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Theses

Détection de l'effet de lentille gravitationnelle dans les données de Planck-HFI

Abstract : The Planck satellite is the third generation experement dedicated to the observation of the cosmic microwave backgroud (CMB). The resolution and sensibility of its intruments allow for the first time the detection of the weak lensing effect on CMB. This thesis present a original detection method of this effect in the data of the HFI instrument of Planck.The first part give a general description of the standard model of cosmology et the physics of the CMB. The part then presents the details of the weak lensing effect, concentrating on its impact on the CMB observables. This part ends with a description of the Planck satellite and its instruments.The second part, discribes the set of simulations and analysis tools that I have developed allowding me to make the first mesureament of the weak lensing effect on CMB. It presents the original method that I used which is based on a patch analysis of the full sky data, that is able to only take into account the less contaminated regions. This part also present the caracterisation of the lensing potential estimator for masked maps in the presence of inhomogeneous noise and introduce a method, based on Monte-Carlo simulations, that is used to correct for the biais produced by the analysis method.The last part, concentrates on the work on HFI data. The first chapter presents the application of the above method to the maps of the combined observations at 143GHz and 217GHz and the maps from component separation using GMCA algorithm. The results show a deflection power spectrum compatible with the one expect in a lambda CMB universe, calculated with the cosmological parameters estimated by WMAP including seven years of observations. Using the points, from the combined estimation from the 143GHz and 217GHz maps, for multipole smaller than 500, gives a 1.26 Chi2 by degree of freedom. Finally, the last chapter presents the comression algorithm used onboard to compression HFI data. It gives the details of the tunning and the following of the compression parameters and the data rate, since the launch and summarize the results on the compression errors
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Alexis Lavabre. Détection de l'effet de lentille gravitationnelle dans les données de Planck-HFI. Autre. Université Paris Sud - Paris XI, 2011. Français. ⟨NNT : 2011PA112060⟩. ⟨tel-00923133⟩

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