Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...407...65g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 407, no. 1, p. 65-82.
Astronomy and Astrophysics
Astronomy
359
Active Galactic Nuclei, Bl Lacertae Objects, Quasars, Radio Astronomy, Radio Galaxies, Relativistic Effects, Radio Sources (Astronomy), Relativistic Plasmas, Very Long Base Interferometry
Scientific paper
The evidence for relativistic bulk motion of the emitting plasma in the nuclei of about 100 radio sources, which include BL Lacertae objects, radio quasars, and radio galaxies, with published VBLI measurements of the core angular dimension and radio flux, is discussed. On the basis of a comparison of the predicted and observed HF X-ray flux, in the framework of the synchrotron self-Compton model, the beaming or Doppler factor for all sources is derived. The different beaming indicators agree reasonably well, supporting the simple kinetic model of ballistic motion of knots in a jet. The mean values of the bulk Lorentz factor and the angle to the line of sight derived for the superluminal sources are consistent with those found from the attempts to unify BL Lacertae objects and radio-loud quasars with Fanaroff-Riley Types I and II radio galaxies, respectively.
Celotti Annalisa
Ghisellini Gabriele
Maraschi Laura
Padovani Paolo
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