Abstract
Total intensity and polarization maps at wavelengths of 6 and 20 cm are presented for 47 double radio sources with one-sided jets. There is a strong asymmetry in the degree of depolarization between λ6 and 20 cm : of the 37 sources with significant depolarization, 34 show less depolarization on the jet side than on the counter-jet side. There is also a significant asymmetry in the spectral index of the two sides : the jet-side spectral index is flatter by typically Δα = 0.1. By comparison, the asymmetries in flux density, peak brightness and separation from the nucleus are minor, and cannot be significant contributors to the depolarization asymmetry
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