Publication : t01/143

Patterns in the weak shear 3-point correlation function

Bernardeau F. (CEA, DSM, SPhT (Service de Physique Théorique), F-91191 Gif-sur-Yvette, FRANCE)
Van Waerbeke L. (Institut d\'Astrophysique de Paris (IAP), 98 bis Bld Arago, F-75014 Paris, FRANCE, and CITA, Toronto, CANADA)
Mellier Y. (Institut d\'Astrophysique de Paris (IAP-CNRS), 98 bis Bld Arago, F-75014 Paris, FRANCE)
We explore the scale and angular dependence of the cosmic shear three-point correlation function. The shear field is found to have a much more complex three-point function than the convergence field, but it also exhibits specific motifs which draw signatures of gravitational lensing. Exact shear patterns are inferred analytically for some geometrical shear triplets configurations, when simple interpretations can be derived. A more complete description of their geometrical properties has then been carried out from ray-tracing numerical simulations and simple models. These patterns reveal typical features that can be utilized for non-gaussian signal detection in cosmic shear surveys. We test the robustness of these properties against complex noise statistics and non-trivial survey topologies. From these conclusive checks, we predict that the VIRMOS-DESCART survey should allow a detection of a non-gaussian signal with a comfortable significance for a low matter density Universe.
Année de publication : 2003
Revue : Astron. Astrophys. 397 405-414 (2003)
Preprint : arXiv:astro-ph/0201029
Lien : aa2242/aa2242.html
Numéro Exterieur : Code Bibliographique ADS : 2003A&A...397..405B
Langue : Anglais

Fichier(s) à télécharger :
  • publi.pdf


    Retour en haut