Journal
ASTRONOMY & ASTROPHYSICS
Volume 456, Issue 2, Pages 421-U16Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20054125
Keywords
cosmology : large-scale structure of Universe; gravitational lensing
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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.
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