Titre :

A full sky, low foreground, high resolution CMB map from WMAP

Auteur(s) :

Delabrouille, J. [Auteur]
APC - Gravitation [APC-Gravitation]
Cardoso, J.-F. [Auteur]
APC - Gravitation [APC-Gravitation]
Laboratoire Traitement et Communication de l'Information [LTCI]
Le Jeune, M. [Auteur]
AstroParticule et Cosmologie [APC (UMR_7164)]
Betoule, M. [Auteur]
AstroParticule et Cosmologie [APC (UMR_7164)]
Fay, G. [Auteur]
AstroParticule et Cosmologie [APC (UMR_7164)]
Laboratoire Paul Painlevé - UMR 8524 [LPP]
Guilloux, F. [Auteur]
AstroParticule et Cosmologie [APC (UMR_7164)]
Laboratoire de Probabilités et Modèles Aléatoires [LPMA]
Modélisation aléatoire de Paris X [MODAL'X]

Titre de la revue :

Astronomy and Astrophysics - A&A

Pagination :

835-857

Éditeur :

EDP Sciences

Date de publication :

2009-01

ISSN :

0004-6361

Mot(s)-clé(s) en anglais :

cosmology: cosmic microwave background
methods: data analysis

Discipline(s) HAL :

Physique [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
Planète et Univers [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]

Résumé en anglais : [en]

Context: The WMAP satellite has made available high quality maps of the sky in five frequency bands ranging from 22 to 94 GHz, with the main scientific objective of studying the anisotropies of the Cosmic Microwave Background ...
Lire la suite >Context: The WMAP satellite has made available high quality maps of the sky in five frequency bands ranging from 22 to 94 GHz, with the main scientific objective of studying the anisotropies of the Cosmic Microwave Background (CMB). These maps, however, contain a mixture of emission from various astrophysical origin, superimposed on CMB emission. Aims: The objective of the present work is to make a high resolution CMB map in which contamination by such galactic and extra-galactic foreground emissions, as well as by instrumental noise, is as low as possible. Methods: The method used is an implementation of a constrained linear combination of the channels with minimum error variance, and of Wiener filtering, on a frame of spherical wavelets called needlets, allowing localised filtering in both pixel space and harmonic space. Results: We obtain a low contamination low noise CMB map at the resolution of the WMAP W channel, which can be used for a range of scientific studies. We obtain also a Wiener-filtered version with minimal integrated error. Conclusions: The resulting CMB maps offer significantly better rejection of galactic foreground than previous CMB maps from WMAP data. They can be considered as the most precise full-sky CMB temperature maps to date.Lire moins >

Langue :

Anglais

Vulgarisation :

Non

Collections :

• Laboratoire Paul Painlevé - UMR 8524

Source :

Harvested from HAL