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Disentangling Nitrogen and Carbon Abundances in Early-Type Galaxies

Published online by Cambridge University Press:  13 April 2010

Elisa Toloba ,
Patricia Sánchez-Blázquez ,
Javier Gorgas  and
Brad K. Gibson
Elisa Toloba
Affiliation:
Universidad Complutense de Madrid, 28040, Madrid, Spain email: etj@astrax.fis.ucm.es
Patricia Sánchez-Blázquez
Affiliation:
Jeremiah Horrocks Institute, University of Central Lancashire, Preston, PR1 2HE, UK Instituto de Astrofísica de Canarias, Via Lactea S/N, 38205, La Laguna, Spain
Javier Gorgas
Affiliation:
Universidad Complutense de Madrid, 28040, Madrid, Spain email: etj@astrax.fis.ucm.es
Brad K. Gibson
Affiliation:
Jeremiah Horrocks Institute, University of Central Lancashire, Preston, PR1 2HE, UK
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Abstract

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The near-UV NH3360 feature has been measured in a sample of 35 early-typegalaxies in a wide range of masses and environments. We found that, contrary towhat is seen with Mg- and C-sensitive Lick-style indices, NH3360 does not varysignificantly with galaxy velocity dispersion. When compared with solar-scaledstellar population models N/Fe appears mildly enhanced. We do not detect anydifference in the NH3360 index between galaxies in different environments. Weoutline the important implications of these conclusions for our understanding ofthe origin of carbon and nitrogen, and the star formation histories ofearly-type galaxies.

Keywords

galaxies: abundancesgalaxies: elliptical and lenticularcDgalaxies: evolution

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