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   61182
   Since the volume number density of member galaxies is quite high in
   galaxy groups, every galaxies would be merged into a giant elliptical
   galaxy in a few Gyr. This was theoretically pointed out by Barns. In
   order to chech this evolution scenario, we propose to observe an X-ray
   selected galaxy group RXJ0454.8-1806, which is one of the X-ray
   brightest group of galaxies discovered in the ROSAT All Sly Survey and
   optical follow up observations. This system is dominated by a giant
   elliptical galaxy and may be an evolved system. Since it is as bright
   as HCG62 which is the brightest galaxy group observed with ASCA so far,
   ASCA data will surely allow us to measure the gas mass, total
   gravitating mass, amount of heavy elements and their spatial
   distributions with very good accuracy.
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