题 目: Dark Matter Substructure in the Simulations and Observed Universe

报告人：Dr. Pasi Nurmi

University of Turku, Tuorla Observatory, Finland

Abstract Cosmological dark matter N-body simulations are widely used to create mock-catalogues of galaxies. In this talk I review the main ideas and problems behind such simulations and show some results where Sloan Digital Sky Survey (SDSS) DR6 galaxy catalog and simulated galaxy data are used to study the substructure of the dark matter halos, the distribution of subhalos inside main halos and the correspondence between dark matter halos and galaxies. The main assumption is that each subhalo contains a galaxy and the simple analytical equation can be used to assign luminosities for dark matter halos. By comparing the properties of galaxy groups in SDSS and simulations the hypothesis that galaxies are formed within large halos in a similar manner as subhalos are formed inside main halos can be tested.

时 间：2008年7月23日（星期三），上午10:30

地 点：（北京西路2号）紫台大楼3楼327会议室

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紫金山天文台学术委员会学术交流工作委员会

2008年7月11日