1E 0657−56: A Contender for the Hottest Known Cluster of Galaxies
The Astrophysical Journal1998Vol. 496(1), pp. L5–L8
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W. Tucker, P. R. Blanco, S. A. Rappoport, L. P. David, Daniel G. Fabricant, E. Falco, W. Forman, Alan Dressler, M. Ramella
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 $\\rm{kT}=17.4 \\pm 2.5 keV$, which makes it an unusually hot cluster, with important cosmological implications.
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