| Autor: |
Gasiprong, N., Cohen, R. J., Hutawarakorn, B. |
| Předmět: |
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| Zdroj: |
Monthly Notices of the Royal Astronomical Society; 10/11/2002, Vol. 336 Issue 1, p47-54, 8p |
| Abstrakt: |
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 H 2 O masers, suggesting that OH is formed by dissociation of H 2 O 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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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