Correlations between line strengths and fine structure in elliptical galaxies

Details Correlations between line strengths and fine structure in elliptical galaxies Correlations between line strengths and fine structure in elliptical galaxies

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...364l..33s&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 364, Dec. 1, 1990, p. L33-L36.

Astronomy and Astrophysics

Astrophysics

159

Elliptical Galaxies, Fine Structure, Galactic Structure, Line Spectra, Absorption Spectra, H Beta Line, Interacting Galaxies, Luminosity, Metallicity

Scientific paper

For 36 giant elliptical galaxies located mostly in the field and in groups, the strength of the nuclear H-beta absorption line at any given absolute magnitude increases systematically with the amount of fine structure while the strengths of the CN and Mg I + MgH features decrease. This effect is most likely due to systematic variations in mean age, rather than mean metallicity, of the stellar populations. The resulting correlations are used to estimate the contributions of age and metallicity variations to line-strength scatter, and it is suggested that the elusive population of intermediate-age remnants of major disk-disk mergers may be found among ellipticals with much fine structure and enhanced H-beta absorption.

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