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

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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.

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Authors and Affiliations

  1. Special Astrophysical Observatory, Russian Academy of Sciences, Nizhniĭ Arkhyz, 369167, Karachaĭ-Cherkessian Republic, Russia

    S. A. Pustilnik, A. Y. Kniazev, A. G. Pramskij & A. V. Ugryumov

  2. Hamburger Sternwarte, Gojenbergsweg 112, D-21029, Hamburg, Germany

    D. Engels & H. -J. Hagen

  3. European Southern Observatory, Karl-Schwarzschild Strasse 2, D-85748, Garching bei Muenchen, Germany

    A. Y. Kniazev

Authors
  1. S. A. Pustilnik
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  2. D. Engels
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  3. A. Y. Kniazev
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  4. A. G. Pramskij
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  5. A. V. Ugryumov
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  6. H. -J. Hagen
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Original Russian Text © S.A. Pustilnik, D. Engels, A.Y. Kniazev, A.G. Pramskij, A.V. Ugryumov, H.-J. Hagen, 2006, published in Pis’ma v Astronomicheskiĭ Zhurnal, 2006, Vol. 32, No. 4, pp. 257–265.

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Pustilnik, S.A., Engels, D., Kniazev, A.Y. et al. HS 2134+0400—a new very metal-poor galaxy, a representative of the void population?. Astron. Lett. 32, 228–235 (2006). https://doi.org/10.1134/S1063773706040025

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  • DOI: https://doi.org/10.1134/S1063773706040025

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