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The 6 cm and 20 cm radio continuum properties of all 85 galaxies withreported 22 GHz H2O maser emission and luminosity distance D > 0.5 Mpc arestudied. For the total of 55 targets for which both 6 cm and 20 cm measurementsexist and for the subsample of 42 sources with masers related to activegalactic nuclei (AGN), a spectral index could be determined from an assumedpower-law dependence. The mean value of the resulting spectral index is in bothcases 0.66+-0.07. Comparing radio properties of the maser galaxies with asample of Seyferts without detected H2O maser, we find that (1) the spectralindices agree within the error limits, and (2) maser host galaxies have highernuclear radio continuum luminosities, exceeding those of the comparison sampleby factors of order 5. Only considering the subsample of galaxies with masersassociated with AGN, there seems to be a trend toward rising maser luminositywith nuclear radio luminosity (both at 6 cm and 20 cm). However, whenaccounting for the Malmquist effect, the correlation weakens to a level, whichis barely significant. Overall, the study indicates that nuclear radioluminosity is a suitable indicator to guide future AGN maser searches and toenhance detection rates, which are otherwise quite low (<10%).

Radio properties of H2O maser host galaxies