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The timescales of chemical enrichment in the Galaxy

Published online by Cambridge University Press:  01 October 2008

Antonio Pipino  and
Francesca Matteucci
Antonio Pipino
Affiliation:
Physics & Astronomy, University of Southern California, Los Angeles 90089-0484, USA email: [email protected]
Francesca Matteucci
Affiliation:
Dipartimento di Astronomia, Universita'di Trieste, via GB Tiepolo 11, 34100 Trieste, Italy
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Abstract

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The time-scales of chemical enrichment are fundamental to understand the evolution of abundances and abundance ratios in galaxies. In particular, the time-scales for the enrichment by SNe II and SNe Ia are crucial in interpreting the evolution of abundance ratios such as [α/Fe]. In fact, the α-elements are produced mainly by SNe II on time-scales of the order of 3 to 30 Myr, whereas the Fe is mainly produced by SNe Ia on a larger range of time-scales, going from 30 Myr to a Hubble time. This produces differences in the [α/Fe] ratios at high and low redshift and it is known as “time-delay” model. In this talk we review the most common progenitor models for SNe Ia and the derived rates together with the effect of the star formation history on the [α/Fe] versus [Fe/H] diagram in the Galaxy. From these diagrams we can derive the timescale for the formation of the inner halo (roughly 2 Gyr), the timescale for the formation of the local disk (roughly 7-8 Gyr) as well the time-scales for the formation of the whole disk. These are functions of the galactocentric distance and vary from 2-3 Gyr in the inner disk up to a Hubble time in the outer disk (inside-out formation). Finally, the timescale for the formation of the bulge is found to be no longer than 0.3 Gyr, similar to the timescale for the formation of larger spheroids such as elliptical galaxies. We show the time-delay model applied to galaxies of different morphological type, identified by different star formation histories, and how it constrains differing galaxy formation models.

Keywords

Galaxy: abundancesGalaxy: bulgeGalaxy: diskGalaxy: evolutionGalaxy: formationgalaxies: elliptical and lenticularcDgalaxies: evolutiongalaxies: formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S258: The Ages of Stars , October 2008 , pp. 39 - 50
Copyright
Copyright © International Astronomical Union 2009

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