Three-point correlation functions of SDSS galaxies: Constraining galaxy-mass bias

Cameron K. McBride, Andrew J. Connolly, Jeffrey P. Gardner, Ryan Scranton, Román Scoccimarro, Andreas A. Berlind, Felipe Marín, Donald P. Schneider

    Research output: Contribution to journalArticle

    Abstract

    We constrain the linear and quadratic bias parameters from the configuration dependence of the three-point correlation function (3PCF) in both redshift and projected space, utilizing measurements of spectroscopic galaxies in the Sloan Digital Sky Survey Main Galaxy Sample. We show that bright galaxies (Mr < -21.5) are biased tracers of mass, measured at a significance of 4.5σ in redshift space and 2.5σ in projected space by using a thorough error analysis in the quasi-linear regime (9-27 h -1 Mpc). Measurements on a fainter galaxy sample are consistent with an unbiased model. We demonstrate that a linear bias model appears sufficient to explain the galaxy-mass bias of our samples, although a model using both linear and quadratic terms results in a better fit. In contrast, the bias values obtained from the linear model appear in better agreement with the data by inspection of the relative bias and yield implied values of σ8 that are more consistent with current constraints. We investigate the covariance of the 3PCF, which itself is a measurement of galaxy clustering. We assess the accuracy of our error estimates by comparing results from mock galaxy catalogs to jackknife re-sampling methods. We identify significant differences in the structure of the covariance. However, the impact of these discrepancies appears to be mitigated by an eigenmode analysis that can account for the noisy, unresolved modes. Our joint analysis of both redshift space and projected measurements allows us to identify systematic effects affecting constraints from the 3PCF.

    Original languageEnglish (US)
    Article number85
    JournalAstrophysical Journal
    Volume739
    Issue number2
    DOIs
    StatePublished - Oct 1 2011

    Fingerprint

    galaxies
    error analysis
    tracer
    sampling
    catalogs
    tracers
    inspection
    estimates
    configurations
    analysis
    effect
    method
    parameter

    Keywords

    • cosmology: observations
    • galaxies: statistics
    • large-scale structure of universe

    ASJC Scopus subject areas

    • Space and Planetary Science
    • Astronomy and Astrophysics

    Cite this

    McBride, C. K., Connolly, A. J., Gardner, J. P., Scranton, R., Scoccimarro, R., Berlind, A. A., ... Schneider, D. P. (2011). Three-point correlation functions of SDSS galaxies: Constraining galaxy-mass bias. Astrophysical Journal, 739(2), [85]. https://doi.org/10.1088/0004-637X/739/2/85

    Three-point correlation functions of SDSS galaxies : Constraining galaxy-mass bias. / McBride, Cameron K.; Connolly, Andrew J.; Gardner, Jeffrey P.; Scranton, Ryan; Scoccimarro, Román; Berlind, Andreas A.; Marín, Felipe; Schneider, Donald P.

    In: Astrophysical Journal, Vol. 739, No. 2, 85, 01.10.2011.

    Research output: Contribution to journalArticle

    McBride, CK, Connolly, AJ, Gardner, JP, Scranton, R, Scoccimarro, R, Berlind, AA, Marín, F & Schneider, DP 2011, 'Three-point correlation functions of SDSS galaxies: Constraining galaxy-mass bias', Astrophysical Journal, vol. 739, no. 2, 85. https://doi.org/10.1088/0004-637X/739/2/85
    McBride CK, Connolly AJ, Gardner JP, Scranton R, Scoccimarro R, Berlind AA et al. Three-point correlation functions of SDSS galaxies: Constraining galaxy-mass bias. Astrophysical Journal. 2011 Oct 1;739(2). 85. https://doi.org/10.1088/0004-637X/739/2/85
    McBride, Cameron K. ; Connolly, Andrew J. ; Gardner, Jeffrey P. ; Scranton, Ryan ; Scoccimarro, Román ; Berlind, Andreas A. ; Marín, Felipe ; Schneider, Donald P. / Three-point correlation functions of SDSS galaxies : Constraining galaxy-mass bias. In: Astrophysical Journal. 2011 ; Vol. 739, No. 2.
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