ÉTUDE DE L'EXTINCTION INTERSTELLAIRE EN TROIS DIMENSIONS :
Contraintes sur la structure de la Voie Lactée

Abstract : The attenuation of starlight by interstellar dust limits our view of our own galaxy : the Milky Way. This thesis describes the cartography of this interstellar extinction in three dimensions, and shows how the resulting map can be used to constrain the structure of our Galaxy. The method used is based on the colour difference between observed stars and simulated stars from the Besançon model. This method has been applied to tens of thousand of lines of sight in order to build a three dimensional map of the dust distribution in the Milky Way. This map has been used to constrain parameters of the Galactic disc such as its warp and flare. Also, a dusty bar has been detected at the Galactic centre. Furthermore, the distance to dense clouds as well as their masses has been estimated by using the extinction distribution along the line of sight. This has been done for several hundred IRDCs, the poorly known site for massive star formation. Finally, a three dimensional map of the far infrared dust emission has been created. Regions where differences exist between observed and modelled emission can shed light on the dust grain properties in these regions.
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Contributor : Douglas Marshall <>
Submitted on : Tuesday, December 18, 2007 - 5:39:02 PM
Last modification on : Friday, April 5, 2019 - 8:14:31 PM
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Douglas Marshall. ÉTUDE DE L'EXTINCTION INTERSTELLAIRE EN TROIS DIMENSIONS :
Contraintes sur la structure de la Voie Lactée. Astrophysique [astro-ph]. Université de Franche-Comté, 2006. Français. ⟨tel-00199346⟩

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