The compact core-jet region of the superluminal quasar 3C216

Details The compact core-jet region of the superluminal quasar 3C216 The compact core-jet region of the superluminal quasar 3C216

2000-08-31

arxiv.org/abs/astro-ph/0008508v1

Publ. Astron. Soc. J. 52(6), pp. 983-988 (2000)

Astronomy and Astrophysics

Astrophysics

6 pages, 3 figures, accepted for publication by PASJ

Scientific paper

Space very long baseline interferometry (VLBI) observations of the quasar 3C216 with the VLBI Space Observatory Programme (VSOP) reveal that the parsec scale structure of the source can be well described by compact jet models developed for interpreting the core region of radio-loud active galactic nuclei (AGN). The measured brightness temperature of T_(b) = 7.9*10^{11} K is comparable to the inverse Compton limit, from which we determine a lower limit of delta ~ 3.17 for the Doppler-boosting factor. The apparent transvers velocity of the superluminal component is beta_(app) = (3.0+-0.2) h^{-1} asuming a constant velocity, but deceleration of the jet material cannot be excluded from our data. A combination of the above values indicates that the viewing angle of the core-jet to the line-of-sight is less than 18.4 degrees, and the jet Lorentz-factor exceeds 3.16. The observed small size of the source is probably caused by both interaction with the interstellar medium, and a projection effect.

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