OH megamasers explained

Details OH megamasers explained OH megamasers explained

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...229..431h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 229, no. 2, March 1990, p. 431-440.

Astronomy and Astrophysics

Astronomy

56

Active Galactic Nuclei, Hydroxyl Emission, Interstellar Masers, Star Formation, Water Masers, Flux Density, Infrared Astronomy Satellite, Line Spectra, Optical Thickness

Scientific paper

The nature of the physical process underlying extragalactic OH megamaser emission is investigated. It is found that low-gain amplification of the radio continuum is certainly occurring in front of the nucleus of IC4553 and probably also in two other sources. It is also found that the 18 cm main-line excitation temperature do not differ by more than a factor of about two within a single source, and the main-line optical depths are close to the LTE ratio.

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