SBS 0335−052W: The Lowest Metallicity Star‐forming Galaxy Known | Zendy

Y. I. Izotov | Zendy; T. X. Thuan | Zendy; N. G. Guseva | Zendy

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SBS 0335−052W: The Lowest Metallicity Star‐forming Galaxy Known

Author(s) -

Y. I. Izotov,

T. X. Thuan,

N. G. Guseva

Publication year - 2005

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/432874

Subject(s) - physics , astrophysics , metallicity , galaxy , dwarf galaxy , astronomy , stars , star formation , irregular galaxy , interacting galaxy

We present 4-meter Kitt Peak telescope and 6.5-meter MMT spectrophotometry ofthe extremely low-metallicity galaxy SBS 0335-052W, the western companion ofthe blue compact dwarf galaxy SBS 0335-052E. These observations have beencombined with published 10-meter Keck data to derive for the brightest regionof SBS 0335-052W an oxygen abundance 12+logO/H=7.12+/-0.03. This makes SBS0335-052W the lowest metallicity star-forming galaxy known in the localuniverse. Using a Monte Carlo technique, we fit the spectral energydistribution of SBS 0335-052W to derive the age of the oldest starscontributing to its optical light. We find that star formation in SBS 0335-052Wbegan less than 500 Myr ago, making it a likely nearby young dwarf galaxy.Comment: 13 pages, 3 figures, accepted for publication in the Astrophysical Journa

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