A survey for OH masers in H2O maser galaxies with the Effelsberg and Green Bank radio telescopes.

We present a search for OH maser emission in galaxies hosting H₂O masers with the 100-m Effelsberg radio telescope and the Green Bank Telescope (GBT). This survey is aimed at investigating the apparent rarity and/or possible mutual exclusion of megamaser emission from OH and H₂O in the same galaxy. Our study establishes new and better upper limits on the OH maser luminosity. Our work duplicates the number of H₂O masers searched for OH emission. No new maser detections have been found. OH absorption, both in the 1667 and 1665 MHz transitions, is instead detected in two galaxies of the sample, IC342 and NGG5793. [ABSTRACT FROM AUTHOR]