The near-IR Ca II triplet - sigma relation for bulges of spiral galaxies

Details The near-IR Ca II triplet - sigma relation for bulges of spiral galaxies The near-IR Ca II triplet - sigma relation for bulges of spiral galaxies

2003-03-21

arxiv.org/abs/astro-ph/0303487v1

Astrophys.J. 588 (2003) L17-L20

Astronomy and Astrophysics

Astrophysics

Accepted for publication in ApJ Letters

Scientific paper

10.1086/375391

We present measurements of the near-infrared Calcium II triplet (CaT, CaT*), Paschen (PaT) and Magnesium (MgI) 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 (sigma) with small scatter. This dependence is similar to that recently found by Cenarro (2002) for elliptical galaxies, implying an uniform CaT* -- sigma relation that applies to galaxies from ellipticals to intermediate-type spirals. The decrease of CaT and CaT* with sigma contrasts with the well-known increase of another alpha-element index, Mg_2, with sigma. We discuss the role of Ca underabundance ([Ca/Fe]<0) and IMF variations in the onset of the observed relations.

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