The Overdensities of Galaxy Environments as a Function of Luminosity and Color

Citation:

Hogg DW, Blanton MR, Eisenstein DJ, Gunn JE, Schlegel DJ, Zehavi I, Bahcall NA, Brinkmann J, Csabai I, Schneider DP, et al. The Overdensities of Galaxy Environments as a Function of Luminosity and Color. The Astrophysical Journal Letters. 2003;585 :L5-L9.

Date Published:

March 1, 2003

Abstract:

We study the mean environments of galaxies in the Sloan Digital SkySurvey (SDSS) as a function of rest-frame luminosity and color.Overdensities in galaxy number are estimated in 8 and 1 h-1Mpc spheres centered on 115,000 galaxies taken from the SDSSspectroscopic sample. We find that, at constant color, overdensity isindependent of luminosity for galaxies with the blue colors of spirals.This suggests that at fixed star formation history, spiral-galaxy massis a very weak function of environment. Overdensity does depend onluminosity for galaxies with the red colors of early types; bothlow-luminosity and high-luminosity red galaxies are found to be inhighly overdense regions.

Notes:

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