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   51235
   The ratio of stellar mass and total baryonic mass including hot
   intracluster gas indicates formation efficiency of galaxy from
   primordial gas. If this ratio become zero, we can expect the existense
   of hot gas with no association of galaxies. A search for such gas, if
   exist, is essential information to study the evolution of primordial
   gas including dark matter. We propose ASCA observation of the best
   candidate of such large cloud of hot gas with no visible galaxies
   selected by Einstein and elemental abundance information of them will
   give strong constraint on the origin of them.
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