Spectral indices and counts of radio sources from the Zelenchukskaya survey

Details Spectral indices and counts of radio sources from the Zelenchukskaya survey Spectral indices and counts of radio sources from the Zelenchukskaya survey

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pazh....7..215g&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 7, Apr. 1981, p. 215-218.) Soviet Astronomy Letters, vol. 7, Mar.-Apr. 1981, p. 119-121

Astronomy and Astrophysics

Astronomy

2

Microwave Frequencies, Radiant Flux Density, Radio Sources (Astronomy), Spectral Energy Distribution, Spectrum Analysis, Galactic Radiation, Quasars, Radiation Absorption, Synchrotron Radiation

Scientific paper

Spectral indices for radio sources in the Zelenchukskaya survey spanning the frequency intervals 2.7-3.9, 3.9-8.7, and 8.7-14.4 GHz are derived from the 2.7 GHz Parkes survey and from RATAN 600 measurements at 3.9, 8.7, and 14.4 GHz. For sources identified as quasars, the mean spectral index is nearly zero throughout the frequency considered, and all quasars have spectra suggesting the presence of compact components with synchrotron self-absorption at frequencies greater than 2.7 GHz. The mean spectral index increases monotonically with frequency for galaxies, while weaker sources tend to have steeper spectra.

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