The Stellar Ages of Elliptical Galaxies

Details The Stellar Ages of Elliptical Galaxies The Stellar Ages of Elliptical Galaxies

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999ap%26ss.267..273f&link_type=abstract

Astrophysics and Space Science, v. 267, Issue 1/4, p. 273-281 (1999).

Astronomy and Astrophysics

Astrophysics

7

Scientific paper

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.

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