Abstract
THE evolution of quasi-stellar radio sources has been studied by investigating the relationship between logN and logS, where N is the number of sources with flux density exceeding S (refs. 1–4), but this method does not distinguish between density evolution and luminosity evolution. A differential study of the optical and radio brightnesses of quasars may provide a method for determining the nature of their evolution. Density variation would be expressed both in the radio and optical wavelengths, while luminosity evolution may only be shown in the optical brightness.
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References
Ryle, M., and Clarke, R. W., Mon. Not. Roy. Astron. Soc., 122, 349 (1961).
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Gower, J. F. R., Mon. Not. Roy. Astron. Soc., 133, 151 (1966).
Longair, M. S., Mon. Not. Roy. Astron. Soc., 133, 421 (1966).
Arakelian, M. A., Astrophysica, 5 (in the press).
Schmidt, M., Astrophys. J., 151, 393 (1968).
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ARAKELIAN, M. Evidence of Radio Luminosity Evolution of Quasi-stellar Radio Sources. Nature 225, 358–359 (1970). https://doi.org/10.1038/225358a0
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DOI: https://doi.org/10.1038/225358a0
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