Sigma-drop in galaxies and the sigma-metallicity degeneracy

Details Sigma-drop in galaxies and the sigma-metallicity degeneracy Sigma-drop in galaxies and the sigma-metallicity degeneracy

2008-09-30

arxiv.org/abs/0809.5138v1

Astronomy and Astrophysics

Astrophysics

(1) Observatoire de Lyon, France (2) University of Sofia, Bulgaria (3) Ghent University, Belgium 4 pages, 3 figures. Proceedin

Scientific paper

10.1002/asna.200811066

In some galaxies, the central velocity dispersion, sigma, is depressed with respect to the surroundings. This sigma-drop phenomenon may have different physical origins, bearing information about the internal dynamics of the host galaxy. In this article, we stress the importance also of observational artifacts due to the sigma-metallicity degeneracy: when a spectrum of a population is compared with a template of miss-matched metallicity, the velocity dispersion may be wrongly estimated. A sigma-drop may appear in place of a metallicity peak. The discussion is illustrated using VLT/FORS spectra of diffuse elliptical galaxies. Some of the sigma-drop galaxies reported in the literature may be analysis artifacts.

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