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On the low detection efficiency of disk water megamasers in Seyfert 2 AGN

Published online by Cambridge University Press:  16 July 2018

Alberto Masini  and
Andrea Comastri
Alberto Masini
Affiliation:
INAF-Osservatorio Astronomico di Bologna, via Gobetti 93/3, 40129 Bologna, Italy Dipartimento di Fisica e Astronomia, Università di Bologna, via Gobetti 93/2, 40129 Bologna, Italy email: alberto.masini4@unibo.it
Andrea Comastri
Affiliation:
INAF-Osservatorio Astronomico di Bologna, via Gobetti 93/3, 40129 Bologna, Italy
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Abstract

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Disk megamasers are a unique tool to study active galactic nuclei (AGN) sub-pc environment, and precisely measure some of their fundamental parameters. While the majority of disk megamasers are hosted in heavily obscured (i.e., Seyfert 2, Sy2) AGN, the converse is not true, and disk megamasers are very rarely found even in obscured AGN. The very low detection rate of such systems in Sy2 AGN could be due to the geometry of the maser beaming, which requires a strict edge-on condition. We explore some other fundamental factors which could play a role in a volume-limited survey of disk megamasers in Sy2 galaxies, most importantly the radio luminosity.

Keywords

galaxies: activemasersgalaxies: general
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. 133 - 134
Copyright
Copyright © International Astronomical Union 2018 

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