Skip to Main content Skip to Navigation
Theses

Influence of baryonic physics in simulations of disc galaxies

Abstract : The modelling of baryonic physics in numerical simulations of disc galaxies allows to study the evolution of the diff erent components, the physical state of the gas and the star formation. The present work aims at investigating in particular the role of the cold and dense molecular phase, which could play a role of gas reservoir in the outer galaxy discs, with low star formation e fficiency. After a presentation of galaxies with a focus on spiral galaxies, their interstellar medium and dynamical evolution, we review the current state of hydro dynamical numerical simulations and the implementation of baryonic physics. We then present the simulations we performed. These include cooling to low temperatures, and a molecular hydrogen component. We especially test the impact of the presence of molecular hydrogen in simulations with several feedback e fficiencies, and fi nd that the molecular hydrogen allows in all cases some slow stellar formation to occur in the outer disc, with an e ffect on the vertical structure of the disc that is sensitive to the feedback e fficiency. Molecular hydrogen is therefore able to play the role of gas reservoir in external parts of spiral galaxies, which accrete gas from cosmic filaments all along their lives.
Complete list of metadatas

Cited literature [3 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-00924468
Contributor : Anaëlle Hallé <>
Submitted on : Monday, January 6, 2014 - 6:39:34 PM
Last modification on : Thursday, December 10, 2020 - 12:36:34 PM
Long-term archiving on: : Thursday, April 10, 2014 - 5:35:12 PM

Identifiers

  • HAL Id : tel-00924468, version 1

Citation

Anaëlle Hallé. Influence of baryonic physics in simulations of disc galaxies. Cosmology and Extra-Galactic Astrophysics [astro-ph.CO]. Université Pierre et Marie Curie - Paris VI, 2013. English. ⟨tel-00924468⟩

Share

Metrics

Record views

386

Files downloads

433