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

Astronomy and Astrophysics – Astronomy

Scientific paper

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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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