论文标题
昏迷超集群中星系的演变
Evolution of galaxies in groups in the Coma Supercluster
论文作者
论文摘要
我们仔细研究了昏迷超集群中的星系，并评估环境的作用（以群集，组和超集群细丝的形式）在其演变中，特别是研究组的作用。我们根据诸如丰富度和光晕质量的内在特性以及它们在超级收集器中的位置以及与两个丰富的群集Abell 1656（Coma）和Abell 1367的位置来表征这些组。我们设计了一种使用核密度估计器来表征局部环境的新方法。我们发现，除了星系质量的主要作用外，环境对星系的影响是过度繁殖在各种尺度上的复杂组合，这是根据组的成员资格以及银河系对细丝的位置的特征，及其对群集输入区域的接近。是否可以将气体变成恒星取决于预处理的水平，这在给定环境中如何增强恒星形成方面发挥了作用。我们的结果与细丝中的冷模式中积聚的气体一致，可用于增强恒星形成。最后，我们表明，与细丝系统的昏迷相反，超级收集器的Abell〜1367端正在组装过程中，从而导致恒星形成活动增强。
We take a close look at the galaxies in the Coma Supercluster and assess the role of the environment (in the form of cluster, group and supercluster filament) in their evolution, in particular examining the role of groups. We characterise the groups according to intrinsic properties such as richness and halo mass, as well as their position in the supercluster and proximity to the two rich clusters, Abell 1656 (Coma) and Abell 1367. We devise a new way of characterising the local environment using a kernel density estimator. We find that apart from the dominant effects of the galaxy mass, the effect of the environment on galaxies is a complex combination of the overdensities on various scales, which is characterised in terms of membership of groups, and also of the position of the galaxy on filaments and their proximity to the infall regions of clusters. Whether the gas can be turned into stars depends upon the level of pre-processing, which plays a role in how star formation is enhanced in a given environment. Our results are consistent with gas accreted in the cold mode from the filaments, being made available to enhance star formation. Finally, we show that the Abell~1367 end of the supercluster is in the process of assembly at present, leading to heightened star formation activity, in contrast with the Coma-end of the filament system.
