Polarization of emission from astrophysical OH masers

Details Polarization of emission from astrophysical OH masers Polarization of emission from astrophysical OH masers

Dec 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975azh....52.1178v&link_type=abstract

Astronomicheskii Zhurnal, vol. 52, Nov.-Dec. 1975, p. 1178-1186. In Russian.

Other

7

Circular Polarization, Hydroxyl Emission, Interstellar Masers, H Ii Regions, Infrared Spectra, Magnetic Fields, Molecular Rotation, Zeeman Effect

Scientific paper

A mechanism is proposed which can enhance one of the Zeeman circular-polarization components of 1665-MHz emission from OH masers associated with H II regions. It is shown that in a medium with a small velocity gradient (about 0.2 km/s per AU) and a magnetic field of about 0.005 G, the OH-molecule spins will be slightly polarized as a result of polarizing pumping by the IR line wing. Other reasons for enhancement of one of the Zeeman-component modes are considered, and an argument in favor of the Zeeman interpretation is presented on the basis of observational data.

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