Weak Lensing Effects on the Galaxy Three-Point Correlation Function

Details Weak Lensing Effects on the Galaxy Three-Point Correlation Function Weak Lensing Effects on the Galaxy Three-Point Correlation Function

2008-04-02

arxiv.org/abs/0804.0373v3

Phys.Rev.D78:043513,2008

Astronomy and Astrophysics

Astrophysics

24 pages, 11 figures; version accepted for publication in Phys. Rev. D; v2: typos corrected, figure caption clarified

Scientific paper

10.1103/PhysRevD.78.043513

We study the corrections to the galaxy three-point correlation function (3PCF) induced by weak lensing magnification due to the matter distribution along the line of sight. We consistently derive all the correction terms arising up to second order in perturbation theory and provide analytic expressions as well as order of magnitude estimates for their relative importance. The magnification contributions depend on the geometry of the projected triangle on the sky plane, and scale with different powers of the number count slope and redshift of the galaxy sample considered. We evaluate all terms numerically and show that, depending on the triangle configuration as well as the galaxy sample considered, weak lensing can in general significantly contribute to and alter the three-point correlation function observed through galaxy and quasar catalogs.

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