Rotationally excited OH - Emission and absorption toward H II/OH regions

Details Rotationally excited OH - Emission and absorption toward H II/OH regions Rotationally excited OH - Emission and absorption toward H II/OH regions

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...131...45g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 131, no. 1, Feb. 1984, p. 45-57.

Astronomy and Astrophysics

Astronomy

40

Astronomical Spectroscopy, Hydroxyl Emission, Interstellar Gas, Interstellar Masers, Absorption Spectra, Continuous Spectra, H Ii Regions, Line Spectra, Molecular Excitation, Molecular Rotation, Radio Sources (Astronomy)

Scientific paper

The authors present observations of the 2Π3/2, J = 7/2 and 2Π3/2, J = 5/2 lines of OH toward a selection of compact galactic H II regions. Absorption has been detected toward four sources in the J = 7/2 lines at 13.4 GHz and toward seven sources in the J = 5/2 at 6.0 GHz. Four new maser sources are reported in the 6035 MHz F = 3→3 line. From these absorption line data, the authors derive typical rotation temperatures of 100K for the 2Π3/2 ladder. They also specify the differences between OH maser and absorption sources and attempt to answer three critical questions: (1) the location of the masers, (2) the location of the absorbing gas, and (3) what are the physical conditions in this gas.

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