論文 - 山内 誠
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Hitomi Constraints on the 3.5 keV Line in the Perseus Galaxy Cluster 査読あり
Aharonian F., Akamatsu H., Akimoto F., Allen S., Angelini L., Arnaud K., Audard M., Awaki H., Axelsson M., Bamba A., Bautz M., Blandford R., Bulbul E., Brenneman L., Brown G., Cackett E., Chernyakova M., Chiao M., Coppi P., Costantini E., Plaa J., Herder J., Done C., Dotani T., Ebisawa K., Eckart M., Enoto T., Ezoe Y., Fabian A., Ferrigno C., Foster A., Fujimoto R., Fukazawa Y., Furuzawa A., Galeazzi M., Gallo L., Gandhi P., Giustini M., Goldwurm A., Gu L., Guainazzi M., Haba Y., Hagino K., Hamaguchi K., Harrus I., Hatsukade I., Hayashi K., Hayashi T., Hayashida K., Hiraga J., Hornschemeier A., Hoshino A., Hughes J., Ichinohe Y., Iizuka R., Inoue H., Inoue S., Inoue Y., Ishibashi K., Ishida M., Ishikawa K., Ishisaki Y., Itoh M., Iwai M., Iyomoto N., Kaastra J., Kallman T., Kamae T., Kara E., Kataoka J., Katsuda S., Katsuta J., Kawaharada M., Kawai N., Kelley R., Khangulyan D., Kilbourne C., King A., Kitaguchi T., Kitamoto S., Kitayama T., Kohmura T., Kokubun M., Koyama S., Koyama K., Kretschmar P., Krimm H., Kubota A.
Astrophysical Journal Letters 837 ( 1 ) L15-1 - L15-9 2017年3月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Astrophysical Journal Letters
© 2017. The American Astronomical Society. All rights reserved. High-resolution X-ray spectroscopy with Hitomi was expected to resolve the origin of the faint unidentified E ≈ 3.5 keV emission line reported in several low-resolution studies of various massive systems, such as galaxies and clusters, including the Perseus cluster. We have analyzed the Hitomi first-light observation of the Perseus cluster. The emission line expected for Perseus based on the XMM-Newton signal from the large cluster sample under the dark matter decay scenario is too faint to be detectable in the Hitomi data. However, the previously reported 3.5 keV flux from Perseus was anomalously high compared to the sample-based prediction. We find no unidentified line at the reported high flux level. Taking into account the XMM measurement uncertainties for this region, the inconsistency with Hitomi is at a 99% significance for a broad dark matter line and at 99.7% for a narrow line from the gas. We do not find anomalously high fluxes of the nearby faint K line or the Ar satellite line that were proposed as explanations for the earlier 3.5 keV detections. We do find a hint of a broad excess near the energies of high-n transitions of S xvi (E ≃ 3.44 keV rest-frame) - a possible signature of charge exchange in the molecular nebula and another proposed explanation for the unidentified line. While its energy is consistent with XMM pn detections, it is unlikely to explain the MOS signal. A confirmation of this interesting feature has to wait for a more sensitive observation with a future calorimeter experiment.
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山内 誠
日本物理学会誌 72 ( 4 ) 252 - 253 2017年
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The quiescent intracluster medium in the core of the Perseus cluster 査読あり
Aharonian F., Akamatsu H., Akimoto F., Allen S., Anabuki N., Angelini L., Arnaud K., Audard M., Awaki H., Axelsson M., Bamba A., Bautz M., Blandford R., Brenneman L., Brown G., Bulbul E., Cackett E., Chernyakova M., Chiao M., Coppi P., Costantini E., De Plaa J., Den Herder J., Done C., Dotani T., Ebisawa K., Eckart M., Enoto T., Ezoe Y., Fabian A., Ferrigno C., Foster A., Fujimoto R., Fukazawa Y., Furuzawa A., Galeazzi M., Gallo L., Gandhi P., Giustini M., Goldwurm A., Gu L., Guainazzi M., Haba Y., Hagino K., Hamaguchi K., Harrus I., Hatsukade I., Hayashi K., Hayashi T., Hayashida K., Hiraga J., Hornschemeier A., Hoshino A., Hughes J., Iizuka R., Inoue H., Inoue Y., Ishibashi K., Ishida M., Ishikawa K., Ishisaki Y., Itoh M., Iyomoto N., Kaastra J., Kallman T., Kamae T., Kara E., Kataoka J., Katsuda S., Katsuta J., Kawaharada M., Kawai N., Kelley R., Khangulyan D., Kilbourne C., King A., Kitaguchi T., Kitamoto S., Kitayama T., Kohmura T., Kokubun M., Koyama S., Koyama K., Kretschmar P., Krimm H., Kubota A., Kunieda H., Laurent P.
