Statistics
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001iaus..205..152a&link_type=abstract
Galaxies and their Constituents at the Highest Angular Resolutions, Proceedings of IAU Symposium #205, held 15-18 August 2000 at
Statistics
Scientific paper
A model is considered for the jets in classical double radio sources (FRI/FRII),in which they are intrinsically symmetric and relativistic. An integral equation is derived which allows the distribution function of jet speeds to be reconstructed by means of the distribution function of jet flux asymmetries. Analytical equations are obtained for estimating the mean jet speed and its variance. The results are considered in the light of the orientation-based unification scheme. The jet flux asymmetries of FRI/FRII radio sources from the B2/3CR samples are used to estimate their mean jet speeds on kiloparsec-scales. For low-redshift FRII radio galaxies (z<0.3) the jet speed is (0.5 ± 0.04)c, consistent with the speeds (~ 0.6c) obtained from the analysis of jet prominences, while for FRII quasars of intermediate redshift (z < 1.1) the mean jet speed is in the range from (0.7-0.8)c. For FRI radio galaxies the mean jet speed at the flaring point is (0.54 ± 0.03)c. The differences between the jet speeds on parsec/kiloparsec-scales are discussed. For the low-redshift radio galaxies, the statistics of jet flux asymmetries indicate that the narrow-line radio galaxies are oriented at larger angles to the line of sight than those with the broad-lines, the critical angle being ~ 38o.
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