Non-Kolmogorov turbulence in multiphase intracluster medium driven by cold gas precipitation and AGN jets
Non-Kolmogorov turbulence in multiphase intracluster medium driven by cold gas precipitation and AGN jets
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冷气体降水和 AGN 射流驱动的多相簇内介质中的非柯尔莫哥洛夫湍流
DOI：
10.1093/mnras/stab966
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发表时间：
2021
影响因子：
4.8
通讯作者：
Yang, H-Y K
中科院分区：
文献类型：
--
作者：
Wang, C;Ruszkowski, M;Pfrommer, C;Oh, S Peng;Yang, H-Y K
活动星系核(AGNs)反馈负责维持椭圆星系和星系团扩展晕中等离子体的全球热平衡。热气体中的局部热不稳定导致了降水冷气云的形成，这些云供给中央超大质量黑洞，从而加热热气体，维持全球热平衡。我们对类英仙星系团中的自调节活动星系核反馈进行了三维磁流体动力学(MHD)模拟，目的是了解反馈物理对星系团内介质(ICM)冷热相湍流性质的影响。我们发现，总体上，冷相速度结构函数(VSF)比Kolmogorov理论的预测值更陡峭。我们将冷相VSF的陡坡的物理起源归因于湍流运动的驱动，主要是作用于弹道云的重力加速。我们证明，在纯流体动力学的情况下，冷丝的析出可能是驱动热ICM中湍流的主要因素。支持这一假设的论点是：(I)在冷核内部，冷相质量比热气质量占优势；(Ii)热和冷气体速度在空间上是相关的；(Iii)冷相和热相速度分布都是径向偏向的。结果表明，在MHD情况下，环境热介质(不包括喷流锥区)中的湍流也可以由AGN喷流驱动。然后，由于环境气体和AGN射流的磁场，通过增强耦合来促进驱动。因此，在MHD情况下，湍流可能是由AGN射流搅拌和细丝运动共同驱动的。我们的结论是，未来的观测，包括来自高空间和光谱分辨率X射线任务的观测，可能有助于通过量化ICM中的多温度VSF来限制自主调节的活动星系核反馈。
Active galactic nuclei (AGNs) feedback is responsible for maintaining plasma in global thermal balance in extended haloes of elliptical galaxies and galaxy clusters. Local thermal instability in the hot gas leads to the formation of precipitating cold gas clouds that feed the central supermassive black holes, thus heating the hot gas and maintaining global thermal equilibrium. We perform 3D magnetohydrodynamical (MHD) simulations of self-regulated AGNs feedback in a Perseus-like galaxy cluster with the aim of understanding the impact of the feedback physics on the turbulence properties of the hot and cold phases of the intracluster medium (ICM). We find that, in general, the cold phase velocity structure function (VSF) is steeper than the prediction from Kolmogorov’s theory. We attribute the physical origin of the steeper slope of the cold phase VSF to the driving of turbulent motions primarily by the gravitational acceleration acting on the ballistic clouds. We demonstrate that, in the pure hydrodynamical case, the precipitating cold filaments may be the dominant agent driving turbulence in the hot ICM. The arguments in favour of this hypothesis are that: (i) the cold phase mass dominates over hot gas mass in the inner cool core; (ii) hot and cold gas velocities are spatially correlated; (iii) both the cold and hot phase velocity distributions are radially biased. We show that, in the MHD case, the turbulence in the ambient hot medium (excluding the jet cone regions) can also be driven by the AGN jets. The driving is then facilitated by enhanced coupling due to magnetic fields of the ambient gas and the AGN jets. In the MHD case, turbulence may thus be driven by a combination of AGN jet stirring and filament motions. We conclude that future observations, including those from high spatial and spectral resolution X-ray missions, may help to constrain self-regulated AGN feedback by quantifying the multitemperature VSF in the ICM.
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影响因子：
6.5
作者：
V. Olivares;P. Salom'e;F. Combes;S. Hamer;P. Guillard;M. Lehnert;F. Polles;R. Beckmann;Y. Dubois;M. Donahue;A. Edge;A. Fabian;B. McNamara;T. Rose;H. Russell;G. Tremblay;A. Vantyghem;R. Canning;G. Ferland;B. Godard;M. Hogan;S. Peirani;G. Forêts
通讯作者：
V. Olivares;P. Salom'e;F. Combes;S. Hamer;P. Guillard;M. Lehnert;F. Polles;R. Beckmann;Y. Dubois;M. Donahue;A. Edge;A. Fabian;B. McNamara;T. Rose;H. Russell;G. Tremblay;A. Vantyghem;R. Canning;G. Ferland;B. Godard;M. Hogan;S. Peirani;G. Forêts
FLASH 3.0简介，及其在超音速湍流中的应用
影响因子：
2.9
作者：
A Dubey;L. Reid;R. Fisher
通讯作者：
R. Fisher
影响因子：
4.8
作者：
M. Bourne;D. Sijacki;E. Puchwein
通讯作者：
M. Bourne;D. Sijacki;E. Puchwein
DOI：
10.1088/0004-637x/780/1/99
发表时间：
2013
期刊：
The Astrophysical Journal
影响因子：
--
作者：
H. Yoo;Jungyeon Cho
通讯作者：
Jungyeon Cho
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