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Near-infrared line-strengths in elliptical galaxies: evidence for initial mass function variations?

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Cenarro, A. J. and Gorgas García, Francisco Javier and Vazdekis, A. and Cardiel López, Nicolás and Peletier, R. F. (2003) Near-infrared line-strengths in elliptical galaxies: evidence for initial mass function variations? Monthly notices of the Royal Astronomical Society, 339 (1). L12-L16. ISSN 0035-8711

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Official URL: http://dx.doi.org/10.1046/j.1365-8711.2003.06360.x




Abstract

We present new relations between recently defined line-strength indices in the near-infrared (CaT*, CaT, PaT, MgI and sTiO) and central velocity dispersion (sigma(0) ) for a sample of 35 early-type galaxies, showing evidence for significant anti-correlations between Ca ii triplet indices (CaT* and CaT) and log sigma(0). These relations are interpreted in the light of our recent evolutionary synthesis model predictions, suggesting the existence of important Ca underabundances with respect to Fe and/or an increase of the dwarf to giant stars ratio along the mass sequence of elliptical galaxies.


Item Type:Article
Additional Information:

This article has been accepted for publication in Monthly notices of the Royal Astronomical Society. © 2003 RAS. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. We are indebted to the anonymous referee for very useful suggestions. This work was supported by the Spanish research project No. AYA2000-977.

Uncontrolled Keywords:Population synthesis model; Stellar populations; CAII triplet; Empirical calibration; Star-clusters; Nuclei; Features; Absorption; Parameters; Spheroids
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
ID Code:29716
Deposited On:24 Apr 2015 09:52
Last Modified:10 Dec 2018 15:05

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