Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-03-22
Astronomy and Astrophysics
Astrophysics
35 pages with 8 postscript figures. Accepted for publication in the Astrophysical Journal
Scientific paper
10.1086/321548
Results are presented from long term VLBI monitoring of the parsec-scale radio jet in 3C120, primarily at 5 and 1.7 GHz. Numerous superluminal features are followed, some over large fractional distances from the core. The speeds of the features are not all the same, but vary by less than a factor of 2. The superluminal features extend to core distances of over 0.2 arcseconds and the region of slowing has not been found. The 1.7 GHz images show evidence for stationary features in addition to the superluminal features. The structure of the jet in the vicinity of the most likely stationary feature is suggestive of a helical pattern seen in projection. The deprojected wavelength of the pattern is very long relative to the jet radius, unlike the situation in sources such as M87. If the 3C120 jet does contain a slowly-moving, helical structure, then theory suggests that the jet resides in a relatively cool medium, not in a relativistically hot cocoon or lobe.
Benson James M.
Hardee Philip E.
Hunter Todd Russell
Lystrup Makenzie B.
Pilbratt Goran
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