Other
Scientific paper
Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...306..384t&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 306, July 15, 1986, p. 384-389.
Other
20
Galactic Clusters, Galactic Structure, Mass Distribution, Isothermal Processes, Luminosity, Radial Distribution
Scientific paper
The galaxy distribution in six Butcher-Oemler clusters is analyzed in order to obtain separate core radii for the blue galaxies and for the red E-sequence galaxies. By fitting these distributions with isothermal spheres via maximum-likelihood techniques, the core radius for the blue galaxies is shown to be nearly three times that of the red galaxies. While the general trend of the blue/red galaxy segregation was noticed by Butcher and Oemler, the analysis is presented here places this result on firm statistical ground. A test for luminosity segregation gives only marginally significant results, while a comparison of differential luminosity functions shows that blue galaxies, in their quiescent state, are likely to be about 1 mag fainter than red E-sequence galaxies. When combined with each other, the two previous results imply that mass segregation cannot explain the broad blue galaxy distribution. A discussion of dynamical considerations particularly the relative velocity dispersions of blue and red galaxies - is included to show how the blue/red galaxy segregation might arise.
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