SIMBAD references

2003ApJ...588L..17F - Astrophys. J., 588, L17-L20 (2003/May-1)

The near-infrared Ca II triplet-σ relation for bulges of spiral galaxies.

FALCON-BARROSO J., PELETIER R.F., VAZDEKIS A. and BALCELLS M.

Abstract (from CDS):

We present measurements of the near-infrared Ca II triplet (CaT, CaT*), Paschen (PaT), and magnesium (Mg I) indices for a well-studied sample of 19 bulges of early to intermediate spiral galaxies. We find that both the CaT* and CaT indices decrease with central velocity dispersion σ with small scatter. This dependence is similar to that recently found by Cenarro for elliptical galaxies, implying a uniform CaT*-σ relation that applies to galaxies from ellipticals to intermediate-type spirals. The decrease of CaT and CaT* with σ contrasts with the well-known increase of another α-element index, Mg2, with σ. We discuss the role of Ca underabundance ([Ca/Fe]<0) and initial mass function variations in the onset of the observed relations.

Abstract Copyright:

Journal keyword(s): Galaxies: Abundances - Galaxies: Bulges - Galaxies: Fundamental Parameters

Simbad objects: 19

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