Abstract
ABSTRACT It is shown that Sandage's arguments for a constant mean surface brightness of firstranked cluster ellipticals are incorrect. In addition, a cosmic dispersion of 0.29 mag is found and first-ranked galaxies in irregular clusters appear to have brighter than average surface brightness. The potential usefulness of a surface brightness-redshift plot as an important cosmological test is discussed. Key words: surface brightuesses of galaxies - clusters of galaxies - photometry of galaxies - cosmology
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