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Paper: MERLIN observations of superluminal motion in the jet of 3C120
Volume: 19, Radio Interferometry: Theory, Techniques, and Applications, IAU Colloquium 131
Page: 312
Authors: Muxlow, T. W. B.; Wilkinson, P. N.
Abstract: We present evidence for changes in the radio structure of the jet in 3C120 between December 1980 and December 1988 derived from MERLIN observations at 1.67 GHz. The changes are consistent with outward motion of 19 +/- 2 mas in the inner jet, about 0.15 arcsec from the core. This confirms the suggestion by Benson et al. (1988) that the jet does not slow down quickly just outside the core region usually imaged by VLBI. However, we find no evidence for motion at the position of the knot 4 arcsec from the nucleus as suggested by Walker et al. (1988). Our limit is 1.26 mas/yr, i.e., less than 1.8/h c, compared with Walker et al.'s measurement of 2.4 +/- 0.8 mas/yr i.e., 3.7 +/- 1.2/h c.
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