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The Stellar Ages of Elliptical Galaxies

Published online by Cambridge University Press:  07 August 2017

S.M. Faber
Affiliation:
UCO/Lick Observatory, UC Santa Cruz, Santa Cruz CA 95064 (faber@lick.ucsc.edu)
S.C. Trager
Affiliation:
UCO/Lick Observatory, UC Santa Cruz, Santa Cruz CA 95064 (faber@lick.ucsc.edu)
J.J. Gonzalez
Affiliation:
Instituto de Astronomia, UNAM, AP70-264, DF 04510 Mexico City, Mexico
Guy Worthey
Affiliation:
Dept. of Astronomy, Univ. of Michigan, Ann Arbor, MI 48109-1090
Corresponding
E-mail address:

Abstract

Integrated broad-band colors and metallic lines cannot discriminate clearly between the effects of age and Z in old stellar populations. Such data are more sensitive to Z than to age. The feature provides a way to break this degeneracy. New measurements indicate that the mean stellar ages of typical E galaxy nuclei are fairly young, ranging from 2 to ~12 Gyr. The outer parts of E galaxies are both older and more metal-poor than nuclei, consistent with the formation of E galaxies via mergers and starbursts. Age effects contribute strongly to the classic color-line strength sequence of E galaxies.

Type
Session 6: Stellar Populations in Elliptical Galaxies
Copyright
Copyright © Kluwer 1995 

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