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The Chemical Enrichment Histories of SDSS Galaxies

Published online by Cambridge University Press:  05 December 2011

Jonas Johansson ,
Daniel Thomas  and
Claudia Maraston
Jonas Johansson
Affiliation:
Institute of Cosmology and Gravitation, University of Portsmouth, Dennis Sciama Building, Burnaby Road, Portsmouth, PO1 3FX, United Kingdom
Daniel Thomas
Affiliation:
Institute of Cosmology and Gravitation, University of Portsmouth, Dennis Sciama Building, Burnaby Road, Portsmouth, PO1 3FX, United Kingdom
Claudia Maraston
Affiliation:
Institute of Cosmology and Gravitation, University of Portsmouth, Dennis Sciama Building, Burnaby Road, Portsmouth, PO1 3FX, United Kingdom
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Abstract

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We derive the full chemical enrichment histories for 3800 early-type galaxies, including both star forming and passively evolving systems. For this purpose we have developed a method to simultaneously derive the element abundance ratios [C/Fe], [N/Fe], [Mg/Fe], [Ca/Fe] and [Ti/Fe] for unresolved stellar populations. The method is based on up-to-date stellar population models with varying element abundance ratios. A novelty of the models is that they are flux-calibrated, removing the dependence on the Lick/IDS system. Trends with velocity dispersion are investigated where [Mg/Fe] and [C/Fe] are found to show very similar trends, while [N/Fe] show overall lower abundances ratios. [Ca/Fe] ratios are close to solar values over the velocity dispersion range covered. Tentative, due to large scatter, result for [Ti/Fe] implies that Ti follow the trends of Ca.

Keywords

galaxies: elliptical and lenticularcD – galaxies: evolution – galaxies: abundances
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S277: Tracing the Ancestry of Galaxies (on the land of our ancestors) , December 2010 , pp. 174 - 177
Copyright
Copyright © International Astronomical Union 2011

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