Discovery of H2O Megamasers in Obscured Active Galactic Nuclei

Abstract

Recently a new method to discover obscured active galactic nuclei (AGNs) by utilizing X-ray and Infrared data has been developed. We carried out a survey of H2O maser emission toward ten obscured AGNs with the Nobeyama 45-m telescope. We newly detected the maser emission with the signal-noise-ratio (SNR) of above 4 from two AGNs, NGC 1402 and NGC 7738. We also found a tentative detection with its SNR > 3 in NGC 5037. The detection rate of 20% is higher than those of previous surveys (usually several percents).

arXiv comment5 pages, 1 figures, 3 tables, accepted for publication in PASJ

References in corpus (16)

• The AKARI/IRC Mid-Infrared All-Sky Survey
• The XMM-Newton Serendipitous Survey. V. The Second XMM-Newton Serendipitous Source Catalogue
• Compton Thick AGN: the dark side of the X-ray background
• The Discovery of H2O Maser Emission in Seven AGN and at High Velocities in the Circinus Galaxy
• Mid and Far Infrared Properties of a Complete Sample of Local AGNs
• Digital Spectro-Correlator System for the Atacama Compact Array of the Atacama Large Millimeter/submillimeter Array
• Prevalence of High X-ray Obscuring Columns among AGN that Host H${}_2$O Masers
• NuSTAR observations of water megamaser AGN
• New Compton-thick AGN in the circumnuclear water maser hosts UGC3 789 and NGC 6264
• A search for extragalactic H2O maser emission towards IRAS galaxies II - Discovery of an H2O maser in the Seyfert 1 galaxy NGC 4051
• Kinematics, Substructure and Luminosity-weighted Dynamics of Six Nearby Galaxy Groups
• Discovery of Candidate H${}_2$O Disk Masers in AGN and Estimations of Centripetal Accelerations
• A search for extragalactic H2O maser emission towards IRAS galaxies - Detection of a maser from an infrared-luminous merger, NGC6240
• Water-Vapor Maser Disk at the Nucleus of the Seyfert 2 Galaxy IC 2560 and its Distance
• Searching for highly obscured AGN in the XMM-Newton serendipitous source catalog
• A New Sample of Obscured AGNs Selected from the XMM-Newton and AKARI Surveys

Cited by in corpus (3)

• ALMA Sub-arcsec-resolution 183 GHz H2O and Dense Molecular Line Observations of Nearby Ultraluminous Infrared Galaxies
• Extragalactic maser surveys
• Water Maser Disk and a Supermassive Black Hole at the Nucleus of the Active Galaxy NGC 7738