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 Variability and Velocity of Superluminal Sources


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We investigate the relation between the Doppler factor determined from variations in total flux at 22 and 37 GHz, and the apparent transverse velocity determined from VLBA observations at 2 cm. The data are consistent with the relativistic beaming theory for compact radio sources, in that the distribution of beta {app}-delta {var}, for 30 quasars, is roughly consistent with a Monte Carlo simulation. The intrinsic temperature appears to be ~2x10^{10} K, close to the -equipartition value- calculated by Readhead 1994. We deduce the distribution of Lorentz factors for a group of 48 sources; the values range up to about gamma=40.



Author: M. H. Cohen; M. A. Russo; D. C. Homan; K. I. Kellermann; M. L. Lister; R. C. Vermeulen; E. Ros; J. A. Zensus

Source: https://archive.org/







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