Superluminal motion in the quasar 3C 345

Details Superluminal motion in the quasar 3C 345 Superluminal motion in the quasar 3C 345

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...271..536u&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 271, Aug. 15, 1983, p. 536-550.

Astronomy and Astrophysics

Astronomy

86

Quasars, Radio Astronomy, Compton Effect, Flux Density, Relativistic Effects, Relativistic Velocity, Very Long Base Interferometry

Scientific paper

Observations of the compact radio structure of the quasar 3C 345 have been made at eight epochs between 1979 and 1981, using a very long baseline interferometer comprising five telescopes. The sequence of hybrid maps, alternating between 5.0 and 10.7 GHz, shows a bright unresolved "core" and a curved jet at each epoch. Two "knots" in the jet separate from the core at apparent transverse speeds ≡15c (H0 = 55 km s-1 Mpc-1); their proper motion is the best direct evidence to date for superluminal expansion in 3C 345. The one-sided morphology, proper motion, radio spectrum, and weak X-ray flux of 3C 345 can be explained in the relativistic-jet model with the jet aligned close to the line of sight. The jet is constrained to lie at θ ⪉ 7° to the line of sight, and to move with a bulk Lorentz factor γ ⪆ 6.

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