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Issue A&A
Volume 457, Number 1, October I 2006
Page(s) 45 - 59
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20054458



A&A 457, 45-59 (2006)
DOI: 10.1051/0004-6361:20054458

New southern blue compact dwarf galaxies in the 2dF Galaxy redshift survey

P. Papaderos1, N. G. Guseva2, Y. I. Izotov2, K. G. Noeske1, 3, T. X. Thuan4 and K. J. Fricke1

1  Institut für Astrophysik, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
    e-mail: papade@astro.physik.uni-goettingen.de
2  Main Astronomical Observatory, Ukrainian National Academy of Sciences, 27 Zabolotnoho str., Kyiv 03680, Ukraine
3  University of California, 1156 High St., Santa Cruz, CA 95064, USA
4  Astronomy Department, University of Virginia, Charlottesville, VA 22903, USA

(Received 1 November 2005 / Accepted 12 May 2006)

Abstract
Aims.Aiming to find new extremely metal-deficient star-forming galaxies we extracted from the Two-Degree Field Galaxy Redshift Survey (2dFGRS) 100 K Data Release 14 emission-line galaxies with relatively strong [O III] $\lambda$4363 emission.
Methods.Spectroscopic and photometric studies of this sample and, in addition, of 7 Tololo and 2 UM galaxies were performed on the basis of observations with the ESO 3.6 m telescope.
Results.All sample galaxies qualify with respect to their photometric and spectroscopic properties as blue compact dwarf (BCD) galaxies. Additionally, they show a good overlap with a comparison sample of ~100 well-studied emission-line galaxies on the $12+\log{\rm (O/H)}$ vs. log(Ne/O), log(Ar/O) and log(Fe/O) planes. From the analysis of the 2dFGRS subsample we report the discovery of two new extremely metal-deficient BCDs with an oxygen abundance $12+\log{\rm (O/H)}$ $\leq$ 7.6 and of another seven galaxies with $12+\log{\rm (O/H)}$ $\la$ 7.8. Furthermore, we confirm previous oxygen abundance determinations for the BCDs Tol 1304-353 , Tol 2146-391 , UM 559 and UM 570 to be $12+\log{\rm (O/H)}$ $\leq$ 7.8.


Key words: galaxies: starburst -- galaxies: abundances -- galaxies: fundamental parameters -- galaxies: structure



© ESO 2006


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