The evolution of the bi-modal colour distribution of galaxies in SDSS groups

Details The evolution of the bi-modal colour distribution of galaxies in SDSS groups The evolution of the bi-modal colour distribution of galaxies in SDSS groups

2006-07-12

arxiv.org/abs/astro-ph/0607273v1

Mon.Not.Roy.Astron.Soc.372:253-258,2006

Astronomy and Astrophysics

Astrophysics

7 pages, 6 figures, submited to MNRAS after minor revision

Scientific paper

10.1111/j.1365-2966.2006.10849.x

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, $z\le0.18$ 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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