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Stellar population study in early-type galaxies: an approach from the K band

Published online by Cambridge University Press:  13 April 2010

Esther Mármol-Queraltó ,
Nicolás Cardiel ,
P. Sánchez-Blázquez ,
S. C. Trager ,
R. F. Peletier ,
H. Kuntschner ,
D. R. Silva ,
A. J. Cenarro ,
A. Vazdekis  and
J. Gorgas
Esther Mármol-Queraltó
Affiliation:
Dept. of Astrofísica, Universidad Complutense de Madrid, Ciudad Universitaria, E28040, Madrid, Spain email: emq@astrax.fis.ucm.es
Nicolás Cardiel
Affiliation:
Dept. of Astrofísica, Universidad Complutense de Madrid, Ciudad Universitaria, E28040, Madrid, Spain email: emq@astrax.fis.ucm.es
P. Sánchez-Blázquez
Affiliation:
Instituto de Astrofísica de Canarias. c/ Vía Láctea S/N, E38205, La Laguna, Tenerife, Spain
S. C. Trager
Affiliation:
Kapteyn Astronomical Institute, University of Groningen, Postbus 800, 9700 Av Groningen, the Netherlands
R. F. Peletier
Affiliation:
Kapteyn Astronomical Institute, University of Groningen, Postbus 800, 9700 Av Groningen, the Netherlands
H. Kuntschner
Affiliation:
Space Telescope – European Coordinating Facility, Karl-Schwarzschild-Str. 2, D-85748 Garching, Germany
D. R. Silva
Affiliation:
National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ, 85719USA
A. J. Cenarro
Affiliation:
Instituto de Astrofísica de Canarias. c/ Vía Láctea S/N, E38205, La Laguna, Tenerife, Spain
A. Vazdekis
Affiliation:
Instituto de Astrofísica de Canarias. c/ Vía Láctea S/N, E38205, La Laguna, Tenerife, Spain
J. Gorgas
Affiliation:
Dept. of Astrofísica, Universidad Complutense de Madrid, Ciudad Universitaria, E28040, Madrid, Spain email: emq@astrax.fis.ucm.es
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Abstract

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A full understanding of the physical properties of integrated stellar systems demands a multiwavelength approach since each spectral window shows us the contribution of different types of stars. However, most of the observational effort in stellar population studies has been focused on the optical range. Now, the new generation of instruments allow us to explore the K band, where RGB and AGB stars dominate the light of the integrated spectra. Here we present a K-band spectroscopic analysis of early-type galaxies in different environments. Our sample comprises 12 field early-type galaxies observed with ISAAC at VLT with medium resolution, and they are compared with 11 Fornax cluster galaxies previously reported by Silva et al. (2008). The clear differences found in the infrared DCO and NaI indices between field and Fornax galaxies are discussed, trying to solve the puzzle formed by the near-infrared and optical measurements.

Keywords

galaxies: clusters: general — galaxies: elliptical and lenticularcD — galaxies: evolution — galaxies: formation — galaxies: stellar content

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