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Water maser emission in hard X-ray selected AGN

Published online by Cambridge University Press:  16 July 2018

Francesca Panessa ,
Paola Castangia ,
Andrea Tarchi ,
Loredana Bassani ,
Angela Malizia ,
Angela Bazzano  and
Pietro Ubertini
Francesca Panessa
Affiliation:
INAF - Istituto di Astrofisica e Planetologia Spaziali di Roma (IAPS), Via del Fosso del Cavaliere 100, 00133 Roma, Italy
Paola Castangia
Affiliation:
INAF-Osservatorio Astronomico di Cagliari (OAC-INAF), Via della Scienza 5,09047 Selargius (CA), Italy
Andrea Tarchi
Affiliation:
INAF-Osservatorio Astronomico di Cagliari (OAC-INAF), Via della Scienza 5,09047 Selargius (CA), Italy
Loredana Bassani
Affiliation:
Istituto di Astrofisica Spaziale e Fisica Cosmica (IASF-INAF), Via P. Gobetti 101, 40129 Bologna, Italy
Angela Malizia
Affiliation:
Istituto di Astrofisica Spaziale e Fisica Cosmica (IASF-INAF), Via P. Gobetti 101, 40129 Bologna, Italy
Angela Bazzano
Affiliation:
INAF - Istituto di Astrofisica e Planetologia Spaziali di Roma (IAPS), Via del Fosso del Cavaliere 100, 00133 Roma, Italy
Pietro Ubertini
Affiliation:
INAF - Istituto di Astrofisica e Planetologia Spaziali di Roma (IAPS), Via del Fosso del Cavaliere 100, 00133 Roma, Italy
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Abstract

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Water megamaser emission is powerful in tracing the inner region of active nuclei, mapping accretion disks and providing important clues on their absorption properties. From the X-ray spectra of AGN it is possible to estimate the intrinsic power of the central engine and the obscuring column density. The synergy between X-ray and water maser studies allows us to tackle the AGN inner physics from different perspectives. For a complete sample of AGN selected in the 20-40 keV energy range, we have investigated the presence of water maser emission and its connection to the X-ray emission, absorption and accretion rate. The hard X-ray selection of the sample results in a water maser detection rate much higher than those obtained from optically-selected samples.

Keywords

galaxies: activeradio lines: galaxiesX-rays: galaxies
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S336: Astrophysical Masers: Unlocking the Mysteries of the Universe , September 2017 , pp. 96 - 98
Copyright
Copyright © International Astronomical Union 2018 

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