TRACING THE ASSEMBLY HISTORIES OF GALAXY CLUSTERS IN THE NEARBY UNIVERSE

IF 1.1 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS

Revista Mexicana de Astronomia y Astrofisica Pub Date : 2023-10-01 DOI:10.22201/ia.01851101p.2023.59.02.13

C. A. Caretta, H. Andernach, M. Chow-Martínez, R. Coziol, J. De Anda-Suárez, C. Hernández-Aguayo, J. M. Islas-Islas, M. M. Mireles-Vidales, M. A. Muñiz-Torres, H. Santoyo-Ruiz, J. J. Trejo-Alonso, Y. Venkatapathy, J. M. Zúñiga

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引用次数: 0

Abstract

We have compiled a sample of 67 nearby (z < 0.15) clusters of galaxies, for which on average more than 150 spectroscopic members are available and, by applying different methods to detect substructures in their galaxy distribution, we have studied their assembly history. Our analysis confirms that substructures are present in 70% of our sample, having a significant dynamical impact in 57% of them. A classification of the assembly state of the clusters based on the dynamical significance of their substructures is proposed. In 19% of our clusters, the originally identified brightest cluster galaxy is not the central gravitationally dominant galaxy (CDG), but turns out to be either the second-rank, or the dominant galaxy of a substructure (a SDG, in our classification), or even a possible “fossil” galaxy in the periphery of the cluster. Moreover, no correlation was found in general between the projected offset of the CDG from the X-ray peak and its peculiar velocity.

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追踪附近宇宙中星系团的聚集历史

我们收集了附近67个国家的样本(z <0.15)星系团，其中平均有150多个光谱成员可用，通过应用不同的方法来探测其星系分布中的亚结构，我们研究了它们的组装历史。我们的分析证实，我们的样本中有70%存在子结构，其中57%具有显著的动态影响。提出了一种基于子结构动态意义的聚类装配状态分类方法。在19%的星系团中，最初确定的最亮的星系团星系不是中心引力优势星系(CDG)，而是二级星系，或者是亚结构(SDG，在我们的分类中)的优势星系，甚至可能是星系团外围的“化石”星系。此外，在x射线峰的CDG投影偏移与其特殊速度之间一般没有发现相关性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Revista Mexicana de Astronomia y Astrofisica 地学天文-天文与天体物理

CiteScore

1.30

自引率

10.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Revista Mexicana de Astronomía y Astrofísica, founded in 1974, publishes original research papers in all branches of astronomy, astrophysics and closely related fields. Two numbers per year are issued and are distributed free of charge to all institutions engaged in the fields covered by the RMxAA.