Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....97..347g&link_type=abstract
Astronomy and Astrophysics, vol. 97, no. 2, Apr. 1981, p. 347-358.
Astronomy and Astrophysics
Astronomy
42
Hydroxyl Emission, Infrared Astronomy, Interstellar Masers, Optical Pumping, H Ii Regions, Line Spectra, Molecular Rotation, Nebulae, Population Inversion, Radiative Transfer
Scientific paper
Overlaps of the thermal or microturbulent profiles of far infrared lines of OH induce asymmetries in the radiative rates involving the maser levels. A straightforward extension of the escape probability treatment of radiative transfer is proposed in order to include the effects of overlap in the statistical equilibrium equations. The pumping effects of the many important overlaps are discussed in detail. Model calculations are performed for the intensities of the different OH maser lines associated with H II regions. The initial excitation is produced either by collisions or by the infrared continuum or by the Doppler shifted infrared lines of OH emitted by the other parts of the OH region (Lucas, 1980). The predicted maser intensities are in good agreement with the strong H II/OH masers observed provided the kinetic temperature is high (greater than 100 K) and the OH abundance large (about 0.0001), a not unlikely situation in these regions.
Guilloteau Stéphane
Lucas Robert
Omont Alain
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