论文标题

GARAXY组和簇的模拟中,AGN反馈与簇内介质的降水之间的相互作用

The interplay between AGN feedback and precipitation of the intracluster medium in simulations of galaxy groups and clusters

论文作者

Nobels, Folkert S. J., Schaye, Joop, Schaller, Matthieu, Bahé, Yannick M., Chaikin, Evgenii

论文摘要

使用星系簇的高分辨率流体动力学模拟,我们研究了最亮星系,其超大质量黑洞(BH)和膨胀培养基(ICM)之间的相互作用。我们创建的初始条件是ICM在重力电势内的静水平衡和NFW暗物质光环中的静水平衡。与热力学曲线相关的两个自由参数决定了簇气分和中心温度,后者可用于创建冷核或非冷核系统。我们的模拟包括辐射冷却,恒星形成,BH积聚以及恒星和活跃的银河核(AGN)反馈。即使AGN反馈的能量被热和各向同性地注入,它也会导致各向异性流出和浮动的气泡。我们发现,BH积聚率(BHAR)是高度可变的,并且仅与恒星形成率(SFR)和ICM密切相关。我们通常认为与理论降水框架有很好的一致性。在$ 10^{13}〜\ rm m_ \ odot $ haloes中,agn反馈淬灭中央星系,并将酷核系统转换为非冷核系统。相反,高质量的较酷核心簇周期性地发展。高BHAR的发作将ICM的熵提高到半径上,其中冷却时间和局部动态时间的比率$ t _ {\ rm cool}/t _ {\ rm dyn}> 10 $,从而抑制冷凝水,从而抑制了bhar。 AGN反馈的相应减少使ICM冷却并变得不稳定,从而启动了高SFR和BHAR的新发作。

Using high-resolution hydrodynamical simulations of galaxy clusters, we study the interaction between the brightest cluster galaxy, its supermassive black hole (BH) and the intracluster medium (ICM). We create initial conditions for which the ICM is in hydrostatic equilibrium within the gravitational potential from the galaxy and an NFW dark matter halo. Two free parameters associated with the thermodynamic profiles determine the cluster gas fraction and the central temperature, where the latter can be used to create cool-core or non-cool-core systems. Our simulations include radiative cooling, star formation, BH accretion, and stellar and active galactic nucleus (AGN) feedback. Even though the energy of AGN feedback is injected thermally and isotropically, it leads to anisotropic outflows and buoyantly rising bubbles. We find that the BH accretion rate (BHAR) is highly variable and only correlates strongly with the star formation rate (SFR) and the ICM when it is averaged over more than $1~\rm Myr$. We generally find good agreement with the theoretical precipitation framework. In $10^{13}~\rm M_\odot$ haloes, AGN feedback quenches the central galaxy and converts cool-core systems into non-cool-core systems. In contrast, higher-mass, cool-core clusters evolve cyclically. Episodes of high BHAR raise the entropy of the ICM out to the radius where the ratio of the cooling time and the local dynamical time $t_{\rm cool}/t_{\rm dyn} > 10$, thus suppressing condensation and, after a delay, the BHAR. The corresponding reduction in AGN feedback allows the ICM to cool and become unstable to precipitation, thus initiating a new episode of high SFR and BHAR.

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