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<dc:title xml:lang="en">Analyzing the millimeter to centimter emisison of nearby galaxies</dc:title>
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<dc:subject xml:lang="fr">Émission de poussières</dc:subject>
<dc:subject xml:lang="fr">Distribution spectrale d’énergie</dc:subject>
<dc:subject xml:lang="fr">Émission micro-onde anormale</dc:subject>
<dc:subject xml:lang="fr">Fluctuations du CMB</dc:subject>
<dc:subject xml:lang="fr">Galaxies proches</dc:subject>
<dc:subject xml:lang="en">Dust emission</dc:subject>
<dc:subject xml:lang="en">Spectral energy distribution</dc:subject>
<dc:subject xml:lang="en">Anomalous microwave emission</dc:subject>
<dc:subject xml:lang="en">CMB fluctuations</dc:subject>
<dc:subject xml:lang="en">Nearby galaxies</dc:subject>
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<dcterms:abstract xml:lang="fr">Cette thèse porte sur l’émission des galaxies proches dans le domaine mm à cm, encore peu exploré. À partir des données des satellites IRAS, Planck, WMAP et COBE-DIRBE, j’ai étudié l’émission de six galaxies (M31, M33, NGC253, NGC4945, LMC et SMC) dans 18 bandes, de 97µm à 13mm, en prenant en compte les émissions d’avant et d’arrière-plan. La modélisation de cette émission montre de fortes dégénérescences qui compliquent la séparation des composantes. De plus, des fluctuations CMB positives sont inférées dans 5/6 galaxies, probablement liées à ces dégénérescences ou à la distribution spatiale du CMB couplée à la résolution de 1 ◦ et au faible échantillon. L’étude d’un échantillon de galaxies plus grandes mais limité aux longueurs d’ondes plus courtes me permet d’explorer les variations d’émissivité des poussières à grandes longueurs d’ondes et posent des éléments de comparaison pour les galaxies plus lointaines, en attente de données à plus haute résolution</dcterms:abstract>
<dcterms:abstract xml:lang="en">This thesis focuses on the emission of nearby galaxies in the mm to cm range, which is still relativelyunexplored. Using data from the IRAS, Planck, WMAP and COBE-DIRBE satellites, I studied theemission of six galaxies (M31, M33, NGC253, NGC4945, LMC and SMC) in 18 bands, from 97µmto 13mm, taking into account foreground and background emission. Modeling of this emission shows strong degeneracies that hinder component separation. In addition, positive CMB fluctuations are inferred in 5/6 galaxies, likely linked to these degeneracies or to the spatial distribution of the CMB coupled with the 1° resolution and small sample, highlighting the need for a larger, higher-resolution sample. Studying a sample of larger galaxies at shorter wavelengths allows me to explore variations in dust emissivity at longer wavelengths, and provides a basis for comparison with more distant galaxies, awaiting higher-resolution data.</dcterms:abstract>
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