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Dynamical and Chemical Evolution of IZw18

Published online by Cambridge University Press:  05 March 2013

Simone Recchi
Simone Recchi*
Affiliation:
Institut für theoretische Physik und Astrophysik, Kiel University, 24098 Kiel, Germany Max-Planck Institut für Astrophysik, 85741 Garching, Germany
*
3E-mail: recchi@astrophysik.uni-kiel.de
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Abstract

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We study the effect of different star formation regimes on the dynamical and chemical evolution of IZw18, the most metal-poor dwarf galaxy locally known. To do that we adopt a two-dimensional hydrocode coupled with detailed chemical yields originating from Type II and Type Ia supernovae and from intermediate-mass stars. Particular emphasis is devoted to the problem of mixing of metals. We conclude that, under particular conditions, cooling of metals occurs with a timescale of the order of 10 Myr, thus confirming the hypothesis of instantaneous mixing adopted in chemical evolution models. We try to draw conclusions about the star formation history and the age of the last burst in IZw18.

Keywords

ISM: abundancesISM: jets and outflowsgalaxies: evolutionmethods: numerical
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 21 , Issue 2: The Fifth Workshop on Galactic Chemodynamics , 2004 , pp. 157 - 160
Copyright
Copyright © Astronomical Society of Australia 2004

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