Two extremely metal-poor emission-line galaxies in the Sloan Digital Sky Survey

(2) Institute for Astrophysics; (3) University of Virginia; Charlottesville; Germany; Goettingen; K. J. Fricke (2); Kyiv; N. G. Guseva (1); P. Papaderos (2); T. X. Thuan (3) ((1) Main Astronomical Observatory

arxiv: astro-ph/0604234 · v1 · pith:BMB7FSKJnew · submitted 2006-04-11 · 🌌 astro-ph

Two extremely metal-poor emission-line galaxies in the Sloan Digital Sky Survey

Y. I. Izotov (1) , P. Papaderos (2) , N. G. Guseva (1) , K. J. Fricke (2) , T. X. Thuan (3) ((1) Main Astronomical Observatory , Kyiv , Ukraine , (2) Institute for Astrophysics

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Goettingen Germany (3) University of Virginia Charlottesville USA)

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keywords galaxiesemission-linelogometal-deficientdatadigitaloxygensdss

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We present spectroscopic observations with the 3.6m 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+logO/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, SBS0335-052W with 12+logO/H = 7.12+/-0.03 and I Zw 18 with 12+logO/H = 7.17+/-0.01.

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Two extremely metal-poor emission-line galaxies in the Sloan Digital Sky Survey

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