Evidence for AGN Feedback in Galaxy Clusters and Groups

Evidence for AGN Feedback in Galaxy Clusters and Groups
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星系团和星系团中活动星系核反馈的证据

DOI:
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发表时间:
2011
期刊:
影响因子:
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通讯作者:
B. McNamara
B. McNamara
中科院分区:
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文献类型:
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作者:
M. Gitti;F. Brighenti;B. McNamara

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当前一代的旗舰x射线任务,钱德拉和xmm -牛顿,已经改变了我们对所谓的“冷核”星系团和星群的理解。与最初的热气体冷却并流向中心的想法不同,新的图像设想了一个复杂的星系团内介质(ICM)的动态演化,由辐射冷却和来自活动星系核(AGN)的非引力加热调节。了解热气体的物理特性及其与AGN喷射出的相对论性等离子体的相互作用,对于理解星系及其中心黑洞的生长和演化、恒星形成的历史以及大尺度结构的形成至关重要。因此,很明显,在任何星系演化模型中都必须考虑到来自中心黑洞的反馈。在本文中,我们通过总结该领域的最新成果,对AGN反馈对ICM的影响的当前知识进行了定性描述。
The current generation of flagship X-ray missions, Chandra and XMM-Newton, has changed our understanding of the so-called “cool-core” galaxy clusters and groups. Instead of the initial idea that the thermal gas is cooling and flowing toward the center, the new picture envisages a complex dynamical evolution of the intracluster medium (ICM) regulated by the radiative cooling and the nongravitational heating from the active galactic nucleus (AGN). Understanding the physics of the hot gas and its interplay with the relativistic plasma ejected by the AGN is key for understanding the growth and evolution of galaxies and their central black holes, the history of star formation, and the formation of large-scale structures. It has thus become clear that the feedback from the central black hole must be taken into account in any model of galaxy evolution. In this paper, we draw a qualitative picture of the current knowledge of the effects of the AGN feedback on the ICM by summarizing the recent results in this field.
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