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The Spectra of Radio Sources in the Revised 3c Catalogue
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1969
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The authors measured flux densities at six frequencies (38–5000 MHz) to derive the spectrum of each source. The spectra of many sources are shaped by both relativistic electron energy distributions and self‑absorption, with quasars showing a broader spread of spectral indices than radio galaxies, the strongest radio galaxies exhibiting the steepest spectra, and unidentified sources having steep spectra similar to powerful radio galaxies, suggesting they are distant galaxies. Published in The Astrophysical Journal, July 1969 (DOI 10.1086/150046).
view Abstract Citations (763) References (60) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Spectra of Radio Sources in the Revised 3c Catalogue Kellermann, K. I. ; Pauliny-Toth, I. I. K. ; Williams, P. J. S. Abstract Accurate values of the flux density are given for nearly all sources in the Revised Third Cambridge Catalogue at frequencies of 38, 178, 750, 1400, 2695, and 5000 MHz. These have been used to determine the spectrum of each source over this frequency range. It is concluded that the form of the spectra in many sources is determined not only by the energy distribution of relativistic electrons but also, as a result of self-absorption, by their spatial distribution. Sources identified with quasi-stellar objects have a wider dispersion of spectral indices than those identified with radio galaxies, particularly at the higher fre- quencies. Among the radio galaxies, the intrinsically strongest sources appear to have the steepest spectra. Unidentified sources have steep spectra similar to those of the stronger radio galaxies, and they are probably distant galaxies... Publication: The Astrophysical Journal Pub Date: July 1969 DOI: 10.1086/150046 Bibcode: 1969ApJ...157....1K full text sources ADS | data products SIMBAD (314) NED (304)