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Gas Mixing, Gas Cycles and the Chemical Evolution of Dwarf Irregular Galaxies

Published online by Cambridge University Press:  26 May 2016

Gerhard Hensler ,
Joachim Köppen ,
Jan Pflamm  and
Andreas Rieschick
Gerhard Hensler
Affiliation:
Institute of Astronomy, University Observatory, Türkernschanzstr. 17, A-1080 Vienna, Austria Institute of Theoretical Physics and Astrophysics, University of Kiel, Olshausenstr. 40, D-24098 Kiel, Germany
Joachim Köppen
Affiliation:
Institute of Theoretical Physics and Astrophysics, University of Kiel, Olshausenstr. 40, D-24098 Kiel, Germany UMR 7550, Observatoire Astronomique de Strasbourg, 11 rue de l'Universit, F-67000 Strasbourg, France
Jan Pflamm
Affiliation:
Institute of Astronomy, University Observatory, Türkernschanzstr. 17, A-1080 Vienna, Austria
Andreas Rieschick
Affiliation:
Institute of Theoretical Physics and Astrophysics, University of Kiel, Olshausenstr. 40, D-24098 Kiel, Germany

Abstract

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Dwarf galaxies are ideal laboratories to study influential effects on galaxy evolution. In particular, their gas-rich variant with very active star formation, starbursting dwarf irregulars, shows chemical and structural signatures that lead unambiguously to the conclusion that they are standing in a vital contact with their surroundings. Gas infall cannot only trigger star formation but also allows for a reduction of the metal content. on the other hand, active star formation ignites numerous supernovae type II which accumulate and can produce a galactic wind. This again depletes the metals pushing them into a gas mixing cycle with different timescales, locally of about 10 Myrs, but an galactic scales of at least 1 Gyr. This paper illuminates the different processes like gas infall and outflow and their effects on the chemical evolution, the star formation, and the gas mixing in dwarf irregular galaxies.

Type
Part 2. Origin
Information
Symposium - International Astronomical Union , Volume 217: Recycling Intergalactic and Interslettar Matter , 2004 , pp. 178 - 187
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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