Counts of galaxies in the Perseus cluster are used to determine the center, the distribution of galaxies to different limiting magnitudes, the core radius, and the apparent anisotropy. The mass and luminosity of the cluster core are calculated, and the ratio of central mass to visual light is found to be about 700(11o1100) solar units with conventional assumptions. Subject heading: galaxies, clusters of
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Neta A. Bahcall (1974) studied this question.
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