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   62162
   We propose a continuing investigation of a newly discovered cluster at
   z=0.3, 1E0657-56, for which CCD imaging has revealed the presence of
   gravitational arcs. Rosat HRI imaging suggests that 1E0657-56 is a
   luminous merger of sub-clusters. A 20 ks Asca Cycle 4 observation
   resulted in a best-fit temperature of kT=17.5+/-2.5 keV, which makes
   1E0657-56 a candidate for the hottest cluster known, and a challenge
   for cosmological models of galaxy cluster formation. The Fe abundance
   provides an important datum for the study of the evolution of the
   intracluster gas. We therefore request an additional 60 ks to measure
   Fe XXVI line emission in this cluster, and to define the 0.5-10 keV
   spectrum more accurately, which will also set strict limits on any
   contaminating hard X-ray flux.
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