Journal
ASTRONOMISCHE NACHRICHTEN
Volume 329, Issue 9-10, Pages 968-971Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asna.200811066
Keywords
galaxies: abundances; galaxies: kinematics and dynamics; galaxies: stellar content
Categories
Ask authors/readers for more resources
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. (C) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available