1E0657-56: A Contender for the Hottest Known Cluster of Galaxies
Abstract
We identify the extended Einstein IPC X-ray source, 1E0657-56, with a previously unknown cluster of galaxies at a redshift of z=0.296. Optical CCD images show the presence of a gravitational arc in this cluster and galaxy spectra yield a cluster velocity dispersion of 1213+352-191 km s-1. X-ray data obtained with the ROSAT HRI and ASCA indicate that 1E0657-56 is a highly luminous cluster in which a merger of subclusters may be occurring. The temperature of the hot gas in 1E0657-56 is kT=17.4 2.5 keV, which makes it an unusually hot cluster, with important cosmological implications.
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