Publication : t01/144

Detection of non-Gaussian Signatures in the VIRMOS-DESCART Lensing Survey

Bernardeau F. (CEA, DSM, SPhT (Service de Physique Théorique), F-91191 Gif-sur-Yvette, FRANCE)
Mellier Y. (Institut d\'Astrophysique de Paris (IAP-CNRS), 98 bis Bld Arago, F-75014 Paris, FRANCE)
Van Waerbeke L. (Institut d\'Astrophysique de Paris (IAP), 98 bis Bld Arago, F-75014 Paris, FRANCE, and CITA, Toronto, CANADA)
We have detected non-Gaussian signatures in the VIRMOS-DESCART weak lensing survey from a measurement of the three-point shear correlation function, following the method developed by Bernardeau et al. (2002). We obtain a 2.4-sigma signal over four independent angular bins, or equivalently, a 4.9-sigma confidence level detection with respect to measurements errors on scale of about 2 to 4 arcmin. The amplitude and the shape of the signal are consistent with theoretical expectations obtained from ray-tracing simulations. This result supports the idea that the measure corresponds to a cosmological signal due to the gravitational instability dynamics. Its properties could be used to put constraints on the cosmological parameters, in particular on the density parameter of the Universe, but the error level as well as the cosmic variance are still too large to permit secure conclusions.
Année de publication : 2002
Revue : Astrophys. J. 389 L28-L32 (2002)
Preprint : arXiv:astro-ph/0201032
Lien : aaeb271/aaeb271.html
Numéro Exterieur : Code Bibliographique ADS : 2002A&A...389L..28B
Langue : Anglais

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