Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.245..217g&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 245, July 15, 1990, p. 217-237. Research supported by t
Astronomy and Astrophysics
Astrophysics
142
Elliptical Galaxies, Galactic Clusters, Line Shape, Line Spectra, Star Formation, Cooling Flows (Astrophysics), H Beta Line, Iron, Magnesium, Metallicity
Scientific paper
Results and implications of a long-term project devoted to a systematic analysis of line strengths in early-type galaxies are discussed. Mg, Hg, and Fe line strengths are analyzed in a sample of elliptical, S0 and brightest cluster galaxies. Radial line strength gradients are measured for 15 galaxies where the spectra extend to approximately the half-light radius (re). Significant results of this study include evidence that line strengths within elliptical galaxies follow a different set of relations from those obeyed by the nuclei of ellipticals; that line strengths at r approximately equal to re in elliptical galaxies are slightly larger than those of metal-rich galactic globulars; and that gradients in early-type galaxies are highly variable, suggesting that they have experienced different star formation histories. Evidence that galaxies with cooling flows have identical Mg and Fe line strengths to galaxies without cooling flows is presented, implying that only a small fraction of the total luminosity of cooling flow galaxies could come from ongoing star formation with a normal stellar initial mass function.
Aragon Salamanca Alfonso
Efstathiou George
Gorgas Javier
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