【摘要】 本文介绍了近一年来对星系大尺度本动运动的理论分析的最新进展。由大尺度本动速度场的相关性分析得出,半人马座的三个椭圆星系团可能主导着椭圆星系样品的速度相关函数。如果初始扰动是n<0的高斯谱,则引力等级式成团可以使得大质量团的成员(椭圆星系)的速度相关函数被放大,从而产生出表观的大尺度本动速度场。由势流方法(即由本动速度势回推密度扰动场)得到在长蛇一半人马超团附近存在着一个大质量的密度扰动峰,即巨大吸引物(GA),它主导着星系的大尺度本动运动。然而,由于目前已知距离的星系样品不足,且距离测量中的误差严重影响着对大尺度本动速度场的描述,故上述几方面的分析都含有许多不确定性。更多还原

【Abstract】 In this paper we introduce some new progresses which were made in the past one year on theoretical analysis of large scale peculiar motions of galaxies. The correlation analysis on large scale peculiar velocity field shows that three clusters of elliptical galaxies in Centaurus region may dominate the velocity correlation function of elliptical galaxy samples. If the primordial perturbation had a form of Gaussian spectrum with n<0, then the velocity correlation function of the massive members of hierachical clustering would be amplified leading to an apparently larger gravitational field, and one would expect to find larger average peculiar velocities when measured from a sample of more massive members of the hierachy. The velocity potential analysis shows that there is a massive density perturbation peak (Great Attactor) existing in the region of Hydra-Centaurus. However, there are still some uncertaities in analysis of large scale peculiar velocity field of galaxies due to the sparsity of galaxy samples with known distances and due to the errors in distance measurements which seriously affect the description on large scale peculiar motions of galaxies.更多还原