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   PR # 42196
   We propose an investigation of a newly discovered cluster of galaxies
   at z=0.3, 1E 0657-56, for which CCD imaging has revealed the presence
   of a luminous arc due to gravitational lensing. ASCA observations
   will provide a measurement of the temperature of the X-ray emitting
   gas; together with a recent ROSAT HRI observation of the spatial
   profile we can then estimate the mass distribution of this cluster,
   to be compared with the mass determined independently from modelling
   of the gravitational lensing and the velocity dispersion of cluster
   galaxies. ASCA will also give us an estimate of the abundance of iron
   in a distant cluster, an important datum for the study of the
   evolution of intracluster gas.
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