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   PR #    48
   Abell 370 is a distant (z=0.373), rich, X-ray luminous (1.3e45 erg/s)
   clusterin which exhibits (gravitationally lensed) arcs and has an
   anomalously large spire the first broad-band(E>3.5 keV) X-ray spectrum
   of this object. The spectrum will be of sufficientsignal:noise ratio
   (~15,000 counts/4 telescopes) to check for the presence of multiple
   temperature components in the gas, and it will probablyplace
   interesting upper limits on Fe K emission and Fe abundance.
   Theseresults can be compared with predictions of models of the mass
   distributionderived from optical studies of the arcs. In conjunction
   with ASCA observationsof other distant clusters, these data will
   illuminate processes of clusterevolution.
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