Water Maser Disk and a Supermassive Black Hole at the Nucleus of the Active Galaxy NGC 7738

Abstract

We present the results of very long baseline interferometry (VLBI) observations of water vapor masers in the nucleus of the LINER galaxy NGC 7738. The red- and blue-shifted and newly detected systemic maser features show an almost edge-on disk located at a distance of ${0.031}\mbox{-}{0.222}$ pc from the galactic center and rotating with a velocity of $324\mbox{-}454$ km s${}^{-1}$ . The velocity field of the disk indicates sub-Keplerian rotation, suggesting a non-negligible disk mass. The Mestel disk model reveals the central and disk masses to be $(1.2\pm 0.4)\times 10^6$ $M_{\odot }$ and $(4.7\pm 1.5)\times 10^6$ $M_{\odot }$, respectively. The mean volume density within the inner radius of the disk [$(1.2\pm 0.5)\times 10^{10}$ $M_{\odot }$ $\mathrm{p}{\mathrm{c}}^{-3}$] strongly suggests the existence of a supermassive black hole at the center.

arXiv comment11 pages, 8 figures

References in corpus (27)

• The Megamaser Cosmology Project. XIII. Combined Hubble constant constraints
• A Warped Accretion Disk and Wide Angle Outflow in the Inner Parsec of the Circinus Galaxy
• Toward a New Geometric Distance to the Active Galaxy NGC 4258. III. Final Results and the Hubble Constant
• The Megamaser Cosmology Project. III. Accurate Masses of Seven Supermassive Black Holes in Active Galaxies with Circumnuclear Megamaser Disks
• VLBI Imaging of Water Maser Emission from the Nuclear Torus of NGC 1068
• CALIFA: a diameter-selected sample for an integral field spectroscopy galaxy survey
• The Geometry of and Mass Accretion Rate through the Maser Accretion Disk in NGC 4258
• The Distribution of H2O Maser Emission in the Nucleus of NGC 4945
• A Survey for H${}_2$O Megamasers in Active Galactic Nuclei -- II. A Comparison of Detected and Undetected Galaxies
• Detection of Compact Ultraviolet Nuclear Emission in LINER Galaxies
• Non-Keplerian rotation in the nucleus of NGC 1068: evidence for a massive accretion disk?
• Evidence for a Geometrically Thick Self-Gravitating Accretion Disk in NGC 3079
• The Megamaser Cosmology Project: IV. A Direct Measurement of the Hubble Constant from UGC 3789
• Water maser emission and the parsec-scale jet in NGC 3079
• The Megamaser Cosmology Project VIII. A Geometric Distance to NGC 5765b
• The Megamaser Cosmology Project.IX. Black hole masses for three maser galaxies
• Origin of non-keplerian motions of masers in NGC 1068
• Discovery of Candidate H${}_2$O Disk Masers in AGN and Estimations of Centripetal Accelerations
• Water-Vapor Maser Disk at the Nucleus of the Seyfert 2 Galaxy IC 2560 and its Distance
• AGN disks and black holes on the weighting scales
• High Sensitivity Observations of the Water Megamasers of NGC 1068: Precise Astrometry and Detailed Kinematics
• On Estimating the Mass of Keplerian Accretion Disks in H2O Maser Galaxies
• A New Sample of Obscured AGNs Selected from the XMM-Newton and AKARI Surveys
• A new equation for the mid-plane potential of power law discs. II. Exact solutions and approximate formulae
• High-sensitivity VLBI Observations of the Water Masers in the Seyfert Galaxy NGC 1068
• A new equation for the mid-plane potential of power law disks
• Discovery of H2O Megamasers in Obscured Active Galactic Nuclei