Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...228...34w&link_type=abstract
Astrophysical Journal, Part 1, vol. 228, Feb. 15, 1979, p. 34-42.
Astronomy and Astrophysics
Astrophysics
4
Astronomical Maps, Brightness, Galactic Radiation, Microwave Emission, Polarized Electromagnetic Radiation, Radio Galaxies, Cold Plasmas, Galactic Rotation, Luminous Intensity, Plasma Density, Polarization Characteristics
Scientific paper
Aperture-synthesis maps of the polarized brightness distributions of five radio galaxies at 2.7 and 8.1 GHz are presented which were produced with an angular resolution of approximately 2.3 arcsec with a three-element interferometer. The sources observed include 3C 6.1, 3C 20, 3C 171, 3C 244.1, and 3C 401. Rotation measures for each source are derived from maps produced at frequencies of 1.4, 2.7, 5, and 8.1 GHz. It is found that: (1) the low-brightness extensions of the bright radio components in all five sources have a highly ordered magnetic field directed along the line of the extension; (2) polarizations as high as 50% are observed at 8.1 GHz; (3) differential rotation occurs in the extended components, implying cold plasma densities of the order of 0.0001 per cu cm; and (4) electrons and has unresolved structure.
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