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Caractériser le milieu interstellaire : un clé pour comprendre l'Univers

Abstract : What is there in common between the detection of atomic carbon at a redshift of 4, 1"-mapping of the 12CO(1-0) of the whirpool galaxy (M51), the study of the Galactic foreground emission in Planck data, and the kinematic study of the molecular disk and outflow of the HH30 proto-star? Beyond the fact that all these observations are done at (sub-)millimeter wavelengths, they are linked through the physical and chemical processes of the interstellar medium. Characterizing these processes permits us to understand the most diverse objects of the universe near and far and from smallest to largest. I describe here one decade of work directed toward understanding of the interstellar medium. I start with the description of two of the approaches I took. The first concerns the characterization of one of the less well-understood step in the gas on its way to form stars, the transition from HI to H2. I show how the interpretation of the 12CO(1-0) emission relates to cold dense gas as well as warm diffuse gas. Second, I present the need for and the making of an observational benchmark (the Horsehead Mane) for complex photo-chemical models, which are subsequently used in the contexts mentioned above. The decade to come promises to be as fruitful as the last one, for several reasons. The community studying the interstellar medium increasingly organizes itself around large projects. On my own part, I am the PI of the SCHISM ANR grant (Structure and CHemistry of the InterStellar Medium) that brings together observers, numerical specialists and theoreticians mainly from IRAM and the Observatoire de Paris. Moreover, radio instrumentation is making spectacular progress regarding high angular and spectral resolution spectro-imaging. IRAM has a preponderant role in these challenges to which I contribute software development and algorithms. Finally, I participate in the maturation of new instruments such as single-dish wide-field cameras and the ALMA and NOEMA interferometers. The conjonction of the factors will contribute to bring to light the origins of the galaxies, stars, planetary systems and pre-biotic molecules.
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https://tel.archives-ouvertes.fr/tel-00726959
Contributor : Jérôme Pety <>
Submitted on : Friday, August 31, 2012 - 4:12:53 PM
Last modification on : Monday, December 14, 2020 - 9:55:08 AM
Long-term archiving on: : Friday, December 16, 2016 - 9:16:54 AM

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  • HAL Id : tel-00726959, version 1

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Jérôme Pety. Caractériser le milieu interstellaire : un clé pour comprendre l'Univers. Astrophysique galactique [astro-ph.GA]. Université Pierre et Marie Curie - Paris VI, 2012. ⟨tel-00726959⟩

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