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Etude des propriétés physiques de galaxies vues par Herschel

Abstract : The Herschel Reference Survey (Boselli et al. 2010b) is a guaranteed time key project aimed at studying the physical properties of the interstellar medium (ISM) of 323 nearby galaxies, covered by multi-wavelength data. This volume limited, K-band selected sample is composed of galaxies spanning the whole range of morphological types (from ellipticals to late-type spirals) and environments (from the field to the centre of the Virgo Cluster). My PhD work consists in performing a precise submillimeter photometry of every galaxies of the survey, and conducting a statistical study on the ISM properties of nearby galaxies based on the analysis of their spectral energy distributions. To achieve this goal I fit the data with the models of Draine & Li (2007). The output of Draine & Li (2007) models are the intensity of the interstellar radiation field, the PAH abundance, the contribution of photodissociation regions, the total mass of dust. I study the relations between these outputs and the physical properties such as the stellar mass, the specific star formation rate, the metallicity or the morphological type. I will present a preliminary analysis of these relations leading to a better understanding of the processes at play in the ISM and provide new infrared sets of templates from 8 to 500 microns parameterized by all the physical parameters just cited. These templates calibrated on nearby galaxies will be a benchmark for the study of the ISM properties of high redshift galaxies.
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Contributor : Laure Ciesla <>
Submitted on : Wednesday, December 12, 2012 - 11:36:47 AM
Last modification on : Thursday, July 25, 2019 - 4:34:13 PM
Long-term archiving on: : Sunday, December 18, 2016 - 12:05:48 AM

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Laure Ciesla. Etude des propriétés physiques de galaxies vues par Herschel. Cosmologie et astrophysique extra-galactique [astro-ph.CO]. Université de Provence - Aix-Marseille I, 2012. Français. ⟨tel-00763851⟩

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