High-frequency radio continuum observations of low-luminosity radio galaxies. I - A sample of sources with angular sizes greater than 4 arcmin

Details High-frequency radio continuum observations of low-luminosity radio galaxies. I - A sample of sources with angular sizes greater than 4 arcmin High-frequency radio continuum observations of low-luminosity radio galaxies. I - A sample of sources with angular sizes greater than 4 arcmin

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26as...94...13g&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 94, no. 1, July 1992, p. 13-35.

Astronomy and Astrophysics

Astrophysics

18

Luminosity, Radio Galaxies, Faraday Effect, High Frequencies, Interstellar Magnetic Fields, Linear Polarization, Polarized Radiation, Very Large Array (Vla)

Scientific paper

A sample of 10 low-luminosity radio galaxies with angular size greater than 4 arcmin has been observed at 10.6 GHz using a new multifeed receiver system installed in the secondary focus of the Effelsberg 100-m telescope. Sensitive maps of the total and linearly polarized radio emission make it possible to study the large-scale distribution of the synchrotron radiation and its spectral behavior which at short cm wavelengths cannot be measured with interferometers. Since Faraday rotation is almost negligible at this wavelength, the intrinsic projected large-scale magnetic field is directly mapped by these observations. Studies of the depolarization and Faraday rotation in radio galaxies are greatly improved by incorporating observations at such wavelengths. In general, the degree of polarization at 10.6 GHz is found to be higher in the outer parts (e.g. lobes) than in the inner parts of the sources, and it is significantly higher over most of the sources than what is measured at lower frequencies (1.4 GHz). The magnetic field orientation seems related to the morphologies of the sources. Except for one case, which is a relic radio galaxy, the integrated high-frequency spectra do not show any signs of steepening and hence particle aging.

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