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Simulations numériques chemodynamiques de la formation et de l'évolution des galaxies

Abstract : Galaxies are complex systems where dynamics and chemical evolution are closely linked. In order to study the formation and the evolution of galaxies, we have developed a new chemodynamical code in which dynamics and chemical evolution are modelled in a self-consistent way. Our code describes the interstellar medium, the main physical processes of the ISM and the interaction with stars. Stellar evolution and feedback are modelled with a non-instantaneous recycling approach. One original feature of our code is the record of the evolution of individual abundances for several chemical elements. This allows us to compute the radiative cooling of the gas according to its chemical composition. We can also study the temporal and spatial evolution of chemical composition and chemical gradients.

The first tests highlight the importance of individual chemical abundances tracking and its influence on gas cooling, and also on star formation and chemical enrichment histories. Furthermore, with our two-phased ISM model, we can reproduce a three-media ISM matching the observations. The slope of the cluster initial mass function is also close to observations. Finally, our new chemodynamical code allows us to study the different physical processes leading to the evolution of galaxies on both dynamical and chemical points of view.
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https://tel.archives-ouvertes.fr/tel-00260726
Contributor : Nicolas Champavert <>
Submitted on : Tuesday, March 4, 2008 - 11:14:43 PM
Last modification on : Wednesday, November 20, 2019 - 3:06:40 AM
Long-term archiving on: : Friday, September 28, 2012 - 10:40:12 AM

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  • HAL Id : tel-00260726, version 1

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Nicolas Champavert. Simulations numériques chemodynamiques de la formation et de l'évolution des galaxies. Astrophysique [astro-ph]. Université Claude Bernard - Lyon I, 2007. Français. ⟨tel-00260726⟩

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