期刊
ASTRONOMY & ASTROPHYSICS
卷 454, 期 1, 页码 137-141出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20065100
关键词
galaxies : fundamental parameters; galaxies : starburst; galaxies : abundances
We present spectroscopic observations with the 3.6 m ESO telescope of two emission-line galaxies, J2104-0035 and J0113+0052, selected from the Data Release 4 (DR4) of the Sloan Digital Sky Survey (SDSS). From our data we determine the oxygen abundance of these systems to be respectively 12 + log O/H = 7.26 +/- 0.03 and 7.17 +/- 0.09, making them the two most metal-deficient galaxies found thus far in the SDSS and placing them among the five most metal-deficient emission-line galaxies ever discovered. Their oxygen abundances are close to those of the two most metal-deficient emission-line galaxies known, SBS 0335-052W with 12 + log O/H = 7.12 +/- 0.03 and I Zw 18 with 12 + log O/H = 7.17 +/- 0.01.
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