Other
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...200.4011k&link_type=abstract
American Astronomical Society, 200th AAS Meeting, #40.11; Bulletin of the American Astronomical Society, Vol. 34, p.704
Other
Scientific paper
The SDSS spectroscopic database, which will ultimately contain spectra of one million galaxies, provides an ideal resource for searches for extremely low-metallicity galaxies. Using the current version of the database we studied 135,000 galaxy spectra to calculate the oxygen abundance. We used only spectra in which the [OIII] 4363 Å line was detected. Among this vast number of galaxies, we discovered only one new extremely metal-poor galaxy: SDSS J0519+0007. It has an oxygen abundance of only 12+log(O/H) = 7.45 +/- 0.02 or 1/30 of our Sun. This makes it the sixth galaxy in the short list of very metal-poor galaxies, and the first one discovered with SDSS data. We derived abundances of O, Ne, Ar, N, S, and He for SDSS J0519+0007. Abundance ratios for α -elements for this galaxy are in good agreement with the mean values for other very metal-deficient blue compact galaxies (except for nitrogen). The broad low-contrast component in the Hα emission line indicates the presence of fast motions in this galaxy. We also detect the characteristic blue bump, a signature of Wolf-Rayet stars, in the SDSS spectrum. SDSS J0519+0007 is a new low-metallicity dwarf galaxy with a luminosity of MB ~ -18 mag (redshift 0.044). This is more than 3 mag brighter than any previously known galaxy of such low metallicity and indicates that such objects may span a total range of luminosities of more than 6 magnitudes.
Grebel Eva Katharina
Hao Lei
Kniazev Alexei Y.
Strauss Michael A.
No associations
LandOfFree
A New Extremely Low-Metallicity Galaxy Discovered in the SDSS 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 A New Extremely Low-Metallicity Galaxy Discovered in the SDSS, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A New Extremely Low-Metallicity Galaxy Discovered in the SDSS will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1718620