标题： 基于层次化强大聚类方法的 coma 星团结构研究 显示英文标题

标题： Study of the Structure of the Coma Cluster Based on a Hierarchical Powerful Clustering Method

摘要： 在后发星系团中选择了六个亚团，这些亚团是基于一种考虑星系间引力相互作用的层次聚类方法。其中，围绕星系NGC 4889、NGC 4874和NGC 4839的三个主要亚团被单独挑选出来。我们使用了Vennik和Anosova在研究紧密星系群时采用的客观统计标准，以高概率评估每个亚团中的成员。包括来自Bravo-Alfaro列表中的对象在内，那些氢气（HI）显著缺失的星系被识别为亚团的成员，尤其是在围绕NGC 4874和NGC 4839的亚团中拥有最多的此类星系。使用RCG3目录中的HI指数对氢气缺乏程度进行定量估计，结果显示，这些亚团中的星系相比于在后发星系团所研究区域内的氢气缺乏场星系具有统计上显著更高的值。在这些亚团中，许多氢气缺乏的旋涡星系同时也是射电源。 显示英文摘要

摘要： Six subclusters in the Coma cluster have been selected on the basis of a hierarchical clustering method that takes the gravitational interaction among galaxies into account. Of these, three main subclusters around the galaxies NGC 4889, NGC 4874, and NGC 4839 have been singled out. We have used the objective statistical criterion applied by Vennik and Anosova in studies of close groups of galaxies to evaluate each member included in a subcluster with a high probability. Galaxies with a significant deficit of hydrogen HI, including objects from the Bravo-Alfaro list,have been identified with members of the subclusters, with the greatest number of them in the subclusters around NGC 4874 and NGC 4839. A quantitative estimate of the hydrogen deficit using the HI index in the RCG3 catalog reveals a statistically significant excess value for those galaxies that are members of the subclusters compared to the field galaxies with a hydrogen deficit in the studied area of Coma cluster. A substantial number of the spiral galaxies with a hydrogen deficit in the subclusters turned out to be radio galaxies as well.