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<dc:title xml:lang="fr">Etude multi-longueurs d’onde d'amas globulaires pour caractériser le lien entre leur environnement et leurs propriétés</dc:title>
<dcterms:alternative xml:lang="en">Multi-wavelength study of globular clusters : characterisation of the link between their environment and their properties</dcterms:alternative>
<dc:subject xml:lang="fr">Amas globulaires</dc:subject>
<dc:subject xml:lang="fr">Galaxies</dc:subject>
<dc:subject xml:lang="fr">Formation</dc:subject>
<dc:subject xml:lang="fr">Étoiles</dc:subject>
<dc:subject xml:lang="fr">Évolution</dc:subject>
<dc:subject xml:lang="fr">Synthèse de populations stellaires</dc:subject>
<dc:subject xml:lang="en">Globular clusters</dc:subject>
<dc:subject xml:lang="en">Galaxies</dc:subject>
<dc:subject xml:lang="en">Formation</dc:subject>
<dc:subject xml:lang="en">Stars</dc:subject>
<dc:subject xml:lang="en">Evolution</dc:subject>
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<dcterms:abstract xml:lang="fr">L’étude des amas globulaires (AGs) nous offre une opportunité d’appréhender l’histoire de leurs galaxies hôtes et ainsi l’histoire de l’univers. Dans cette thèse, je me suis intéressé aux propriétés des AGs dans différents environnements. Tout d’abord, je me suis concentré sur les AGs de l’amas de la Vierge, un amas de galaxies très dense situé à environ 16,5 Mpc. J’ai utilisé les données observées par le relevé NGVS (Next Generation Virgo Survey) pour définir un échantillon qui contient 1846AGs. J’ai ensuite comparé les couleurs de ces amas avec celles d’autres AGs originaires de la Voie Lactée et j’ai remarqué des différences de couleurs encore jamais observées, dont la nature exacte est encore énigmatique. Pour comprendre ces différences, j’ai ensuite comparé les AGs observés avec des AGs synthétiques basés sur 10 modèles de synthèse de populations stellaires. J’ai aussi étudié les âges et les métallicités ressortant de la confrontation directe des couleurs des AGs à ces modèles. En conclusion, en l’état actuel, les modèles ne rendent pas compte de la diversité identifiée dans ma thèse. Finalement, j’ai effectué une brève étude des propriétés spatiales des AGs autour de M87 pour repérer des marques d’accrétion.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Through the study of the globular cluster (GC) properties, it is possible to unravel the history of their host galaxies and by extension the history of the universe. During this thesis, I was interested in the GC properties in different environments. First, I looked at the GCs in the Virgo cluster, a dense galaxy cluster located at 16.5 Mpc. I used data from the survey NGVS (Next Generation Virgo Survey) to define a sample of 1846 GCs. Then, I compared the colors of these GCs with those of Milky Way GCs and I noted color differences never yet observed, which are still enigmatic. In order to understand these differences, I compared the observed GCs with synthetic GCs obtained with 10 stellar population synthesis models. I also studied the age and metallicity predictions of those models. In the end, in their current status, the models do not account for the diversity highlighted in my thesis. Finally, I assessed the spatial properties of the GCs around M87 in order to find any signatures of a recent accretion.</dcterms:abstract>
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