VLBI and MERLIN observations of 3C 120 at 1.7 GHz - Superluminal motions beyond 0.05 arcsec

Details VLBI and MERLIN observations of 3C 120 at 1.7 GHz - Superluminal motions beyond 0.05 arcsec VLBI and MERLIN observations of 3C 120 at 1.7 GHz - Superluminal motions beyond 0.05 arcsec

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...334..560b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 334, Nov. 15, 1988, p. 560-572. NSF-supported research.

Astronomy and Astrophysics

Astronomy

29

Radio Galaxies, Radio Jets (Astronomy), Very Long Base Interferometry, Galactic Structure, Radio Emission, Relativistic Electron Beams, Very Large Array (Vla)

Scientific paper

The radio galaxy 3C 120 was observed at 1.7 GHz in 1982 and 1984 with VLBI arrays, and the results are reported. Significant changes in the radio structure are seen on scales out to 100 mas between two observations separated by 1.5 yr. The changes indicate the presence of superluminal motions at 50 mas and probably at 90 mas from the core. These are the largest angular scales on which superluminal motions have been observed. The continuity of the 3C 120 jet on scales of a fraction of an arcsec is established. The observations that the jet does not slow down over an order of magnitude in core distance, combined with the continuity of the physical parameters deduced from observations over many orders of magnitude in core distance, suggests that the jet remains relativistic on even larger scales. This supports the concept that the powerful, one-sided jets are relativistic on all scales and that the one-sidedness is the result of relativistic beaming.

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