The detection of rotationally excited 2pi(1/2), J = 3/2 and J = 5/2 main lines of OH

Details The detection of rotationally excited 2pi(1/2), J = 3/2 and J = 5/2 main lines of OH The detection of rotationally excited 2pi(1/2), J = 3/2 and J = 5/2 main lines of OH

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...231..159w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 231, no. 1, May 1990, p. 159-164.

Astronomy and Astrophysics

Astrophysics

19

Interstellar Masers, Interstellar Matter, Line Spectra, Molecular Clouds, Vibrational Spectra, Atomic Energy Levels, Emission Spectra, Hydroxyl Emission, Infrared Spectra

Scientific paper

Measurements of the 2pi(1/2), J = 5/2, F = 3-3 emission line, the F = 2-2 absorption line, the 2pi(1/2), J = 3/2, F = 2-2 absorption line, and the F = 1-1 absorption line toward W3(OH) are reported. With these data, a relatively complete picture exists of the behavior of OH Lambda doublet transitions at excitation energies below 500 K in W3(OH). A rotational temperature of about 160 K + or - 10 K is obtained. The hyperfine ratios can be explained by overlaps of infrared rotational lines. The overall picture is one of absorption at high excitation and maser emission at low excitation. The results imply that infrared radiation controls the excitation.

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