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

Journal
Date Issued
2019
Author(s)
Masini, A.
•
•
Hickox, R. C.
•
Koss, M.
•
Civano, F.
•
Brigthman, M.
•
Brusa, M.
•
DOI
Abstract
Active galactic nuclei (AGNs) hosting disk water megamasers are well known to be obscured by large amounts of gas, likely due to the presence along the line of sight of an almost edge-on disky structure orbiting the supermassive black hole. Correcting for the high obscuration is crucial to infer parameters intrinsic to the source, like its luminosity. We present a broadband X-ray spectral analysis of a water megamaser AGN in an early merger (NGC 5765B), combining Chandra and NuSTAR data. NGC 5765B is highly Compton-thick and reflection-dominated, following the general trend among disk megamasers. Combining the exquisite black hole mass from masers with our X-ray spectroscopy, the Eddington ratio of the megamaser is estimated to be in the 2%-14% range, and its robustness is confirmed through SED fitting.
Volume
882
Issue
2
Start page
83
Uri
Url
Issn Identifier
0004-637X
Ads BibCode
2019ApJ...882...83M
Rights
open.access
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