The excitation and physical nature of megamasers

Details The excitation and physical nature of megamasers The excitation and physical nature of megamasers

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.244...86b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 244, May 1, 1990, p. 86-92.

Astronomy and Astrophysics

Astronomy

14

Hydroxyl Emission, Interstellar Masers, Molecular Clouds, Spiral Galaxies, Water Masers, Far Infrared Radiation, Infrared Astronomy Satellite, Molecular Rotation, Radio Emission

Scientific paper

The mechanisms for creating inversion in OH megamasers are analyzed. It is shown that far-IR radiation at 53 microns in a turbulent medium with a velocity of 0.7 km/s or greater and n = 1000/cu cm, under the condition T(rad) is greater than T(kin), is most likely to be the pumping mechanism of the radio lines of the ground state of the OH molecule. Emission in the radio lines of the ground rotational state J = 1/2 2Pi1/2 of CH molecules should be observable from some IRAS galaxies. The kinematics of clouds moving from or toward an active nucleus are discussed.

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