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Cosmologie observationnelle avec le satellite PLANCK : modélisation des émissions galactiques polarisées

Abstract : This thesis is dedicated to the Cosmic Microwave Background (CMB) anisotropies measurement and to the caracterisation of the foreground Galactic emissions. This work is in the framework of the Planck satellite data analysis preparation. First, this thesis give a description of the Big Bang model and of the CMB physics. Then, we present the Archeops, WMAP and PLANCK experiments and their data analysis. Part two is devoted to the description of the diffuse Galactic synchrotron, free-free and thermal dust emissions and to the study of those emissions in the Galactic plane. Using comparison between our simulations and the WMAP, Archeops and IRIS data we are able to provide partial maps of the spatial variations of the dust grain temperature and of the spectral index of the synchrotron and thermal dust emissions. Third part is dedicated to the study of the two main polarized Galactic emissions : synchrotron and thermal dust emissions. We evaluate effective models based on template maps. We also build physical model based on physics for these emissions that is to say shape of the Galactic magnetic field and matter density in our Galaxy. Using maps and Galactic profiles, we compare our simulations of these emissions to the Archeops and WMAP data. Thanks to that we are able to provide for the first time a coherent model of the synchrotron and thermal dust emissions. Then we propose a method to improved the constraints on our model using the PLANCK data. Finally the last part focuses on the angular power spectra of the polarized Galactic emissions. We estimate the contamination due to these foreground emissions on the CMB signal. In addition we propose a method to minimize the contamination of the CMB PLANCK data by the thermal dust emission using masks.
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https://tel.archives-ouvertes.fr/tel-00564700
Contributor : Lauranne Fauvet <>
Submitted on : Wednesday, February 9, 2011 - 4:50:21 PM
Last modification on : Thursday, November 19, 2020 - 12:58:54 PM
Long-term archiving on: : Tuesday, May 10, 2011 - 3:21:09 AM

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  • HAL Id : tel-00564700, version 1

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IN2P3 | LPSC | CNRS | UJF | GEPI | UGA

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Lauranne Fauvet. Cosmologie observationnelle avec le satellite PLANCK : modélisation des émissions galactiques polarisées. Cosmologie et astrophysique extra-galactique [astro-ph.CO]. Université Joseph-Fourier - Grenoble I, 2010. Français. ⟨tel-00564700⟩

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