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Title:
MG and Fe absorption features in elliptical galaxies
Authors:
Worthey, Guy; Faber, S. M.; Gonzalez, J. J.
Affiliation:
AA(Lick Observatory, Santa Cruz, CA), AB(Lick Observatory, Santa Cruz, CA), AC(Lick Observatory, Santa Cruz, CA)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 398, no. 1, p. 69-73. (ApJ Homepage)
Publication Date:
10/1992
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ABSORPTION SPECTRA, ELLIPTICAL GALAXIES, IRON, MAGNESIUM, METALLICITY, ASTRONOMICAL MODELS, GALACTIC EVOLUTION, GALACTIC NUCLEI, STAR FORMATION, SUPERNOVAE
DOI:
10.1086/171836
Bibliographic Code:
1992ApJ...398...69W

Abstract

Fe and Mg indices from two homogeneous collections of nuclear elliptical galaxy spectra are compared with model indices. In the average giant elliptical, the Mg/Fe ratio exceeds that of the most metal-rich stars in the solar neighborhood by about 0.2-0.3 dex, with a large spread about this mean. This result implies a variable 'enrichment effectiveness' of Type II supernovae (SNs) compared with Type Ia SNs in the evolution of ellipticals, caused perhaps by differences in star formation time scales, the initial mass function, or the amount of Fe versus Mg ejected in galactic winds.

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