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Powerful extragalactic masers

Abstract

Two strong extragalactic OH masers have been detected in the galaxies NGC3690 and Mrk 231 which are in the same class as the megamaser source IC4553 (Arp 220). The amplification model for the background continuum proposed for IC4553 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 must occur at a much higher conversion efficiency than the OH pumping.

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Baan, W. Powerful extragalactic masers. Nature 315, 26–31 (1985). https://doi.org/10.1038/315026a0

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