【摘要】 Abell 85是位于南半天区红移为0.055的cD星系团.基于前人的光谱观测数据和SDSS(Sloan Digital Sky Survey)数据,利用3σ方法筛选出该星系团的370个成员星系,并对其动力学情况进行了分析.从这些成员星系的空间分布和局域视向速度分布中,发现了该星系团含有4个明显的子结构,且正处于两两并合之中.这表明Abell 85处在动力学活跃的状态,远未达到动力学平衡.更多还原

【Abstract】 Abell 85 is a cD galaxy cluster(z～0.055) at southern hemisphere.Based on the spectroscopic data in literatures and SDSS(Sloan Digital Sky Survey) data,370 member galaxies of this cluster are obtained by 3σclipping algorithm,and the dynamical structures are investigated.By studying spatial distribution and localized variation of velocity distribution,four substructures have been found to be two merging pairs.This suggests that the galaxy cluster Abell 85 is still dynamically active,far from the status of dynamical equilibrium.更多还原