NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-19 T13:07:23 PDT
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For refcode 2016A&A...589A..59M:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2016A&A...589A..59M NuSTAR observations of water megamaser AGN Masini, A.; Comastri, A.; Balokovic, M.; Zaw, I.; Puccetti, S.; Ballantyne, D. R.; Bauer, F. E.; Boggs, S. E.; Brandt, W. N.; Brightman, M.; Christensen, F. E.; Craig, W. W.; Gandhi, P.; Hailey, C. J.; Harrison, F. A.; Koss, M. J.; Madejski, G.; Ricci, C.; Rivers, E.; Stern, D.; Zhang, W. W. Abstract. Aims: We study the connection between the masing disk and obscuring torus in Seyfert 2 galaxies. Methods: We present a uniform X-ray spectral analysis of the high energy properties of 14 nearby megamaser active galactic nuclei observed by NuSTAR. We use a simple analytical model to localize the maser disk and understand its connection with the torus by combining NuSTAR spectral parameters with the available physical quantities from VLBI mapping. Results: Most of the sources that we analyzed are heavily obscured, showing a column density in excess of ~10^23^ cm^-2^; in particular, 79% are Compton-thick (N_H_ > 1.5 x 10^24^ cm^-2^). When using column densities measured by NuSTAR with the assumption that the torus is the extension of the maser disk, and further assuming a reasonable density profile, we can predict the torus dimensions. They are found to be consistent with mid-IR interferometry parsec-scale observations of Circinus and NGC 1068. In this picture, the maser disk is intimately connected to the inner part of the torus. It is probably made of a large number of molecular clouds that connect the torus and the outer part of the accretion disk, giving rise to a thin disk rotating in most cases in Keplerian or sub-Keplerian motion. This toy model explains the established close connection between water megamaser emission and nuclear obscuration as a geometric effect. Key words: masers, galaxies: active, galaxies: Seyfert
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