The cosmic shear three-point functions

K. Benabed; R. Scoccimarro

doi:10.1051/0004-6361:20054125

The cosmic shear three-point functions

K. Benabed, R. Scoccimarro

Research output: Contribution to journal › Article › peer-review

Abstract

We investigate the three-point functions of the weak lensing cosmic shear, using both analytic methods and numerical results from N-body simulations. The analytic model, an isolated dark matter halo with a power-law profile chosen to fit the effective index at the scale probed, can be used to understand the basic properties of the eight three-point functions observed in simulations. We use this model to construct a single three-point function estimator that "optimally" combines the eight three-point functions. This new estimator is an alternative to M_ap statistics and provides up to a factor of two improvement in signal to noise compared to previously used combinations of cosmic shear three-point functions.

Original language	English (US)
Pages (from-to)	421-432
Number of pages	12
Journal	Astronomy and Astrophysics
Volume	456
Issue number	2
DOIs	https://doi.org/10.1051/0004-6361:20054125
State	Published - Sep 2006

Keywords

Cosmology: large-scale structure of Universe
Gravitational lensing

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1051/0004-6361:20054125

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AB - We investigate the three-point functions of the weak lensing cosmic shear, using both analytic methods and numerical results from N-body simulations. The analytic model, an isolated dark matter halo with a power-law profile chosen to fit the effective index at the scale probed, can be used to understand the basic properties of the eight three-point functions observed in simulations. We use this model to construct a single three-point function estimator that "optimally" combines the eight three-point functions. This new estimator is an alternative to Map statistics and provides up to a factor of two improvement in signal to noise compared to previously used combinations of cosmic shear three-point functions.

KW - Cosmology: large-scale structure of Universe

KW - Gravitational lensing

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The cosmic shear three-point functions

Abstract

Keywords

ASJC Scopus subject areas

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