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

Published online by Cambridge University Press:  10 April 2015

Anna Gallazzi ,
Eric F. Bell ,
Stefano Zibetti ,
Jarle Brinchmann  and
Daniel D. Kelson
Anna Gallazzi
Affiliation:
INAF-Osservatorio Astrofisico di Arcetri, Largo Enrico Fermi 5, 50125 Firenze, Italy. email: gallazzi@arcetri.astro.it
Eric F. Bell
Affiliation:
Department of Astronomy, University of Michigan, 500 Church St., Ann Arbor, MI 48109, USA
Stefano Zibetti
Affiliation:
INAF-Osservatorio Astrofisico di Arcetri, Largo Enrico Fermi 5, 50125 Firenze, Italy. email: gallazzi@arcetri.astro.it
Jarle Brinchmann
Affiliation:
Leiden Observatory, Leiden University, 2300RA, Leiden, the Netherlands
Daniel D. Kelson
Affiliation:
Observatories of the Carnegie Institution of Washington, Pasadena, CA 91101, USA
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Abstract

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We present results on the stellar population properties of massive galaxies at z = 0.7 based on deep, medium-resolution IMACS spectra for a sample of ~ 70 galaxies in the ECDFS with M* > 1010M⊙. The age–mass and stellar metallicity–mass relations for the population as a whole have a similar shape as the local relations over the probed mass range, but offset to ages younger by ~ 4 Gyr and metallicities lower by ~ 0.13 dex. Quiescent galaxies alone have stellar ages and metallicities consistent with passive evolution onto the local quiescent galaxies relations. The evolution in metallicity is driven by star-forming galaxies. However a significant fraction of massive star-forming galaxies have metallicities comparable to those of local quiescent galaxies. If quenched at z < 0.7 they can provide the necessary population to reproduce the scatter in age and metallicity of local quiescent galaxies.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S311: Galaxy Masses as Constraints of Formation Models , July 2014 , pp. 126 - 129
Copyright
Copyright © International Astronomical Union 2015 

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