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

Bibcode
2003MNRAS.339L..12C
DOI
10.1046/j.1365-8711.2003.06360.x
Cenarro, A. J.; Gorgas, J.; Vazdekis, A.; Cardiel, N.; Peletier, R. F.
Bibliographical reference

Monthly Notice of the Royal Astronomical Society, Volume 339, Issue 1, pp. L12-L16.

Advertised on:
2
2003
Number of authors
5
IAC number of authors
1
Citations
166
Refereed citations
149
Description
We present new relations between recently defined line-strength indices in the near-infrared (CaT*, CaT, PaT, MgI and sTiO) and central velocity dispersion (σ0) for a sample of 35 early-type galaxies, showing evidence for significant anti-correlations between CaII triplet indices (CaT* and CaT) and log σ0. 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.
Type
Refereed
Galaxies

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