Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...102..287b&link_type=abstract
Astronomy and Astrophysics, vol. 102, no. 3, Oct. 1981, p. 287-292. Research supported by the Centre National de la Recherche S
Astronomy and Astrophysics
Astrophysics
31
Hydroxyl Emission, Interstellar Masers, Neutral Gases, Astronomical Models, H Ii Regions, Radial Velocity, Spectral Line Width, Zeeman Effect
Scientific paper
Observations of Gamma-doublet transitions of OH near the compact H II region W3(OH) are reported. Measurements were made of the J equals 7/2 transitions at 13.4 GHz, J equals 9/2 at 23.8 GHz, and the (2)pi(3/2) transitions and all four hyperfine components of the J equals 9/2 Gamma-doublet were detected simultaneously. The peak flux of the maser feature was determined to be 19 Jy, and the maser features of circular polarization were determined with a line profile resolution of 0.09 km/sec. The size of the OH region was not defined, while the optical thickness was calculated to be about tau equals 200. A model is developed of an OH envelope around the H II region, with OH molecules being excited into a rotational level of J equals 9/2. The driving energy is an FIR continuum from dust at 200 K. The OH masers are in the accreting layer and moving with a radial velocity of about one km/sec with respect to the OH gas.
Baudry Alain
Walmsley Charles Malcolm
Wilson Thomas L.
Winnberg Anders
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