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   61186
   3C324 is a radio galaxy located at z=1.2. There are three independent
   indications that this radio galaxy is in a rich cluster of galaxy;
   redshift of galaxies in nearby direction, the coherent shear of
   background galaxies, and an extended X-ray emission detected by ROSAT.
   With ASCA, we can determine the temperature of X-ray emission and the
   redshift of the hot gas, thereby we can confirm the existence of
   cluster and obtain a constraint on the evolution of hot gas at z=1.2.
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