Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 372, Issue 1, Pages 253-258Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2006.10849.x
Keywords
galaxies : clusters : general; galaxies : evolution; galaxies : fundamental parameters
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We analyse u - r colour distributions for several samples of galaxies in groups drawn from the fourth data release of the Sloan Digital Sky Survey. For all luminosity ranges and environments considered, the colour distributions are well described by the sum of two Gaussian functions. We find that the fraction of galaxies in the red sequence is an increasing function of group virial mass. We also study the evolution of the galaxy colour distributions at low redshift, z <= 0.18 in the field and in groups for galaxies brighter than M-r - 5 log (h) = -20, finding significant evidence of recent evolution in the population of galaxies in groups. The fraction of red galaxies monotonically increases with decreasing redshift, this effect implies a much stronger evolution of galaxies in groups than in the field.
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