On the jet speeds of classical double radio sources

Details On the jet speeds of classical double radio sources On the jet speeds of classical double radio sources

2003-10-17

arxiv.org/abs/astro-ph/0310503v2

Mon.Not.Roy.Astron.Soc. 351 (2004) 727

Astronomy and Astrophysics

Astrophysics

7 pages, 2 figures. The revised version is accepted for publication in the MNRAS

Scientific paper

10.1111/j.1365-2966.2004.07823.x

A simple integral relation is obtained for the distribution functions of jet speeds and jet-counterjet flux asymmetries of classical double radio sources. Analytic expressions relating the mean jet speed and the mean jet flux asymmetry, and their variances are derived. The results are considered in the light of orientation-based unified schemes, and an analytical equation for the critical angle separating quasars and radio galaxies is derived. The mean jet speeds of classical double radio sources are estimated using the asymmetry of jet-counterjet flux densities taken from the 3CRR and B2 samples. For FRI radio sources the mean jet speed is ~0.54c (with a standard error SE=0.03c), while for FRII low-redshift radio galaxies and intermediate redshift quasars the values found are ~0.4c (SE=0.06c) and >0.6c respectively.

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