svetlana, Jung, Taehyun, Karami, Mansour, Karuppusamy, Ramesh, Kawashima, Tomohisa, Keating, Garrett K., Kettenis, Mark, Kim, Jae-Young, Kim, Junhan, Kim, Jongsoo, Kino, Motoki, Koay, Jun Yi, Koch, Patrick M., Koyama, Shoko, Kramer, Michael, Kramer, Carsten, Krichbaum, Thomas P., Kuo, Cheng-Yu, Lauer, Tod R., Lee, Sang-Sung, Li, Yan-Rong, Li, Zhiyuan, Lindqvist, Michael, Liu, Kuo, Liuzzo, Elisabetta, Lo, Wen-Ping, Lobanov, Andrei P., Loinard, Laurent, Lonsdale, Colin, Lu, Ru-Sen, MacDonald, Nicholas R., Mao, Jirong, Markoff, Sera, Marrone, Daniel P., Marscher, Alan P., Martí-Vidal, Iván, Matsushita, Satoki, Matthews, Lynn D., Medeiros, Lia, Menten, Karl M., Mizuno, Yosuke, Mizuno, Izumi, Moran, James M., Moriyama, Kotaro, Moscibrodzka, Monika, Müller, Cornelia, Nagai, Hiroshi, Nagar, Neil M., Nakamura, Masanori, Narayan, Ramesh, Narayanan, Gopal, Natarajan, Iniyan, Neri, Roberto, Ni, Chunchong, Noutsos, Aristeidis, Okino, Hiroki, Olivares, Héctor, Oyama, Tomoaki, Özel, Feryal, Palumbo, Daniel C. M., Patel, Nimesh, Pen, Ue-Li, Pesce, Dominic W., Piétu, Vincent, Plambeck, Richard, PopStefanija, Aleksandar, Porth, Oliver, Prather, Ben, Preciado-López, Jorge A., Psaltis, Dimitrios, Pu, Hung-Yi, Ramakrishnan, Venkatessh, Rao, Ramprasad, Rawlings, Mark G., Raymond, Alexander W., Rezzolla, Luciano, Ripperda, Bart, Roelofs, Freek, Rogers, Alan, Ros, Eduardo, Rose, Mel, Roshanineshat, Arash, Rottmann, Helge, Roy, Alan L., Ruszczyk, Chet, Ryan, Benjamin R., Rygl, Kazi L. J., Sánchez, Salvador, Sánchez-Arguelles, David, Sasada, Mahito, Savolainen, Tuomas, Schloerb, F. Peter, Schuster, Karl-Friedrich, Shao, Lijing, Shen, Zhiqiang, Small, Des, Sohn, Bong Won, SooHoo, Jason, Tazaki, Fumie, Tiede, Paul, Tilanus, Remo P. J., Titus, Michael, Toma, Kenji, Torne, Pablo, Trent, Tyler, Trippe, Sascha, Tsuda, Shuichiro, van Bemmel, Ilse, van Langevelde, Huib Jan, van Rossum, Daniel R., Wagner, Jan, Wardle, John, Weintroub, Jonathan, Wex, Norbert, Wharton, Robert, Wielgus, Maciek, Wong, George N., Wu, Qingwen, Young, André, Young, Ken, Younsi, Ziri, Yuan, Feng, Yuan, Ye-Fei, Zensus, J. Anton, Zhao, Guangyao, Zhao, Shan-Shan, Zhu, Ziyan, Farah, Joseph R., Meyer-Zhao, Zheng, Michalik, Daniel, Nadolski, Andrew, Nishioka, Hiroaki, Pradel, Nicolas, Primiani, Rurik A., Souccar, Kamal, Vertatschitsch, Laura, Yamaguchi, Paul

    The Astrophysical Journal 875 (1) 2019年4月

    DOI: 10.3847/2041-8213/ab1141  

    ISSN:2041-8205

    eISSN:2041-8213

  50. Acceleration of relativistic outflows with tangled magnetic field

    Shuta J. Tanaka, Kenji Toma

    Proceedings of Science 354 2019年

    出版者・発行元: Sissa Medialab Srl

    ISSN:1824-8039

  51. The origin of polarization in kilonovae and the case of the gravitational-wave counterpart AT 2017gfo 査読有り

    Bulla, M, Covino, S, Kyutoku, K, Tanaka, M, Maund, J. R, Patat, F, Toma, K, Wiersema, K, Bruten, J, Jin, Z. P, Testa, V

    Nature Astronomy 3 99-106 2019年1月

  52. Parabolic Jets from the Spinning Black Hole in M87 査読有り

    Masanori Nakamura, Keiichi Asada, Kazuhiro Hada, Hung-Yi Pu, Scott Noble, Chihyin Tseng, Kenji Toma, Motoki Kino, Hiroshi Nagai, Kazuya Takahashi, Juan-Carlos Algaba, Monica Orienti, Kazunori Akiyama, Akihiro Doi, Gabriele Giovannini, Marcello Giroletti, Mareki Honma, Shoko Koyama, Rocco Lico, Kotaro Niinuma, Fumie Tazaki

    The Astrophysical Journal 868 (2) 146-146 2018年12月4日

    出版者・発行元: American Astronomical Society

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R., Hansen, P., Harari, D., Harrison, T. A., Harvey, V. M., Haungs, A., Hebbeker, T., Heck, D., Heimann, P., Herve, A. E., Hill, G. C., Hojvat, C., Holt, E., Homola, P., Hörandel, J. R., Horvath, P., Hrabovský, M., Huege, T., Hulsman, J., Insolia, A., Isar, P. G., Jandt, I., Johnsen, J. A., Josebachuili, M., Jurysek, J., Kääpä, A., Kampert, K. H., Keilhauer, B., Kemmerich, N., Kemp, J., Kieckhafer, R. M., Klages, H. O., Kleifges, M., Kleinfeller, J., Krause, R., Krohm, N., Kuempel, D., Kukec Mezek, G., Kunka, N., Kuotb Awad, A., Lago, B. L., LaHurd, D., Lang, R. G., Lauscher, M., Legumina, R., Leigui de Oliveira, M. A., Letessier-Selvon, A., Lhenry-Yvon, I., Link, K., Lo Presti, D., Lopes, L., López, R., López Casado, A., Lorek, R., Luce, Q., Lucero, A., Malacari, M., Mallamaci, M., Mandat, D., Mantsch, P., Mariazzi, A. G., Maris, I. C., Marsella, G., Martello, D., Martinez, H., Martínez Bravo, O., Masías Meza, J. J., Mathes, H. J., Mathys, S., Matthews, J., Matthiae, G., Mayotte, E., Mazur, P. O., Medina, C., Medina-Tanco, G., Melo, D., Menshikov, A., Merenda, K. -D., Michal, S., Micheletti, M. I., Middendorf, L., Miramonti, L., Mitrica, B., Mockler, D., Mollerach, S., Montanet, F., Morello, C., Morlino, G., Müller, A. L., Müller, G., Muller, M. A., Müller, S., Mussa, R., Naranjo, I., Nguyen, P. H., Niculescu-Oglinzanu, M., Niechciol, M., Niemietz, L., Niggemann, T., Nitz, D., Nosek, D., Novotny, V., Nožka, L., Núñez, L. A., Oikonomou, F., Olinto, A., Palatka, M., Pallotta, J., Papenbreer, P., Parente, G., Parra, A., Paul, T., Pech, M., Pedreira, F., Pȩkala, J., Peña-Rodriguez, J., Pereira, L. A. S., Perlin, M., Perrone, L., Peters, C., Petrera, S., Phuntsok, J., Pierog, T., Pimenta, M., Pirronello, V., Platino, M., Plum, M., Poh, J., Porowski, C., Prado, R. R., Privitera, P., Prouza, M., Quel, E. J., Querchfeld, S., Quinn, S., Ramos-Pollan, R., Rautenberg, J., Ravignani, D., Ridky, J., Riehn, F., Risse, M., Ristori, P., Rizi, V., Rodrigues de Carvalho, W., Rodriguez Fernandez, G., Rodriguez Rojo, J., Roncoroni, M. J., Roth, M., Roulet, E., Rovero, A. C., Ruehl, P., Saffi, S. J., Saftoiu, A., Salamida, F., Salazar, H., Saleh, A., Salina, G., Sánchez, F., Sanchez-Lucas, P., Santos, E. M., Santos, E., Sarazin, F., Sarmento, R., Sarmiento-Cano, C., Sato, R., Schauer, M., Scherini, V., Schieler, H., Schimp, M., Schmidt, D., Scholten, O., Schovánek, P., Schröder, F. G., Schröder, S., Schulz, A., Schumacher, J., Sciutto, S. J., Segreto, A., Shadkam, A., Shellard, R. C., Sigl, G., Silli, G., Šmída, R., Snow, G. R., Sommers, P., Sonntag, S., Soriano, J. F., Squartini, R., Stanca, D., Stanič, S., Stasielak, J., Stassi, P., Stolpovskiy, M., Strafella, F., Streich, A., Suarez, F., Suarez-Durán, M., Sudholz, T., Suomijärvi, T., Supanitsky, A. D., Šupík, J., Swain, J., Szadkowski, Z., Taboada, A., Taborda, O. A., Timmermans, C., Todero Peixoto, C. J., Tomankova, L., Tomé, B., Torralba Elipe, G., Travnicek, P., Trini, M., Tueros, M., Ulrich, R., Unger, M., Urban, M., Valdés Galicia, J. F., Valiño, I., Valore, L., van Aar, G., van Bodegom, P., van den Berg, A. M., van Vliet, A., Varela, E., Vargas Cárdenas, B., Vázquez, R. A., Veberič, D., Ventura, C., Vergara Quispe, I. D., Verzi, V., Vicha, J., Villaseñor, L., Vorobiov, S., Wahlberg, H., Wainberg, O., Walz, D., Watson, A. A., Weber, M., Weindl, A., Wiedeński, M., Wiencke, L., Wilczyński, H., Wirtz, M., Wittkowski, D., Wundheiler, B., Yang, L., Yushkov, A., Zas, E., Zavrtanik, D., Zavrtanik, M., Zepeda, A., Zimmermann, B., Ziolkowski, M., Zong, Z., Zuccarello, F., Pierre Auger Collaboration, Kim, S., Schulze, S., Bauer, F. E., Corral-Santana, J. M., de Gregorio-Monsalvo, I., González-López, J., Hartmann, D. H., Ishwara-Chandra, C. H., Martín, S., Mehner, A., Misra, K., Michałowski, M. J., Resmi, L., ALMA Collaboration, Paragi, Z., Agudo, I., An, T., Beswick, R., Casadio, C., Frey, S., Jonker, P., Kettenis, M., Marcote, B., Moldon, J., Szomoru, A., van Langevelde, H. J., Yang, J., Euro VLBI Team, Cwiek, A., Cwiok, M., Czyrkowski, H., Dabrowski, R., Kasprowicz, G., Mankiewicz, L., Nawrocki, K., Opiela, R., Piotrowski, L. W., Wrochna, G., Zaremba, M., Żarnecki, A. F., Pi of the Sky Collaboration, Haggard, D., Nynka, M., Ruan, J. J., Chandra Team at McGill University, Bland, P. A., Booler, T., Devillepoix, H. A. R., de Gois, J. S., Hancock, P. J., Howie, R. M., Paxman, J., Sansom, E. K., Towner, M. C., Desert Fireball Network, DFN:, Tonry, J., Coughlin, M., Stubbs, C. W., Denneau, L., Heinze, A., Stalder, B., Weiland, H., ATLAS, Eatough, R. P., Kramer, M., Kraus, A., Time Resolution Universe Survey, High, Troja, E., Piro, L., Becerra González, J., Butler, N. R., Fox, O. D., Khandrika, H. G., Kutyrev, A., Lee, W. H., Ricci, R., Ryan, R. E., Jr., Sánchez-Ramírez, R., Veilleux, S., Watson, A. M., Wieringa, M. H., Burgess, J. M., van Eerten, H., Fontes, C. J., Fryer, C. L., Korobkin, O., Wollaeger, R. T., RIMAS, RATIR, Camilo, F., Foley, A. R., Goedhart, S., Makhathini, S., Oozeer, N., Smirnov, O. M., Fender, R. P., Woudt, P. A., South Africa/MeerKAT, SKA