Nature 535 ( 7610 ) 117 - 121 2016年7月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Nature
© 2016 Macmillan Publishers Limited. All rights reserved. Clusters of galaxies are the most massive gravitationally bound objects in the Universe and are still forming. They are thus important probes of cosmological parameters and many astrophysical processes. However, knowledge of the dynamics of the pervasive hot gas, the mass of which is much larger than the combined mass of all the stars in the cluster, is lacking. Such knowledge would enable insights into the injection of mechanical energy by the central supermassive black hole and the use of hydrostatic equilibrium for determining cluster masses. X-rays from the core of the Perseus cluster are emitted by the 50-million-kelvin diffuse hot plasma filling its gravitational potential well. The active galactic nucleus of the central galaxy NGC 1275 is pumping jetted energy into the surrounding intracluster medium, creating buoyant bubbles filled with relativistic plasma. These bubbles probably induce motions in the intracluster medium and heat the inner gas, preventing runaway radiative cooling - a process known as active galactic nucleus feedback. Here we report X-ray observations of the core of the Perseus cluster, which reveal a remarkably quiescent atmosphere in which the gas has a line-of-sight velocity dispersion of 164 ± 10 kilometres per second in the region 30-60 kiloparsecs from the central nucleus. A gradient in the line-of-sight velocity of 150 ± 70 kilometres per second is found across the 60-kiloparsec image of the cluster core. Turbulent pressure support in the gas is four per cent of the thermodynamic pressure, with large-scale shear at most doubling this estimate. We infer that a total cluster mass determined from hydrostatic equilibrium in a central region would require little correction for turbulent pressure.
DOI： 10.1038/nature18627
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The ASTRO-H (Hitomi) x-ray astronomy satellite 査読あり
T. Takahashi, M. Kokubun, K. Mitsuda, R. Kelley, M. Yamauchi 他264名
Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series 9905 9905U-1 - 9905U-17 2016年7月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Soft x-ray imager (SXI) onboard ASTRO-H 査読あり
H. Tsunemi, K. Hayashida, T. G. Tsuru, T. Dotani, M.Yamauchi 他20名
Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series 9905 990510-1 - 990510-11 2016年7月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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The MAXI/GSC Nova-Alert System and results of its first 68 months 査読あり
Negoro H., Kohama M., Serino M., Saito H., Takahashi T., Miyoshi S., Ozawa H., Suwa F., Asada M., Fukushima K., Eguchi S., Kawai N., Kennea J., Mihara T., Morii M., Nakahira S., Ogawa Y., Sugawara A., Tomida H., Ueno S., Ishikawa M., Isobe N., Kawamuro T., Kimura M., Masumitsu T., Nakagawa Y., Nakajima M., Sakamoto T., Shidatsu M., Sugizaki M., Sugimoto J., Suzuki K., Takagi T., Tanaka K., Tsuboi Y., Tsunemi H., Ueda Y., Yamaoka K., Yamauchi M., Yoshida A., Matsuoka M.
Publications of the Astronomical Society of Japan 68 ( SP1 ) S1-1 - S1-24 2016年6月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Publications of the Astronomical Society of Japan
© 2016 The Author. Published by Oxford University Press on behalf of the Astronomical Society of Japan. Various transient phenomena on a timescale ranging from seconds to days appear at unexpected sky positions in X-rays. MAXI, Monitor of All-sky X-ray Image, on the International Space Station has been monitoring about 95% of the sky a day and has detected transient objects since 2009 August. Here, we describe quasi-real-time data processing systems of MAXI and a subsequent nova-alert system to find transient objects, and present the capabilities for the nova-alert system to detect transient events with excess fluxes from ≥80 mCrab in a single scan transit to ≥8 mCrab for 4 d, and to send prompt alert information to the world in less than 30 s after the onboard detection of a burst, making the best use of the International Space Station (ISS) real-time network. We also report on highlights of scientific results obtained with the system until the end of the first extended mission phase, 2015 March. Including 15 X-ray novae solely or independently discovered, we have reported on 177 transient phenomena, such as X-ray bursts, outbursts, and state transitions of X-ray binaries and X-ray flares from active stars and blazars, via the Astronomer's Telegram, and on 63 burst phenomena of other types via the Gamma-ray Coordinates Network. We summarize the results of these transient sources and phenomena focusing on the detections with the nova-alert system, and some new transients yet unpublished or requiring attention.
