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The near-IR Ca II triplet - sigma relation for bulges of spiral galaxies | | Jesús Falcón-Barroso
; Reynier F. Peletier
; Alexandre Vazdekis
; Marc Balcells
; | | Date: |
21 Mar 2003 | | Journal: | Astrophys.J. 588 (2003) L17-L20 | | Subject: | astro-ph | | Affiliation: | University of Nottingham), Reynier F. Peletier (University of Nottingham), Alexandre Vazdekis (IAC), Marc Balcells (IAC | | Abstract: | 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. | | Source: | arXiv, astro-ph/0303487 | | Services: | Forum | Review | PDF | Favorites | |
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