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Are Dumbbell Brightest Cluster Members Signposts to Galaxy Cluster Activity?

机译:哑铃最聪明的集群成员是Galaxy集群活动的路标吗?

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We assemble a sample of galaxy clusters whose brightest members are dumbbell galaxies and compare them with a control sample in order to investigate if they are the result of recent mergers. We show that the dumbbell sample is no more likely than other clusters to exhibit subclustering. However, they are much more likely to have at least one dumbbell component possessing a significant peculiar velocity with respect to the parent cluster than a non-dumbbell brightest cluster member. We interpret this in the context of seeing the clusters at various stages of post-merger relaxation.
机译:我们组装了一个最亮的成员是哑铃星系的星系团样本,并将其与对照样本进行比较,以调查它们是否是最近合并的结果。我们表明,哑铃样本没有比其他集群更有可能表现出亚集群。然而,与非哑铃最亮的簇成员相比,它们更有可能具有至少一个相对于父簇具有显着特殊速度的哑铃成分。我们在看到合并后放松各个阶段的集群的背景下对此进行解释。

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