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Line-Strength Gradients in Early-Type Galaxies

Published online by Cambridge University Press:  04 August 2017

J. Gorgas
Affiliation:
Departamento de Astrofisica, Universidad Complutense, 28040 Madrid, Spain
G. Efstathiou
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge CB3 OHA, England

Abstract

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We have measured line-strength gradients in a sample of 15 early-type galaxies. The line-strength measures include the Mg2 index and the equivalent widths of Hβ and two iron blends at 5270Å and 5335Å. In most of the galaxies we find gradients in the metallic line-strengths. However, the gradients vary markedly from object to object and do not correlate strongly with other parameters such as total luminosity, rotation, etc. A comparison of the line-strengths in the outer parts of these galaxies with galactic globular clusters suggests relatively modest abundance gradients in early-type galaxies.

Type
Invited Reviews
Copyright
Copyright © Reidel 1987 

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