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   71169
   3C356 is a candidate of a high-z large cluster of galaxies (z=1.079).
   The excess number density of the galaxies and the slightly extended
   high X-ray emission by ROSAT/HRI suggest its existence. The luminosity
   with ROSAT was 2.5E44 erg/s (0.4-4keV at rest frame). This proposal is
   to confirm the existence of the cluster and to obtain the luminosity,
   the temperature and the iron abundance. The existence of the high-z
   clusters and their physical parameters have large effects on the
   evolution of the universe.
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