The bimodal galaxy color distribution: dependence on luminosity and environment

Details The bimodal galaxy color distribution: dependence on luminosity and environment The bimodal galaxy color distribution: dependence on luminosity and environment

2004-06-10

arxiv.org/abs/astro-ph/0406266v1

Astrophys.J.615:L101,2004

Astronomy and Astrophysics

Astrophysics

ApJ Letters, in press. 5 pages and 3 inline figures,using emulateapj style. Fig 1 larger than in published version. Fit parame

Scientific paper

10.1086/426079

We analyse the u-r color distribution of 24346 galaxies with Mr<=-18 and z<0.08, drawn from the Sloan Digital Sky Survey first data release, as a function of luminosity and environment. The color distribution is well fit with two Gaussian distributions, which we use to divide the sample into a blue and red population. At fixed luminosity, the mean color of the blue (red) distribution is nearly independent of environment, with a weakly significant (~3sigma) detection of a trend for colors to become redder by 0.1-0.14 (0.03-0.06) mag with a factor ~100 increase in local density, as characterised by the surface density of galaxies within a +/-1000 km/s redshift slice. In contrast, at fixed luminosity the fraction of galaxies in the red distribution is a strong function of local density, increasing from ~10-30 per cent of the population in the lowest density environments, to ~70 per cent at the highest densities. The strength of this trend is similar for both the brightest (-23

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