Journal
ASTROPHYSICAL JOURNAL
Volume 588, Issue 1, Pages L17-L20Publisher
IOP PUBLISHING LTD
DOI: 10.1086/375391
Keywords
galaxies : abundances; galaxies : bulges; galaxies : fundamental parameters
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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 sigma with small scatter. This dependence is similar to that recently found by Cenarro for elliptical galaxies, implying a 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 initial mass function variations in the onset of the observed relations.
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