The cosmic shear three-point functions

K. Benabed, R. Scoccimarro

    Research output: Contribution to journalArticle

    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 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.

    Original languageEnglish (US)
    Pages (from-to)421-432
    Number of pages12
    JournalAstronomy and Astrophysics
    Volume456
    Issue number2
    DOIs
    StatePublished - Sep 1 2006

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    Keywords

    • Cosmology: large-scale structure of Universe
    • Gravitational lensing

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

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