The Dependence on Environment of the Color-Magnitude Relation of Galaxies


Hogg DW, Blanton MR, Brinchmann J, Eisenstein DJ, Schlegel DJ, Gunn JE, McKay TA, Rix H-W, Bahcall NA, Brinkmann J, et al. The Dependence on Environment of the Color-Magnitude Relation of Galaxies. The Astrophysical Journal Letters. 2004;601 :L29-L32.

Date Published:

January 1, 2004


The distribution in color and absolute magnitude is presented for 55,158galaxies taken from the Sloan Digital Sky Survey in the redshift range0.08-1 Mpc and line-of-sighthalf-length 8 h-1 Mpc. In all environments, bulge-dominatedgalaxies (defined to be those with radial profiles best fitted withlarge Sérsic indices) have a color-magnitude diagram dominated byred galaxies for which the mode of the color distribution at fixedabsolute magnitude depends linearly on absolute magnitude. Although themost luminous galaxies reside preferentially in high-density regions andblue galaxies reside preferentially in low-density regions, there isonly a barely detectable variation with overdensity in the color (zeropoint) or slope of the linear relation between the mode color andluminosity [<0.02 mag in 0.1(g-r) or (B-V)]. These resultsconstrain variations with environmental density in the ages or