The cosmic shear three-point functions
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 powerlaw 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.
Cite
@article{arxiv.astro-ph/0505284,
title = {The cosmic shear three-point functions},
author = {K. Benabed and R. Scoccimarro},
journal= {arXiv preprint arXiv:astro-ph/0505284},
year = {2009}
}
Comments
17 pages, 18 figures. Submitted to A&A