The morphologies and magnetic field structures of six 3CR double radio galaxies

Astronomy and Astrophysics – Astronomy

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Galactic Structure, Interstellar Magnetic Fields, Radio Galaxies, Astronomical Maps, Brightness Temperature, Faraday Effect

Scientific paper

Observations of the regions of low surface brightness in six 3CR double radio galaxies (3C 98, 184.1, 192, 223, 332 and 430) have been made with the Cambridge 5-km telescope. Maps of total and polarized intensity are presented, and the projected magnetic field structures have been deduced. High fractional polarization is seen in these sources, indicating that the magnetic fields are well-ordered. A qualitative model for the formation of the magnetic field structures is presented, in which pressure gradients in the extended lobes cause bulk flow of plasma and consequent large-scale shearing of the magnetic fields.

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