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标题：Water maser and hard X-ray emission in AGN
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作者：P. Castangia ; A. Tarchi ; F. Panessa 等
期刊名称：PoS - Proceedings of Science
印刷版ISSN：1824-8039
出版年度：2011
卷号：2011
期号：Extremesky2011
出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：Studies of water megamaser radio sources provide a unique way to map accretion disks and to estimate masses of the nuclear engines in Active Galactic Nuclei (AGN). Broadband X-ray spectroscopy (0.1–100 keV) of AGN allows us to estimate the amount of intrinsic absorption and to derive intrinsic AGN luminosities. Therefore, complementary radio and X-ray observations of AGN potentially constitute an essential tool to understand the physics of these objects. Here, we present preliminary results of a survey to search for water maser emission in a complete sample of AGN selected in the hard X-ray band, between 20 and 40 keV, from INTEGRAL/IBIS observations. To date, we have discovered a new water maser in the NLSy1 IGRJ16385-2057. With this new detection, the fraction of water maser hosts in our INTEGRAL AGN sample is of 17% (11/66), much higher than typical detection rates obtained in surveys of optically-selected samples of AGN.