Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..402..127s&link_type=abstract
Approaching Micro-Arcsecond Resolution with VSOP-2: Astrophysics and Technologies ASP Conference Series, Vol. 402, proceedings o
Astronomy and Astrophysics
Astrophysics
Scientific paper
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 H_2O 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.
Inoue Makoto
Kameno Seiji
Nakamura Kazuo
Namikawa Daichi
Sawada-Satoh Satoko
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