Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-02-28
Astronomy and Astrophysics
Astrophysics
18 pages, 7 figures, accepted for publication in ApJ
Scientific paper
10.1086/587886
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.
Inoue Makoto
Kameno Seiji
Nakamura Kayoko
Namikawa Daichi
Sawada-Satoh Satoko
No associations
LandOfFree
Positional Coincidence of H2O Maser and a Plasma Obscuring Torus in Radio Galaxy NGC 1052 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Positional Coincidence of H2O Maser and a Plasma Obscuring Torus in Radio Galaxy NGC 1052, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Positional Coincidence of H2O Maser and a Plasma Obscuring Torus in Radio Galaxy NGC 1052 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-471553