Study of the brightness and polarization structure of extragalactic radio sources

Details Study of the brightness and polarization structure of extragalactic radio sources Study of the brightness and polarization structure of extragalactic radio sources

Aug 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975aj.....80..559s&link_type=abstract

Astronomical Journal, vol. 80, Aug. 1975, p. 559-580. Research supported by the Stanford University.

Astronomy and Astrophysics

Astronomy

21

Astronomical Maps, Extragalactic Radio Sources, Microwave Emission, Polarization Characteristics, Radiant Flux Density, Absorption Spectra, Galactic Nuclei, Radio Astronomy, Radio Galaxies

Scientific paper

The brightness and linear-polarization structure of 19 extended extragalactic radio sources are determined at a frequency of 10.7 GHz. Compact components with self-absorption spectra coincident with the nucleus of an associated galaxy are fairly common, while many sources display regions of high-percentage polarization, sometimes greater than 40%. Comparison of our results with other studies, all at lower frequencies (generally not exceeding 5 GHz), has yielded information on spectra, depolarization rates, and Faraday rotation of the polarization plane in various source regions. At least four distinct classes of extragalactic radio sources are identified. These classes form a sequence along which the prominence of the compact central component declines relative to that of the extended outer regions, while those outer regions become more ordered in their structure and assume specific polarization characteristics. It is suggested that this sequence is in fact an evolutionary sequence.

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