Volume 456, Number 2, September III 2006
|Page(s)||421 - 432|
|Section||Cosmology (including clusters of galaxies)|
|Published online||31 August 2006|
The cosmic shear three-point functions
Institut d'Astrophysique de Paris, 98bis bd Arago, 75014 Paris, France e-mail: email@example.com
2 Center for Cosmology and Particule Physics, Department of Physics, New York University, New York, NY 10003, USA
Accepted: 13 April 2006
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.
Key words: cosmology: large-scale structure of Universe / gravitational lensing
© ESO, 2006
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