AGN jet feedback on a moving mesh: lobe energetics and X-ray properties in a realistic cluster environment
AGN jet feedback on a moving mesh: lobe energetics and X-ray properties in a realistic cluster environment
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DOI：
10.1093/mnras/stz2604
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发表时间：
2019-01
影响因子：
4.8
通讯作者：
M. Bourne;D. Sijacki;E. Puchwein
中科院分区：
文献类型：
--
作者：
M. Bourne;D. Sijacki;E. Puchwein
来自最亮星系团中活动星系核的喷流反馈在调节团内介质的冷却过程中起着重要作用。虽然观测和理论表明喷流叶内的能量平衡了ICM的辐射损失，但与ICM的能量通信方式仍不清楚。我们提出了非常高的分辨率活动星系核驱动的喷气发动机在一个活的，宇宙学星系团，在移动网格代码arepo的模拟。当喷流通过ICM传播时，它的大部分能量，最初是以动能的形式，通过内部激波迅速热化，并使非常热的气体膨胀。喷流有效地加热了星团核心，PdV功和天气辅助的混合是从叶瓣到ICM的能量传递的主要渠道，而强激波和湍流是次要的。我们还提出了详细的模拟X射线地图在不同阶段的演变，揭示了清晰的腔体周围的X射线明亮的轮辋，与叶可检测到高达108年，即使当磁披覆是无效的。我们发现，在集群中的批量运动可以显着影响波瓣传播，抵消他们从射流方向，并赋予批量速度，可以占主导地位的conventantly上升的运动。
Jet feedback from active galactic nuclei (AGN) harboured by brightest cluster galaxies is expected to play a fundamental role in regulating cooling in the intracluster medium (ICM). While observations and theory suggest energy within jet lobes balances ICM radiative losses, the modus operandi of energy communication with the ICM remains unclear. We present simulations of very high resolution AGN-driven jets launching in a live, cosmological galaxy cluster, within the moving mesh code arepo. As the jet propagates through the ICM the majority of its energy, which is initially in the kinetic form, thermalizes quickly through internal shocks and inflates lobes of very hot gas. The jets effectively heat the cluster core, with PdV work and weather-aided mixing being the main channels of energy transfer from the lobes to the ICM, while strong shocks and turbulence are subdominant. We additionally present detailed mock X-ray maps at different stages of evolution, revealing clear cavities surrounded by X-ray bright rims, with lobes being detectable for up to ∼108 yr even when magnetic draping is ineffective. We find bulk motions in the cluster can significantly affect lobe propagation, offsetting them from the jet direction and imparting bulk velocities that can dominate over the buoyantly rising motion.