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J/A+A/397/463 The Hamburg/SAO Survey for BCGs. I. (Ugryumov+, 2003)
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Beginning of ReadMe :J/A+A/397/463 The Hamburg/SAO Survey for BCGs. I. (Ugryumov+, 2003)
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The Hamburg/SAO Survey for low metallicity blue compact/HII galaxies (HSS-LM).
I. The first list of 46 strong-lined galaxies.
Ugryumov A.V., Engels D., Pustilnik S.A. Kniazev A.Y., Pramsky A.G.,
Hagen H.-J.
<Astron. Astrophys. 397, 463 (2003)>
=2003A&A...397..463U
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ADC_Keywords: Galaxies, peculiar ; Galaxies, photometry ; Spectroscopy ;
Radial velocities
Keywords: galaxies: dwarf - galaxies: abundances -
galaxies: distances and redshifts - surveys
Description:
We present the description and the first results of a new project
devoted to the search for extremely metal-deficient blue
compact/HII-galaxies (BCGs) and to the creation of a well selected
large BCG sample with strong emission lines. Such galaxies should be
suitable for reliable determination of their oxygen abundance through
the measurement of the faint [OIII]4363AA line. The goals of the
project are two-fold: a) to discover a significant number of new
extremely metal-poor galaxies (Z<=1/20Z_sun_), and b) to study the
metallicity distribution of local BCGs. Selection of candidates for
follow-up slit spectroscopy is performed on the database of objective
prism spectra of the Hamburg Quasar Survey.
The sky region is limited by delta>=0deg and b^II^<=-30deg. In
this paper we present the results of the follow-up spectroscopy
conducted with the Russian 6m telescope. The list of observed
candidates contained 52 objects, of which 46 were confirmed as
strong-lined BCGs (EW([OIII]5007>=100AA). The remaining five lower
excitation ELGs include three BCGs, and two galaxies classified as SBN
(Starburst Nucleus) and DANS (Dwarf Amorphous Nucleus Starburst). One
object is identified as a quasar with a strong Ly_alpha emission line
near lambda=5000AA (z 3). We provide a list with coordinates,
measured radial velocities, B-magnitudes, equivalent widths
EW([OIII]5007) and EW(Hbeta) and for the 46 strong-lined BCGs the
derived oxygen abundances 12+log(O/H). The abundances range between
7.42 and 8.4 (corresponding to metallicities between 1/30 and
1/3Z_sun_). The sample contains four galaxies with Z<=1/20Z_sun_,
of which three are new discoveries. This demonstrates the high
efficiency of the new project to find extremely metal-deficient
galaxies. The radial velocities of the strong-lined ELGs range between
500 and 19000km/s with a median value of 6400km/s. The typical
B-magnitudes of the galaxies presented are 17.0mag-18.0mag.