The scale dependence of relative galaxy bias: Encouragement for the "halo model" description

Michael R. Blanton, Daniel Eisenstein, David W. Hogg, Idit Zehavi

    Research output: Contribution to journalArticlepeer-review

    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 h-1 Mpc. We find that (1) the relationship between color and environment persists even to the lowest luminosities we probe (Mr - 5 log10h ∼ -14); (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 h-1 Mpc), the overdensity on large scales (6 h-1 Mpc) 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.

    Original languageEnglish (US)
    Pages (from-to)977-985
    Number of pages9
    JournalAstrophysical Journal
    Volume645
    Issue number2 I
    DOIs
    StatePublished - Jul 10 2006

    Keywords

    • Galaxies: clusters: general
    • Galaxies: fundamental parameters
    • Galaxies: statistics

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

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