University of Manchester, NRAL, Jodrell Bank, Macclesfield, Cheshire SK11 9DL, United Kingdom; Natl. Electronics Comp. Technol. C., NSTDA, 73/1 Rama VI Road, Bangkok 10400, Thailand
Type
Article
Source Title
Monthly Notices of the Royal Astronomical Society
ISSN
00358711
Year
1999
Volume
303
Issue
4
Page
845-854
Open Access
All Open Access, Bronze
Publisher
Blackwell Publishing Ltd
DOI
10.1046/j.1365-8711.1999.02286.x
Format
PDF
Abstract
MERLIN polarization measurements of the OH 1665-MHz maser emission from the bipolar outflow source G 35.2-0.74N are presented. The masers have an elongated distribution, and a velocity gradient which is interpreted in terms of a disc surrounding the source of the outflow. The radius of the maser disc is 1.3 arcsec (2600 au at 2 kpc). Analysis of the OH maser polarization reveals four Zeeman pairs, with field strengths ranging from -2.5 to +5.3 mG. The direction of the field reverses on opposite sides of the disc. Linear polarization is found in five of the masers, and is used to infer the three-dimensional magnetic field direction at these points. The data lend support to the hydromagnetic model proposed by Uchida & Shibata.
