探索宇宙学shock waves在星系团Dianoga模拟中的作用
Exploring the role of cosmological shock waves in the Dianoga simulations of galaxy clusters
摘要：
宇宙冲击波在宇宙结构的形成和演化中无处不在。因此，它们在星系际介质（IGM）的能量分布和热化中起着重要作用。我们分析的马赫数分布的Dianoga模拟的星系团与SPH代码GADGET-3。模拟包括辐射冷却、恒星形成、金属富集、超新星和活动星系核反馈的影响。一个基于网格的冲击发现算法应用于后处理的模拟输出。这一过程使我们能够详细地探索受冲击细胞的分布及其强度作为集群质量，红移和重子物理的函数。我们还特别关注了冲击波与冷核/非冷核（CC/NCC）态之间的联系以及模拟团簇的整体动力学状态。在一般的冲击统计方面，我们得到了广泛的协议与以前的作品，弱（低马赫数）冲击填充大部分的体积和处理大部分的总热能通量。作为集群质量的函数，我们发现，大规模的集群似乎更有效的热化IGM，往往表现出更大的外部吸积冲击比小规模的系统。我们没有发现任何相关的差异CC和NCC集群。然而，我们发现一个温和的依赖性的径向分布的冲击马赫数上的集群动力学状态，与干扰系统表现出更强的冲击比规则的整个集群体积。
英文摘要：
Cosmological shock waves are ubiquitous to cosmic structure formation and evolution. As a consequence, they play a major role in the energy distribution and thermalization of the intergalactic medium (IGM). We analyze the Mach number distribution in the Dianoga simulations of galaxy clusters performed with the SPH code GADGET-3. The simulations include the effects of radiative cooling, star formation, metal enrichment, supernova and active galactic nuclei feedback. A grid-based shock-finding algorithm is applied in post-processing to the outputs of the simulations. This procedure allows us to explore in detail the distribution of shocked cells and their strengths as a function of cluster mass, redshift and baryonic physics. We also pay special attention to the connection between shock waves and the cool-core/non-cool core (CC/NCC) state and the global dynamical status of the simulated clusters. In terms of general shock statistics, we obtain a broad agreement with previous works, with weak (low-Mach number) shocks filling most of the volume and processing most of the total thermal energy flux. As a function of cluster mass, we find that massive clusters seem more efficient in thermalising the IGM and tend to show larger external accretion shocks than less massive systems. We do not find any relevant difference between CC and NCC clusters. However, we find a mild dependence of the radial distribution of the shock Mach number on the cluster dynamical state, with disturbed systems showing stronger shocks than regular ones throughout the cluster volume.
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