    The Astrophysical Journal 848 12 2017年10月

    DOI: 10.3847/2041-8213/aa91c9  

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    On 2017 August 17 a binary neutron star coalescence candidate (later designated GW170817) with merger time 12:41:04 UTC was observed through gravitational waves by the Advanced LIGO and Advanced Virgo detectors. The Fermi Gamma-ray Burst Monitor independently detected a gamma-ray burst (GRB 170817A) with a time delay of ̃ 1.7 { { s } } with respect to the merger time. From the gravitational-wave signal, the source was initially localized to a sky region of 31 deg2 at a luminosity distance of {40}-8+8 Mpc and with component masses consistent with neutron stars. The component masses were later measured to be in the range 0.86 to 2.26 {M}. An extensive observing campaign was launched across the electromagnetic spectrum leading to the discovery of a bright optical transient (SSS17a, now with the IAU identification of AT 2017gfo) in NGC 4993 (at ̃ 40 { { Mpc } }) less than 11 hours after the merger by the One-Meter, Two Hemisphere (1M2H) team using the 1 m Swope Telescope. The optical transient was independently detected by multiple teams within an hour. Subsequent observations targeted the object and its environment. Early ultraviolet observations revealed a blue transient that faded within 48 hours. Optical and infrared observations showed a redward evolution over ̃10 days. Following early non-detections, X-ray and radio emission were discovered at the transient's position ̃ 9 and ̃ 16 days, respectively, after the merger. Both the X-ray and radio emission likely arise from a physical process that is distinct from the one that generates the UV/optical/near-infrared emission. No ultra-high-energy gamma-rays and no neutrino candidates consistent with the source were found in follow-up searches. These observations support the hypothesis that GW170817 was produced by the merger of two neutron stars in NGC 4993 followed by a short gamma-ray burst (GRB 170817A) and a kilonova/macronova powered by the radioactive decay of r-process nuclei synthesized in the ejecta. <P />Any correspondence should be addressed to ....

  58. Rayleigh-Taylor Instability in Two-Component Relativistic Jets 査読有り

    Kenji Toma, Serguei S. Komissarov, Oliver Porth

    Monthly Notices of the Royal Astronomical Society 472 1253-1258 2017年7月14日

  59. 国際宇宙ステーション搭載用LargE Area burst Polarimeter:LEAP計画の現状

    郡司 修一, 林田 清, 岸本 俊二, 米徳 大輔, 當真 賢二, 高橋 弘充, 谷津 陽一, 坂本 貴紀, 岸本 祐二, 斎藤 芳隆, 老川 由馬, 高倉 美華, 上田 達也, 中森 健之, 斎藤 耀, 原 嘉孝, 稲田 海斗, 三原 建弘

    日本物理学会講演概要集 72 506-506 2017年

    出版者・発行元: 一般社団法人 日本物理学会

    DOI: 10.11316/jpsgaiyo.72.1.0_506  

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    <p>ガンマ線バーストの発見から50年が経過するが、未だその放射メカニズムが明らかにされていない。数多くのガンマ線バーストに対して偏光観測を行う事で、その解明を目指すプロジェクトがLEAPである。LEAPはアメリカと日本の国際共同プロジェクトであり、2016年末にNASA本部にプロポーザルを提出した。また日本でもJAXAの中にワーキンググループが設置されている。本講演では、その物理的な意義、検出器の概要と性能を紹介する。</p>

  60. Evolution of an accretion disc in binary black hole systems 査読有り

    Shigeo S. Kimura, Sanemichi Z. Takahashi, Kenji Toma

    Monthly Notices of the Royal Astronomical Society 465 (4) 4406-4413 2017年

    出版者・発行元: Oxford University Press

    DOI: 10.1093/mnras/stw3036  

    ISSN:1365-2966 0035-8711

  61. Gamma-Ray Bursts and Population III Stars 招待有り 査読有り

    Kenji Toma, Sung-Chul Yoon, Volker Bromm

    SPACE SCIENCE REVIEWS 202 (1-4) 159-180 2016年12月

    DOI: 10.1007/s11214-016-0250-7  

    ISSN:0038-6308

    eISSN:1572-9672

  62. Causal production of the electromagnetic energy flux and role of the negative energies in the Blandford-Znajek process 査読有り

    Kenji Toma, Fumio Takahara

    PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS 2016 (6) 3E01 2016年6月

    DOI: 10.1093/ptep/ptw081  

    ISSN:2050-3911

  63. STOCHASTIC PARTICLE ACCELERATION IN TURBULENCE GENERATED BY MAGNETOROTATIONAL INSTABILITY 査読有り

    Shigeo S. Kimura, Kenji Toma, Takeru K. Suzuki, Shu-ichiro Inutsuka

    ASTROPHYSICAL JOURNAL 822 (2) 88 2016年5月

    DOI: 10.3847/0004-637X/822/2/88  

    ISSN:0004-637X

    eISSN:1538-4357

  64. X-ray polarimetry with the Polarization Spectroscopic Telescope Array (PolSTAR) 査読有り

    Henric S. Krawczynski, Daniel Stern, Fiona A. Harrison, Fabian F. Kislat, Anna Zajczyk, Matthias Beilicke, Janie Hoormann, Qingzhen Guo, Ryan Endsley, Adam R. Ingram, Hiromasa Miyasaka, Kristin K. Madsen, Kim M. Aaron, Rashied Amini, Matthew G. Baring, Banafsheh Beheshtipour, Arash Bodaghee, Jeffrey Booth, Chester Borden, Markus Boettcher, Finn E. Christensen, Paolo S. Coppi, Ramanath Cowsik, Shane Davis, Jason Dexter, Chris Done, Luis A. Dominguez, Don Ellison, Robin J. English, Andrew C. Fabian, Abe Falcone, Jeffrey A. Favretto, Rodrigo Fernandez, Paolo Giommi, Brian W. Grefenstette, Erin Kara, Chung H. Lee, Maxim Lyutikov, Thomas Maccarone, Hironori Matsumoto, Jonathan McKinney, Tatehiro Mihara, Jon M. Miller, Ramesh Narayan, Lorenzo Natalucci, Feryal Oezel, Michael J. Pivovaroff, Steven Pravdo, Dimitrios Psaltis, Takashi Okajima, Kenji Toma, William W. Zhang

    ASTROPARTICLE PHYSICS 75 8-28 2016年2月

    DOI: 10.1016/j.astropartphys.2015.10.009  

    ISSN:0927-6505

    eISSN:1873-2852

  65. 21pCD-4 ISS搭載用GRB偏光度検出器LEAPのエンジニアリングモデル設計

    高倉 美華, Wilson-Hodge Colleen, McConnell Mark, Bloser Peter, Legere Jason, Preece Robert D., 米徳 大輔, 三原 建弘, 林田 清, 岸本 祐二, 高橋 弘充, 郡司 修一, 谷津 陽一, 當真 賢治, 中森 健之, 岸川 達哉, 老川 由馬, 上田 達也, Gaskin Jessica, Daigle Stephen, Ramsey Brian

    日本物理学会講演概要集 71 504-504 2016年

    出版者・発行元: 一般社団法人 日本物理学会

    DOI: 10.11316/jpsgaiyo.71.1.0_504  

  66. 19aAT-4 Blandford-Znajek過程における負のエネルギーの役割

    當真 賢二, 高原 文郎

    日本物理学会講演概要集 71 455-455 2016年

    出版者・発行元: 一般社団法人日本物理学会

    DOI: 10.11316/jpsgaiyo.71.1.0_455  

    ISSN:2189-079X

  67. 19aAZ-13 活動銀河核の高温降着円盤内における乱流加速

    木村 成生, 當真 賢二, 鈴木 建, 犬塚 修一郎

    日本物理学会講演概要集 71 463-463 2016年

    出版者・発行元: 一般社団法人日本物理学会

    DOI: 10.11316/jpsgaiyo.71.1.0_463  

    ISSN:2189-079X

  68. ISS搭載用GRB偏光度検出器LEAPにおけるエンジニアリングモデルの回路開発の現状

    高倉 美華, 郡司 修一, 中森 健之, 老川 由馬, 上田 達也, Gaskin Jessica, Daigle Stephen, Ramsey Brian, Wilson-Hodge Colleen, McConnell Mark, Bloser Peter, Legere Jason, Preece Robert D., 米徳 大輔, 三原 建弘, 林田 清, 岸本 祐二, 岸本 俊二, 高橋 弘充, 谷津 陽一, 當真 賢ニ, 坂本 貴教

    日本物理学会講演概要集 71 353-353 2016年

    出版者・発行元: 一般社団法人 日本物理学会

    DOI: 10.11316/jpsgaiyo.71.2.0_353  

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    <p>ガンマ線バーストのエネルギー輻射メカニズムの解明には偏光観測が大きな鍵を握っている。そこで、今までに無い大面積で高性能の検出器をISSに設置して観測する計画(LEAP)を進めている。今年度から、検出器1モジュール分であるエンジニアリングモデル(EM)検出器の製作を行っている。今回の講演では、そのEM検出器のコンセプトと、検出器の筐体、回路部分などの開発現状について説明する。</p>

  69. Evaluation of a Bread Board Model Gamma-ray Burst Polarimeter toward installation on the International Space Station

    Yuma Oikawa, Shuichi Gunji, Takeshi Nakamori, Mika Takakura, Tatsuya Ueda, Tatsuya Kishikawa, Stephen Daigle, Jessica Gaskin, Brian Ramsey, Colleen Wilson-Hodge, Robert D. Preece, Mark McConnell, Peter Bloser, Jason Legere, Daisuke Yonetoku, Tatehiro Mihara, Kiyoshi Hayashida, Yuji Kishimoto, Shunji Kishimoto, Hiromitsu Takahashi, Yoichi Yatsu, Kenji Toma, Takanori Sakamoto

    2016 IEEE NUCLEAR SCIENCE SYMPOSIUM, MEDICAL IMAGING CONFERENCE AND ROOM-TEMPERATURE SEMICONDUCTOR DETECTOR WORKSHOP (NSS/MIC/RTSD) 2016年

    ISSN:1095-7863

  70. NEUTRINO AND COSMIC-RAY EMISSION AND CUMULATIVE BACKGROUND FROM RADIATIVELY INEFFICIENT ACCRETION FLOWS IN LOW-LUMINOSITY ACTIVE GALACTIC NUCLEI 査読有り

    Shigeo S. Kimura, Kohta Murase, Kenji Toma

    ASTROPHYSICAL JOURNAL 806 (2) 159-173 2015年6月

    DOI: 10.1088/0004-637X/806/2/159  

    ISSN:0004-637X

    eISSN:1538-4357

  71. Synchrotron self-Compton emission by relativistic electrons under stochastic acceleration: application to Mrk 421 and Mrk 501 査読有り

    Jun Kakuwa, Kenji Toma, Katsuaki Asano, Masaaki Kusunose, Fumio Takahara

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 449 (1) 551-558 2015年5月

    DOI: 10.1093/mnras/stv281  

    ISSN:0035-8711

    eISSN:1365-2966

  72. 25aSJ-8 ISS搭載用GRB偏光度検出器における緩衝材の選定と振動試験結果

    老川 由馬, Wilson-Hodge Colleen, Preece Robert D., 米徳 大輔, 三原 建弘, 林田 清, 岸本 祐二, 高橋 弘充, 谷津 陽一, 當真 賢二, 郡司 修一, 中森 健之, 岸川 達哉, 高倉 美華, 上田 達也, Gaskin Jessica, Daigle Stephen, Ramsey Brian