DOI： 10.1093/pasj/psw016
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Suzaku Wide-band All-sky Monitor measurements of duration distributions of gamma-ray bursts 査読あり
N. Ohmori, K. Yamaoka, M. Ohno, S. Sugita, M. Yamauchi 他23名
Publications of the Astronomical Society of Japan 68 ( SP1 ) S30-1 - S30-11 2016年6月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Soft X-ray Imager (SXI) for the ASTRO-H Mission 査読あり
T. Tanak, H. Tsunemi, K. Hayashida, T. G. Tsuru, T. Dotani, 他19名
Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series 9601 96010E-1 - 96010E-10 2015年9月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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MAXI observations of gamma-ray bursts 査読あり
Serino Motoko, Sakamoto Takanori, Kawai Nobuyuki, Yoshida Atsumasa, Ohno Masanori, 他38名
Publications of the Astronomical Society of Japan 66 ( 5 ) 87-1 - 87-14 2014年10月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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MAXI/SSC catalogue
Yoshidome Koshiro, Yamauchi Makoto, Hanayama Takanori, Yamada Hisaki, Morooka Yoshitaka, Tsunemi Hiroshi, Sasaki Masayuki, Uchida Daiki, Tomida Hiroshi, Nakahira Satoshi, Kimura Masashi, Sugizaki Mutsumi
Proceedings of a conference on "Suzaku-MAXI 2014: Expanding the Frontiers of the X-ray Universe" 258 - 259 2014年9月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Background study of MAXI/SSC
Yamada Hisaki, Yamauchi Makoto, Yoshidome Koshiro, Morooka Yoshitaka, Daikyuji Arata, Tomida Hiroshi, Nakahira Satoshi, Kimura Masashi, Tsunemi Hiroshi, Sasaki Masayuki, Uchida Daiki, Sugizaki Mutsumi
Proceedings of a conference on "Suzaku-MAXI 2014: Expanding the Frontiers of the X-ray Universe" 256 - 257 2014年9月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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The duration measurements of gamma-ray bursts observed by Suzaku WAM
Ohmori Norisuke, Yamaoka Kazutaka, Ohno Masanori, Sugita Satoshi, Akiyama Mitsuru, Kinoshita Ryuji, Nishioka Yusuke, Yamauchi Makoto, Hurley Kevin, Hanabata Yoshitaka, Tashiro Makoto
Proceedings of a conference on "Suzaku-MAXI 2014: Expanding the Frontiers of the X-ray Universe" 198 - 199 2014年9月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Use of a Charge-Injection Technique to Improve Performance of the Soft X-ray Imager aboard ASTRO-H
Nobukawa K. Kumiko, Tsuru T. Go, Nobukawa Masahiro, Tanaka Takaaki, Uchida Hiroyuki, 他16名
Proceedings of a conference on "Suzaku-MAXI 2014: Expanding the Frontiers of the X-ray Universe" 196 - 197 2014年9月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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MAXI: all-sky observation from the International Space Station 査読あり
Mihara Tatehiro, Sugizaki Mutsumi, Matsuoka Masaru, Tomida Hiroshi, Ueno Shiro, Negoro Hitoshi, Yoshida Atsumasa, Tsunemi Hiroshi, Nakajima Motoki, Ueda Yoshihiro, Yamauchi Makoto
Proceedings of SPIE Conference 9144 ( 914410 ) 2014年7月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
DOI： 10.1117/12.2055792
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The ASTRO-H X-ray astronomy satellite 査読あり
Takahashi Tadayuki, Mitsuda Kazuhisa, Kelley Richard, Aharonian Felix, Akamatsu Hiroki, 他243名
Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series 9144 914425-1 - 914425-24 2014年7月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Soft X-ray Imager (SXI) onboard ASTRO-H 査読あり
Hayashida Kiyoshi, Tsunemi Hiroshi, Tsuru G. Takeshi G, Dotani Tadayasu, Nakajima Hiroshi, 他24名
Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series 9144 914429-1 - 914429-8 2014年7月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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All-sky observations by Suzaku wide-band all-sky monitor
M. Ohno, Y. Hanabata, T. Kawano, K. Takaki, R. Nakamura, 他24名
Memorie della Societa Astronomica Italiana 84 735 - 736 2013年12月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Proton radiation damage experiment on P-Channel CCD for an X-ray CCD camera onboard the ASTRO-H satellite 査読あり
K. Mori, Y. Nishioka, S. Ohura, Y. Koura, M. Yamauchi, 他14名
Nuclear Instruments and Methods in Physics Research A 731 160 - 165 2013年12月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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The 37 Month MAXI/GSC Source Catalog of the High Galactic-Latitude Sky 査読あり
K. Hiroi, Y. Ueda, M. Hayashida, M. Shidatsu, R. Sato, 他38名
The Astrophysical Journal Supplement Series 207 ( 2 ) 36-1 - 36-12 2013年8月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Spectral Evolution of a New X-Ray Transient MAXI J0556-332 Observed by MAXI, Swift, and RXTE 査読あり
M. Sugizaki, K. Yamaoka, M. Matsuoka, J. A. Kennea, T. Mihara, 他29名
Publications of the Astronomical Society of Japan 65 58-1 - 58-14 2013年6月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）