AAS Meeting #193 - Austin, Texas, January 1999
Session 38. Galaxy Clusters
Display, Thursday, January 7, 1999, 9:20am-6:30pm, Exhibits Hall 1

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[38.01] ASCA Observations of Abell 2255

D.S. Davis (MIT), R.E. White (University of Alabama)

As observations of clusters of galaxies in the X-ray regime improve, there is increasing evidence that mergers in rich clusters are common. Like other rich clusters, Abell 2255 shows many of the signs of a major merger. These include an extensive radio halo, a pair of central dominant galaxies, elliptical X-ray isophotes that are offset from the dominant galaxies, and strong temperature variations in the X-ray emitting gas. The ROSAT PSPC data indicate that the gas temperature may vary by a factor of almost eight from the cool to the hot regions. Here we present ASCA observations of this cluster which confirm the strong spatial temperature variations seen in the X-ray gas with the ROSAT PSPC, and we discuss the merger history for this cluster.

The author(s) of this abstract have provided an email address for comments about the abstract: dsd@space.mit.edu

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