标题： 星系团的动态 显示英文标题

标题： Dynamics of Clusters of Galaxies

摘要： 富集团簇的丰度和内部特性可以为大尺度结构形成模型提供有用的限制。 本文将回顾一些最近的三维、多流体模拟，讨论这些模拟对来自光学和X射线观测到的富集团簇问题的影响。 在“自底向上”的形成场景（例如普遍存在的冷暗物质模型）中，星系在富集团簇之前形成；因此，团簇的形成与星系的形成密切相关，而星系的形成又与恒星的形成有关。 我将探讨两个似乎相对不受星系/恒星形成影响的问题——团簇中的重子分数以及X射线形态与$\Omega_o$的联系——最后以一个与其紧密相关的话题结束——团簇星系群体的动力学偏差。 显示英文摘要

摘要： The abundance and internal characteristics of rich clusters of galaxies can provide useful constraints on models of large--scale structure formation. This article will review some recent three dimensional, multi--fluid simulations of cluster dynamics and discuss their impact on issues raised from optical and X-ray observations of clusters. In `bottom--up' formation scenarios (such as the ubiquitous cold dark matter model), galaxies form before rich clusters; hence, cluster formation is intimately linked to galaxy formation which, in turn, is tied to star formation. I will examine two issues which appear relatively insensitive to galaxy/star formation --- the baryon fraction in clusters and the connection between X--ray morphology and $\Omega_o$ --- and end with a topic that is intimately linked to it --- dynamical biases in the cluster galaxy population.