Multi-wavelength study of normal and starburst galaxies in the local universe
Description
The topic of this Ph.D. dissertation is the modelling of the spectral energy distribution of normal and starburst galaxies in the local universe. It consisted in the creation of a homogeneous multi-wavelength database, a infrared library of spectra and the study of a global parameter, the size of the star-forming region. After showing that the radio continuum size is its best estimator because of its reliability and its observation low cost, I established a relation that relates the star-forming size, the infrared luminosity and the effective temperature of the big grains. I then explored the physical processes giving raise to this relation and showed that it can be derived from the Schmidt law, which related the star formation rate per surface unit to the gas surface density. Finally, I showed that the introduction of this parameter enables the determination of 1) the attenuation of the stellar intrinsic light by the dust given the total mass and metallicity of the gas and 2) the infrared spectral energy distribution by using the LIR-Td-R relation, given a library of infrared spectra depending on the effective dust temperature. (author)
Abstract (French)
Cette these a pour objet la modelisation spectrophotometrique des galaxies normales et a flambees d'etoiles de l'Univers local. Elle a consiste en la creation d'une base de donnee multi-longueur d'onde homogene, d'une bibliotheque de spectres infrarouges et a l'etude d'un parametre global, la taille caracteristique de la region de formation d'etoiles. Apres avoir montre que la taille continuum radio est son meilleur estimateur par sa fiabilite et son faible cout observationnel, j'ai mis a jour une relation liant ce parametre, la luminosite infrarouge et la temperature efficace des gros grains et ai explore les processus physiques donnant lieu a cette relation et montre qu'elle peut etre derivee a partir de la loi de Schmidt reliant le taux de formation d'etoiles surfacique a la densite surfacique de gaz. Enfin, j'ai montre que l'introduction de ce parametre permet de determiner simultanement d'une part l'attenuation de la lumiere intrinseque des etoiles par la poussiere connaissant la masse totale et la metallicite du gaz et d'autre part la distribution d'energie spectrale infrarouge a partir de la bibliotheque de spectres infrarouges et l'utilisation de la relation LIR-Td-RFiles
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Additional details
Additional titles
- Original title (French)
- Etude multi-longueurs d'ondes des galaxies normales et a flambees d'etoiles de l'univers local
Identifiers
Publishing Information
- Imprint Pagination
- 185 p.
- Report number
- FRCEA-TH--8771
INIS
- Country of Publication
- France
- Country of Input or Organization
- France
- INIS RN
- 49048970
- Subject category
- S79: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;
- Resource subtype / Literary indicator
- Thesis
- Descriptors DEI
- DATA COMPILATION; DUSTS; ENERGY SPECTRA; GASES; INFRARED SPECTRA; LIBRARIES; METALLICITY; STARS
- Descriptors DEC
- DATA; DATA PROCESSING; FLUIDS; INFORMATION; PROCESSING; SPECTRA
Optional Information
- Notes
- 284 refs.; Available from the INIS Liaison Officer for France, see the INIS website for current contact and E-mail addresses; Also available from http://bibliotheque.univ-paris-diderot.fr/ (France)
- Secondary number(s)
- CEA-DAPNIA--03-14-T