类星体和Abell星系团的角相关函数  

The Angular Correlation Function of QSOs and Abell Clusters

作　　者：朱杏芬[1] 

机构地区：[1]中国科学技术大学天体物理中心,合肥230026

出　　处：《天体物理学报》1997年第1期21-28,共8页

基　　金：国家自然科学基金资助课题

摘　　要：本文采用目前样品数最大的Hewitt Burbidge类星体总表与覆盖全天区的Abell星系团表 (即ACO表 )研究了类星体与星系团分布的成协问题 .利用交叉相关函数方法 ,发现在角距离θ >3°范围内类星体与Abell团呈反相关现象 .这种反相关主要是由光学选类星体产生的 ,射电选类星体的分布与Abell团基本无关 ,这一事实支持了星系团中尘埃的吸收效应的解释 .在θ <3°范围反而无明显的反相关性 ,说明类星体与星系团存在着成协的倾向 .进一步分析表明类星体与星系团的相关性与红移无关 。Using the new version of the Hewtt Burbidge QSO Catalogue and the all sky catalogue of Abell clusters (ACO, 1989) we analysed the cross correlation function between them, and find anti correlation of QSOs with Abell clusters at a separation of θ> 3°, which is mainly caused by the optically selected rather than the radio selected QSOs. This fact is likely to be explained through the extinction by intracluster dust. However, there is no such anti correlation between the QSOs and Abell clusters at θ< 3°, which implies that there is some tendency of association between the QSOs and clusters. Further analysis indicates that the correlation is not dependent on the redshift of the QSOs, making an explanation by gravitational lensing less likely than otherwise.

关 键 词：类星体 星系团 角相关函数 

分 类 号：P158[天文地球—天文学] P157.8