Radio spectral properties of B2 quasars

Details Radio spectral properties of B2 quasars Radio spectral properties of B2 quasars

Mar 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....73...40f&link_type=abstract

Astronomy and Astrophysics, vol. 73, no. 1-2, Mar. 1979, p. 40-45.

Astronomy and Astrophysics

Astronomy

17

Quasars, Radiant Flux Density, Radio Sources (Astronomy), Radio Spectra, Astronomical Catalogs, Luminous Intensity, Microwave Spectra, Superhigh Frequencies

Scientific paper

The spectral properties of a sample of 74 quasars from the B2 catalog are discussed on the basis of flux-density measurements at 0.4, 1.4, and 5 GHz. It is shown that a large fraction of sources have a pronounced high-frequency flattening in the radio spectrum. The probability of occurrence of such a flattening is strongly related to the ratio R between radio and optical luminosity. This result is interpreted as being due to the coexistence, in radio sources associated with quasars, of a compact component (core) with a flat or inverted spectrum and an extended component with a straight normal spectrum. The ratio of the core luminosity to that of the extended component increases by a factor of at least about 5 for a decrease in R by about a factor of 30. At high frequency, for values of log R at least about 4.1 the cores contribute little to the total flux, and the overall radio spectrum of the quasars is straight. For log R less than about 3.5, on the other hand, the cores become significant near 5 GHz and produce the observed flattening in the radio spectrum.

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