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   PR # 41250
   It is important to investigate the formation and evolution of
   clusters by means of optical and X-ray observations. There are no
   good correlations between optical and X-ray parameters. The detailed
   optical observations ob Abell clusters $(z<0.1)$ in southern sky are
   carried out by ESO key programme. We have selected two rich clusters
   out of 107 A3158(z=0.0592) and A3128(z=0.0600). We make clear the
   correlation among the distribution of galaxies. ICM and dark matter
   in these clusters by combining ASCA data and ESO optical data. This
   gives a clue to investigate the \beta -problem, origin of ISM and
   cluster merging.
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