表征星系团中的体运动和湍流气体运动
Characterizing the bulk and turbulent gas motions in galaxy clusters
摘要：
宇宙中最大质量的物质晕是通过整个宇宙时代的吸积和合并事件而形成的。这些剧烈的过程在许多尺度上产生冲击，并引起大尺度的整体和湍流运动。这些过程在大尺度上注入动能，这些动能被输送到粘性耗散尺度，有助于整体加热和维里化的晕，并作为一个来源的非热压力在集群内的介质。描述这些气体运动的物理性质将有助于我们更好地理解质量晕的组装，从而理解这些大尺度结构的形成和演化。我们的基础上的X射线和Sunyaev-Zel'dovich效应的亮度波动的研究这一特性。我们的工作依赖于三个互补的样本，涵盖了广泛的红移，质量和动力学状态的集群。我们提出了我们的X射线分析的结果，低红移的样品，X-COP，和一个子样本的高红移集群。我们调查派生的属性，根据我们的集群的动力学状态，和重建的气体运动功率谱和各种形态指标的相关性的基础上的自相似行为的可能性。
英文摘要：
The most massive halos of matter in the Universe grow via accretion and merger events throughout cosmic times. These violent processes generate shocks at many scales and induce large-scale bulk and turbulent motions. These processes inject kinetic energy at large scales, which is transported to the viscous dissipation scales, contributing to the overall heating and virialisation of the halo, and acting as a source of non-thermal pressure in the intra-cluster medium. Characterizing the physical properties of these gas motions will help us to better understand the assembly of massive halos, hence the formation and the evolution of these large-scale structures. We base this characterization on the study of the X-ray and Sunyaev-Zel'dovich effect brightness fluctuations. Our work relies on three complementary samples covering a wide range of redshifts, masses and dynamical states of clusters. We present the results of our X-ray analysis for the low redshift sample, X-COP, and a subsample of higher redshift clusters. We investigate the derived properties according to the dynamical state of our clusters, and the possibility of a self-similar behaviour based on the reconstructed gas motions power-spectra and the correlation with various morphological indicators.
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