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arxiv: 1711.00240 · v1 · pith:6CTZCE3Inew · submitted 2017-11-01 · 🌌 astro-ph.HE

Atmospheric gas dynamics in the Perseus cluster observed with Hitomi

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

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