团成员星系类型与颜色—颜色梯度

发布时间：2018-05-21 07:20

本文选题：团成员星系 + 类型分层　；参考：《上海师范大学》2013年硕士论文

【摘要】：星系团的颜色分布与类型分层效应是星系团形成与长时间演化累积而成的统计现象。通过研究星系团颜色分布及类型分层效应，根据星系团中不同类型的星系性质，分析环境对各类型星系演化过程的影响。近年来研究显示：团星系与场星系的形态类型的比例并不一致，晚型星系受环境影响其演化路径、形态以及对应的光学特征不尽相同。通过研究Coma星系团成员星系形态类型与颜色的分布，可以分析星系团动力学演化与模型，分析星系团子结构以及相关的动力学性质和历史。文中选用Beijersbergen和van der Hulst（2002）的数据，分析观测波段、星系分类、并剔除可能不准确的数据，得到满足条件的数据，研究星系团形态类型的分布及其颜色、颜色梯度分布。结果表明：Coma星系团的颜色中心与星系团光度中心或数密度中心并不重合。早、晚型星系的空间位置分布、颜色以及颜色梯度差异很大。总体而言，星系团颜色表现为颜色中心偏红，进而变蓝，，到最后却缓慢变红的总体趋势。在离颜色中心比较远的区域，早、晚型星系的颜色梯度为正，特别是晚型星系,这也许是由于SW星系群与住星系群之间相互作用的结果。整个星系团的颜色分布在小尺度上表现出一定的梯度结构，但大尺度上并不明显，表明Coma星系团并没有完全维里化，证明了团成员早、晚型星系在空间位置、颜色分布方面明显的不同。关
[Abstract]:The effect of color distribution and type stratification of clusters is a statistical phenomenon of cluster formation and long-term evolution and accumulation. By studying the color distribution and type stratification effect of clusters, the influence of environment on the evolution of different types of galaxies is analyzed according to the properties of different types of galaxies in clusters. Recent studies have shown that the proportions of cluster galaxies and field galaxies are not the same, and the evolution path, morphology and corresponding optical characteristics of late type galaxies are different due to the influence of environment. By studying the morphological type and color distribution of galaxies in the Coma cluster, the dynamic evolution and model of the cluster, the substructure of the cluster and the related dynamic properties and history can be analyzed. In this paper, the data of Beijersbergen and van der Hulst (2002) are used to analyze the observed bands and the classification of galaxies, and to eliminate the data which may not be accurate, and to obtain the data satisfying the conditions, and to study the distribution of the morphological types of the clusters, their color and color gradient distribution. The results show that the color center of the cluster does not coincide with the luminosity center or the number density center of the cluster. The spatial distribution, color and color gradient of early and late galaxies vary greatly. In general, the cluster color shows the general trend of red center, then blue, and finally slowly red. In areas far from the color center, the color gradient of early and late galaxies is positive, especially late galaxies, which may be due to the interaction between SW galaxy group and host galaxy group. The color distribution of the whole cluster shows a gradient structure on a small scale, but it is not obvious on a large scale, indicating that the Coma cluster is not completely virified, which proves that the early and late galaxies of the cluster are located in space. A marked difference in color distribution. Pass
【学位授予单位】：上海师范大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P154.1

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