Atmospheric gas dynamics in the Perseus cluster observed with Hitomi
Abstract
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 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. We also detect a velocity gradient with a 100~km~s 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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Cite
@article{arxiv.1711.00240,
title = {Atmospheric gas dynamics in the Perseus cluster observed with Hitomi},
author = {Hitomi Collaboration and Felix Aharonian and Hiroki Akamatsu and Fumie Akimoto and Steven W. Allen and Lorella Angelini and Marc Audard and Hisamitsu Awaki and Magnus Axelsson and Aya Bamba and Marshall W. Bautz and Roger Blandford and Laura W. Brenneman and Gregory V. Brown and Esra Bulbul and Edward M. Cackett and Rebecca E. A. Canning and Maria Chernyakova and Meng P. Chiao and Paolo S. Coppi and Elisa Costantini and Jelle de Plaa and Cor P. de Vries and Jan-Willem den Herder and Chris Done and Tadayasu Dotani and Ken Ebisawa and Megan E. Eckart and Teruaki Enoto and Yuichiro Ezoe and Andrew C. Fabian and Carlo Ferrigno and Adam R. Foster and Ryuichi Fujimoto and Yasushi Fukazawa and Akihiro Furuzawa and Massimiliano Galeazzi and Luigi C. Gallo and Poshak Gandhi and Margherita Giustini and Andrea Goldwurm and Liyi Gu and Matteo Guainazzi and Yoshito Haba and Kouichi Hagino and Kenji Hamaguchi and Ilana M. Harrus and Isamu Hatsukade and Katsuhiro Hayashi and Takayuki Hayashi and Tasuku Hayashi and Kiyoshi Hayashida and Junko S. Hiraga and Ann Hornschemeier and Akio Hoshino and John P. Hughes and Yuto Ichinohe and Ryo Iizuka and Hajime Inoue and Shota Inoue and Yoshiyuki Inoue and Manabu Ishida and Kumi Ishikawa and Yoshitaka Ishisaki and Masachika Iwai and Jelle Kaastra and Tim Kallman and Tsuneyoshi Kamae and Jun Kataoka and Satoru Katsuda and Nobuyuki Kawai and Richard L. Kelley and Caroline A. Kilbourne and Takao Kitaguchi and Shunji Kitamoto and Tetsu Kitayama and Takayoshi Kohmura and Motohide Kokubun and Katsuji Koyama and Shu Koyama and Peter Kretschmar and Hans A. Krimm and Aya Kubota and Hideyo Kunieda and Philippe Laurent and Shiu-Hang Lee and Maurice A. Leutenegger and Olivier Limousin and Michael Loewenstein and Knox S. Long and David Lumb and Greg Madejski and Yoshitomo Maeda and Daniel Maier and Kazuo Makishima and Maxim Markevitch and Hironori Matsumoto and Kyoko Matsushita and Dan McCammon and Brian R. McNamara and Missagh Mehdipour and Eric D. Miller and Jon M. Miller and Shin Mineshige and Kazuhisa Mitsuda and Ikuyuki Mitsuishi and Takuya Miyazawa and Tsunefumi Mizuno and Hideyuki Mori and Koji Mori and Koji Mukai and Hiroshi Murakami and Richard F. Mushotzky and Takao Nakagawa and Hiroshi Nakajima and Takeshi Nakamori and Shinya Nakashima and Kazuhiro Nakazawa and Kumiko K. Nobukawa and Masayoshi Nobukawa and Hirofumi Noda and Hirokazu Odaka and Takaya Ohashi and Masanori Ohno and Takashi Okajima and Naomi Ota and Masanobu Ozaki and Frits Paerels and Stéphane Paltani and Robert Petre and Ciro Pinto and Frederick S. Porter and Katja Pottschmidt and Christopher S. Reynolds and Samar Safi-Harb and Shinya Saito and Kazuhiro Sakai and Toru Sasaki and Goro Sato and Kosuke Sato and Rie Sato and Makoto Sawada and Norbert Schartel and Peter J. Serlemtsos and Hiromi Seta and Megumi Shidatsu and Aurora Simionescu and Randall K. Smith and Yang Soong and Łukasz Stawarz and Yasuharu Sugawara and Satoshi Sugita and Andrew Szymkowiak and Hiroyasu Tajima and Hiromitsu Takahashi and Tadayuki Takahashi and Shin'ichiro Takeda and Yoh Takei and Toru Tamagawa and Takayuki Tamura and Keigo Tanaka and Takaaki Tanaka and Yasuo Tanaka and Yasuyuki T. Tanaka and Makoto S. Tashiro and Yuzuru Tawara and Yukikatsu Terada and Yuichi Terashima and Francesco Tombesi and Hiroshi Tomida and Yohko Tsuboi and Masahiro Tsujimoto and Hiroshi Tsunemi and Takeshi Go Tsuru and Hiroyuki Uchida and Hideki Uchiyama and Yasunobu Uchiyama and Shutaro Ueda and Yoshihiro Ueda and Shin'ichiro Uno and C. Megan Urry and Eugenio Ursino and Qian H. S. Wang and Shin Watanabe and Norbert Werner and Dan R. Wilkins and Brian J. Williams and Shinya Yamada and Hiroya Yamaguchi and Kazutaka Yamaoka and Noriko Y. Yamasaki and Makoto Yamauchi and Shigeo Yamauchi and Tahir Yaqoob and Yoichi Yatsu and Daisuke Yonetoku and Irina Zhuravleva and Abderahmen Zoghbi},
journal= {arXiv preprint arXiv:1711.00240},
year = {2018}
}
Comments
52 pages, 16 figures, 8 tables, accepted for publication in PASJ