Abstract
VLBI observations of the ground state 1665 MHz OH emission source in W3(OH) are presented, and 81 maser components stronger than 1.5 Jy have been detected. The observations have also led to the detection of five Zeeman pairs. The percent of linear, circular, and total polarization of the emission of each feature has been determined. Information is provided on the three-dimensional structure of the magnetic field. The results suggest that the OH cloud is permeated with a magnetic field, pointing away from the earth, having an average strength of 6 mG and with a SE-NW projected orientation on the plane of the sky. 29 references.
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