Evidence for superluminal motion on kiloparsec scales in 3C 120

Details Evidence for superluminal motion on kiloparsec scales in 3C 120 Evidence for superluminal motion on kiloparsec scales in 3C 120

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...335..668w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 335, Dec. 15, 1988, p. 668-676.

Astronomy and Astrophysics

Astronomy

33

Extragalactic Radio Sources, Galactic Structure, Radio Jets (Astronomy), Very Large Array (Vla), Very Long Base Interferometry, Angular Velocity, Flow Velocity

Scientific paper

The radio jet in 3C 120 has a knot located 4" or 2h-1 kiloparsecs, from the core. A shift in position of the knot away from the core by 9 ± 3 mas in 3.75 yr has been detected with the VLA. The implied angular velocity is 2.4 ± 0.8 mas yr-1, giving an apparent linear velocity of 3.7 ± 1.2h-1 times the speed of light for z = 0.033 and HO = lOOh km s-1 M-1. This superluminal velocity is similar to that seen on parsec scales in the same source with VLBI. No direct method has been found to measure the velocity of the material in a radio jet. There are indirect but convincing arguments that the low-power, two-sided jets must be nonrelativistic on kiloparsec scales. For the high-power, one-sided jets, VLBI observations of superluminal motions in the inner parsecs of many are usually considered to be convincing evidence that they are relativistic on small scales. The large-scale onesidedness, the continuity of jet structures, and depolarization asymmetries suggest that the relativistic motion continues to kiloparsec scales but the evidence is poor. The results presented here, assuming they stand the test of future observations, considerably strengthen the argument for relativistic motion on kiloparsec scales.

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