Chemical and dynamical evolution in gas-rich dwarf galaxies
Abstract
We study the effect of a single, instantaneous starburst in a gas-rich dwarf galaxy on the dynamical and chemical evolution of its interstellar medium. We consider the energetic input and the chemical yields originating from SNeII, SNeIa and intermediate-mass stars. We find that a galaxy resembling IZw18 develops a galactic wind carrying out mostly the metal-rich gas. The various metals are lost differentially and the metals produced by the SNeIa are lost more efficiently than the others. As a consequence, we find larger [/Fe] ratios for the gas inside the galaxy than for the gas leaving the galaxy. Finally we find that a single burst occurring in primordial gas (without pre-enrichment), gives chemical abundances and dynamical structures in good agreement with what observed in IZw18 after 29 Myr from the beginning of star formation.
Cite
@article{arxiv.astro-ph/0002371,
title = {Chemical and dynamical evolution in gas-rich dwarf galaxies},
author = {Simone Recchi and Francesca Matteucci and Annibale D'Ercole},
journal= {arXiv preprint arXiv:astro-ph/0002371},
year = {2007}
}
Comments
4 pages, Latex, 2 figures, to be published in "Cosmic Evolution and Galaxy Formation: Structure, Interactions and Feedback", ASP Conference Series