Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aj.....88.1126g&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 88, Aug. 1983, p. 1126-1132.
Astronomy and Astrophysics
Astronomy
5
Microwave Emission, Radio Sources (Astronomy), Flux Density, Quasars, Radio Galaxies, Radio Telescopes
Scientific paper
The complete sample of 66 radio sources whose declinations are greater than + 70 deg, and whose 5 GHz flux densities are greater than 0.5 Jy, is presently subjected to 31.4-GHz measurements. While about half of the sources have the flat radio spectra characteristic of objects having compact components that strongly radiate in the mid-cm wavelength range, another third of the sample indicates the presence of components as compact as 0.0001 arcsec or less, which radiate at short cm wavelengths irrespective of morphological type. The median spectral index of the entire sample, of the quasars alone, and of the galaxies alone, tends to flatten with increasing frequency for steep spectrum sources, while a steepening is associated with increasing frequency for the flat spectrum sources.
Geldzahler Barry J.
Kuhr H.
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