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THE MEAN COSMIC DENSITY BASED ON MASSES OF CLUSTERS OF GALAXIES

The mean ratio R of mass to total 10-O.6M, where M is absolute magnitude, for clusters of galaxies (particularly the Coma cluster) is derived and used to obtain the mean cosmic density based on the assumption that field galaxies have the same mean R as cluster galaxies (including the "unseen" mass). The result is p = (5 2) >c 10-30 g for H = . Key words: cosmic density - galaxies - clusters of galaxies