    日本物理学会講演概要集 70 341-341 2015年

    出版者・発行元: 一般社団法人 日本物理学会

    DOI: 10.11316/jpsgaiyo.70.2.0_341  

  73. 24aDJ-4 小型衛星搭載用GRB偏光度検出器の開発と性能評価試験

    岸川 達哉, 郡司 修一, 中森 健之, 片桐 惇, 老川 由馬, 上田 達也, 高倉 美華, Ramsey Brian, Gaskin Jessica, Wilson-Hodge Colleen, Daigle Stephen, 米徳 大輔, 三原 建弘, 林田 清, 岸本 祐二, 斎藤 芳隆, 高橋 弘充, 水野 恒史, 谷津 陽一, 當真 賢二

    日本物理学会講演概要集 70 496-496 2015年

    出版者・発行元: 一般社団法人日本物理学会

    DOI: 10.11316/jpsgaiyo.70.1.0_496  

    ISSN:2189-079X

  74. Electromotive force in the Blandford-Znajek process 査読有り

    Kenji Toma, Fumio Takahara

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 442 (4) 2855-2866 2014年8月

    DOI: 10.1093/mnras/stu1053  

    ISSN:0035-8711

    eISSN:1365-2966

  75. EFFECTS OF HIGH-ENERGY PARTICLES ON ACCRETION FLOWS ONTO A SUPERMASSIVE BLACK HOLE 査読有り

    Shigeo S. Kimura, Kenji Toma, Fumio Takahara

    ASTROPHYSICAL JOURNAL 791 (2) 2014年8月

    DOI: 10.1088/0004-637X/791/2/100  

    ISSN:0004-637X

    eISSN:1538-4357

  76. Circular polarization in the optical afterglow of GRB 121024A 査読有り

    K. Wiersema, S. Covino, K. Toma, A. J. van der Horst, K. Varela, M. Min, J. Greiner, R. L. C. Starling, N. R. Tanvir, R. A. M. J. Wijers, S. Campana, P. A. Curran, Y. Fan, J. P. U. Fynbo, J. Gorosabel, A. Gomboc, D. Goetz, J. Hjorth, Z. P. Jin, S. Kobayashi, C. Kouveliotou, C. Mundell, P. T. O'Brien, E. Pian, A. Rowlinson, D. M. Russell, R. Salvaterra, S. di Serego Alighieri, G. Tagliaferri, S. D. Vergani, J. Elliott, C. Farina, O. E. Hartoog, R. Karjalainen, S. Klose, F. Knust, A. J. Levan, P. Schady, V. Sudilovsky, R. Willingale

    NATURE 509 (7499) 201-+ 2014年5月

    DOI: 10.1038/nature13237  

    ISSN:0028-0836

    eISSN:1476-4687

  77. POET: A SMEX mission for gamma ray burst polarimetry

    Mark L. McConnell, Matthew Baring, Peter Bloser, Joseph F. Dwyer, A. Gordon Emslie, Camden D. Ertley, Jochen Greiner, Alice K. Harding, Dieter H. Hartmann, Joanne E. Hill, Philip Kaaret, R. M. Kippen, David Mattingly, Sheila McBreen, Mark Pearce, Nicolas Produit, James M. Ryan, Felix Ryde, Takanori Sakamoto, Kenji Toma, W. Thomas Vestrand, Bing Zhang

    Proceedings of SPIE - The International Society for Optical Engineering 9144 2014年

    出版者・発行元: SPIE

    DOI: 10.1117/12.2056905  

    ISSN:1996-756X 0277-786X

  78. X-ray gamma-ray Polarimetry Small Satellite PolariS

    Kiyoshi Hayashida, Daisuke Yonetoku, Shuichi Gunji, Toru Tamagawa, Tatehiro Mihara, Tsunefumi Mizuno, Hiromitsu Takahashi, Tadayasu Dotani, Hidetoshi Kubo, Yoichi Yatsu, Fuyuki Tokanai, Takeshi Nakamori, Shinpei Shibata, Asami Hayato, Akihiro Furuzawa, Yuji Kishimoto, Shunji Kitamoto, Kenji Toma, Masaaki Sadamoto, Keigo Yoshinaga, Kim Juyong, Shunichiro Ide, Fumiyoshi Kamitsukasa, Naohisa Anabuki, Hiroshi Tsunemi, Jun Katagiri, Juri Sugimoto

    SPACE TELESCOPES AND INSTRUMENTATION 2014: ULTRAVIOLET TO GAMMA RAY 9144 91440K 2014年

    DOI: 10.1117/12.2056685  

    ISSN:0277-786X

  79. TIME-DEPENDENT MODELS FOR BLAZAR EMISSION WITH THE SECOND-ORDER FERMI ACCELERATION 査読有り

    Katsuaki Asano, Fumio Takahara, Masaaki Kusunose, Kenji Toma, Jun Kakuwa

    ASTROPHYSICAL JOURNAL 780 (1) 64 2014年1月

    DOI: 10.1088/0004-637X/780/1/64  

    ISSN:0004-637X

    eISSN:1538-4357

  80. Polarization of GRB Prompt Emission 招待有り 査読有り

    Kenji Toma

    eConf Proceedings C1304143 45 2013年8月

  81. Efficient acceleration of relativistic magnetohydrodynamic jets 査読有り

    Kenji Toma, Fumio Takahara

    PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS (8) 2013年8月

    DOI: 10.1093/ptep/ptt058  

    ISSN:2050-3911

  82. Gamma-ray burst science in the era of the Cherenkov Telescope Array 査読有り

    Susumu Inoue, Jonathan Granot, Paul T. O'Brien, Katsuaki Asano, Aurelien Bouvier, Alessandro Carosi, Valerie Connaughton, Markus Garczarczyk, Rudy Gilmore, Jim Hinton, Yoshiyuki Inoue, Kunihito Ioka, Jun Kakuwa, Sera Markoff, Kohta Murase, Julian P. Osborne, A. Nepomuk Otte, Rhaana Starling, Hiroyasu Tajima, Masahiro Teshima, Kenji Toma, Stefan Wagner, Ralph A. M. J. Wijers, David A. Williams, Tokonatsu Yamamoto, Ryo Yamazaki

    ASTROPARTICLE PHYSICS 43 252-275 2013年3月

    DOI: 10.1016/j.astropartphys.2013.01.004  

    ISSN:0927-6505

    eISSN:1873-2852

  83. Strict Limit on CPT Violation from Polarization of gamma-Ray Bursts 査読有り

    Kenji Toma, Shinji Mukohyama, Daisuke Yonetoku, Toshio Murakami, Shuichi Gunji, Tatehiro Mihara, Yoshiyuki Morihara, Tomonori Sakashita, Takuya Takahashi, Yudai Wakashima, Hajime Yonemochi, Noriyuki Toukairin

    PHYSICAL REVIEW LETTERS 109 (24) 1104 2012年12月

    DOI: 10.1103/PhysRevLett.109.241104  

    ISSN:0031-9007

  84. MAGNETIC STRUCTURES IN GAMMA-RAY BURST JETS PROBED BY GAMMA-RAY POLARIZATION 査読有り

    Daisuke Yonetoku, Toshio Murakami, Shuichi Gunji, Tatehiro Mihara, Kenji Toma, Yoshiyuki Morihara, Takuya Takahashi, Yudai Wakashima, Hajime Yonemochi, Tomonori Sakashita, Noriyuki Toukairin, Hirofumi Fujimoto, Yoshiki Kodama

    ASTROPHYSICAL JOURNAL LETTERS 758 (1) 1 2012年10月

    DOI: 10.1088/2041-8205/758/1/L1  

    ISSN:2041-8205

    eISSN:2041-8213

  85. Prospects for detecting gamma-ray bursts at very high energies with the Cherenkov Telescope Array 査読有り

    Jun Kakuwa, Kohta Murase, Kenji Toma, Susumu Inoue, Ryo Yamazaki, Kunihito Ioka

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 425 (1) 514-526 2012年9月

    DOI: 10.1111/j.1365-2966.2012.21490.x  

    ISSN:0035-8711

    eISSN:1365-2966

  86. BARYON LOADING OF ACTIVE GALACTIC NUCLEUS JETS MEDIATED BY NEUTRONS 査読有り

    K. Toma, F. Takahara

    ASTROPHYSICAL JOURNAL 754 (2) 148-154 2012年8月

    DOI: 10.1088/0004-637X/754/2/148  

    ISSN:0004-637X

  87. GRB 091208B: FIRST DETECTION OF THE OPTICAL POLARIZATION IN EARLY FORWARD SHOCK EMISSION OF A GAMMA-RAY BURST AFTERGLOW 査読有り

    T. Uehara, K. Toma, K. S. Kawabata, S. Chiyonobu, Y. Fukazawa, Y. Ikejiri, T. Inoue, R. Itoh, T. Komatsu, H. Miyamoto, T. Mizuno, O. Nagae, H. Nakaya, T. Ohsugi, K. Sakimoto, M. Sasada, H. Tanaka, M. Uemura, M. Yamanaka, T. Yamashita, R. Yamazaki, M. Yoshida

    ASTROPHYSICAL JOURNAL LETTERS 752 (1) 6 2012年6月

    DOI: 10.1088/2041-8205/752/1/L6  

    ISSN:2041-8205

  88. Study of emission mechanism of Gamma-Ray Bursts by the gamma-ray polarization with IKAROS-GAP

    Daisuke Yonetoku, Toshio Murakami, Shuichi Gunji, Tatehiro Mihara, Kenji Toma

    Proceedings of Science 2012- 2012年

    出版者・発行元: Sissa Medialab Srl

    ISSN:1824-8039

  89. Population III gamma-ray bursts

    K. Toma, T. Sakamoto, P. Mészáros

    Memorie della Societa Astronomica Italiana, Supplementi - Journal of the Italian Astronomical Society, Supplement 21 76-81 2012年

    出版者・発行元: Societa Astronomica Italiana

    ISSN:1824-0178

  90. Study of emission mechanism of GRBs probed by the gamma-ray polarization with IKAROS-GAP 査読有り

    Daisuke Yonetoku, Toshio Murakami, Tomonori Sakashita, Yoshiyuki Morihara, Shuichi Gunji, Tatehiro Mihara, Kenji Toma

    DEATH OF MASSIVE STARS: SUPERNOVAE AND GAMMA-RAY BURSTS (279) 425-426 2012年

    DOI: 10.1017/S174392131201366X  

    ISSN:1743-9213

  91. DETECTION OF GAMMA-RAY POLARIZATION IN PROMPT EMISSION OF GRB 100826A 査読有り

    Daisuke Yonetoku, Toshio Murakami, Shuichi Gunji, Tatehiro Mihara, Kenji Toma, Tomonori Sakashita, Yoshiyuki Morihara, Takuya Takahashi, Noriyuki Toukairin, Hirofumi Fujimoto, Yoshiki Kodama, Shin Kubo

    ASTROPHYSICAL JOURNAL LETTERS 743 (2) 30 2011年12月

    DOI: 10.1088/2041-8205/743/2/L30  

    ISSN:2041-8205

  92. Photosphere-internal shock model of gamma-ray bursts: case studies of Fermi/LAT bursts 査読有り

    K. Toma, X. -F. Wu, P. Meszaros

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 415 (2) 1663-1680 2011年8月

    DOI: 10.1111/j.1365-2966.2011.18807.x  

    ISSN:0035-8711

    eISSN:1365-2966

  93. A PHOTOMETRIC REDSHIFT OF z similar to 9.4 FOR GRB 090429B 査読有り

    A. Cucchiara, A. J. Levan, D. B. Fox, N. R. Tanvir, T. N. Ukwatta, E. Berger, T. Kruehler, A. Kuepcue Yoldas, X. F. Wu, K. Toma, J. Greiner, F. Olivares E, A. Rowlinson, L. Amati, T. Sakamoto, K. Roth, A. Stephens, Alexander Fritz, J. P. U. Fynbo, J. Hjorth, D. Malesani, P. Jakobsson, K. Wiersema, P. T. O'Brien, A. M. Soderberg, R. J. Foley, A. S. Fruchter, J. Rhoads, R. E. Rutledge, B. P. Schmidt, M. A. Dopita, P. Podsiadlowski, R. Willingale, C. Wolf, S. R. Kulkarni, P. D'Avanzo

