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OH masers and magnetic fields near the cometary HII region G34.3+0.2
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Document Title
OH masers and magnetic fields near the cometary HII region G34.3+0.2
Author
Gasiprong N, Cohen RJ, Hutawarakorn B
Name from Authors Collection
Affiliations
University of Manchester; Jodrell Bank Centre for Astrophysics; Khon Kaen University; National Science & Technology Development Agency - Thailand; National Electronics & Computer Technology Center (NECTEC)
Type
Article
Source Title
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN
0035-8711
Year
2002
Volume
336
Issue
1
Page
47-54
Open Access
Bronze
Publisher
BLACKWELL PUBLISHING LTD
DOI
10.1046/j.1365-8711.2002.05703.x
Format
Abstract
MERLIN maps of OH 1665- and 1667-MHz masers in the source G34.3+0.2 are presented. The majority of the OH masers lie in a parabolic arc along the eastern edge of the cometary H II region G34.3+0.2C, possibly tracing a bow shock. The OH masers lie systematically closer to the cometary H II region than the H2O masers, suggesting that OH is formed by dissociation of H2O in the shock. The remaining OH masers cluster around the ultracompact H II region G34.3+0.2B. Zeeman splitting indicates a magnetic field strength of typically -5 mG (directed towards us). A complex magnetic field structure is inferred from the maser polarization. Linear polarization is detected in half of the masers, at levels up to 85 per cent. The linear polarization vectors suggest that the magnetic field in some regions near the cometary H II region is perpendicular to the curved edge of the bow shock.
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WOS