星系的暗晕占据分布模型  

The halo occupation distribution model for galaxies

作　　者：郭宏[1] 

机构地区：[1]中国科学院上海天文台,上海200030

出　　处：《中国科学：物理学、力学、天文学》2017年第4期48-56,共9页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家自然科学基金(编号:11543003)资助项目

摘　　要：从星系巡天的观测中可以测量宇宙中星系的分布,而这些我们观测到的可见物质只占据了宇宙组分的很小一部分.如何从观测的星系分布来联系暗物质分布,建立星系与暗晕之间的关联,从而限制宇宙学参数,一直都是星系宇宙学研究领域的一大课题.本文具体介绍了描述星系空间分布的暗晕占据分布模型的主要框架和参数形式,并介绍了模型的一个简单应用.这个模型被广泛用于解释观测到的星系分布的两点相关函数,通过模型构建星系和暗晕之间关联,可以从理论上获得不同星系样本所在暗晕质量分布的信息,这对于我们理解星系形成与演化模型以及限制宇宙学参数都有着重要的意义.We can measure the galaxy distribution in the universe from the observation of the galaxy surveys. However, the baryon component only occupies a small fraction of the universe. An important topic in the research field of galaxy formation and evolution is relating the galaxy distribution to that of the underlying dark matter, building up the connection between galaxies and the dark matter halos, and then constraining the cosmology. In this review, I will introduce the framework and detailed parameterizations of the halo occupation distribution model that is used to describe the galaxy phase-space distribution. This model is commonly used to interpret the observed galaxy two-point correlation function and theoretically obtain the halo mass information for different galaxy samples through modeling the connection between galaxies and halos.Therefore, the application of this model is of great importance in the understanding the galaxy formation and evolution model and constraining cosmology.

关 键 词：宇宙学 宇宙大尺度结构 星系 暗物质晕 

分 类 号：P152[天文地球—天文学]