MG and Fe absorption features in elliptical galaxies

Details MG and Fe absorption features in elliptical galaxies MG and Fe absorption features in elliptical galaxies

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...398...69w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 398, no. 1, p. 69-73.

Astronomy and Astrophysics

Astrophysics

488

Absorption Spectra, Elliptical Galaxies, Iron, Magnesium, Metallicity, Astronomical Models, Galactic Evolution, Galactic Nuclei, Star Formation, Supernovae

Scientific paper

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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