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We study the optical properties of the host galaxies of nuclear 22 GHz(lambda=1.35 cm) water masers. To do so, we cross-match the galaxy samplesurveyed for water maser emission (123 detections and 3806 non-detections) withthe SDSS low-redshift galaxy sample (z<0.05). Out of 1636 galaxies with SDSSphotometry, we identify 48 detections; out of the 1063 galaxies that also haveSDSS spectroscopy, we identify 33 detections. We find that maser detection rateis higher at higher optical luminosity (M_B), larger velocity dispersion($\sigma$), and higher [OIII]5007 luminosity, with [OIII]5007 being thedominant factor. These detection rates are essentially the result of thecorrelations of isotropic maser luminosity with all three of these variables.These correlations are natural if maser strength increases with central blackhole mass and the level of AGN activity. We also find that the detection rateis higher in galaxies with higher extinction. Based on these results, wepropose that maser surveys seeking to efficiently find masers should rank AGNtargets by extinction-corrected [OIII]5007 flux when available. Thisprioritization would improve maser detection efficiency, from an overall ~ 3%without pre-selection to ~ 16% for the strongest intrinsic [OIII]5007 emitters,by a factor of ~ 5.

Optical Properties of Host Galaxies of Extragalactic Nuclear Water Masers