Positional Coincidence of H2O Maser and a Plasma Obscuring Torus in Radio Galaxy NGC 1052

Abstract

We present multi-frequency simultaneous VLBA observations at 15, 22 and 43 GHz towards the nucleus of the nearby radio galaxy NGC 1052. These three continuum images reveal a double-sided jet structure, whose relative intensity ratios imply that the jet axis is oriented close to the sky plane. The steeply rising spectra at 15-43 GHz at the inner edges of the jets strongly suggest that synchrotron emission is absorbed by foreground thermal plasma. We detected H2O maser emission in the velocity range of 1550-1850 km/s, which is redshifted by 50-350 km/s with respect to the systemic velocity of NGC 1052. The redshifted maser gas appears projected against both sides of the jet, in the same manner as the HI seen in absorption. The H2O maser gas are located where the free-free absorption opacity is large. This probably imply that the masers in NGC 1052 are associated with a circumnuclear torus or disk as in the nucleus of NGC 4258. Such circumnuclear structure can be the sence of accreting onto the central engine.

arXiv comment18 pages, 7 figures, accepted for publication in ApJ

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Cited by in corpus (26)

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• Asymmetric jet production in the Active Galactic Nucleus of NGC1052
• The Two-sided Jet Structures of NGC 1052 at Scales from 300 to $4\times 10^7$ Schwarzschild Radii
• Narrow-line Seyfert 1 galaxies: an amasing class of AGN
• A Massive Molecular Torus inside a Gas-Poor Cirnumnuclear Disk in the Radio Galaxy NGC 1052 Discovered with ALMA
• Ambilateral collimation study of the twin-jets in NGC1052
• The parsec-scale HI outflows in powerful radio galaxies
• High-frequency excess in the radio continuum spectrum of the type-1 Seyfert galaxy NGC 985
• Properties of the Obscuring Torus in NGC 1052 from Multi-epoch Broadband X-ray Spectroscopy
• 22 GHz Water Maser Search in 37 Nearby Galaxies - Four New Water Megamasers in Seyfert 2 and OH Maser/Absorber Galaxies
• Spatially Resolved HCN Absorption Features in the Circumnuclear Region of NGC 1052
• Water vapour at high redshift: Arecibo monitoring of the megamaser in MG J0414+0534
• The putative center in NGC 1052
• A broad HCO+ absorption line associated with the circumnuclear torus of NGC 1052
• VLBI observations of the H2O gigamaser in TXS2226-184
• Probing Jet-Torus Interaction in the Radio Galaxy NGC 1052 by Sulfur-Bearing Molecules
• AGN and Megamasers
• What Kinds of Accretion Disks Are There in the Nuclei of Radio Galaxies?
• Water masers in Compton-thick AGN I. Detailed study of the new water megamaser in IRAS15480-0344
• Multifrequency Very Long Baseline Interferometry Imaging of the Subparsec-scale Jet in the Sombrero Galaxy (M104)
• ALMA Detection of 321 GHz water maser emission in the radio galaxy NGC 1052
• Searching For the 380 GHz H2O emission from the High-z lensed QSO MG J0414+0534
• Powering the Jets in NGC1052
• H_2O maser and a plasma obscuring torus in the radio galaxy NGC 1052
• Very Long Baseline Interferometry imaging of H2O maser emission in the nearby radio galaxy NGC 4261
• Millimeter VLBI constraints on the central magnetic field and symmetric jet production in the twin-jet galaxy NGC 1052