并合星系团目录:星系团伴星系团、并合子星系团和碰撞后星系团
A catalogue of merging clusters of galaxies: cluster partners, merging subclusters, and post-collision clusters
AI总结:
基于光学巡天数据,本文构建了包含星系团前并合系统、并合子星系团及碰撞后星系团的大规模目录,为研究宇宙层级结构形成与星系团演化提供了重要数据库。
摘要:
在宇宙大尺度结构形成过程中,星系团会发生并合。基于光学巡天数据,我们识别出大量星系团前并合系统以及富星系团中的并合子星系团样本。我们在33,126个主星系团周围,速度差1500 km/s和投影分离5r_{500}范围内发现了39,382个伴星系团,其中r_{500}为主星系团半径。基于成员星系候选者超过30个的富星系团内星系分布,我们用双分量轮廓对平滑光学分布建模来识别子星系团,并在7845个星系团中获得并合子星系团的耦合因子。此外,根据最亮星系团星系与其他成员星系的偏离,我们发现3446个碰撞后并合系统,其中大部分已通过Chandra和XMM-Newton X射线图像得到部分验证。利用光学和X射线图像,我们识别出两个新的类子弹星系团。本文给出的大规模并合星系团样本是研究层级结构形成、星系团演化和星系际介质物理的重要数据库。
英文摘要:
Clusters of galaxies are merging during the formation of large-scale structures in the Universe. Based on optical survey data, we identify a large sample of pre-mergers of galaxy clusters and merging subclusters in rich clusters. We find 39,382 partners within a velocity difference of 1500 km/s and a projected separation of 5r_{500} around 33,126 main clusters, where r_{500} is the radius of the main cluster. Based on the galaxy distribution inside rich clusters with more than 30 member galaxy candidates, we identify subclusters by modeling the smoothed optical distribution with a two-component profile, and a coupling factor is obtained for merging subclusters in 7845 clusters. In addition, we find 3446 post-collision mergers according to the deviations of brightest cluster galaxies from other member galaxies, most of which have been partially validated by using the Chandra and XMM-Newton X-ray images. Two new bullet-like clusters have been identified by using the optical and X-ray images. The large samples of merging clusters of galaxies presented here are important databases for studying the hierarchical structure formation, cluster evolution, and the physics of intergalactic medium.
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