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SBS 0335-052W: The Lowest-Metallicity Star-Forming Galaxy Known | | Y. I. Izotov
; T. X. Thuan
; N. G. Guseva
; | | Date: |
21 Jun 2005 | | Journal: | Astrophys.J. 632 (2005) 210-216 | | Subject: | astro-ph | | Affiliation: | Main Astronomical Observatory, Kyiv, Ukraine, Astronomy Department, University of Virginia, USA | | Abstract: | 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. | | Source: | arXiv, astro-ph/0506498 | | Services: | Forum | Review | PDF | Favorites | |
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