Implications of the mild gas motion found with Hitomi in the core of the Perseus cluster
Implications of the mild gas motion found with Hitomi in the core of the Perseus cluster
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DOI：
10.1051/0004-6361/201936437
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发表时间：
2020-05
影响因子：
6.5
通讯作者：
L. Gu;K. Makishima;R. Matsumoto;K. Nakazawa;K. Shimasaku;N. Inada;T. Kodama;Haiguang Xu;M. Kawaharada
中科院分区：
文献类型：
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作者：
L. Gu;K. Makishima;R. Matsumoto;K. Nakazawa;K. Shimasaku;N. Inada;T. Kodama;Haiguang Xu;M. Kawaharada
主要基于X射线观测，研究了星系团中的星系团内介质(ICM)与其成员星系之间的相互作用。通过(磁)流体动力学和引力通道，移动的星系预计会将ICM拖曳在它们周围，然后将它们在宇宙学时间尺度上的部分动力能量转移到ICM。这一假设与几个观测结果是一致的，包括从z∼1到z∼0的红移中发现的星系可能向星系团中心的宇宙学流入。进一步假设这些星系损失的能量首先转化为ICM湍流，然后耗散，这张图片可以解释用英仙座星系团核心区的Hitomi测量的亚音速均匀ICM湍流。这一场景还可以解释其他几个关于星系团的悬而未决的问题，例如是什么阻止了ICM低于预期的辐射冷却，附近星系团中的各种质量成分如何获得不同的径向分布，以及CD星系周围共存的热和冷ICM成分之间如何实现热稳定性。这一观点也被认为与星系演化的一般情景有关，包括它们对环境的影响。
Based mainly on X-ray observations, we study the interactions between the intracluster medium (ICM) in clusters of galaxies and their member galaxies. Through (magneto)hydrodynamic and gravitational channels, moving galaxies are expected to drag the ICM around them, and then transfer some fraction of their dynamical energies on cosmological timescales to the ICM. This hypothesis is in line with several observations, including the possible cosmological infall of galaxies toward the cluster center, found over redshifts of z ∼ 1 to z ∼ 0. Further assuming that the energy lost by these galaxies is first converted into ICM turbulence and then dissipated, this picture can explain the subsonic and uniform ICM turbulence, measured with Hitomi in the core region of the Perseus cluster. The scenario may also explain several other unanswered problems regarding clusters of galaxies, such as what prevents the ICM from underoing the expected radiative cooling, how the various mass components in nearby clusters have attained different radial distributions, and how a thermal stability is realized between hot and cool ICM components that co-exist around cD galaxies. This view is also considered to pertain to the general scenario of galaxy evolution, including their environmental effects.