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12 arcmin.) over a large fraction (30%) of the sky in the (sub)millimetre domain (from 143 to 545 GHz). We describe the results obtained during the last flight: the Archeops estimate of the CMB angular power spectrum, linking for the first time Cobe scales and the first acoustic peak, consequences in terms of cosmological parameters favouring a flat-Λ Universe. We also present the first measurement of galactic dust polarization and accurate maps of the galactic plane diffuse (sub) millimetre emisson. 
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doi:10.1016/j.crhy.2003.09.005 
Copyright © 2003 Académie des sciences. Published by Éditions scientifiques et médicales Elsevier SAS.
The Cosmic Microwave Background/Le rayonnement fossile à 3K
Cosmological parameter estimation: methods
Estimation des paramètres cosmologiques : des méthodes
Marian Douspis
Available online 28 October 2003.
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Abstract
CMB anisotropy data could put powerful constraints on theories of the evolution of our Universe. Using the observations of the large number of CMB experiments, many studies have put constraints on cosmological parameters assuming different frameworks. Assuming for example inflationary paradigm, one can compute the confidence intervals on the different components of the energy densities, or the age of the Universe, inferred by the current set of CMB observations. The aim of this Note is to present some of the available methods to derive the cosmological parameters with their confidence intervals from the CMB data, as well as some practical issues to investigate large number of parameters. To cite this article: M. Douspis, C. R. Physique 4 (2003).
Résumé
Les observations des anisotropies du fond diffus cosmologique (FDC) peuvent placer de fortes contraintes sur les théories d'évolution de notre Univers. L'utilisation de telles données a permis de contraindre differents paramètres de différents cadres théoriques : l'age de l'Univers, son contenu baryonique, etc. Le but de cette contribution est de présenter differentes méthodes possibles pour extraire les paramètres cosmologiques et leurs intervalles de confiance des données du FDC. Des questions pratiques sur l'utilisation de grands nombres de paramètres sont aussi abordées. Pour citer cet article : M. Douspis, C. R. Physique 4 (2003).
Author Keywords: Cosmic Microwave Background anisotropies; Cosmology; Early UniverseAnisotropies du fond de rayonnement cosmique; Cosmologie; Univers primordial