    ASTROPHYSICAL JOURNAL 736 (1) 7 2011年7月

    DOI: 10.1088/0004-637X/736/1/7  

    ISSN:0004-637X

  94. ON THE IMPLICATIONS OF LATE INTERNAL DISSIPATION FOR SHALLOW-DECAY AFTERGLOW EMISSION AND ASSOCIATED HIGH-ENERGY GAMMA-RAY SIGNALS 査読有り

    Kohta Murase, Kenji Toma, Ryo Yamazaki, Peter Meszaros

    ASTROPHYSICAL JOURNAL 732 (2) 77 2011年5月

    DOI: 10.1088/0004-637X/732/2/77  

    ISSN:0004-637X

    eISSN:1538-4357

  95. ON THE HIGH-ENERGY EMISSION OF THE SHORT GRB 090510 査読有り

    Hao-Ning He, Xue-Feng Wu, Kenji Toma, Xiang-Yu Wang, Peter Meszaros

    ASTROPHYSICAL JOURNAL 733 (1) 22-32 2011年5月

    DOI: 10.1088/0004-637X/733/1/22  

    ISSN:0004-637X

  96. High energy neutrino emission from the earliest gamma-ray bursts 査読有り

    Shan Gao, Kenji Toma, Peter Meszaros

    PHYSICAL REVIEW D 83 (10) 3004 2011年5月

    DOI: 10.1103/PhysRevD.83.103004  

    ISSN:2470-0010

    eISSN:2470-0029

  97. POPULATION III GAMMA-RAY BURST AFTERGLOWS: CONSTRAINTS ON STELLAR MASSES AND EXTERNAL MEDIUM DENSITIES 査読有り

    Kenji Toma, Takanori Sakamoto, Peter Meszaros

    ASTROPHYSICAL JOURNAL 731 (2) 127-142 2011年4月

    DOI: 10.1088/0004-637X/731/2/127  

    ISSN:0004-637X

  98. DETECTION OF A SPECTRAL BREAK IN THE EXTRA HARD COMPONENT OF GRB 090926A 査読有り

    M. Ackermann, M. Ajello, K. Asano, M. Axelsson, L. Baldini, J. Ballet, G. Barbiellini, M. G. Baring, D. Bastieri, K. Bechtol, R. Bellazzini, B. Berenji, P. N. Bhat, E. Bissaldi, R. D. Blandford, E. Bonamente, A. W. Borgland, A. Bouvier, J. Bregeon, A. Brez, M. S. Briggs, M. Brigida, P. Bruel, R. Buehler, S. Buson, G. A. Caliandro, R. A. Cameron, P. A. Caraveo, S. Carrigan, J. M. Casandjian, C. Cecchi, O. Celik, V. Chaplin, E. Charles, A. Chekhtman, J. Chiang, S. Ciprini, R. Claus, J. Cohen-Tanugi, V. Connaughton, J. Conrad, S. Cutini, C. D. Dermer, A. De Angelis, F. De Palma, B. L. Dingus, E. Do Couto E. Silva, P. S. Drell, R. Dubois, C. Favuzzi, S. J. Fegan, E. C. Ferrara, W. B. Focke, M. Frailis, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, N. Gehrels, S. Germani, N. Giglietto, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, A. Goldstein, J. Granot, J. Greiner, I. A. Grenier, J. E. Grove, S. Guiriec, D. Hadasch, Y. Hanabata, A. K. Harding, K. Hayashi, M. Hayashida, E. Hays, D. Horan, R. E. Hughes, R. Itoh, G. Johannesson, A. S. Johnson, W. N. Johnson, T. Kamae, H. Katagiri, J. Kataoka, R. M. Kippen, J. Knoedlseder, D. Kocevski, C. Kouveliotou, M. Kuss, J. Lande, L. Latronico, S. -H. Lee, M. Llena Garde, F. Longo, F. Loparco, M. N. Lovellette, P. Lubrano, A. Makeev, M. N. Mazziotta, S. McBreen, J. E. McEnery, S. McGlynn, C. Meegan, J. Mehault, P. Meszaros, P. F. Michelson, T. Mizuno, C. Monte, M. E. Monzani, E. Moretti, A. Morselli, I. V. Moskalenko, S. Murgia, H. Nakajima, T. Nakamori, M. Naumann-Godo, S. Nishino, P. L. Nolan, J. P. Norris, E. Nuss, M. Ohno, T. Ohsugi, A. Okumura, N. Omodei, E. Orlando, J. F. Ormes, M. Ozaki, W. S. Paciesas, D. Paneque, J. H. Panetta, D. Parent, V. Pelassa, M. Pepe, M. Pesce-Rollins, V. Petrosian, F. Piron, T. A. Porter, R. Preece, J. L. Racusin, S. Raino, R. Rando, A. Rau, M. Razzano, S. Razzaque, A. Reimer, O. Reimer, T. Reposeur, L. C. Reyes, J. Ripken, S. Ritz, M. Roth, F. Ryde, H. F. -W. Sadrozinski, A. Sander, J. D. Scargle, M. S. Strickman, D. J. Suson, H. Tajima, H. Takahashi, T. Tanaka, Y. Tanaka, J. B. Thayer, J. G. Thayer, L. Tibaldo, D. Tierney, K. Toma, D. F. Torres, G. Tosti, A. Tramacere, Y. Uchiyama, T. Uehara, T. L. Usher, J. Vandenbroucke, A. J. van der Horst, V. Vasileiou, N. Vilchez, V. Vitale, A. von Kienlin, A. P. Waite, P. Wang, C. Wilson-Hodge, B. L. Winer, K. S. Wood, X. F. Wu, R. Yamazaki, Z. Yang, T. Ylinen, M. Ziegler

    ASTROPHYSICAL JOURNAL 729 (2) 114 2011年3月

    DOI: 10.1088/0004-637X/729/2/114  

    ISSN:0004-637X

    eISSN:1538-4357

  99. Time-Resolved Spectral Variability of the Prompt Emission from GRB 070125 Observed with Suzaku/WAM 査読有り

    Onda Kaori, Tashiro Makoto S, Nakagawa Yujin E, Yamaoka Kazutaka, Terada Yukikatsu, Ohno Masanori, Sugita Satoshi, Sakamoto Takanori, Toma Kenji, Gandhi Poshak, Kodaka Natsuki, Iwakiri Wataru, Urata Yuji, Yamauchi Makoto, Fukazawa Yasushi

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 62 (3) 547-556 2010年6月25日

    DOI: 10.1093/pasj/62.3.547  

    ISSN:0004-6264

    eISSN:2053-051X

  100. SWIFT AND FERMI OBSERVATIONS OF THE EARLY AFTERGLOW OF THE SHORT GAMMA-RAY BURST 090510 査読有り

    M. De Pasquale, P. Schady, N. P. M. Kuin, M. J. Page, P. A. Curran, S. Zane, S. R. Oates, S. T. Holland, A. A. Breeveld, E. A. Hoversten, G. Chincarini, D. Grupe, A. A. Abdo, M. Ackermann, M. Ajello, M. Axelsson, L. Baldini, J. Ballet, G. Barbiellini, M. G. Baring, D. Bastieri, K. Bechtol, R. Bellazzini, B. Berenji, E. Bissaldi, R. D. Blandford, E. D. Bloom, E. Bonamente, A. W. Borgland, A. Bouvier, J. Bregeon, A. Brez, M. S. Briggs, M. Brigida, P. Bruel, T. H. Burnett, S. Buson, G. A. Caliandro, R. A. Cameron, P. A. Caraveo, S. Carrigan, J. M. Casandjian, C. Cecchi, Oe. Celik, A. Chekhtman, J. Chiang, S. Ciprini, R. Claus, J. Cohen-Tanugi, V. Connaughton, J. Conrad, C. D. Dermer, A. de Angelis, F. de Palma, B. L. Dingus, E. do Couto e Silva, P. S. Drell, R. Dubois, D. Dumora, C. Farnier, C. Favuzzi, S. J. Fegan, G. Fishman, W. B. Focke, M. Frailis, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, N. Gehrels, S. Germani, N. Giglietto, F. Giordano, T. Glanzman, G. Godfrey, J. Granot, J. Greiner, I. A. Grenier, J. E. Grove, L. Guillemot, S. Guiriec, A. K. Harding, M. Hayashida, E. Hays, D. Horan, R. E. Hughes, M. S. Jackson, G. Johannesson, A. S. Johnson, W. N. Johnson, T. Kamae, H. Katagiri, J. Kataoka, N. Kawai, M. Kerr, R. M. Kippen, J. Knoedlseder, D. Kocevski, M. Kuss, J. Lande, L. Latronico, M. Lemoine-Goumard, F. Longo, F. Loparco, B. Lott, M. N. Lovellette, P. Lubrano, A. Makeev, M. N. Mazziotta, J. E. McEnery, S. McGlynn, C. Meegan, P. Meszaros, C. Meurer, P. F. Michelson, W. Mitthumsiri, T. Mizuno, C. Monte, M. E. Monzani, E. Moretti, A. Morselli, I. V. Moskalenko, S. Murgia, P. L. Nolan, J. P. Norris, E. Nuss, M. Ohno, T. Ohsugi, N. Omodei, E. Orlando, J. F. Ormes, W. S. Paciesas, D. Paneque, J. H. Panetta, D. Parent, V. Pelassa, M. Pepe, M. Pesce-Rollins, F. Piron, T. A. Porter, R. Preece, S. Raino, R. Rando, M. Razzano, A. Reimer, O. Reimer, T. Reposeur, S. Ritz, L. S. Rochester, A. Y. Rodriguez, M. Roth, F. Ryde, H. F. -W. Sadrozinski, A. Sander, P. M. Saz Parkinson, J. D. Scargle, T. L. Schalk, C. Sgro, E. J. Siskind, P. D. Smith, G. Spandre, P. Spinelli, M. Stamatikos, J. -L. Starck, F. W. Stecker, M. S. Strickman, D. J. Suson, H. Tajima, H. Takahashi, T. Tanaka, J. B. Thayer, J. G. Thayer, D. J. Thompson, L. Tibaldo, K. Toma, D. F. Torres, G. Tosti, A. Tramacere, Y. Uchiyama, T. Uehara, T. L. Usher, A. J. van der Horst, V. Vasileiou, N. Vilchez, V. Vitale, A. von Kienlin, A. P. Waite, P. Wang, B. L. Winer, K. S. Wood, X. F. Wu, R. Yamazaki, T. Ylinen, M. Ziegler

