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   61224
   Le Fevre et al. first performed systematic arc survey with a X-ray flux
   limited complete sample and found highly frequent appearance of giant
   luminous arcs in the survey sample. This result suggests highly
   centrally concentrated and highly asymmetric matter distribution in
   high redshift clusters of galaxies. We have been carrying out a project
   which quantifies asymmetric matter distribution and substructures
   through intra-cluster gas distribution by ROSAT HRI observations(this
   will be accomplished during ROSAT AO7) and also quantifies a
   gravitational potential depth by ASCA temperature measurements for each
   cluster in the Le Fevre sample. If our proposed observations are put
   into practice, temperature measurements by ASCA for all clusters in Le
   Fevre sample will be completed.
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