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Published online by Cambridge University Press: 14 August 2015
We have compared measurements of several hundred 3C and 4C radio sources at large redshifts to investigate how radio-source structure changes over a factor of 5–10 in luminosity. Our results show that for z ≳ 0.6:
(i) most sources (both 3C and 4C) have hotspots about 3.5 kpc in size (Ho = 50 km s−1 Mpc−1, Ω = 1);
(ii) lower-luminosity sources (bottom of 4C) have less-extended outer lobes.