Quasi-thermal excitation of the satellite lines of OH at 5 CM

Details Quasi-thermal excitation of the satellite lines of OH at 5 CM Quasi-thermal excitation of the satellite lines of OH at 5 CM

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.204..709g&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 204, Aug. 1983, p. 709-714.

Astronomy and Astrophysics

Astronomy

9

Hydroxyl Emission, Interstellar Masers, Interstellar Matter, Radio Astronomy, Centimeter Waves, Line Spectra, Molecular Excitation, Radio Spectra

Scientific paper

In each of four cases where the J = 5/2 state of 2pi3/2 OH is excited in the vicinity of compact H II infrared sources, the 6016-MHz satellite line is found to be in enhanced absorption. This is consistent with the prediction of Elitzur (1977). No clear correspondence is found between excited and ground-state behavior. Observations of the latter with higher angular resolution are considered necessary to determine whether there is a real discrepancy between the simple theory and observations. It is noted that the satellite line behavior in the ground state does not simply duplicate that in the J = 5/2 state. In the case of W33, the 1612-MHz line is primarily in emission, whereas for G291.3-0.7 it is in enhanced absorption. Explanations for this are proposed.

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