星系空间取向的理论和观测研究  

The spatial alignment of galaxies on different scales:A review on the theoretical and observational progress

作　　者：康熙[1] 王鹏[1,2] 罗煜[1,2] 夏千里 潘恒星 

机构地区：[1]中国科学院紫金山天文台,南京210008 [2]中国科学院大学研究生院,北京100049

出　　处：《中国科学：物理学、力学、天文学》2017年第4期13-33,共21页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家重点基础研究发展规划(编号:2015BC857003;2013CB834900);江苏省杰出青年基金(编号:BK20140050);国家自然科学基金重点项目(编号:11333008)资助

摘　　要：星系在空间的分布并非随机,在不同的尺度上呈现不同的排列特征.在星系和星系团等中小尺度上,卫星星系的分布倾向于分布在中央星系的主轴方向上.在大尺度上,中央星系的主轴倾向于指向大尺度的物质分布,如平行于大尺度的纤维结构.在更大尺度上,星系的主轴之间也有一定的取向关联.此外,星系的角动量也与大尺度物质分布有一定的关联.本文将回顾星系空间取向的相关理论和观测研究的进展,指出小尺度上星系的空间各项异性主要是由非球对称的暗物质晕决定的,与大尺度物质分布的相关性正是冷暗物质模型下结构形成的典型特征,研究星系在不同尺度上的各项异性分布有利于理解星系形成物理和限制暗物质、暗能量模型.The spatial distribution of galaxies in our universe is not random, and they demonstrate different alignment patterns on different scales. On the scale of galaxy and galaxy clusters, satellite galaxies tend to be distributed along the major axis of the central galaxy. On large scales, major axis of a central galaxy tends to point towards large scale matter distribution, for example, along the large scale filamentary structure. Even on larger scales, the major axes of different galaxies still have non-negligible correlations. Besides, the angular momentums of galaxies are also correlated with the mass distribution on large scales, with different correlations. This article will review the relative theories and observational developments in galaxies’ alignment and spatial distribution, it will show that the anisotropic distributions of galaxies on small scales are determined by the non-spherical nature of dark matter halo, and the correlations with large-scale mass distribution are also the natural predictions of cold dark matter theory, and this article also indicates that studies of galaxy alignment help us to understand the physics of galaxy formation and could be used to constrain the nature of dark matter and dark energy.

关 键 词：大尺度结构 星系形成 暗物质 数值模拟 星系演化 

分 类 号：P152[天文地球—天文学]