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As part of the Megamaser Cosmology Project (MCP), we present VLBI maps ofnuclear water masers toward five galaxies. The masers originate in sub-parseccircumnuclear disks. For three of the galaxies, we fit Keplerian rotationcurves to estimate their supermassive black hole (SMBH) masses, and determine(2.9 $\pm$ 0.3) $\times~10^{6}M_\odot$ for J0437+2456, (1.7 $\pm$ 0.1)$\times~10^{7}M_\odot$ for ESO 558$-$G009, and (1.1 $\pm$ 0.2)$\times~10^{7}M_\odot$ for NGC 5495. In the other two galaxies, Mrk 1029 andNGC 1320, the geometry and dynamics are more complicated and preclude robustblack hole mass estimates. Including our new results, we compiled a list of 15VLBI-confirmed disk maser galaxies with robust SMBH mass measurements. Withthis sample, we confirm the empirical relation of $R_{out} \propto 0.3M_{SMBH}$ reported in Wardle & Yusef-Zadeh (2012). We also find a tentativecorrelation between maser disk outer radii and WISE luminosity. We find nocorrelations of maser disk size with X-ray 2-10 keV luminosity or [O III]luminosity.

The Megamaser Cosmology Project.IX. Black hole masses for three maser galaxies