Evidence of Radio Luminosity Evolution of Quasi-stellar Radio Sources

THE evolution of quasi-stellar radio sources has been studied by investigating the relationship between log N and log S , 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 differentia...

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Bibliographic Details
Published in:Nature (London) 1970-01, Vol.225 (5230), p.358-359
Main Author: ARAKELIAN, M. A
Format: Article
Language:English
Subjects:
Humanities and Social Sciences
letter
multidisciplinary
Science
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Summary:THE evolution of quasi-stellar radio sources has been studied by investigating the relationship between log N and log S , 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.
ISSN:0028-0836
1476-4687
DOI:10.1038/225358a0