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Metallicity gradients: Mass dependency in dwarf elliptical galaxies

(2009) Astronomische Nachrichten. 330. p.960-965
Author
Organization
Abstract
The formation and evolution of galaxies is imprinted on their stellar population radial gradients. Two recent articles present conflicting results concerning the mass dependence of the metallicity gradients for early-type dwarf galaxies. On one side, Spolaor et al. (2009) show a tight positive correlation between the total metallicity [Z/H] and the mass. On the other side, in a distinct sample, we do not find any trend involving [Fe/H] (Koleva et al. 2009). In order to investigate the origin of the discrepancy, we examine various factors that may affect the determination of the gradients: namely the sky subtraction and the signal-to-noise ratio. We conclude that our detection of gradients are well above the possible analysis biases. Then, we measured the [Mg/Fe] relative abundance profile and found moderate gradients. The derived [Z/H] gradients scatter around -0.4 dex/r_e. The two samples contain the same types of objects and the reason of the disagreement is still not understood. Based on observations made with ESO telescopes at La Silla Paranal observatory under program ID076.B-0196
Keywords
galaxies: evolution, galaxies: dwarf, galaxies: structure

Citation

Please use this url to cite or link to this publication:

MLA
Koleva, Mina et al. “Metallicity Gradients: Mass Dependency in Dwarf Elliptical Galaxies.” Astronomische Nachrichten 330 (2009): 960–965. Print.
APA
Koleva, Mina, Prugniel, P., De Rijcke, S., Zeilinger, W. W., & Michielsen, D. (2009). Metallicity gradients: Mass dependency in dwarf elliptical galaxies. Astronomische Nachrichten, 330, 960–965. Presented at the Symposium on Matter Cycles of Galaxies in Clusters held at the JENAM 2008 Meeting.
Chicago author-date
Koleva, Mina, Philippe Prugniel, Sven De Rijcke, Werner W. Zeilinger, and Dolf Michielsen. 2009. “Metallicity Gradients: Mass Dependency in Dwarf Elliptical Galaxies.” Astronomische Nachrichten 330: 960–965.
Chicago author-date (all authors)
Koleva, Mina, Philippe Prugniel, Sven De Rijcke, Werner W. Zeilinger, and Dolf Michielsen. 2009. “Metallicity Gradients: Mass Dependency in Dwarf Elliptical Galaxies.” Astronomische Nachrichten 330: 960–965.
Vancouver
1.
Koleva M, Prugniel P, De Rijcke S, Zeilinger WW, Michielsen D. Metallicity gradients: Mass dependency in dwarf elliptical galaxies. Astronomische Nachrichten. Weinheim: WILEY; 2009;330:960–5.
IEEE
[1]
M. Koleva, P. Prugniel, S. De Rijcke, W. W. Zeilinger, and D. Michielsen, “Metallicity gradients: Mass dependency in dwarf elliptical galaxies,” Astronomische Nachrichten, vol. 330, pp. 960–965, 2009.
@article{954447,
  abstract     = {The formation and evolution of galaxies is imprinted on their stellar population radial gradients. Two recent articles present conflicting results concerning the mass dependence of the metallicity gradients for early-type dwarf galaxies. On one side, Spolaor et al. (2009) show a tight positive correlation between the total metallicity [Z/H] and the mass. On the other side, in a distinct sample, we do not find any trend involving [Fe/H] (Koleva et al. 2009). In order to investigate the origin of the discrepancy, we examine various factors that may affect the determination of the gradients: namely the sky subtraction and the signal-to-noise ratio. We conclude that our detection of gradients are well above the possible analysis biases. Then, we measured the [Mg/Fe] relative abundance profile and found moderate gradients. The derived [Z/H] gradients scatter around -0.4 dex/r_e. The two samples contain the same types of objects and the reason of the disagreement is still not understood.

Based on observations made with ESO telescopes at La Silla Paranal observatory under program ID076.B-0196},
  author       = {Koleva, Mina and Prugniel, Philippe and De Rijcke, Sven and Zeilinger, Werner W.  and Michielsen, Dolf},
  issn         = {0004-6337},
  journal      = {Astronomische Nachrichten},
  keywords     = {galaxies: evolution,galaxies: dwarf,galaxies: structure},
  language     = {eng},
  location     = {Vienna, AUSTRIA},
  pages        = {960--965},
  publisher    = {WILEY},
  title        = {Metallicity gradients: Mass dependency in dwarf elliptical galaxies},
  url          = {http://dx.doi.org/10.1002/asna.200911272},
  volume       = {330},
  year         = {2009},
}

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