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.
Referencia bibliográfica

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

Fecha de publicación:
2
2003
Número de autores
5
Número de autores del IAC
1
Número de citas
166
Número de citas referidas
149
Descripción
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.
Tipo
Con árbitro
Galaxias

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