Line-strength gradients in elliptical galaxies

Details Line-strength gradients in elliptical galaxies Line-strength gradients in elliptical galaxies

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.262..650d&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 262, no. 3, p. 650-680.

Astronomy and Astrophysics

Astronomy

329

Astronomical Spectroscopy, Elliptical Galaxies, Abundance, Emission Spectra, H Beta Line, Luminosity, Magnesium, Metallicity

Scientific paper

Measurements of line-strength gradients in Mg(2),(Fe), and H-beta for 13 galaxies performed with two instruments on the KPNO 4-m telescope are reported. The metal-line strengths are consistent with an average abundance gradient of -0.2 +/- 0.1, or a reduction in mean metallicity of the stellar population of 40 percent over a factor of 10 in radius. The findings of previous studies that the slope of the (Fe) vs Mg(2) relationship within ellipticals is steeper than the equivalent relation for the nuclei of ellipticals are confirmed. This is interpreted as evidence for an enrichment of Mg over Fe compared to the solar values used in the models. H-beta absorption is found to be constant or to increase with increasing radius in almost all of the observed galaxies.

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