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:
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.
Année de publication : 2005
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