Water megamaser emission in hard X-ray selected AGN

Abstract

Water megamaser emission at 22 GHz has proven to be a powerful tool for astrophysical studies of AGN allowing an accurate determination of the central black hole mass and of the accretion disc geometry and dynamics. However, after searches among thousands of galaxies, only ~ 200 of them have shown such spectroscopic features, most of them of uncertain classification. In addition, the physical and geometrical conditions under which maser activates are still unknown. In this work we aim at characterizing the occurrence of water maser emission in an unbiased sample of AGN, investigating the relation with the X-ray properties and the possible favorable geometry needed to detect water maser. We have searched for 22 GHz maser emission in a hard X-ray selected sample of AGN, taken from the INTEGRAL/IBIS survey above 20 keV. Of the 380 sources in the sample, only half have water maser data. We have also considered a sub-sample of 87 sources, volume limited, for which we obtained new Green Bank Telescope and Effelsberg observations (for 35 sources), detecting one new maser and increasing its radio coverage to 75%. The detection rate of water maser emission in the total sample is 15+/-3%, this fraction raises up to 19+/-5% for the complete sub-sample, especially if considering type 2 and Compton thick AGN. These results demonstrate that the hard X-ray selection may significantly enhance the maser detection efficiency over comparably large optical/infrared surveys. A possible decline of the detection fraction with increasing luminosity might suggest that an extreme luminous nuclear environment does not favour maser emission. The large fraction of CT AGN with water maser emission could be explained in terms of geometrical effects, being the maser medium the very edge-on portion of the obscuring medium.

arXiv comment21 pages, 3 figures. Accepted for publication in A&A June 2020

References in corpus (74)

• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Sky Maps, Systematic Errors, and Basic Results
• Active Galactic Nuclei: what's in a name?
• The 70 Month Swift-BAT All-Sky Hard X-Ray Survey
• The AGN Obscuring Torus -- End of the "Doughnut" Paradigm?
• The 105 month Swift-BAT all-sky hard X-ray survey
• The close environments of accreting massive black holes are shaped by radiative feedback
• A Warped Accretion Disk and Wide Angle Outflow in the Inner Parsec of the Circinus Galaxy
• Narrow Line Seyfert 1 Galaxies and the Evolution of Galaxies & Active Galaxies
• The 3rd IBIS/ISGRI soft gamma-ray survey catalog
• Swift BAT Survey of AGN
• The Megamaser Cosmology Project. III. Accurate Masses of Seven Supermassive Black Holes in Active Galaxies with Circumnuclear Megamaser Disks
• A Survey for H${}_2$O Megamasers in Active Galactic Nuclei -- II. A Comparison of Detected and Undetected Galaxies
• Fueling AGN II: Spatially Resolved Molecular Inflows and Outflows
• Evidence for a Geometrically Thick Self-Gravitating Accretion Disk in NGC 3079
• Are the black hole masses in Narrow Line Seyfert 1 galaxies actually small?
• The Megamaser Cosmology Project: I. VLBI observations of UGC 3789
• The Nature of the Nuclear H2O Masers of NGC 1068: Reverberation and Evidence for a Rotating Disk Geometry
• The radio structure of radio-quiet quasars
• The IBIS soft gamma-ray sky after 1000 INTEGRAL orbits
• Isotropic Luminosity Indicators in a Complete AGN Sample
• The fraction of Compton-thick sources in an INTEGRAL complete AGN sample
• The Discovery of H2O Maser Emission in Seven AGN and at High Velocities in the Circinus Galaxy
• Radio Continuum Morphology of Southern Seyfert Galaxies
• The Flaring H2O Megamaser and Compact Radio Source in Mrk 348
• Chasing obscuration in type-I AGN: discovery of an eclipsing clumpy wind at the outer broad-line region of NGC 3783
• Radio structures of the nuclei of nearby Seyfert galaxies and the nature of the missing diffuse emission
• Extragalactic H_2O masers and X-ray absorbing column densities
• The Physics of Water Masers observable with ALMA and SOFIA: Model Predictions for Evolved Stars
• Resolving the nuclear obscuring disk in the Compton-thick Seyfert galaxy NGC5643 with ALMA
• The Megamaser Cosmology Project. II. The Angular-Diameter Distance to UGC 3789
• New H2O masers in Seyfert and FIR bright galaxies
• The INTEGRAL/IBIS AGN catalogue I: X-ray absorption properties versus optical classification
• Prevalence of High X-ray Obscuring Columns among AGN that Host H${}_2$O Masers
• NuSTAR observations of water megamaser AGN
• Discovery of Water Maser Emission in Eight AGN with 70-m Antennas of NASA's Deep Space Network
• Sub-parsec radio cores in nearby Seyfert galaxies
• Narrow Line Seyfert 1 galaxies at hard X-rays
• The Discovery of Water Maser Emission from Eight Nearby Galaxies
• Discovery of Water Maser Emission in Five AGN and a Possible Correlation Between Water Maser and Nuclear 2-10 keV Luminosities
• New Compton-thick AGN in the circumnuclear water maser hosts UGC3 789 and NGC 6264
• Feeding and Feedback in NGC3081
• Powerful Water Masers in Active Galactic Nuclei
• A search for extragalactic H2O maser emission towards IRAS galaxies II - Discovery of an H2O maser in the Seyfert 1 galaxy NGC 4051
• A search for extragalactic H2O maser emission towards IRAS galaxies - Detection of a maser from an infrared-luminous merger, NGC6240
• Discovery of Candidate H${}_2$O Disk Masers in AGN and Estimations of Centripetal Accelerations
• Cold Molecular Gas Along the Merger Sequence in Local Luminous Infrared Galaxies
• The INTEGRAL/IBIS AGN catalogue: an update
• Towards Precision Supermassive Black Hole Masses using Megamaser Disks
• Optical Properties of Host Galaxies of Extragalactic Nuclear Water Masers
• The Megamaser Cosmology Project. VII. Investigating disk physics using spectral monitoring observations
• Magnetized Disk-Winds in NGC 3783
• New water masers in Seyfert and FIR bright galaxies. IV. Interferometric follow-ups
• Narrow-line Seyfert 1 galaxies: an amasing class of AGN
• A Search for H2O Megamasers in High-z Type-2 AGNs
• A Search for Water Maser Emission in Southern AGN and Star Forming Galaxies -- Discovery of a Maser in the Edge-on Galaxy IRASF01063-8034
• Radio properties of H2O maser host galaxies
• Discovery of a luminous water megamaser in the FRII radiogalaxy 3C403
• Detection of 183 GHz water megamaser emission towards NGC 4945
• Enhancing the H2O Megamaser Detection Rate Using Optical and Mid-infrared Photometry
• Black Holes and Neutron Stars in Nearby Galaxies: Insights from NuSTAR
• A Deep 0.3-10 keV Spectrum of the H${}_2$O Maser Galaxy IC 2560
• Water masers in Compton-thick AGN II. The high detection rate and EVN observations of IRAS 15480-0344
• A systematic observational study of radio properties of H2O megamaser Seyfert-2 galaxies
• Nuclear Water Maser Emission in Centaurus A
• Megamaser detection and nuclear obscuration in Seyfert galaxies
• Spectral characteristics of water megamaser galaxies II: ESO 103-G035, TXS 2226-184, and IC 1481
• Hard - X-rays selected Active Galactic Nuclei. I. A radio view at high-frequencies
• How to Detect Inclined Water Maser Disks (and Possibly Measure Black Hole Masses)
• AGN and Megamasers
• A search for water maser emission in nearby low-luminosity QSO host galaxies
• Radio continuum of galaxies with H${}_2$O megamaser disks: 33 GHz VLA data
• AGN feedback in action: a new powerful wind in 1SXPSJ050819.8+172149?
• High-Resolution Imaging of Water Maser Emission in the active galaxies NGC 6240 and M51
• New active galactic nuclei science cases with interferometry: An incomplete preview

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• NuSTAR Observations of 52 Compton-thick Active Galactic Nuclei Selected by the Swift/BAT All-sky Hard X-Ray Survey
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• The Mass of the Black Hole in NGC 5273 from Stellar Dynamical Modeling
• ALMA Sub-arcsec-resolution 183 GHz H2O and Dense Molecular Line Observations of Nearby Ultraluminous Infrared Galaxies
• Water megamaser and central black hole masses in a large sample of galaxies
• The viewing angle in AGN SED models, a data-driven analysis
• The FeK$\alpha$ Compton shoulder in accreting Supermassive Black Holes
• Searching Water Megamasers By Using Mid-infrared Spectroscopy (I): Possible Mid-infrared Indicators