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Astronomy Letters

, Volume 32, Issue 4, pp 228–235 | Cite as

HS 2134+0400—a new very metal-poor galaxy, a representative of the void population?

  • S. A. Pustilnik
  • D. Engels
  • A. Y. Kniazev
  • A. G. Pramskij
  • A. V. Ugryumov
  • H. -J. Hagen
Article

Abstract

We present the 6-m SAO telescope spectroscopy of HS 2134+0400, a blue compact galaxy (BCG) discovered within the framework of a dedicated Hamburg/SAO survey for low-metallicity BCGs (HSS-LM). Its very low abundance of oxygen (12 + log(O/H) = 7.44) and other heavy elements (S, N, Ne, Ar) allows this dwarf galaxy to be assigned to the group of eight lowest-metallicity BCGs among the several thousand BCGs known in the nearby Universe. The measured heavy-element abundance ratios (S/O, Ne/O, N/O, and Ar/O) are in good agreement with the typical values found for other very metal-poor BCGs. The spatial location of HS 2134+0400 is atypical of the majority of BCGs: it lies in the Pegasus void, a large region with a very low density of galaxies with normal
or higher luminosities. In addition to HS 2134+0400, we found a dozen more very metal-poor galaxies in voids. Therefore, we discuss the hypothesis that this type of objects may be representative for the population of dwarf galaxies in voids.

PACS numbers

95.75.Fg 95.85.Kr 98.52.Sw 98.52.Wz 98.54.Ep 98.54.Kt 98.58.Hf 98.62.Bj 98.65.Dx 98.65.Fz 

Key words

dwarf galaxies galaxy evolution elemental abundances galaxy interactions individual galaxies: HS 2134+0400 large-scale structure of Universe 

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Copyright information

© Pleiades Publishing, Inc. 2006

Authors and Affiliations

  • S. A. Pustilnik
    • 1
  • D. Engels
    • 2
  • A. Y. Kniazev
    • 1
    • 3
  • A. G. Pramskij
    • 1
  • A. V. Ugryumov
    • 1
  • H. -J. Hagen
    • 2
  1. 1.Special Astrophysical ObservatoryRussian Academy of SciencesNizhniĭ ArkhyzRussia
  2. 2.Hamburger SternwarteHamburgGermany
  3. 3.European Southern ObservatoryGarching bei MuenchenGermany

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