比较XRISM星团速度离散与宇宙模拟预测：反馈模型是否过于驱动？
星系天体物理
2025-10-13 v2
摘要
星团内等离子体(ICM)的动力学由引力驱动的星团碰撞和来自星团核心超大质量黑洞(SMBH)的反馈所塑造。XRISM对ICM速度的测量提供了关于这些过程的洞察。我们将XRISM对九个星系星团（Virgo、Perseus、Centaurus、Hydra A、PKS\,0745--19、A2029、Coma、A2319、Ophiuchus）的测量结果与来自三个最先进宇宙模拟套件的预测进行比较：TNG-Cluster、The Three Hundred Project GADGET-X和GIZMO-SIMBA，这些模拟采用不同的反馈模型。在冷核区，XRISM揭示了ICM速度离散显著低于模拟值，所有测量值均低于模拟中位数值1.5-1.7倍，全部位于预测分布的底10%。观测到的动能-总压比也较低，中位数值为，而预测值则为。在冷核区之外和非冷核星团中，模拟与XRISM测量值表现更好，除了放松的冷核星团A2029的外缘，该星团显示异常低的动力学压力支持（），而三套模拟中没有任何系统达到如此低的水平。非冷核Coma和A2319的速度离散处于模拟范围的下端但仍在模拟范围内。我们的比较表明，这三个数值模型可能高估了SMBH反馈在星团核心中的动力学效应。对非冷核星团的额外XRISM观测将澄清是否存在在引力主导的 regime中也存在系统性分歧。
引用
@article{arxiv.2510.06322,
title = {Comparing XRISM cluster velocity dispersions with predictions from cosmological simulations: are feedback models too ejective?},
author = {XRISM Collaboration and Marc Audard and Hisamitsu Awaki and Ralf Ballhausen and Aya Bamba and Ehud Behar and Rozenn Boissay-Malaquin and Laura Brenneman and Gregory V. Brown and Lia Corrales and Elisa Costantini and Renata Cumbee and Maria Diaz Trigo and Chris Done and Tadayasu Dotani and Ken Ebisawa and Megan E. Eckart and Dominique Eckert and Satoshi Eguchi and Teruaki Enoto and Yuichiro Ezoe and Adam Foster and Ryuichi Fujimoto and Yutaka Fujita and Yasushi Fukazawa and Kotaro Fukushima and Akihiro Furuzawa and Luigi Gallo and Javier A. García and Liyi Gu and Matteo Guainazzi and Kouichi Hagino and Kenji Hamaguchi and Isamu Hatsukade and Katsuhiro Hayashi and Takayuki Hayashi and Natalie Hell and Edmund Hodges-Kluck and Ann Hornschemeier and Yuto Ichinohe and Daiki Ishi and Manabu Ishida and Kumi Ishikawa and Yoshitaka Ishisaki and Jelle Kaastra and Timothy Kallman and Erin Kara and Satoru Katsuda and Yoshiaki Kanemaru and Richard Kelley and Caroline Kilbourne and Shunji Kitamoto and Shogo Kobayashi and Takayoshi Kohmura and Aya Kubota and Maurice Leutenegger and Michael Loewenstein and Yoshitomo Maeda and Maxim Markevitch and Hironori Matsumoto and Kyoko Matsushita and Dan McCammon and Brian McNamara and François Mernier and Eric D. Miller and Jon M. Miller and Ikuyuki Mitsuishi and Misaki Mizumoto and Tsunefumi Mizuno and Koji Mori and Koji Mukai and Hiroshi Murakami and Richard Mushotzky and Hiroshi Nakajima and Kazuhiro Nakazawa and Jan-Uwe Ness and Kumiko Nobukawa and Masayoshi Nobukawa and Hirofumi Noda and Hirokazu Odaka and Shoji Ogawa and Anna Ogorzałek and Takashi Okajima and Naomi Ota and Stephane Paltani and Robert Petre and Paul Plucinsky and Frederick S. Porter and Katja Pottschmidt and Kosuke Sato and Toshiki Sato and Makoto Sawada and Hiromi Seta and Megumi Shidatsu and Aurora Simionescu and Randall Smith and Hiromasa Suzuki and Andrew Szymkowiak and Hiromitsu Takahashi and Mai Takeo and Toru Tamagawa and Keisuke Tamura and Takaaki Tanaka and Atsushi Tanimoto and Makoto Tashiro and Yukikatsu Terada and Yuichi Terashima and Yohko Tsuboi and Masahiro Tsujimoto and Hiroshi Tsunemi and Takeshi Tsuru and Aysegül Tümer and Hiroyuki Uchida and Nagomi Uchida and Yuusuke Uchida and Hideki Uchiyama and Shutaro Ueda and Yoshihiro Ueda and Shinichiro Uno and Jacco Vink and Shin Watanabe and Brian J. Williams and Satoshi Yamada and Shinya Yamada and Hiroya Yamaguchi and Kazutaka Yamaoka and Noriko Yamasaki and Makoto Yamauchi and Shigeo Yamauchi and Tahir Yaqoob and Tomokage Yoneyama and Tessei Yoshida and Mihoko Yukita and Irina Zhuravleva and Weiguang Cui and Stefano Ettori and Skylar Grayson and Annie Heinrich and Hannah McCall and Dylan Nelson and Nobuhiro Okabe and Yuki Omiya and Arnab Sarkar and Evan Scannapieco and Ming Sun and Keita Tanaka and Nhut Truong and Daniel R. Wik and Congyao Zhang and John ZuHone},
journal= {arXiv preprint arXiv:2510.06322},
year = {2025}
}
备注
Accepted for publication in ApJ Letters