Modeling the three-point correlation function

Details Modeling the three-point correlation function Modeling the three-point correlation function

2007-04-02

arxiv.org/abs/0704.0255v2

Astrophys.J.672:849-860,2008

Astronomy and Astrophysics

Astrophysics

12 pages, 11 figures, ApJ accepted. Corrected typos, minor changes from referee comments

Scientific paper

10.1086/523628

We present new predictions for the galaxy three-point correlation function (3PCF) using high-resolution dissipationless cosmological simulations of a flat LCDM Universe which resolve galaxy-size halos and subhalos. We create realistic mock galaxy catalogs by assigning luminosities and colors to dark matter halos and subhalos, and we measure the reduced 3PCF as a function of luminosity and color in both real and redshift space. As galaxy luminosity and color are varied, we find small differences in the amplitude and shape dependence of the reduced 3PCF, at a level qualitatively consistent with recent measurements from the SDSS and 2dFGRS. We confirm that discrepancies between previous 3PCF measurements can be explained in part by differences in binning choices. We explore the degree to which a simple local bias model can fit the simulated 3PCF. The agreement between the model predictions and galaxy 3PCF measurements lends further credence to the straightforward association of galaxies with CDM halos and subhalos.

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