Butcher & Oemler Cluster A2111: A Head-on Merger at z = 0.23

Details Butcher & Oemler Cluster A2111: A Head-on Merger at z = 0.23 Butcher & Oemler Cluster A2111: A Head-on Merger at z = 0.23

1997-02-04

arxiv.org/abs/astro-ph/9702035v1

Astronomy and Astrophysics

Astrophysics

To be published in MNRAS, 16 pages, plus 13 figures in the GIF or jpeg format (uuencoded). Black & white postscript files of t

Scientific paper

We present ROSAT PSPC and HRI observations of A2111, the richest galaxy cluster photometrically surveyed by Butcher & Oemler (1984). The cluster contains a distinct comet-shaped X-ray subcomponent, which 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.

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