弛豫星系团中喷流膨胀茧的能量碰撞
Energetic Impact of Jet Inflated Cocoons in Relaxed Galaxy Clusters
摘要：
来自星系团核心的活动星系核（AGN）喷流有可能成为团内介质（ICM）能量收支的主要贡献者。为了研究AGN喷流和ICM之间的相互作用对喷流本身参数的依赖性，我们提出了一个参数调查的二维（轴对称）理想流体动力学模型的背靠背喷流注入到集群大气（具有不同的马赫数和动力学光度）。我们遵循的被动演变所产生的结构的几倍以上的主动寿命的喷气机。模拟大致分为两类，茧有界和非茧有界源。我们建议这两个类之间的对应关系和Faranoff-Riley类型。我们发现，茧束缚源注入显着更多的熵到ICM大气的核心区域，即使与能量热化的效率是独立的形态类。在所有情况下，由于大气的膨胀，喷流注入的能量的很大一部分（50- 80%）最终成为重力势能。
英文摘要：
Jets from active galactic nuclei (AGN) in the cores of galaxy clusters have the potential to be a major contributor to the energy budget of the intracluster medium (ICM). To study the dependence of the interaction between the AGN jets and the ICM on the parameters of the jets themselves, we present a parameter survey of two-dimensional (axisymmetric) ideal hydrodynamic models of back-to-back jets injected into a cluster atmosphere (with varying Mach numbers and kinetic luminosities). We follow the passive evolution of the resulting structures for several times longer than the active lifetime of the jet. The simulations fall into roughly two classes, cocoon-bounded and non-cocoon bounded sources. We suggest a correspondence between these two classes and the Faranoff-Riley types. We find that the cocoon-bounded sources inject significantly more entropy into the core regions of the ICM atmosphere, even though the efficiency with which energy is thermalized is independent of the morphological class. In all cases, a large fraction (50--80%) of the energy injected by the jet ends up as gravitational potential energy due to the expansion of the atmosphere.
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