| Issue |
A&A
Volume 457, Number 1, October I 2006
|
|
|---|---|---|
| Page(s) | 45 - 59 | |
| Section | Extragalactic astronomy | |
| DOI | https://doi.org/10.1051/0004-6361:20054458 | |
| Published online | 12 September 2006 | |
New southern blue compact dwarf galaxies in the 2dF Galaxy redshift survey
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
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] λ4363 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
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 ≤ 7.6 and of another seven galaxies
with 
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 ≤ 7.8.
Key words: galaxies: starburst / galaxies: abundances / galaxies: fundamental parameters / galaxies: structure
© ESO, 2006
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