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26 April 2024 |
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Article overview
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Near-IR line-strengths in elliptical galaxies: evidence for IMF variations? | | A. J. Cenarro
; J. Gorgas
; A. Vazdekis
; N. Cardiel
; R. F. Peletier
; | | Date: |
18 Dec 2002 | | Subject: | astro-ph | | Affiliation: | 1,3) and R. F. Peletier ( Universidad Complutense de Madrid, Spain, Instituto de Astrofisica de Canarias, Spain, Calar Alto Observatory, CAHA, Spain, University of Nottingham, UK | | Abstract: | We present new relations between recently defined line-strength indices in the near-IR (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 CaII 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. | | Source: | arXiv, astro-ph/0212426 | | Services: | Forum | Review | PDF | Favorites | |
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