用 Hitomi 观测的英仙座星系团中的大气气体动力学
高能天体物理现象
2018-04-25 v1
摘要
在 Hitomi 合作组(2016, Nature, 535, 117)早先报道的测量基础上,我们利用 Hitomi 卫星的观测检验了英仙座星系团中心 100~kpc 内的大气气体运动。在修正望远镜的点扩散函数并使用光学薄发射线后,我们发现热气体的视线速度弥散度极低且基本均匀。速度弥散度在朝向中心活动星系核(AGN)以及 AGN 膨胀的西北向‘幽灵’气泡处达到约 200~km~s 的最大值。在观测区域的其他地方,速度弥散度似乎恒定在约 100~km~s。我们还探测到一个跨星系团核心、振幅为 100~km~s 的速度梯度,与核心气体的大规模晃动一致。若观测到的气体运动各向同性,则动力学压力支撑小于团核心热压力支撑的 10%。分辨良好的光学薄发射线具有高斯形状,表明湍流驱动尺度可能低于 100~kpc,这与 AGN 喷流膨胀气泡的尺寸一致。我们还报道了星系团内介质中离子温度的首次测量,发现其与电子温度一致。此外,我们给出了到最亮团星系 NGC~1275 红移的新测量。
引用
@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}
}
备注
52 pages, 16 figures, 8 tables, accepted for publication in PASJ