标题： ESO 邻近阿贝尔星系团调查。 XI. 星系团星系的分离和次簇结构 显示英文标题

标题： The ESO Nearby Abell Cluster Survey. XI. Segregation of cluster galaxies and subclustering

摘要： 我们研究了在ESO附近星系团调查（ENACS）中观测到的59个丰富、邻近星系团的集合星系团中超过3000个星系的光度和形态分离情况。 在该样本中，我们识别出处于次结构中的星系。 我们使用二维柯尔莫哥洛夫-斯米尔诺夫检验，比较了几个子样本的投影星系团中心距离R和“归一化”的相对视线速度v的分布。 我们发现只有在次结构之外且光度高于M_R = -22.0 +/- 0.1（h0=100 km/s/Mpc）的椭圆星系才显示出光度分离的证据。 我们确认了早型和晚型星系之间的已知分离现象。 次结构之外的早型旋涡星系（Sa--Sb）和晚型旋涡星系（Sbc--Ir）似乎具有不同的（R,v）分布。 在每种形态类别中，处于次结构中的星系与不在次结构中的星系具有不同的（R,v）分布。 在不在次结构中的星系样本中，至少可以而且必须区分出三个集合：[E+S0]、S_early和[S_late+ELG]。 [E+S0]集合最集中在中心，其速度弥散度较低，并且随半径变化不大。 [S_late+ELG]集合最不集中，其速度弥散度最高，并且向中心显著增加。 S_early星系的（R,v）分布介于其他两个集合之间。 在次结构中的星系中，S0和[S_late+ELG]星系具有不同的（R,v）分布。 我们简要讨论了我们的结果对星系团内星系破坏和转化过程的意义。 [ABRIDGED] 显示英文摘要

摘要： We study luminosity and morphology segregation of over 3000 cluster galaxies in an ensemble cluster of 59 rich, nearby galaxy clusters observed in the ESO Nearby Cluster Survey (ENACS). Within this sample we identify those galaxies that are in substructures. We compare the distribution of projected clustercentric distance, R, and 'normalized' relative line-of-sight velocity, v, of several subsamples, using the 2D Kolmogorov-Smirnov test. We find evidence of luminosity segregation only for the ellipticals outside substructure and brighter than M_R = -22.0 +/- 0.1 (h0=100 km/s/Mpc). We confirm the well-known segregation of early- and late-type galaxies. The early and late spirals (Sa--Sb and Sbc--Ir respectively) outside substructure also appear to have different (R,v)-distributions. In each morphological class, the galaxies within substructure have different (R,v)-distributions from the galaxies that are not in substructure. Among the samples of galaxies that are not in substructure, at least 3 ensembles can and must be distinguished: [E+S0], S_early, and [S_late+ELG]. The [E+S0] ensemble is most centrally concentrated and has a fairly low velocity dispersion that hardly varies with radius. The [S_late+ELG] ensemble is least concentrated and has the highest velocity dispersion, which increases significantly towards the centre. The (R,v)-distribution of S_early galaxies is intermediate between those of the two other ensembles. Among the galaxies within substructure the S0 and [S_late+ELG] galaxies have different (R,v) distributions. We discuss briefly the implications of our results for processes of galaxy destruction and transformation within clusters. [ABRIDGED]