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Paper: Positional Coincidence of H2O Maser and a Plasma Obscuring Torus in the Radio Galaxy NGC 1052
Volume: 402, Approaching Micro-Arcsecond Resolution with VSOP-2: Astrophysics and Technologies
Page: 127
Authors: Sawada-Satoh, S.; Kameno, S.; Nakamura, K.; Namikawa, D.; Shibata, K.M.; Inoue, M.
Abstract: We present multi-frequency simultaneous VLBA observations towards the nucleus of NGC 1052. The 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. The redshifted maser gas appears projected against both sides of the jet. The H2O maser gas are located where the free-free absorption opacity is large, which probably implies 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 scene of accreting onto the central engine.
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