重力加热，结块，过热
Gravitational heating, clumps, overheating
摘要：
解决冷却流团的过冷问题，周围并不缺乏能源。活动星系核和引力能都有足够的能量来平衡星系团核心的冷却。挑战在于如何足够有效地将这种能量与重子耦合，并以不与金属性和熵分布的观测约束相矛盾的方式分配能量。在这里，我们提出，如果一小部分的重子，是在集群晕吸积的冷块的形式，他们将通过流体动力学阻力与热气体成分相互作用。我们发现，这种团块携带足够的能量，渗透到中心，并显着加热核心。然后，我们研究了集团的动态响应，这种加热使用的一维流体动力学模拟与亚格子集团加热，并产生合理的熵分布在一个动态的自洽的方式。
英文摘要：
There is no shortage of energy around to solve the overcooling problem of cooling flow clusters. AGNs, as well as gravitational energy are both energetic enough to balance the cooling of cores of clusters. The challenge is to couple this energy to the baryons efficiently enough, and to distribute the energy in a manner that will not contradict observational constraints of metalicity and entropy profiles. Here we propose that if a small fraction of the baryons that are accreted to the cluster halo are in the form of cold clumps, they would interact with the hot gas component via hydrodynamic drag. We show that such clumps carry enough energy, penetrate to the center, and heat the core significantly. We then study the dynamic response of the cluster to this kind of heating using a 1D hydrodynamic simulation with sub-grid clump heating, and produce reasonable entropy profile in a dynamic self-consistent way.
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