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<dc:title xml:lang="fr">Le gaz dans les galaxies spirales de l'univers local : modélisation d'observations radio et étude des lois de formation stellaire dans les galaxies perturbées</dc:title>
<dcterms:alternative xml:lang="en">The gas of spirals galaxies in the local universe : simulations of radio observations and study of the star formation laws in perturbed galaxies</dcterms:alternative>
<dc:subject xml:lang="fr">Galaxies</dc:subject>
<dc:subject xml:lang="fr">Formation</dc:subject>
<dc:subject xml:lang="fr">Evolution</dc:subject>
<dc:subject xml:lang="fr">Milieu interstellaire (MIS)</dc:subject>
<dc:subject xml:lang="fr">Astrophysique</dc:subject>
<dc:subject xml:lang="en">Galaxies</dc:subject>
<dc:subject xml:lang="en">Formation</dc:subject>
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<dcterms:abstract xml:lang="fr">Le milieu interstellaire (MIS) des galaxies spirales joue un rôle primordial dans l'évolution des galaxies. Nous nous sommes attachés au cours de cette thèse à caractériser le lien existant entre le MIS dans les galaxies spirales et l'efficacité de la formation stellaire. Dans une première partie, nous étudions la morphologie du disque de gaz atomique de la galaxie spirale fortement inclinée NGC 2683, à l'aide d'un modèle de déprojection de cubes de données radio. Cette étude permet notamment de rendre compte de l'histoire d'accrétion de gaz dans ce système. Dans une seconde partie, nous nous intéressons aux conséquences de la compression du MIS qui peut avoir lieu dans des galaxies situées dans des environnements denses. Notre approche fait usage à la fois de données multilongueur d'onde de galaxies subissant la compression de leur MIS (avec notamment de nouvelles observations millimétriques), de simulations dynamiques de ces galaxies ainsi que d'un modèle analytique donnant accès à la physique aux petites échelles. Notre thèse montre la complémentarité de l'utilisation d'observations, de la modélisation de ces observations et de simulations dynamiques dans l'étude du MIS des galaxies spirales.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The interstellar medium (ISM) of spiral galaxies plays a key role in galaxy evolution. Throughout this thesis we characterized the link between the ISM of spiral galaxies and the star formation efficiency. In a first part, we studied the atomic gas distribution of the highly inclined spiral galaxy NGC 2683, with a deprojection model of radio data cubes. This study gives insight on the gas accretion history in this galaxy. In a second part of this work, we examined the compression effects of the ISM, which occurs in galaxies located in dense environment. Our approach makes use of both a multiwavelength data set of galaxies enduring ISM compression (including new millimeter observations), and dynamical simulations of these galaxies combined with an analytical model which gives access to small scale physics. Our thesis shows the complementarity of high quality observations together with modelisation of these observations and dynamical simulations in the study of the ISM in spiral galaxies.</dcterms:abstract>
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