Are Dumbbell Brightest Cluster Members Signposts to Galaxy Cluster Activity?

Publications of the Astronomical Society of Australia

K. A. Pimbblet¹ 

关键词: galaxies: clusters: general;    galaxies: elliptical and lenticular;    cD;    galaxies: evolution;   

DOI  :  10.1071/AS08016

学科分类：天文学(综合)

来源: CSIRO

【 摘 要 】

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.

【 授权许可】

Unknown