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DLA Systems: their Star Formation History and their Age

Published online by Cambridge University Press:  23 December 2005

Francesco Calura ,
Miroslava Dessauges-Zavadsky  and
Francesca Matteucci
Francesco Calura
Affiliation:
Dipartimento di Astronomia, Universitá degli studi di Trieste, via G. B. Tiepolo 11-13, 34131 Trieste email: fcalura@ts.astro.it
Miroslava Dessauges-Zavadsky
Affiliation:
Observatoire de Genève, CH-1290 Sauverny, Switzerland
Francesca Matteucci
Affiliation:
Dipartimento di Astronomia, Universitá degli studi di Trieste, via G. B. Tiepolo 11-13, 34131 Trieste email: fcalura@ts.astro.it
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Abstract

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By means of chemical evolution models for galaxies of different morphological types (i.e. spirals and irregular/starburst galaxies) we study the nature of Damped Lyman-alpha (DLA) systems. By focusing on individual systems, we can derive important constraints on both their star formation history and their age. Our results indicate that the local conterparts of most DLAs are represented by dwarf galaxies having had low star formation rates, but some systems can also be associated to spirals. Some systems are already old, with ages of ∼1 Gyr, and some others are experiencing the very first star formation episodes.

Keywords

Galaxies: abundancesgalaxies: evolutiongalaxies: high-redshiftquasars: absorption lines
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Symposium S228: From Lithium to Uranium: Elemental Tracers of Early Cosmic Evolution , May 2005 , pp. 581 - 586
Copyright
© 2005 International Astronomical Union