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28 March 2024
 
  » arxiv » astro-ph/0212085

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The overdensities of galaxy environments as a function of luminosity and color
David W. Hogg ; Michael R. Blanton ; Daniel J. Eisenstein ; James E. Gunn ; David J. Schlegel ; Idit Zehavi ; Neta A. Bahcall ; Jon Brinkmann ; Istvan Csabai ; Donald P. Schneider ; David H. Weinberg ; Donald G. York ;
Date 4 Dec 2002
Journal Astrophys.J. 585 (2003) L5-L10
Subject astro-ph
AffiliationNYU
AbstractWe study the mean environments of galaxies in the Sloan Digital Sky Survey as a function of rest-frame luminosity and color. Overdensities in galaxy number are estimated in $8 h^{-1} mathrm{Mpc}$ and $1 h^{-1} mathrm{Mpc}$ spheres centered on $125,000$ galaxies taken from the SDSS spectroscopic sample. We find that, at constant color, overdensity is independent of luminosity for galaxies with the blue colors of spirals. This suggests that, at fixed star-formation history, spiral-galaxy mass is a very weak function of environment. Overdensity does depend on luminosity for galaxies with the red colors of early types; both low-luminosity and high-luminosity red galaxies are found to be in highly overdense regions.
Source arXiv, astro-ph/0212085
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