Journal
ASTROPHYSICAL JOURNAL
Volume 698, Issue 2, Pages 1981-1988Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/698/2/1981
Keywords
H II regions; ISM: individual (Onsala 1); stars: formation
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Funding
- National Science Council of Taiwan [NSC 97-2112M-001-006-MY2]
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We report subarcsecond images of the high-mass star-forming region Onsala 1 (ON 1) made with the Submillimeter Array (SMA) at 0.85 mm and the Very Large Array (VLA) at 1.3 cm and 3.6 cm. ON 1 is one of the smallest ultracompact H II regions in the Galaxy and exhibits various star formation signposts. With our VLA and SMA observations, two new centimeter-wave sources and five submillimeter dust sources, respectively, within a field of similar to 5 '' (corresponding to a linear scale of 0.05 pc) are identified, indicating the multiplicity at the center of the ON 1 region. The dust and gas masses of these submillimeter sources are in the range of 0.8 to 6.4 M-circle dot. Among the five submillimeter dust sources, SMA2, with a dust and gas mass of 2.6 M-circle dot, demonstrates several star formation signatures, and hence likely represents an intermediate-mass (or even high-mass) star-forming core. Due to the low star formation efficiency of similar to 10%, we suggest that star formation in the ON 1 region will continue. For example, SMA4 and SMA5 are not associated with any star formation signatures and likely mark star formation cores at very early evolutionary stages.
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