GRK 787: Galaxy Groups as Laboratories for Baryonic and Dark Matter

宇宙从大爆炸到现在的结构形成的物理过程，到目前为止，在很大程度上是未知的。主要的研究课题涉及观测到的各种星系性质的形成和暗物质的性质。在这种情况下，星系群——小的、受引力束缚的星系及其卫星的聚集体——起着特殊的作用。与质量大得多的星系团相反，星系群的演化程度较低，并且受单个事件的支配。这意味着可以详细研究重力相互作用和与群间介质相互作用等进化效应。星系群也是我们理解结构形成的重要系统，因为它们是原始密度分布的低密度峰。

The physical processes of structure formation in the Universe from Big Bang to the present time are largely unkown up to now. Mayor research topics concern the formation of the observed large variety of galaxy properties and the nature of dark matter. In this context especially galaxy groups - small, gravitationally bound aggregates of galaxies and their satellites - play a special role. Galaxy groups are, contrary to the much more massive galaxy clusters, lessevolved and dominated by individual events. This implies that the evolutionary effects like gravitational interaction and interaction with the intergroup medium can be studied in detail. Galaxy groups are also important systems for our understanding of structure formation since they sample the lower density peaks of the primoridal density distribution.