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Theses

Analyse multi-composantes d'observations du fond diffus cosmologique

Abstract : Cosmic Microwave Background (CMB) anisotropies contain a wealth of information about physics in the primordial universe. Their spatial power spectrum depends on cosmological parameters which characterise the matter and energy contents of the Universe as well as its evolution. Precise measurement of the CMB power spectrum requires the separation of astrophysical foreground emissions present in the submillimeter range of the spectrum. After a short presentation of the standard model of cosmology and of the different foreground emissions in millimeter wavelengths, we present a survey of the existing component separation methods. In this thesis, we improve and extend these methods in several respects. First, these methods are based on a simplified model and do not allow the efficient separation of intrumental components correlated between detectors. We improve the component separation methods for the processing of such systematic effects. This technique is tested on simulations of observation for the Planck satellite. Secondly, "standard" component separation methods are not fully satisfactory because they are not optimized for power spectra estimation, and because they require perfect knowledge of the components electromagnetic spectra. We describe a new blind multi-component power spectra estimation method. This approach is also tested on Planck observation simulations. In the last part of this thesis, we describe the Archeops experiment and we apply our blind component separation method to Archeops data.
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https://tel.archives-ouvertes.fr/tel-00004512
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Submitted on : Thursday, February 5, 2004 - 11:02:27 AM
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  • HAL Id : tel-00004512, version 1

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Guillaume Patanchon. Analyse multi-composantes d'observations du fond diffus cosmologique. Cosmologie et astrophysique extra-galactique [astro-ph.CO]. Université Pierre et Marie Curie - Paris VI, 2003. Français. ⟨tel-00004512⟩

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