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arxiv: astro-ph/0506498 · v1 · submitted 2005-06-21 · 🌌 astro-ph

SBS 0335-052W: The Lowest-Metallicity Star-Forming Galaxy Known

Y. I. Izotov (1) , T. X. Thuan (2) , N. G. Guseva (1) ((1) Main Astronomical Observatory , Kyiv , Ukraine , (2) Astronomy Department , University of Virginia , USA) This is my paper
classification 🌌 astro-ph
keywords galaxymeterderivedwarfknownstar-formingabundancebeen
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We present 4-meter Kitt Peak telescope and 6.5-meter MMT spectrophotometry of the extremely low-metallicity galaxy SBS 0335-052W, the western companion of the blue compact dwarf galaxy SBS 0335-052E. These observations have been combined with published 10-meter Keck data to derive for the brightest region of SBS 0335-052W an oxygen abundance 12+logO/H=7.12+/-0.03. This makes SBS 0335-052W the lowest metallicity star-forming galaxy known in the local universe. Using a Monte Carlo technique, we fit the spectral energy distribution of SBS 0335-052W to derive the age of the oldest stars contributing to its optical light. We find that star formation in SBS 0335-052W began less than 500 Myr ago, making it a likely nearby young dwarf galaxy.

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