    ASTROPHYSICAL JOURNAL LETTERS 709 (2) L146-L151 2010年2月

    DOI: 10.1088/2041-8205/709/2/L146  

    ISSN:2041-8205

    eISSN:2041-8213

  101. High-energy emission as a test of the prior emission model for gamma-ray burst afterglows 査読有り

    Kohta Murase, Kenji Toma, Ryo Yamazaki, Shigehiro Nagataki, Kunihito Ioka

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 402 (1) L54-L58 2010年2月

    DOI: 10.1111/j.1745-3933.2009.00799.x  

    ISSN:0035-8711

    eISSN:1365-2966

  102. AN UP-SCATTERED COCOON EMISSION MODEL OF GAMMA-RAY BURST HIGH-ENERGY LAGS 査読有り

    Kenji Toma, Xue-Feng Wu, Peter Meszaros

    ASTROPHYSICAL JOURNAL 707 (2) 1404-1416 2009年12月

    DOI: 10.1088/0004-637X/707/2/1404  

    ISSN:0004-637X

  103. A limit on the variation of the speed of light arising from quantum gravity effects 査読有り

    A. A. Abdo, M. Ackermann, M. Ajello, K. Asano, W. B. Atwood, M. Axelsson, L. Baldini, J. Ballet, G. Barbiellini, M. G. Baring, D. Bastieri, K. Bechtol, R. Bellazzini, B. Berenji, P. N. Bhat, E. Bissaldi, E. D. Bloom, E. Bonamente, J. Bonnell, A. W. Borgland, A. Bouvier, J. Bregeon, A. Brez, M. S. Briggs, M. Brigida, P. Bruel, J. M. Burgess, T. H. Burnett, G. A. Caliandro, R. A. Cameron, P. A. Caraveo, J. M. Casandjian, C. Cecchi, Oe Celik, V. Chaplin, E. Charles, C. C. Cheung, J. Chiang, S. Ciprini, R. Claus, J. Cohen-Tanugi, L. R. Cominsky, V. Connaughton, J. Conrad, S. Cutini, C. D. Dermer, A. de Angelis, F. de Palma, S. W. Digel, B. L. Dingus, E. do Couto e Silva, P. S. Drell, R. Dubois, D. Dumora, C. Farnier, C. Favuzzi, S. J. Fegan, J. Finke, G. Fishman, W. B. Focke, L. Foschini, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, N. Gehrels, S. Germani, L. Gibby, B. Giebels, N. Giglietto, F. Giordano, T. Glanzman, G. Godfrey, J. Granot, J. Greiner, I. A. Grenier, M. -H. Grondin, J. E. Grove, D. Grupe, L. Guillemot, S. Guiriec, Y. Hanabata, A. K. Harding, M. Hayashida, E. Hays, E. A. Hoversten, R. E. Hughes, G. Johannesson, A. S. Johnson, R. P. Johnson, W. N. Johnson, T. Kamae, H. Katagiri, J. Kataoka, N. Kawai, M. Kerr, R. M. Kippen, J. Knoedlseder, D. Kocevski, C. Kouveliotou, F. Kuehn, M. Kuss, J. Lande, L. Latronico, M. Lemoine-Goumard, F. Longo, F. Loparco, B. Lott, M. N. Lovellette, P. Lubrano, G. M. Madejski, A. Makeev, M. N. Mazziotta, S. McBreen, J. E. McEnery, S. McGlynn, P. Meszaros, C. Meurer, P. F. Michelson, W. Mitthumsiri, T. Mizuno, A. A. Moiseev, C. Monte, M. E. Monzani, E. Moretti, A. Morselli, I. V. Moskalenko, S. Murgia, T. Nakamori, P. L. Nolan, J. P. Norris, E. Nuss, M. Ohno, T. Ohsugi, N. Omodei, E. Orlando, J. F. Ormes, M. Ozaki, W. S. Paciesas, D. Paneque, J. H. Panetta, D. Parent, V. Pelassa, M. Pepe, M. Pesce-Rollins, V. Petrosian, F. Piron, T. A. Porter, R. Preece, S. Raino, E. Ramirez-Ruiz, R. Rando, M. Razzano, S. Razzaque, A. Reimer, O. Reimer, T. Reposeur, S. Ritz, L. S. Rochester, A. Y. Rodriguez, M. Roth, F. Ryde, H. F. -W. Sadrozinski, D. Sanchez, A. Sander, P. M. Saz Parkinson, J. D. Scargle, T. L. Schalk, C. Sgro, E. J. Siskind, D. A. Smith, P. D. Smith, G. Spandre, P. Spinelli, M. Stamatikos, F. W. Stecker, M. S. Strickman, D. J. Suson, H. Tajima, H. Takahashi, T. Takahashi, T. Tanaka, J. B. Thayer, J. G. Thayer, D. J. Thompson, L. Tibaldo, K. Toma, D. F. Torres, G. Tosti, E. Troja, Y. Uchiyama, T. Uehara, T. L. Usher, A. J. van der Horst, V. Vasileiou, N. Vilchez, V. Vitale, A. von Kienlin, A. P. Waite, P. Wang, C. Wilson-Hodge, B. L. Winer, K. S. Wood, X. F. Wu, R. Yamazaki, T. Ylinen, M. Ziegler

    NATURE 462 (7271) 331-334 2009年11月

    DOI: 10.1038/nature08574  

    ISSN:0028-0836

    eISSN:1476-4687

  104. STATISTICAL PROPERTIES OF GAMMA-RAY BURST POLARIZATION 査読有り

    Kenji Toma, Takanori Sakamoto, Bing Zhang, Joanne E. Hill, Mark L. McConnell, Peter F. Bloser, Ryo Yamazaki, Kunihito Ioka, Takashi Nakamura

    ASTROPHYSICAL JOURNAL 698 (2) 1042-1053 2009年6月

    DOI: 10.1088/0004-637X/698/2/1042  

    ISSN:0004-637X

    eISSN:1538-4357

  105. GRB 080913 AT REDSHIFT 6.7

    J. Greiner, T. Kruehler, J. P. U. Fynbo, A. Rossi, R. Schwarz, S. Klose, S. Savaglio, N. R. Tanvir, S. McBreen, T. Totani, B. B. Zhang, X. F. Wu, D. Watson, S. D. Barthelmy, A. P. Beardmore, P. Ferrero, N. Gehrels, D. A. Kann, N. Kawai, A. Kuepcue Yoldas, P. Meszaros, B. Milvang-Jensen, S. R. Oates, D. Pierini, P. Schady, K. Toma, P. M. Vreeswijk, A. Yoldas, B. Zhang, P. Afonso, K. Aoki, D. N. Burrows, C. Clemens, R. Filgas, Z. Haiman, D. H. Hartmann, G. Hasinger, J. Hjorth, E. Jehin, A. J. Levan, E. W. Liang, D. Malesani, T. -S. Pyo, S. Schulze, G. Szokoly, K. Terada, K. Wiersema

    ASTROPHYSICAL JOURNAL 693 (2) 1610-1620 2009年3月

    DOI: 10.1088/0004-637X/693/2/1610  

    ISSN:0004-637X

    eISSN:1538-4357

  106. The Correlation of Spectral Lag Evolution with Prompt Optical Emission in GRB 080319B 査読有り

    Michael Stamatikos, Tilan N. Ukwatta, Takanori Sakamoto, Kalvir S. Dhuga, Kenji Toma, Asaf Pe'er, Peter Meszaros, David L. Band, Jay P. Norris, Scott D. Barthelmy, Neil Gehrels

    GAMMA-RAY BUSTS 1133 356-+ 2009年

    ISSN:0094-243X

  107. Probing the efficiency of electron-proton coupling in relativistic collisionless shocks through the radio polarimetry of gamma-ray burst afterglows 査読有り

    Kenji Toma, Kunihito Ioka, Takashi Nakamura

    ASTROPHYSICAL JOURNAL LETTERS 673 (2) L123-L126 2008年2月

    DOI: 10.1086/528740  

    ISSN:2041-8205

    eISSN:2041-8213

  108. Shallow decay phase of X-ray afterglows

    R. Sato, K. Ioka, K. Toma, T. Nakamura, J. Kataoka, N. Kawai, T. Takahashi

    AIP Conference Proceedings 1000 32-35 2008年

    DOI: 10.1063/1.2943476  

    ISSN:0094-243X

    eISSN:1551-7616

  109. Probing the efficiency of electron-proton coupling in relativistic collisionless shocks through the radio polarimetry of gamma-ray burst afterglows 査読有り

    Kenji Toma, Kunihito Ioka, Takashi Nakamura

    Astrophysical Journal 673 (2) L123-L126 2008年

    出版者・発行元: Institute of Physics Publishing

    DOI: 10.1086/528740  

    ISSN:1538-4357 0004-637X

  110. Gamma-ray burst polarization 査読有り

    Kenji Toma

    ACCELERATORS IN THE UNIVERSE 1040 186-190 2008年

    ISSN:0094-243X

  111. Low-luminosity GRB 060218: A collapsar jet from a neutron star, leaving a magnetar as a remnant? 査読有り

    Kenji Toma, Kunihito Ioka, Takanori Sakamoto, Takashi Nakamura

    ASTROPHYSICAL JOURNAL 659 (2) 1420-1430 2007年4月

    DOI: 10.1086/512481  

    ISSN:0004-637X

    eISSN:1538-4357

  112. Efficiency crisis of swift gamma-ray bursts with shallow X-ray afterglows: prior activity or time-dependent microphysics? 査読有り

    K. Ioka, K. Toma, R. Yamazaki, T. Nakamura

    ASTRONOMY & ASTROPHYSICS 458 (1) 6-12 2006年10月

    DOI: 10.1051/0004-6361:20064939  

    ISSN:0004-6361

  113. Tail emission of prompt gamma-ray burst jets 査読有り

    R Yamazaki, K Toma, K Ioka, T Nakamura

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 369 (1) 311-316 2006年6月

    DOI: 10.1111/j.1365-2966.2006.10290.x  

    ISSN:0035-8711

    eISSN:1365-2966

  114. Shallow Decay of Early X-Ray Afterglow from Inhomogeneous Gamma-Ray Burst Jets 査読有り

    Kenji Toma, Kunihito Ioka, Ryo Yamazaki, Takashi Nakamura

    Astrophysical Journal Letters 640 (2) 139-142 2006年3月8日

    出版者・発行元: The American Astronomical Society

    DOI: 10.1086/503384  

    ISSN:0004-637X

    詳細を見る 詳細を閉じる

    Almost all the X-ray afterglows of γ-ray bursts (GRBs) observed by the Swift satellite have a shallow decay phase in their first few thousand seconds. We show that in an inhomogeneous-jet model (multiple-subjet or patchy-shell), the superposition of the afterglows of off-axis subjets (patchy shells) can produce the shallow decay phase. The necessary condition for obtaining the shallow decay phase is that γ-ray–bright subjets (patchy shells) have γ-ray efficiencies higher than previously estimated and that they be surrounded by γ-ray–dim subjets (patchy shells) with low γ-ray efficiency. Our model predicts that events with dim prompt emission will have a conventional afterglow light curve without a shallow decay phase, like GRB 050416A.

  115. Ep-Eiso correlation in a multiple subjet model of gamma-ray bursts 査読有り

    Kenji Toma, Ryo Yamazaki, Takashi Nakamura

    Astrophysical Journal 635 (1 I) 481-486 2005年12月10日

    DOI: 10.1086/497388  

    ISSN:0004-637X 1538-4357

  116. A possible origin of bimodal duration distribution of gamma-ray bursts 査読有り

    K Toma, R Yamazaki, T Nakamura

    NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA C-COLLOQUIA ON PHYSICS 28 (3) 451-454 2005年5月

    DOI: 10.1393/ncc/i2005-10081-9  

    ISSN:1124-1896

  117. A possible origin of bimodal distribution of gamma-ray bursts 査読有り

    Kenji Toma, Ryo Yamazaki, Takashi Nakamura

    Astrophysical Journal 620 (2 I) 835-839 2005年2月20日

    出版者・発行元: Institute of Physics Publishing

    DOI: 10.1086/427179  

    ISSN:1538-4357 0004-637X

︎全件表示 ︎最初の5件までを表示

MISC 39

  1. ブラックホール降着円盤とパルサーのX線偏光:IXPE衛星の成果と将来展望 招待有り 査読有り

    川島朋尚, 木坂将大, 當真賢二

    天文月報 348 117 2024年

  2. ブラックホールが駆動する相対論的ジェットの物理

    當真賢二

    日本物理学会誌 72 (1) 19-27 2017年1月

    出版者・発行元: 日本物理学会

    DOI: 10.11316/butsuri.72.1_19  

    ISSN: 0029-0181

  3. 高エネルギー天体物理学とその広がり

    當真賢二

    天文月報 2014年9月20日

  4. 19pSB-7 小型衛星搭載用ガンマ線バースト偏光度検出器の予想される性能(19pSB γ線,宇宙線・宇宙物理領域)

    郡司 修一, 中森 健之, 片桐 惇, 岸川 達哉, 老川 由馬, 高倉 美華, 上田 達也, 當真 賢二, 米徳 大輔, 三原 建弘

    日本物理学会講演概要集 69 (2) 40-40 2014年8月22日

    出版者・発行元: 一般社団法人日本物理学会

    ISSN: 1342-8349

  5. 19pSB-8 小型衛星搭載用ガンマ線バースト偏光度検出器の筐体設計と振動衝撃試験の結果(19pSB γ線,宇宙線・宇宙物理領域)

