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      The scale-dependence of relative galaxy bias: encouragement for the halo model description

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          Abstract

          We investigate the relationship between the colors, luminosities, and environments of galaxies in the Sloan Digital Sky Survey spectroscopic sample, using environmental measurements on scales ranging from 0.2 to 6 Mpc/h. We find: (1) that the relationship between color and environment persists even to the lowest luminosities we probe (absolute magnitude in the r band of about -14 for h=1); (2) at luminosities and colors for which the galaxy correlation function has a large amplitude, it also has a steep slope; and (3) in regions of a given overdensity on small scales (1 Mpc/h), the overdensity on large scales (6 Mpc/h) does not appear to relate to the recent star formation history of the galaxies. Of these results, the last has the most immediate application to galaxy formation theory. In particular, it lends support to the notion that a galaxy's properties are related only to the mass of its host dark matter halo, and not to the larger scale environment.

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          Author and article information

          Journal
          01 November 2004
          Article
          10.1086/500918
          astro-ph/0411037
          Custom metadata
          Astrophys.J. 645 (2006) 977-985
          submitted to ApJ; full resolution figures and slide material available at http://cosmo.nyu.edu/blanton/scale_density.html
          astro-ph

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