Are dumbbell brightest cluster members signposts to galaxy cluster activity?

Details Are dumbbell brightest cluster members signposts to galaxy cluster activity? Are dumbbell brightest cluster members signposts to galaxy cluster activity?

2008-08-15

arxiv.org/abs/0808.2093v1

Publ.Astron.Soc.Austral.25:176-183,2008

Astronomy and Astrophysics

Astrophysics

10 pages, 2 figures, accepted for publication in PASA

Scientific paper

10.1071/AS08016

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.

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