    岸川 達哉, 郡司 修一, 中森 健之, 片桐 惇, 老川 由馬, 高倉 美華, 上田 達也, 當真 賢二, 米徳 大輔, 三原 建弘

    日本物理学会講演概要集 69 (2) 40-40 2014年8月22日

    出版者・発行元: 一般社団法人日本物理学会

    ISSN: 1342-8349

  6. 29pTT-2 Blandford-Znajek processにおける起電力の起源(29pTT 宇宙物理・相対論,宇宙線・宇宙物理領域)

    當真 賢二

    日本物理学会講演概要集 69 (1) 133-133 2014年3月5日

    出版者・発行元: 一般社団法人日本物理学会

    ISSN: 1342-8349

  7. 29pTS-9 ガンマ線バーストの偏光と相対論的ジェットの研究(29pTS 若手奨励賞受賞記念講演,宇宙線・宇宙物理領域)

    當真 賢二

    日本物理学会講演概要集 69 (1) 133-133 2014年3月5日

    出版者・発行元: 一般社団法人日本物理学会

    ISSN: 1342-8349

  8. 18pSB-5 CTA報告77 : CTAで見るガンマ線パルサーとCrabフレア(18pSB 高エネルギーガンマ線(CTA,MAGIC),宇宙線・宇宙物理領域)

    齋藤 隆之, 郡 和範, 大平 豊, 井岡 邦仁, 内山 泰伸, 広谷 幸一, 木坂 将大, 石尾 一馬, 井上 進, 奥村 曉, 折戸 玲子, 川中 宣太, 櫛田 淳子, 窪 秀利, 小山 志勇, 田中 周太, 田中 孝明, 寺田 幸功, 當真 賢二, 内藤 統也, 長瀧 重博, 中森 健之, 花畑 義隆, 馬場 彩, 森 浩二, 山崎 了, 吉田 篤正, 李 兆衡

    日本物理学会講演概要集 69.2.1 (0) 33 2014年

    出版者・発行元: 一般社団法人 日本物理学会

    DOI: 10.11316/jpsgaiyo.69.2.1.0_33_1  

    eISSN: 2189-0803

  9. 26aEA-4 定常軸対称の相対論的MHDジェットの効率の良い加速(26aEA 領域2,地球電磁気・地球惑星圏学会,日本天文学会合同 プラズマ宇宙物理(3学会合同セッション:MHD,流体現象),領域2(プラズマ基礎・プラズマ科学・核融合プラズマ・プラズマ宇宙物理))

    當真 賢二

    日本物理学会講演概要集 68 (1) 255-255 2013年3月26日

    出版者・発行元: 一般社団法人日本物理学会

    ISSN: 1342-8349

  10. 14pSP-4 衛星搭載を目指したガンマ線バースト偏光度検出器の基礎開発(14pSP ガンマ線,宇宙線・宇宙物理領域)

    佐々木 大悟, 星野 利典, 郡司 修一, 坂野 光成, 米徳 大輔, 村上 敏夫, 岸本 祐二, 三原 建弘, 當真 賢二, 櫻井 敬久, 門叶 冬樹

    日本物理学会講演概要集 67 (2) 121-121 2012年8月24日

    出版者・発行元: 一般社団法人日本物理学会

    ISSN: 1342-8349

  11. 14pSP-5 IKAROS搭載ガンマ線バースト偏光検出器(GAP)による高偏光度プロンプト放射の検出(14pSP ガンマ線,宇宙線・宇宙物理領域)

    三原 建弘, 米徳 大輔, 村上 敏夫, 高橋 拓也, 若島 雄大, 米持 元, 郡司 修一, 當真 賢二

    日本物理学会講演概要集 67 (2) 121-121 2012年8月24日

    出版者・発行元: 一般社団法人日本物理学会

    ISSN: 1342-8349

  12. 24pGK-4 CTA報告31 : CTA時代におけるガンマ線バーストの研究(24pGK 高エネルギーガンマ線(CTAなど),宇宙線・宇宙物理領域)

    浅野 勝晃, 井岡 邦仁, 井上 進, 井上 芳幸, 大平 豊, 格和 純, 窪 秀利, 高橋 慶太郎, 手嶋 政廣, 当真 賢二, 長滝 重博, 中森 健之, 林田 将明, 深沢 泰司, 村瀬 孔大, 山崎 了, 山本 常夏

    日本物理学会講演概要集 67 (1) 128-128 2012年3月5日

    出版者・発行元: 一般社団法人日本物理学会

    ISSN: 1342-8349

  13. 24pGK-2 CTA報告29 : CTA時代における活動銀河核の研究(24pGK 高エネルギーガンマ線(CTAなど),宇宙線・宇宙物理領域)

    高見 一, 井上 進, 井上 芳幸, 窪 秀利, 高橋 慶太郎, 手嶋 政廣, 當真 賢二, 西嶋 恭司, 林田 将明, 深沢 泰司, 村瀬 孔大

    日本物理学会講演概要集 67 (1) 128-128 2012年3月5日

    出版者・発行元: 一般社団法人日本物理学会

    ISSN: 1342-8349

  14. 27aGJ-3 ガンマ線バースト偏光検出器(GAP)による系統的な偏光解析(27aGJ X線・γ線,宇宙線・宇宙物理領域)

    米徳 大輔, 村上 敏夫, 森原 良行, 郡司 修一, 三原 建弘, 當真 賢二

    日本物理学会講演概要集 67 (1) 143-143 2012年3月5日

    出版者・発行元: 一般社団法人日本物理学会

    ISSN: 1342-8349

  15. 19aSY-5 CTA報告21 : CTA時代におけるガンマ線バースト研究(19aSY γ線(CTAなど),宇宙線・宇宙物理領域)

    格和 純, 浅野 勝晃, 井岡 邦仁, 井上 進, 井上 芳幸, 大平 豊, 窪 秀利, 高橋 慶太郎, 手嶋 政廣, 當真 賢二, 長滝 重博, 林田 将明, 深沢 泰司, 村瀬 孔大, 山崎 了, 山本 常夏, CTA-Japan Consortium

    日本物理学会講演概要集 66 (2) 117-117 2011年8月24日

    出版者・発行元: 一般社団法人日本物理学会

    ISSN: 1342-8349

  16. 19aSY-4 CTA報告20 : CTA時代におけるAGN探査(19aSY γ線(CTAなど),宇宙線・宇宙物理領域)

    井上 芳幸, 深沢 泰司, 林田 将明, 井岡 邦仁, 井上 進, 窪 秀利, 村瀬 孔大, 西嶋 恭司, 高橋 慶太郎, 當真 賢二, 戸谷 友則, CTA-Japanコンソーシアム

    日本物理学会講演概要集 66 (2) 117-117 2011年8月24日

    出版者・発行元: 一般社団法人日本物理学会

    ISSN: 1342-8349

  17. 次世代チェレンコフ望遠鏡CTAで期待されるGRB検出率

    格和純, 浅野勝晃, 井岡邦仁, 井上進, 大平豊, 窪秀利, 高橋慶太郎, 田島宏康, 手嶋政廣, 手嶋政廣, 当真賢二, 戸谷友則, 長滝重博, 林田将明, 深沢泰司, 村瀬孔大, 山崎了, 山本常夏

    日本天文学会年会講演予稿集 2011 2011年

    ISSN: 1347-0639

  18. CTA(Cherenkov Telescope Array)によるGeV-TeVガンマ線観測で明らかにするガンマ線バースト

    井上進, 井上芳幸, 格和純, 山崎了, 山本常夏, 村瀬孔太, 当真賢二, 浅野勝晃, 井岡邦仁, 吉越貴紀, 手嶋政廣, HINTON Jim, STARLING Rhaana, CONNAUGHTON Valerie, O’BRIEN Paul, GRANOT Jonathan

    日本天文学会年会講演予稿集 2011 2011年

    ISSN: 1347-0639

  19. 26pGR-4 CTA報告11 : CTAで狙う物理 ガンマ線バーストの検出可能性(26pGR 高エネルギーガンマ線(CTA)・空気シャワー,宇宙線・宇宙物理領域)

    格和 純, 当真 賢二, 戸谷 友則, 長滝 重博, 林田 将明, 深沢 泰司, 村瀬 孔大, 山崎 了, 山本 常夏, CTA-Japan Consortium, 浅野 勝晃, 井岡 邦仁, 井上 進, 大平 豊, 窪 秀利, 高橋 慶太郎, 田島 宏康, 手嶋 政廣

    日本物理学会講演概要集 66 (0) 114-114 2011年

    出版者・発行元: 一般社団法人 日本物理学会

    ISSN: 1342-8349

  20. フェルミ衛星が明らかにしたガンマ線バーストの姿

    大野雅功, 浅野勝晃, 田島宏康, 當真賢二, 山崎了

    天文月報 103 315 2010年5月

  21. Statistical Properties of Gamma-Ray Burst Polarization

    K. Toma, T. Sakamoto, B. Zhang, J. E. Hill, M. L. McConnell, P. E. Bloser, R. Yamazaki, K. Ioka, T. Nakamura

    GAMMA-RAY BUSTS 1133 434-+ 2009年

    DOI: 10.1063/1.3155943  

    ISSN: 0094-243X

  22. GRB Polarimetry with POET

    M. L. McConnell, L. Angelini, M. G. Baring, S. Barthelmy, J. K. Black, P. F. Bloser, B. Dennis, A. G. Emslie, J. Greiner, W. Hajdas, A. K. Harding, D. H. Hartmann, J. E. Hill, K. Ioka, P. Kaaret, G. Kanbach, D. Kniffen, J. S. Legere, J. R. Macri, R. Morris, T. Nakamura, N. Produit, J. M. Ryan, T. Sakamoto, K. Toma, X. Wu, R. Yamazaki, B. Zhang

    GAMMA-RAY BUSTS 1133 64-+ 2009年

    DOI: 10.1063/1.3155969  

    ISSN: 0094-243X

  23. Investigation of jet break features in Swift gamma-ray bursts

    G. Sato, G. Sato, R. Yamazaki, K. Ioka, T. Sakamoto, T. Sakamoto, T. Takahashi, T. Takahashi, K. Nakazawa, T. Nakamura, K. Toma, D. Hullinger, D. Hullinger, D. Hullinger, M. Tashiro, A. M. Parsons, H. A. Krimm, H. A. Krimm, S. D. Barthelmy, N. Gehrels, D. N. Burrows, P. T. O'Brien, J. P. Osborne, G. Chincarini, G. Chincarini, D. Q. Lamb

    11th Marcel Grossmann Meeting on Recent Developments in Theoretical and Experimental General Relativity, Gravitation and Relativistic Field Theories - Proc. of the MG11 Meeting on General Relativity 2033-2035 2008年12月1日

  24. ガンマ線バーストの偏光

    當真賢二

    天文月報 101 442 2008年8月

  25. Statistical Properties of GRB Polarization

    Kenji Toma, Takanori Sakamoto, Joanne E. Hill, Bing Zhang, Ryo Yamazaki, Kunihito Ioka, Takashi Nakamura

    2008 NANJING GAMMA-RAY BURST CONFERENCE 1065 195-+ 2008年

    DOI: 10.1063/1.3027910  

    ISSN: 0094-243X

  26. Probing the efficiency of electron-proton coupling in relativistic collisionless shocks through the radio polarimetry of gamma-ray burst afterglows

    Kenji Toma, Kunihito Ioka, Takashi Nakamura

    GAMMA-RAY BURSTS 2007 1000 472-+ 2008年

    DOI: 10.1063/1.2943512  

    ISSN: 0094-243X

  27. Unstable GRB Photospheres and Blueshifted e± Annihilation Lines

    Kunihito Ioka, Kohta Murase, Kenji Toma, Shigehiro Nagataki, Takashi Nakamura

    AIP Conference Proceedings 1000 377-+ 2008年

    DOI: 10.1063/1.2943488  

    ISSN: 0094-243X

  28. POET: POlarimeters for Energetic Transients

    J. E. Hill, M. L. McConnell, P. Bloser, J. Legere, J. Macri, J. Ryan, S. Barthelmy, L. Angelini, T. Sakamoto, J. K. Black, D. H. Hartmann, P. Kaaret, B. Zhang, K. Ioka, T. Nakamura, K. Toma, R. Yamazaki, X. Wu

