Powerful extragalactic masers

Details Powerful extragalactic masers Powerful extragalactic masers

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.315...26b&link_type=abstract

Nature (ISSN 0028-0836), vol. 315, May 2, 1985, p. 26-31.

Physics

122

Background Radiation, Emission Spectra, Extragalactic Radio Sources, Hydroxyl Emission, Interstellar Masers, Water Masers, Brightness Temperature, Flux (Rate), Hyperfine Structure, Luminosity, Molecular Clouds, Optical Pumping, Radial Velocity, Red Shift

Scientific paper

Two strong extragalactic OH masers have been detected in the galaxies NGC 3690 and Mrk 231 which are in the same class as the megamaser source IC 4553 (Arp 220). The amplification model for the background continuum proposed for IC 4553 can account for most of the powerful OH maser lines and for part of the H2O emission. Most masing galaxies have sufficient infrared flux to pump the masing regions, except that the H2O pumping occur at a much higher conversion efficiency than the OH pumping.

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