Self-regulation of active galactic nuclei in galaxy clusters
Self-regulation of active galactic nuclei in galaxy clusters
复制标题
星系团中活动星系核的自我调节
DOI:
10.1111/j.1365-2966.2009.15216.x
复制
发表时间:
2009
影响因子:
4.8
通讯作者:
Scannapieco E.
中科院分区:
文献类型:
--
作者:
Brüggen M;Scannapieco E.
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.
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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:
M. Brüggen
通讯作者:
M. Brüggen
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
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
影响因子:
64.8
作者:
M. Brüggen;C. Kaiser
通讯作者:
C. Kaiser