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   PR # 41226
   Irregular clusters of galaxies give us an great opportunity to
   investigate a merging process in evolution of clusters. Since such
   clusters include several sub-clusters interacting each other, their
   distributions of temparature and metalicity may differ between
   different stages of evolution. Preceeding the ASCA satellite,
   however, it was impossible to determine such important quantities
   becuase no instrument could image clusters with arc-minutes
   resolution in hard X-ray band. The ASCA has good energy resolution
   and moderate spacial resolution in wider energy band up to 10keV,
   which enables us to measure spacial distributions of temparature and
   metalicity in the clusters. Here we propose to observe two irregular
   clusters A1644 and A2384 in order to unveil the mystery of cluster
   merging.
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