Abstract
Using preliminary results from a large observational program targeting high red-shift radio quasars, we have increased the total number of radio jets known beyond a red shift of 1.5 from 5 to 26, thus generating one of the most uniform and complete samples of radio jets in existence. This sample enjoys relative freedom from cosmological and luminosity-evolution effects, which normally complicate statistical analyses of jets.An attempt has been made to test a type of radio-quasar model in which the appearance of a radio source is strongly influenced by its orientation relative to the line of sight, owing to Doppler boosting of the emission from relativistically moving jet material. Four "orientation indicators" are isolated, which should all be correlated with each other to some degree if the above-mentioned model is correct. It is found that only one pair of parameters shows a significant correlation, namely the jet prominence (relative to the lobes) and the jet curvature. This particular correlation finds a natural explanation in the physics of radio sources, and therefore may not be due to orientation effects.As a result of these findings, it is concluded that the present sample of high red-shift jets shows no evidence of relativistic flow speeds on kiloparsec scales.
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