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Active Galactic Nuclei (AGNs) hosting disk water megamasers are well known tobe obscured by large amounts of gas, likely due to the presence along the lineof sight of an almost edge-on disky structure orbiting the supermassive blackhole. Correcting for the high obscuration is crucial to infer parametersintrinsic to the source, like its luminosity. We present a broadband X-rayspectral analysis of a water megamaser AGN in an early merger (NGC 5765B),combining Chandra and NuSTAR data. NGC 5765B is highly Compton-thick andreflection-dominated, following the general trend among disk megamasers.Combining the exquisite black hole mass from masers with our X-rayspectroscopy, the Eddington ratio of the megamaser is estimated to be in the$2-14\%$ range, and its robustness is confirmed through SED fitting.

Measuring the Obscuring Column of a Disk Megamaser AGN in a Nearby Merger