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Sigma-drop in galaxies and the sigma-metallicity degeneracy

(2008) ASTRONOMISCHE NACHRICHTEN. 329(9-10). p.968-971
Author
Organization
Abstract
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
Keywords
galaxies: kinematics and dynamics, galaxies: stellar content, galaxies: abundances

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Chicago
Koleva, M., P. Prugniel, and Sven De Rijcke. 2008. “Sigma-drop in Galaxies and the Sigma-metallicity Degeneracy.” Astronomische Nachrichten 329 (9-10): 968–971.
APA
Koleva, M., Prugniel, P., & De Rijcke, S. (2008). Sigma-drop in galaxies and the sigma-metallicity degeneracy. ASTRONOMISCHE NACHRICHTEN, 329(9-10), 968–971.
Vancouver
1.
Koleva M, Prugniel P, De Rijcke S. Sigma-drop in galaxies and the sigma-metallicity degeneracy. ASTRONOMISCHE NACHRICHTEN. 2008;329(9-10):968–71.
MLA
Koleva, M., P. Prugniel, and Sven De Rijcke. “Sigma-drop in Galaxies and the Sigma-metallicity Degeneracy.” ASTRONOMISCHE NACHRICHTEN 329.9-10 (2008): 968–971. Print.
@article{695169,
  abstract     = {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},
  author       = {Koleva, M. and Prugniel, P. and De Rijcke, Sven},
  issn         = {0004-6337},
  journal      = {ASTRONOMISCHE NACHRICHTEN},
  keywords     = {galaxies: kinematics and dynamics,galaxies: stellar content,galaxies: abundances},
  language     = {eng},
  number       = {9-10},
  pages        = {968--971},
  title        = {Sigma-drop in galaxies and the sigma-metallicity degeneracy},
  url          = {http://dx.doi.org/10.1002/asna.200811066},
  volume       = {329},
  year         = {2008},
}

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