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Properties of the interstellar medium of the star-forming galaxy, IC10, at various spatial scales

Abstract : The properties of the Interstellar Medium (ISM) strongly influence the environment and processes that lead to star-formation, which in turn, drives the evolution of a galaxy. Dwarf galaxies in the Local Group are perfect laboratories to investigate how the metal-poor ISM affects the interplay between gas, dust and stars. In this thesis, I investigate the properties of the HII regions and the diffuse ionized gas of the nearby dwarf galaxy IC10, which has a metallicity of 1/3 solar. Its proximity (d=700 kpc) enables the analysis on different spatial scales: from the compact clumps (~25 pc) to the whole star-forming body of the galaxy (~650pc). In order to measure the physical properties of the ISM, I model the infrared emission lines observed with Spitzer and Herschel with photoionization and photodissociation models. I present an extensive exploration of different methods to determine the most reliable ISM properties, based on the available constraints. I determined the properties of the brightest star-forming clumps within the galaxy and show that the emission at large scales (~300 pc) is dominated by that of the compact, bright clumps that lie within the region. I further demonstrate the need for a multi-component model to fully reproduce the observations.
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Submitted on : Thursday, March 15, 2018 - 3:20:08 PM
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  • HAL Id : tel-01735178, version 1

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Fiorella Lucia Polles. Properties of the interstellar medium of the star-forming galaxy, IC10, at various spatial scales. Cosmology and Extra-Galactic Astrophysics [astro-ph.CO]. Université Paris-Saclay, 2017. English. ⟨NNT : 2017SACLS276⟩. ⟨tel-01735178⟩

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