Near-IR line-strengths in elliptical galaxies: evidence for IMF variations?

Details Near-IR line-strengths in elliptical galaxies: evidence for IMF variations? Near-IR line-strengths in elliptical galaxies: evidence for IMF variations?

2002-12-18

arxiv.org/abs/astro-ph/0212426v1

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures, LaTeX. Accepted for publication in MNRAS Pink Pages. See related information in http://www.ucm.es/info/A

Scientific paper

10.1046/j.1365-8711.2003.06360.x

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.

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