Publication : t04/109
Constraints on mode couplings and modulation of the CMB with WMAP data
Prunet S. (Institut d\'Astrophysique de Paris (IAP-CNRS), 98 bis Bld Arago, F-75014 Paris, FRANCE)Uzan J.-P. (Laboratoire de Physique Théorique (LPT), CNRS, UMR 8627, Université de Paris-Sud XI, F-91405 Orsay, France)
Bernardeau F. (CEA, DSM, SPhT (Service de Physique Théorique), F-91191 Gif-sur-Yvette, FRANCE)
Brunier T. (CEA, DSM, SPhT (Service de Physique Théorique), F-91191 Gif-sur-Yvette, FRANCE)
Abstract:Année de publication : 2005
We investigate a possible asymmetry in the statistical properties of the cosmic microwave background temperature field and to do so we construct an estimator aiming at detecting a dipolar modulation. Such a modulation is found to induce correlations between multipoles with $\Delta\ell=1$. Applying this estimator, to the V and W bands of the WMAP data, we found a significant detection in the V band. We argue however that foregrounds and in particular point sources are the origin of this signal.
Revue : Phys. Rev. D 71 083508 (2005)
DOI : 10.1103/PhysRevD.71.083508
Preprint : arXiv:astro-ph/0406364
Lien : http://link.aps.org/abstract/PRD/v71/e083508
Keywords : Cosmologie; Fond diffus cosmologique
Langue : Anglais
Fichier(s) à télécharger :
publi.pdf
