The relative importance of collisional and chemical pumping and radiative transfer effects in cosmic OH sources

Details The relative importance of collisional and chemical pumping and radiative transfer effects in cosmic OH sources The relative importance of collisional and chemical pumping and radiative transfer effects in cosmic OH sources

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...214..339p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 214, no. 1-2, April 1989, p. 339-346.

Astronomy and Astrophysics

Astrophysics

8

Hydroxyl Emission, Interstellar Masers, Radiative Transfer, Water Masers, Cosmic Dust, Electron Transitions, Energy Levels, Molecular Collisions, Photodissociation

Scientific paper

The relative importance of collisional and photochemical pumping and radiative transfer effects in cosmic OH masers was assessed. The present calculations are based on the new collisional rates given by Andresen et al. (1984) and the results by Andresen (1984) concerning the photodissociation of H2O molecules. It is found that the results obtained in the optically thin limit are different when radiative transfer effects are accounted for. In addition, the new rates favor inversion of the main lines at 1665 and 1667 MHz.

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