引力透镜与类星体─星系(星系团)成协

Gravitational Lensing and the Quasar─galaxcy(cluster) Associations

综述了背景光源（类星体）与前方天体（星系、星系团等）成协的观测和统计事例．详尽叙述了与成协问题相关的引力透镜理论．全面介绍了对各种成协事例进行引力透镜理论解释的方法、研究现状及存在的问题．还给出了一种计算成协样品中面密度超出因子的改进方法．

In this paper, the observational evidence and statistical analysis on the association of bedground sources (such as QSOs)with foregrOUnd Objects (such as galaxies and clusters of galaxiesetc.) are reviewed. The gravitational lensing theory which is relevant to the problem of associations is reviewed in detail. The methods and statement of research and easting Probloms inexplaining Various associations through gravitational lensing theory are completely introducedhere. We have also Proposed a modification for the computation of the surface density enhancement in association samples.