    2008 NANJING GAMMA-RAY BURST CONFERENCE 1065 331-+ 2008年

    DOI: 10.1063/1.3027941  

    ISSN: 0094-243X

  29. Unstable e± photospheres and GRB spectral relations

    Kunihito Ioka, Kohta Murase, Kenji Toma, Shigehiro Nagataki, Takashi Nakamura, Peter Mészáros

    AIP Conference Proceedings 1065 189-+ 2008年

    DOI: 10.1063/1.3027909  

    ISSN: 0094-243X

  30. Swift discovery of gamma-ray bursts without a jet break feature in their X-ray afterglows

    G. Sato, G. Sato, R. Yamazaki, K. Ioka, T. Sakamoto, T. Sakamoto, T. Takahashi, T. Takahashi, K. Nakazawa, T. Nakamura, K. Toma, D. Hullinger, D. Hullinger, D. Hullinger, M. Tashiro, A. M. Parsons, H. A. Krimm, H. A. Krimm, S. D. Barthelmy, N. Gehrels, D. N. Burrows, P. T. O'Brien, J. P. Osborne, G. Chincarini, G. Chincarini, D. Q. Lamb

    Astrophysical Journal 657 (1) 359-366 2007年3月1日

    出版者・発行元: American Astronomical Society

    DOI: 10.1086/510610  

    ISSN: 0004-637X

    eISSN: 1538-4357

  31. Unstable GRB photospheres and e± annihilation lines

    Kunihito Ioka, Kohta Murase, Kenji Toma, Shigehiro Nagataki, Takashi Nakamura

    Astrophysical Journal 670 (2) L77-L80 2007年

    出版者・発行元: Institute of Physics Publishing

    DOI: 10.1086/524405  

    ISSN: 1538-4357 0004-637X

  32. Tail emission of prompt gamma-ray burst jets

    R. Yamazaki, K. Toma, K. Ioka, T. Nakamura

    NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA B-GENERAL PHYSICS RELATIVITY ASTRONOMY AND MATHEMATICAL PHYSICS AND METHODS 121 (12) 1627-1628 2006年12月

    DOI: 10.1393/ncb/i2007-10334-6  

    ISSN: 1594-9982

  33. Low-luminosity grb 060218: A collapsar jet from a neutron star?

    Kenji Toma, Kunihito Ioka, Takanori Sakamoto, Takashi Nakamura

    Proceedings of the 16th Workshop on General Relativity and Gravitation in Japan, JGRG 2006 74-77 2006年12月1日

  34. Tail emission of prompt gamma-ray burst jets

    Ryo Yamazaki, Kenji Toma, Kunihito Ioka, Takashi Nakamura

    GAMMA-RAY BURSTS IN THE SWIFT ERA 836 205-+ 2006年

    DOI: 10.1063/1.2207891  

    ISSN: 0094-243X

  35. Early afterglow and variability

    Kunihito Ioka, Shiho Kobayashi, Bing Zhang, Toma Kenji, Ryo Yamazaki, Takashi Nakamura

    GAMMA-RAY BURSTS IN THE SWIFT ERA 836 301-+ 2006年

    DOI: 10.1063/1.2207907  

    ISSN: 0094-243X

  36. Shallow decay of early X-ray afterglows from inhomogeneous gamma-ray burst jets

    K. Toma, K. Ioka, R. Yamazaki, T. Nakamura

    GAMMA-RAY BURSTS IN THE SWIFT ERA 836 337-+ 2006年

    DOI: 10.1063/1.2207916  

    ISSN: 0094-243X

  37. A unified model of short and long gamma-ray bursts, X-ray rich gamma-ray bursts, and X-ray flashes

    Ryo Yamazaki, Kunihito Ioka, Takashi Nakamura, Kenji Toma

    GALACTIC AND EXTRAGALACTIC ASTROPHYSICS 38 (7) 1299-+ 2006年

    DOI: 10.1016/j.asr.2005.06.006  

    ISSN: 0273-1177

  38. A unified model of short and long gamma-ray bursts, X-ray-rich gamma-ray bursts, and X-ray flashes

    R Yamazaki, K Ioka, T Nakamura, K Toma

    NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA C-COLLOQUIA ON PHYSICS 28 (3) 463-466 2005年5月

    DOI: 10.1393/ncc/i2005-10084-6  

    ISSN: 1124-1896

  39. A Unified Model for Gamma-Ray Bursts

    Ryo Yamazaki, Kunihito Ioka, Takashi Nakamura, Kenji Toma

    2005年2月23日

    詳細を見る 詳細を閉じる

    A possible unified model of short and long gamma-ray bursts (GRBs), X-ray<br /> rich GRBs, and X-ray flashes is proposed. It is assumed that the jet of a GRB<br /> consists of many emitting sub-shells (i.e., an inhomogeneous jet model). The<br /> multiplicity of the sub-shells along a line of sight n_s is an important<br /> parameter. If n_s is large (&gt;&gt;1) the event looks like a long GRB, while if<br /> n_s=1, the event looks like a short GRB. Finally, when n_s=0, the event looks<br /> like an X-ray flash or an X-ray rich GRB. Furthermore, our model may also<br /> explain the bimodal distributions of T90 duration of BATSE-GRBs. Cle...

︎全件表示 ︎最初の5件までを表示

書籍等出版物 2

  1. 百科繚覧 ~若手研究者が挑む学際フロンティア~ vol.2

    東北大学学際科学フロンティア研究所 百科繚覧 編集委員会

    東北大学出版会 2020年1月

  2. 百科繚覧 ~若手研究者が挑む学際フロンティア~

    東北大学学際科学フロンティア研究所, 百科繚覧, 編集委員会

    東北大学出版会 2019年1月

講演・口頭発表等 81

  1. Theory of multi-wavelength flares from black hole magnetospheres and strategy of joint monitoring observations of M87 with global VLBI, Swift and CTA 国際会議 招待有り

    Kenji Toma

    CTA-Japan Workshop 2024 2025年1月8日

  2. Blandford-Znajek過程におけるブラックホール回転エネルギー減少のメカニズムについて

    當真賢二

    第37回理論天文学宇宙物理学懇談会シンポジウム 2024年12月26日

  3. Blandford-Znajek過程におけるブラックホール回転エネルギー減少のメカニズムについて

    當真賢二

    日本天文学会秋季年会 2024年9月12日

  4. Discussion: theoretical outlook on the future of GRB polarization 国際会議 招待有り

    Kenji Toma

    GRB Forum 2024 2024年7月11日

  5. 恩師高原さんとjet論争 招待有り

    當真賢二

    第36回理論懇シンポジウム 2023年12月26日

  6. ブラックホール磁気圏強電場領域の研究:降着円盤由来MeV光子の影響

    金滉基, 木坂将太, 當真賢二

    日本天文学会2023年秋季年会 2023年9月21日

  7. ガンマ線バースト残光の流体スケール乱流磁場モデルによる偏光観測の解釈

    桑田明日香, 當真賢二, 浦田裕次

    日本天文学会2023年秋季年会 2023年9月21日

  8. GRB Prompt Emission Polarization 招待有り

    Kenji Toma

    New Evolution of Multi-Messenger Astrophysics 2023年8月21日

  9. Magnetic reconnection in black hole magnetospheres: lepton loading into jets and superluminal radio blobs

    Kenji Toma

    APRIM 2023 2023年8月8日

  10. Magnetic reconnection in black hole magnetospheres as an origin of superluminal radio blobs

    Kenji Toma

    EHT Collaboration Meeting Summer 2023 2023年6月27日

  11. ガンマ線バーストの可視・電波偏光同時観測から測る真の全エネルギー

    當真賢二, 浦田裕次, S. Covino, K. Wiersema

    日本天文学会2023年春季年会 2023年3月16日

  12. AGNジェットの粒子の起源

    當真賢二, 木村成生, 野田博文, 秦和弘

    高エネルギー宇宙物理学研究会 2022年11月8日

  13. ブラックホールジェットの地平面近傍の電波放射機構: Sgr A*で見えない理由

    木村成生, 當真賢二, 野田博文, 秦和弘

    日本天文学会秋季年会 2022年9月14日

  14. 強磁場降着流ガンマ線放射モデル:電子加熱率の影響

    久世陸, 木村成生, 當真賢二

    日本天文学会秋季年会 2022年9月14日

  15. 重力波に付随するニュートリノ信号の予言:コクーン光子の効果

    松井理輝, 木村成生, 當真賢二

    日本天文学会秋季年会 2022年9月14日

  16. Synchrotron Polarization of Gamma-Ray Burst Afterglow Shocks with Hydrodynamic-scale Turbulent Magnetic Field

    Asuka Kuwata, Kenji Tooma, Shigeo Kimura, Sara Tomita, Jiro Shimoda

    Astrophysical Polarimetry in the Time-Domain Era

  17. High-energy gamma-rays from magnetically arrested disks in nearby radio galaxies

    Riku Kuze, Shigeo Kimura, Kenji Toma

    TeV Particle Astrophysics 2022 2022年8月10日

  18. Blandford-Znajek過程による時空の時間変化

    當真賢二

    日本天文学会春季年会 2022年3月4日

  19. 強磁場降着流ガンマ線放射モデル:近傍電波銀河の観測データとの比較

    久世陸, 木村成生, 當真賢二

    日本天文学会春季年会 2022年3月4日

  20. ガンマ線バースト残光の偏光から探る相対論的衝撃波の磁場構造

    桑田明日香, 木村成生, 冨田沙羅, 霜田治朗, 當真賢二

    日本天文学会春季年会 2022年3月3日

  21. 相対論的ジェットの駆動・加速・放射の基礎理論と諸問題 招待有り

    當真賢二

    ブラックホールジェット・降着円盤・円盤風研究会2022 2022年1月24日

  22. Emission from Black Hole Jets 招待有り

    Kenji Toma

    Extreme Outflows in Astrophysical Transients 2021年8月23日

  23. Hadronic emission in disk and pair-creation gap in jet

    Kenji Toma

    Polarized Radiation near Supermassive Black Holes 2021年5月13日

  24. Polarimetric studies of GRBs, AGN jets, and axion dark matter 招待有り

    Kenji Toma

    IAU Symposium 360: Astronomical Polarimetry 2020 2021年3月26日

  25. Recent Topics in High Energy Astrophysics 招待有り

    當真 賢二

    14th Asia Pacific Physics Conference 2019年11月20日

  26. GRB polarization: an overview 招待有り

    當真 賢二

    Gamma-Ray Bursts in the Gravitational Wave Era 2019 2019年10月30日

  27. EHTによるM87*の観測成果V:非対称リング放射構造の理論的解釈

    當真賢二、他EHT Collaboration

    日本天文学会2019年秋季年会 2019年9月11日

  28. ブラックホールジェット研究の新展開 招待有り

    當真 賢二

    第49回天文・天体物理若手夏の学校 2019年7月31日

  29. M87 black hole shadow image and its connection with the radio jet 招待有り

    當真 賢二

    High Energy Astrophysics Japan Israel Workshop 2019年7月19日

  30. GRB prompt emission polarization: an overview 国際会議 招待有り

    當真 賢二

    Shedding new light on gamma-ray bursts with polarization data 2018年11月27日

  31. AGN jet physics on the horizon scale 招待有り

    當真 賢二

    高エネルギー天体現象の多様性 2018年11月20日

  32. 身一つで渡り歩く学際ネットワーキング 招待有り

    當真 賢二

    紐帯の織り手:ネットワーク形成の極意とアカデミアの役割 2018年7月11日

  33. Gamma-ray bursts as an experimental tool of fundamental physics 国際会議 招待有り

    當真 賢二

    Essential next steps for gravity and cosmology 2018年6月20日

  34. Formation and dissipation mechanisms of AGN jets 国際会議 招待有り

    當真 賢二

    Jet and Shock Breakouts in Cosmic Transients 2018年5月17日

  35. 一般相対論が絡むプラズマ過程 招待有り

    當真 賢二

    日本物理学会第73回年次大会 プラズマ宇宙物理3学会合同シンポジウム 2018年3月22日

  36. Theoretical and Observational Studies on Relativistic Jets Driven by Black Holes 国際会議 招待有り

    當真 賢二

    27th Workshop on General Relativity and Gravitation in Japan 2017年11月27日

  37. GRBの偏光 招待有り

    當真 賢二

    宇宙線研究所研究会:ガンマ線バースト研究の新機軸 2017年11月22日

  38. Theoretical Studies of GRBs with Multi-wavelength polarimetry 国際会議 招待有り

    當真 賢二

    2nd Core-U International Conference: Cosmic Polarimetry from Micro to Macro Scales 2017年2月18日

