Radio source asymmetries and unified schemes

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Abstract
The angular asymmetries and relative separations of the hotspots of Fanaroff-Riley II (FRII) radio sources in a complete sample of 3CR sources have been used to study the effects of misalignment of the directions of ejection and the velocities of the hotspots. It is found that the observed distribution of asymmetry angles is consistent with unified schemes for radio galaxies and radio quasars and with the source components being ejected uniformly within an angle |$\phi_\text{max}$| of 6°-7° deg about the source axis. The separation quotients of the hotspots are also consistent with unified schemes, if the velocities of the hotspots have a broad distribution about a mean of 0.2c, with values extending at least up to 0.4c.

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