Self-regulation of active galactic nuclei in galaxy clusters

Self-regulation of active galactic nuclei in galaxy clusters
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星系团中活动星系核的自我调节

DOI:
10.1111/j.1365-2966.2009.15216.x
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发表时间:
2009
影响因子:
4.8
通讯作者:
Scannapieco E.
Scannapieco E.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Brüggen M;Scannapieco E.

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星系团的冷核被认为是由低能量的活动星系核(AGN)加热的,其吸积受反馈调节。然而,活动星系核喷出的热气与周围的团内介质之间的相互作用是非常难以模拟的,因为它涉及到广泛的空间尺度和瑞利-泰勒(RT)不稳定的气体。在这里,我们提出了一系列的三维流体动力学模拟星系团中的一个自我调节AGN。我们的自适应网格模拟包括辐射冷却,AGN加热和RT驱动的湍流,这是至关重要的模拟这种演变的亚网格模型的处方。活动星系核的加热被认为与聚集在星系团中心区域的静止质量能量成正比。对于广泛的反馈效率,集群调节自己至少几个109年。加热通过一系列爆发来平衡冷却,典型的复发时间约为8000万年,这一时间尺度仅取决于全球星系团的性质。在某些条件下,我们发现在金属丰度的集群内介质的中心下降。假设这里使用的亚网格模型捕捉到了它的所有关键特性,湍流在星系团核心的活动星系核的自我调节中起着至关重要的作用。
Cool cores of galaxy clusters are thought to be heated by low-power active galactic nuclei (AGN), whose accretion is regulated by feedback. However, the interaction between the hot gas ejected by the AGN and the ambient intracluster medium is extremely difficult to simulate as it involves a wide range of spatial scales and gas that is Rayleigh–Taylor (RT) unstable. Here, we present a series of three-dimensional hydrodynamical simulations of a self-regulating AGN in a galaxy cluster. Our adaptive-mesh simulations include prescriptions for radiative cooling, AGN heating and a subgrid model for RT-driven turbulence, which is crucial to simulate this evolution. AGN heating is taken to be proportional to the rest-mass energy that is accreted on to the central region of the cluster. For a wide range of feedback efficiencies, the cluster regulates itself for at least several 109yr. Heating balances cooling through a string of outbursts with typical recurrence times of around 80 Myr, a time-scale that depends only on global cluster properties. Under certain conditions, we find central dips in the metallicity of the intracluster medium. Provided the subgrid model used here captures all its key properties, turbulence plays an essential role in the AGN self-regulation in cluster cores.
DOI: 10.1111/j.1745-3933.2007.00351.x
发表时间: 2007-06
影响因子: --
作者:
M. Brueggen;S. Heinz;E. Roediger;M. Ruszkowski;A. Simionescu
通讯作者: M. Brueggen;S. Heinz;E. Roediger;M. Ruszkowski;A. Simionescu
DOI: 10.1086/341199
发表时间: 2002
期刊: The Astrophysical Journal Letters
影响因子: --
作者:
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通讯作者: M. Brüggen
遗迹无线电“气泡”和集群冷却流
DOI: 10.1046/j.1365-8711.2003.06719.x
发表时间: 2003
影响因子: 4.8
作者:
D. Young
通讯作者: D. Young
DOI: 10.1038/nature07169
发表时间: 2008-08
期刊: Nature
影响因子: 64.8
作者:
A. Fabian;R. Johnstone;J. Sanders;C. Conselice;C. S. Crawford;J. Gallagher;E. I. O. Astronomy;Cambridge;U. Nottingham;U. Wisconsin
通讯作者: A. Fabian;R. Johnstone;J. Sanders;C. Conselice;C. S. Crawford;J. Gallagher;E. I. O. Astronomy;Cambridge;U. Nottingham;U. Wisconsin
来自活动星系核的热气泡作为冷却流星团的热源
DOI: 10.1038/nature00857
发表时间: 2002
期刊: Nature
影响因子: 64.8
作者:
M. Brüggen;C. Kaiser
通讯作者: C. Kaiser