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   62157
   We propose ASCA observations of RXJ 1532.9+3021, a galaxy cluster that
   we have detected in the Sunyaev-Zel'dovich (SZ) effect. This cluster
   was chosen as part of a sample in which selection effects that arise in
   determining the cosmic distance scale using SZ effect and X-ray data
   are tightly controlled. The ASCA data will provide information on the
   temperature of the intracluster hot gas that is essential for applying
   and testing the technique. The proposed observations, combined with
   ASCA data from earlier rounds, represent the first rigorous attempt to
   measure the selection effect biases in the SZ/X-ray distances, which
   must be understood before the distance-measuring techniques can be used
   with confidence.
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