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Date and Time of the Query: 2019-06-25 T05:14:02 PDT
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For refcode 2008ApJ...680..191S:
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Copyright by American Astronomical Society. Reproduced by permission
2008ApJ...680..191S Positional Coincidence of H_2_O Maser and a Plasma-Obscuring Torus in Radio Galaxy NGC 1052 Sawada-Satoh, Satoko; Kameno, Seiji; Nakamura, Kayoko; Namikawa, Daichi; Shibata, Katsunori M.; Inoue, Makoto Abstract. We present multifrequency simultaneous VLBA observations at 15, 22, and 43 GHz toward 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 H_2_O maser emission in the velocity range of 1550-1850 km s^-1^, which is redshifted by 50-350 km s^-1^ 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 H I seen in absorption. The H_2_O maser gas is located where the free-free absorption opacity is large. This 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 could be the source of accretion onto the central engine. Key words: Galaxies: Active, Galaxies: Individual: NGC Number: NGC 1052, Galaxies: Nuclei, Galaxies: Seyfert, Masers
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