Abstract
Multi-Element Radio Linked Interferometer Network (MERLIN) observations of 6.668-GHz methanol and both 6.031- and 6.035-GHz hydroxyl (OH) emission from the massive star formation region ON1 are presented. These are the first methanol observations made in full polarization using five antennas of MERLIN, giving high resolution and sensitivity to extended emission. Maser features are found to lie at the southern edge of the ultracompact H II region, following the known distribution of ground-state OH masers. The masers cover a region ∼1 arcsec in extent, lying perpendicular to the H 13 CO + bipolar outflow. Excited-state OH emission demonstrates consistent polarization angles across the strongest linearly polarized features which are parallel to the overall distribution. The linear polarizations vary between 10.0 and 18.5 per cent, with an average polarization angle of −60 ◦ ± 28 ◦ . The strongest 6.668-GHz methanol features provide an upper limit to linear polarization of ∼1 per cent. Zeeman splitting of OH shows magnetic fields between −1.1 and −5.8 mG, and a tentative methanol magnetic field strength of −18 mG is measured.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
