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Analysis of dust emission in nearby galaxies : implications of the modeling assumptions

Abstract : My thesis focused on the implications of dust emission modelisation choices on its derived properties in nearby galaxies. A first approach showed that all models do not fit observations of two nearby galaxies adequately and similarly, although they all managed to fit the Milky Way infrared emission. It also highlighted that the dust composition is not the same between those two galaxies, and also with that of the Milky Way. The choice of the dust grains environment, through the incident radiation field, can significantly impact results like the total dust masses. A second project investigated the systematics errors due to the empirical laws used to describe the radiation field that heats the dust grains. I showed that some parameters can be over- or underestimated, while showing good fits to the observations. These results show that it is important to take into consideration the choices made for modelisation in order to accurately determine dust properties in nearby galaxies.
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Submitted on : Monday, February 26, 2018 - 3:40:04 PM
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Jérémy Chastenet. Analysis of dust emission in nearby galaxies : implications of the modeling assumptions. Solar and Stellar Astrophysics [astro-ph.SR]. Université de Strasbourg, 2017. English. ⟨NNT : 2017STRAE011⟩. ⟨tel-01717624⟩

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