The Stellar Ages of Elliptical Galaxies |
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Authors: | SM Faber SC Trager JJ Gonzalez Guy Worthey |
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Institution: | (1) UCO/Lick Observatory, UC Santa Cruz, Santa Cruz, CA, 95064;(2) Instituto de Astronomia, UNAM, AP70-264 DF 04510 Mexico City, Mexico;(3) Dept. of Astronomy, Univ. of Michigan, Ann Arbor, MI, 48109-1090 |
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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 Hβ 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.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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