The Hamburg/SAO Survey for BCGs. I. (Ugryumov+, 2003)

Details The Hamburg/SAO Survey for BCGs. I. (Ugryumov+, 2003) The Hamburg/SAO Survey for BCGs. I. (Ugryumov+, 2003)

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002ycat..33970463u&link_type=abstract

VizieR On-line Data Catalog: J/A+A/397/463. Originally published in: 2003A&A...397..463U

Computer Science

Galaxies: Peculiar, Galaxies: Photometry, Spectroscopy, Radial Velocities

Scientific paper

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]4363Å 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 δ>=0° and bII<=-30°. 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>=100Å). 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 λ=5000Å (z~3). We provide a list with coordinates, measured radial velocities, B-magnitudes, equivalent widths EW([OIII]5007) and EW(Hβ) 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.
(2 data files).

Affiliated with

Also associated with

No associations

Rating

The Hamburg/SAO Survey for BCGs. I. (Ugryumov+, 2003) does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Hamburg/SAO Survey for BCGs. I. (Ugryumov+, 2003), we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Hamburg/SAO Survey for BCGs. I. (Ugryumov+, 2003) will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1194989