  39. Acceleration and Collimation of Relativistic Jets 国際会議 招待有り

    當真 賢二

    Challenges of AGN Jets 2017年1月17日

  40. Radio Polarimetric Study of Gamma-Ray Bursts 国際会議 招待有り

    SMA science in the next decade 2016年10月27日

  41. Causal production of the electromagnetic energy flux and role of the negative energies in the Blandford-Znajek process 国際会議

    IAU Symposium 324: New Frontiers in Black Hole Astrophysics 2016年9月

  42. Causal production of the electromagnetic energy flux in the Blandford-Znajek process 国際会議

    M87 Workshop 2016年5月

  43. Blandford-Znajek過程における負のエネルギーの役割

    日本物理学会第71回年次大会 2016年3月

  44. Blandford-Znajek過程とPenrose過程の関係2

    日本天文学会春季年会 2016年3月

  45. "Theoretical Studies of Gamma-Ray Bursts with Multi-wavelength Polarimetry" 国際会議

    2nd Core-U International Conference: Cosmic Polarimetry from Micro to Macro Scales 2016年2月17日

  46. ブラックホールジェットの駆動と加速の物理

    相対論的ジェットの根元と粒子加速 2016年2月15日

  47. GRB Polarization

    GRB workshop 2015 2015年8月31日

  48. Efficient acceleration of relativistic magnetohydrodynamic jets: theoretical study 国際会議

    8th East Asia VLBI Workshop 2015年7月

  49. Relation between Blandford-Znajek Process and Penrose Process 国際会議

    Relativistic Jets: Creation, Dynamics, and Internal Physics 2015年4月20日

  50. First Stars Signatures in GRBs 国際会議

    ISSI-BJ workshop: GRBs: A Tool to Explore the Young Universe 2015年4月13日

  51. Blandford-Znajek過程とPenrose過程の関係

    日本天文学会春季年会 2015年3月

  52. ブラックホールと中性子星の周辺におけるプラズマ物理

    第27回理論天文学宇宙物理学懇談会シンポジウム 2014年12月24日

  53. 相対論的ジェットの駆動メカニズム

    High Energy Astrophysics & Astroparticle Physics 2014 2014年10月14日

  54. ブラックホールジェット

    宇宙プラズマ研究会 2014年9月

  55. 回転ブラックホール駆動ジェットのメカニズム

    日本流体力学会年会 2014年9月

  56. X線・γ線偏光のサイエンス

    高宇連シンポジウム『2020年代の高エネルギー宇宙物理学』 2014年8月23日

  57. 高エネルギー天文学の魅力とその広がり(受賞講演)

    日本天文学会春季年会 2014年3月

  58. Blandford-Znajek processにおける起電力の起源

    日本天文学会春季年会 2014年3月

  59. ガンマ線バーストの偏光と相対論的ジェットの研究(受賞講演)

    日本物理学会第69回年次大会 2014年3月

  60. Blandford-Znajek processにおける起電力の起源

    日本物理学会第69回年次大会 2014年3月

  61. 初代星とガンマ線バースト

    初代星研究会2013 2014年1月

  62. Probing the GRB Emission Mechanism through the gamma- and X-ray polarimetry 国際会議

    Supernovae and Gamma-Ray Bursts in Kyoto 2013年11月

  63. AGNジェット:駆動・加速・放射機構理論と電波偏光観測によるアプローチ

    ALMA workshop: Black Hole High-Energy phenomena 2013年9月

  64. 相対論的ジェット駆動機構の研究

    学振特別研究員SPD発表会 2013年6月

  65. Efficient Acceleration of Relativistic MHD Jets 国際会議

    Gravitational Waves: Revolution in Astronomy and Astrophysics 2013年6月

  66. Polarization of GRB Prompt Emission 国際会議

    GRB 2013 2013年4月

  67. 相対論的MHDジェットの効率良い加速

    日本天文学会春季年会 2013年3月

  68. 定常軸対称の相対論的MHDジェットの効率の良い加速

    日本物理学会第68回年次大会 2013年3月

  69. Strict Limit on CPT Violation from Polarization of Gamma-Ray Bursts

    TeVPA 2012 2012年12月

  70. 相対論的MHDジェットの効率良い加速

    第25回理論天文学宇宙物理学懇談会シンポジウム 2012年12月

  71. 最近のGRB偏光観測の理論的解釈とMHDジェットモデル

    ガンマ線バースト研究会 2012年11月

  72. ジェット天体の偏光理論

    日本天文学会秋季年会 2012年9月

  73. Polarization of GRB Prompt Emission and Early Afterglows 国際会議

    13th Marcel Grossman Meeting 2012年7月

  74. Population III GRBs and their Afterglows 国際会議

    13th Marcel Grossman Meeting 2012年7月

  75. Baryon Loading of AGN Jets Mediated by Neutrons 国際会議

    Black Holes by the Black Sea 2012年6月

  76. 活動銀河核ジェット形成における中性子の役割 国際会議

    日本天文学会春季年会 2012年3月

  77. Recent Progress in GRB Study 国際会議

    High Energy Astrophysics & Astroparticle Physics 2011 2011年11月

  78. 最新の観測結果から探るガンマ線バースト放射機構

    第24回理論天文学宇宙物理学懇談会シンポジウム 2011年11月

  79. ガンマ線バーストの電波/可視/X/γ偏光の理論

    次世代の多波長偏光サイエンスの開拓 2011年9月

  80. フェルミ衛星が発見した新しいスペクトル成分の理論モデル

    日本天文学会秋季年会 2011年9月

  81. Population III Gamma-Ray Bursts 国際会議

    GRBs as Probes 2011年5月

︎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 8

  1. 超大規模計算と超高精度観測で解き明かすブラックホールジェットの駆動機構と多様性

    大須賀 健, 高橋 博之, 當真 賢二, 秦 和弘

    2021年4月5日 ~ 2026年3月31日

  2. 原始惑星系円盤の偏光観測による暗黒物質アクシオン探査

    當真 賢二

    提供機関:Japan Society for the Promotion of Science

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

    研究種目:Grant-in-Aid for Challenging Research (Exploratory)

    研究機関:Tohoku University

    2021年7月 ~ 2023年3月

    詳細を見る 詳細を閉じる

    暗黒物質は、宇宙の進化において不可欠と考えられているにもかかわらず、その正体は全くの不明である。近年、素粒子論と宇宙構造形成論において最も活発に議論されている暗黒物質候補がアクシオンである。我々はアクシオンが光の偏光に影響することに着目し、原始惑星系円盤の偏光観測を用いてアクシオンを探査できるという全く新しい手法を2019年に提唱した。そしてSubaru望遠鏡で2011年に得られたAB Aurigaeの偏光データからアクシオンの存在に対しそれまでで最も厳しい制限を導いている。原始惑星系円盤の観測手法が著しく発展していることも我々のアクシオン探査手法の強みである。本研究では、2011年以降の既存の良質な観測データの解析やアップグレードされたSubaru高精度偏光観測装置SCExAOによる観測を図り、制限の更新あるいはアクシオンの兆候を捕えることを目指す。またアクシオンエネルギーが振動することによる偏光角振動を抽出する解析手法を確立する。 当該年度の成果として、VLT望遠鏡の観測装置SPHEREによるTW Hydraeの観測データを解析し、系統誤差の評価が想定以上に重要であることを明らかにできた。また偏光角振動の抽出解析手法を議論した。系統誤差への対処と偏光角振動の抽出解析手法を含めたSubaruの高精度偏光観測装置SCExAO fast-PDI modeの観測計画を立て、観測プロポーザルを申請し、採択された。

  3. 最新の超高解像度電波観測データを使ったブラックホールジェット駆動機構の検証 競争的資金

    當真 賢二

    2018年4月 ~ 2022年3月

  4. 全天可視偏光サーベイで解き明かす銀河系構造と宇宙突発現象のメカニズム

    川端 弘治, 渡邉 誠, 西山 正吾, 松村 雅文, 當真 賢二

    提供機関:Japan Society for the Promotion of Science

    制度名:Grants-in-Aid for Scientific Research

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

    研究機関:Hiroshima University

    2018年4月1日 ~ 2021年3月31日

    詳細を見る 詳細を閉じる

    北天数百万個の恒星の偏光サーベイにより大規模かつ高精度の偏光データベースを構築するSGMAP計画の観測装置の開発に関して、広視野偏光器の実現の鍵を握る大型・広波長帯域・大許容入射角の半波長板および偏光ビームスプリッター、コンパクトな光学トレインを設計すると共に、試作品の光学試験やシミュレーションを通じて、広島大学1.5mかなた望遠鏡での可視・近赤外多バンド偏光サーベイ実現性のメドを得る。また、既存装置を用いた銀河面領域および時間変動を示す偏光天体の偏光撮像観測を実施し、実データに基づいて偏光サーベイ観測のデータリダクションパイプラインを整備し、銀河磁場の三次元構造の抽出等の研究の端緒を得る。

  5. 偏光理論と一般相対論的電磁気学を駆使したブラックホールジェット駆動機構の解明 競争的資金

    當真 賢二

    2015年4月 ~ 2017年3月

  6. ガンマ線バーストの起源の解明 競争的資金

    當真 賢二

    2011年4月 ~ 2014年3月

  7. Theoretical Models of Gamma-Ray Bursts in Light of the Fermi LAT-GBM Observations 競争的資金

    當真 賢二

    提供機関:NASA

    制度名:Fermi GI Program, Cycle 2

    2009年9月 ~ 2010年8月

  8. ガンマ線バーストの統一モデルの研究 競争的資金

    當真 賢二

    2006年4月 ~ 2007年3月

︎全件表示 ︎最初の5件までを表示

担当経験のある科目(授業) 12

  1. 天体物理学実習I 東北大学理学部

  2. Interdisciplinary Sciences 〜分野を飛び越えて大学での学びを広げよう〜 東北大学全学教育科目

  3. 高エネルギー天文学 東北大学理学部/理学研究科

  4. 宇宙物理特論2 立教大学大学院理学研究科

  5. 星間物質学特別講義「高エネルギー天体物理学入門」 名古屋大学大学院理学研究科

  6. 自然科学特論2 大分大学理工学部

  7. 物理科学特論I 「ブラックホールジェットと高エネルギー現象」 青山学院大学大学院

  8. 宇宙物理特講I「ブラックホールジェットの物理」 筑波大学理工情報生命学術院

  9. 先端科学特別講義「高エネルギー天体物理学」 鹿児島大学理工学研究科

  10. 物理科学特別講義「高エネルギー天体物理学」 鹿児島大学理学部

  11. 宇宙物理学特別講義2「ブラックホールジェット研究最前線」 京都大学理学研究科

  12. 天体物理学実習II 東北大学理学部

︎全件表示 ︎最初の5件までを表示

社会貢献活動 3

  1. 一般講演会

    これがブラックホールだ! ~第一線の研究者が語る真実~

    2019年6月29日 ~

  2. 一般講演会

    見えない天体をついに見た! -ブラックホールの直接撮像に挑んだ研究者たち-

    2019年5月26日 ~

  3. ガンマ線バーストの残光に円偏光発見

    2014年5月8日 ~

メディア報道 2

  1. 情熱大陸「本間希樹」においてコメント

    2019年4月14日

    メディア報道種別: テレビ・ラジオ番組

  2. 史上初!ブラックホールの撮影に成功

    記者会見

    2019年4月10日

    メディア報道種別: テレビ・ラジオ番組