NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-18 T01:45:12 PDT
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For refcode 2011ApJ...742...73Z:
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2011ApJ...742...73Z Optical Properties of Host Galaxies of Extragalactic Nuclear Water Masers Zhu, Guangtun; Zaw, Ingyin; Blanton, Michael R.; Greenhill, Lincoln J. Abstract. 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 sample surveyed for water maser emission (123 detections and 3806 non-detections) with the Sloan Digital Sky Survey (SDSS) low-redshift galaxy sample (z < 0.05). Out of 1636 galaxies with SDSS photometry, we identify 48 detections; out of the 1063 galaxies that also have SDSS spectroscopy, we identify 33 detections. We find that maser detection rate is higher at higher optical luminosity (M_B_), larger velocity dispersion (sigma), and higher [O III] lambda5007 luminosity, with [O III] lambda5007 being the dominant factor. These detection rates are essentially the result of the correlations of isotropic maser luminosity with all three of these variables. These correlations are natural if maser strength increases with central black hole mass and the level of active galactic nucleus (AGN) activity. We also find that the detection rate is higher in galaxies with higher extinction. Based on these results, we propose that maser surveys seeking to efficiently find masers should rank AGN targets by extinction-corrected [O III] lambda5007 flux when available. This prioritization would improve maser detection efficiency, from an overall ~3% without pre-selection to ~16% for the strongest intrinsic [O III] lambda5007 emitters, by a factor of ~5. Key words: galaxies: active, galaxies: nuclei, galaxies: Seyfert, masers, radio lines: galaxies
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