Astronomy and Astrophysics – Astronomy
Scientific paper
May 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26as...36..173h&link_type=abstract
Astronomy and Astrophysics Supplement Series, vol. 36, May 1979, p. 173-192. Research supported by the Statens Naturvetenskapli
Astronomy and Astrophysics
Astronomy
61
Galactic Structure, Radio Astronomy, Radio Galaxies, Data Reduction, Depolarization, Faraday Effect, Galactic Rotation, Intergalactic Media, Interstellar Magnetic Fields, Magnetic Field Configurations, Polarization (Waves)
Scientific paper
Results are presented for 4995-MHz observations of the radio galaxies 3C 111, 192, 219, 223, 315, and 452, all of which have unusually bright and well-defined tails and bridges. Contour maps of the total intensity and the linearly polarized intensity are provided for the six sources. The total intensity distributions are examined, along with the spectral-index distribution over the sources, the structure of the projected magnetic fields, and Faraday rotation and depolarization. It is found that: (1) the six sources exhibit the normal linear double structure to varying degrees; (2) the double-arc configuration of 3C 315 is an extreme case of rotational symmetric distortion and is also present in 3C 192 and, to a lesser extent, in 3C 452; (3) the spectrum steepens along the tail in typical radio lobes; (4) equipartition magnetic-field strengths in the extended emission regions range from 4 to 8 microgauss; and (5) there is an almost perfect relation between the projected magnetic field and the total brightness distribution, which can be understood in terms of an irregular magnetic field.
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