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Charting the evolution of the ages and metallicities of massive galaxies since z = 0.7

Published online by Cambridge University Press:  17 August 2012

Anna Gallazzi ,
Eric F. Bell ,
Stefano Zibetti ,
Daniel Kelson  and
Jarle Brinchmann
Anna Gallazzi
Affiliation:
Dark Cosmology Center, University of Copenhagen, Niels Bohr Institute, Juliane Maries Vej 30, 2100 Copenhagen, Denmark
Eric F. Bell
Affiliation:
Department of Astronomy, University of Michigan, Ann Arbor, MI 48109, USA
Stefano Zibetti
Affiliation:
Dark Cosmology Center, University of Copenhagen, Niels Bohr Institute, Juliane Maries Vej 30, 2100 Copenhagen, Denmark
Daniel Kelson
Affiliation:
Observatories of the Carnegie Institution of Washington, Pasadena, CA 91101, USA
Jarle Brinchmann
Affiliation:
Leiden Observatory, Leiden University, 2300RA, Leiden, the Netherlands email: gallazzi@dark-cosmology.dk
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Abstract

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Detailed studies of the stellar populations of intermediate-redshift galaxies can shed light onto the processes responsible for the significant evolution of the massive galaxy population since z < 1. We have undertaken such a study by means of deep rest-frame optical spectroscopy with IMACS on Magellan on a sample of ~80 galaxies selected from CDFS to have stellar masses > 1010M⊙ and redshift 0.65 < z < 0.75. We analyse stellar absorption line strengths and interpret them with a Monte Carlo library of star formation histories to derive constraints on mean stellar ages, metallicities and stellar masses. We present here the first characterization of the stellar mass–metallicity and stellar mass–age relations at z~0.7 and their evolution to the present-day.

Keywords

galaxies: evolutiongalaxies: stellar contentgalaxies: high-redshift
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S284: The Spectral Energy Distribution of Galaxies , September 2011 , pp. 465 - 467
Copyright
Copyright © International Astronomical Union 2012

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