Butcher and Oemler cluster A2111 - A head-on merger at z = 0.23

We present ROSAT PSPC and HRI observations of A2111, the richest galaxy cluster photometrically surveyed by Butcher and Oemler (1984). The cluster contains a distinct comet-shaped X-ray subcomponent that appears hotter than the rest of the cluster. The galaxy and X-ray surface brightness distributio...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 1997-07, Vol.288 (3), p.702-714
Main Authors: Wang, Q D, Ulmer, Melville P, Lavery, Russell J
Format: Article
Language:English
Online Access:Get full text
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Summary:We present ROSAT PSPC and HRI observations of A2111, the richest galaxy cluster photometrically surveyed by Butcher and Oemler (1984). The cluster contains a distinct comet-shaped X-ray subcomponent that appears hotter than the rest of the cluster. The galaxy and X-ray surface brightness distributions of the cluster show a similarly elongated morphology. These results suggest that the cluster is undergoing a head-on subcluster merger. This merger may also be responsible for the high fraction of gas-rich blue galaxies observed in the cluster. We have further detected a poor cluster along the merging axis and at a projected distance of about 5 Mpc from A2111. (Author)
ISSN:0035-8711
DOI:10.1093/mnras/288.3.702