Multifrequency studies of seven 3CR radio sources - II. Results and interpretation

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Abstract
A detailed study of the double extragalactic radio sources 3C 47, 3C 79, 3C 219, 3C 234, 3C 300, 3C 382, and 3C 430 is presented. The study is based on maps at 2.7 and 15 GHz from the 5-km telescope and at 1.4 GHz from the One-Mile telescope. The observations at 1.4 and 2.7 GHz are used to obtain distributions of rotation measure and depolarization across the sources. A Monte Carlo modelling procedure is developed to interpret these data and to derive information about the thermal electron densities and magnetic field configurations within the source components. Maps of the magnetic field directions within 3C 47, 3C 79, 3C 219, 3C 300 and 3C 382 are given. The maps at 1.4, 2.7 and 15 GHz are compared with each other and with previously published maps at 5 GHz from the 5-km telescope to obtain estimates of the spectral indices of the bridges and heads within each source. Some evidence for re-acceleration of electrons in the extended bridge regions of 3C 219 and 3C 382 is found. The spectral, polarization and morphological information is consistent with a continuous-flow model for double radio sources.

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