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Atmospheric gas dynamics in the Perseus cluster observed with Hitomi

2017; Oxford University Press; Volume: 70; Issue: 2 Linguagem: Inglês

10.1093/pasj/psx138

2053-051X

F. Aharonian, Hiroki Akamatsu, Fumie Akimoto, S. W. Allen, L. Angelini, M. Audard, Hisamitsu Awaki, M. Axelsson, Aya Bamba, M. Bautz, R. D. Blandford, Laura Brenneman, G. V. Brown, Esra Bülbül, Edward Cackett, Rebecca E. A. Canning, M. Chernyakova, Meng P. Chiao, P. Coppi, E. Costantini, J. de Plaa, C. P. de Vries, Jan-Willem den Herder, Chris Done, Tadayasu Dotani, K. Ebisawa, Megan E. Eckart, Teruaki Enoto, Yuichiro Ezoe, Andrew C Fabian, C. Ferrigno, Adam R Foster, Ryuichi Fujimoto, Yasushi Fukazawa, Akihiro Furuzawa, Massimiliano Galeazzi, Luigi Gallo, Poshak Gandhi, M. Giustini, A. Goldwurm, Liyi Gu, M. Guainazzi, Yoshito Haba, Kouichi Hagino, Kenji Hamaguchi, I. Harrus, Isamu Hatsukade, Katsuhiro Hayashi, Takayuki Hayashi, Tasuku Hayashi, Kiyoshi Hayashida, Junko S. Hiraga, A. E. Hornschemeier, Akio Hoshino, John P. Hughes, Yuto Ichinohe, Ryo Iizuka, Hajime Inoue, Shota Inoue, Yoshiyuki Inoue, M. Ishida, Kumi Ishikawa, Yoshitaka Ishisaki, Masachika Iwai, J. S. Kaastra, Tim Kallman, T. Kamae, J. Kataoka, Satoru Katsuda, N. Kawai, Richard L Kelley, Caroline A Kilbourne, Takao Kitaguchi, Shunji Kitamoto, Tetsu Kitayama, Takayoshi Kohmura, M. Kokubun, Katsuji Koyama, Shu Koyama, P. Kretschmar, H. Krimm, Aya Kubota, Hideyo Kunieda, Philippe Laurent, S.-H. Lee, Maurice A. Leutenegger, Olivier Limousin, Michael Loewenstein, Knox S. Long, David H. Lumb, G. M. Madejski, Yoshitomo Maeda, Daniel Maier, Kazuo Makishima, M. Markevitch, Hironori Matsumoto, Kyoko Matsushita, D. McCammon, Brian R McNamara, M. Mehdipour, Eric D. Miller, J. M. Mïller, Shin Mineshige, Kazuhisa Mitsuda, Ikuyuki Mitsuishi, Takuya Miyazawa, Tsunefumi Mizuno, Hideyuki Mori, Koji Mori, K. Mukai, Hiroshi Murakami, R. F. Mushotzky, Takao Nakagawa, Hiroshi Nakajima, Takeshi Nakamori, Shinya Nakashima, K. Nakazawa, Kumiko K Nobukawa, Masayoshi Nobukawa, Hirofumi Noda, Hirokazu Odaka, Takaya Ohashi, M. Ohno, Takashi Okajima, Naomi Ota, Masanori Ozaki, F. Paerels, Stéphane Paltani, Robert Petre, C. Pinto, Frederick S Porter, K. Pottschmidt, C. S. Reynolds, Samar Safi‐Harb, Shinya Saito, Kazuhiro Sakai, Toru Sasaki, Goro Sato, Kosuke Sato, Rie Sato, Makoto Sawada, N. Schartel, Peter J Serlemtsos, Hiromi Seta, M. Shidatsu, A. Simionescu, Randall K Smith, Yang Soong, Ł. Stawarz, Y. Sugawara, Satoshi Sugita, Andrew E. Szymkowiak, H. Tajima, H. Takahashi, Tadayuki Takahashi, Shin’ichiro Takeda, Yoh Takei, Toru Tamagawa, Takayuki Tamura, Keigo Tanaka, T. Tanaka, Yasuo Tanaka, Yasuyuki T Tanaka, Makoto S Tashiro, Yuzuru Tawara, Y. Terada, Yuichi Terashima, Francesco Tombesi, Hiroshi Tomida, Yohko Tsuboi, Masahiro Tsujimoto, H. Tsunemi, Takeshi Go Tsuru, Hiroyuki Uchida, Hideki Uchiyama, Y. Uchiyama, Shutaro Ueda, Yoshihiro Ueda, Shin’ichiro Uno, C. M. Urry, Eugenio Ursino, Qian H. S. Wang, Shin Watanabe, Norbert Werner, D. R. Wilkins, Brian J Williams, S. Yamada, Hiroya Yamaguchi, K. Yamaoka, Noriko Y. Yamasaki, M. Yamauchi, Shigeo Yamauchi, Tahir Yaqoob, Yoichi Yatsu, Daisuke Yonetoku, Irina Zhuravleva, Abderahmen Zoghbi,

Astrophysical Phenomena and Observations

Extending the earlier measurements reported in Hitomi collaboration (2016, Nature, 535, 117), we examine the atmospheric gas motions within the central 100~kpc of the Perseus cluster using observations obtained with the Hitomi satellite. After correcting for the point spread function of the telescope and using optically thin emission lines, we find that the line-of-sight velocity dispersion of the hot gas is remarkably low and mostly uniform. The velocity dispersion reaches maxima of approximately 200~km~s$^{-1}$ toward the central active galactic nucleus (AGN) and toward the AGN inflated north-western `ghost' bubble. Elsewhere within the observed region, the velocity dispersion appears constant around 100~km~s$^{-1}$. We also detect a velocity gradient with a 100~km~s$^{-1}$ amplitude across the cluster core, consistent with large-scale sloshing of the core gas. If the observed gas motions are isotropic, the kinetic pressure support is less than 10\% of the thermal pressure support in the cluster core. The well-resolved optically thin emission lines have Gaussian shapes, indicating that the turbulent driving scale is likely below 100~kpc, which is consistent with the size of the AGN jet inflated bubbles. We also report the first measurement of the ion temperature in the intracluster medium, which we find to be consistent with the electron temperature. In addition, we present a new measurement of the redshift to the brightest cluster galaxy NGC~1275.