MERLIN observations of superluminal motion in the jet of 3C120

Astronomy and Astrophysics – Astronomy

Scientific paper

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Particle Motion, Radio Galaxies, Radio Jets (Astronomy), Relativistic Velocity, Very Large Array (Vla), Very Long Base Interferometry

Scientific paper

Changes in the radio structure of 3C120 are described based on observations at 1.67 GHz made with the Merlin, which can detect the arcsecond jet. In order to confirm the motion measured by Walker et al. (1988) with the VLA, Merlin measurements from 1980 and 1988 are compared. The 50-100 pc scale is used, and changes in the jet are found to be consistent with the superluminal motion observed with VLBI on the 1-10 pc scale. The 4 arcsec knot along the jet does not appear to change position, however, suggesting an upper limit to the speed of the knot which is about half that of the material of the inner jet. It is concluded that the data from the two observation sets cannot reliably describe the motion of the jet, and that at least three independent sets of complementary data are required to describe motion on kiloparsec scales.

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