Measurements of the circular polarization of radio sources at frequencies of 0.63, 1.4, 5.0 and 8.9 GHz

Details Measurements of the circular polarization of radio sources at frequencies of 0.63, 1.4, 5.0 and 8.9 GHz Measurements of the circular polarization of radio sources at frequencies of 0.63, 1.4, 5.0 and 8.9 GHz

Jun 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975aujph..28..325r&link_type=abstract

Australian Journal of Physics, vol. 28, June 1975, p. 325-351.

Physics

27

Astronomical Spectroscopy, Circular Polarization, Extragalactic Radio Sources, Microwave Emission, Frequency Ranges, Power Spectra, Quasars, Radiant Flux Density, Spectrum Analysis, Tables (Data)

Scientific paper

Circular polarization measurements were made with the Parkes 64-m telescope for 66 mainly extragalactic sources, 33 of which were studied at two or more frequencies. Circular polarization was definitely found in the eight quasi-stellar sources PKS0237-23, 0537-441, 1127-14, 1226+02 (3C273), 1253-05 (3C279), 2134+004, 2145+06 and 2345-16, as it was measured at the 4-sigma level or higher in at least two observing sessions. For all eight sources, the total power spectrum shows the effects of self-absorption. For none of the eight is there evidence of a reversal of the sense of polarization with frequency. For several of the sources the degree of circular polarization changed by a factor of at least 2 between observing sessions, while any accompanying change in total flux density did not exceed approximately 20%. Instrumental effects are discussed in some detail. Fluctuations due to system noise provide the main limitation, but uncertainties in the determination of the zero of polarization are important for strong sources.

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