Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976aj.....81.1053d&link_type=abstract
Astronomical Journal, vol. 81, Dec. 1976, p. 1053-1068
Astronomy and Astrophysics
Astronomy
48
Extragalactic Radio Sources, Microwave Emission, Radio Astronomy, Periodic Variations, Radiant Flux Density
Scientific paper
The paper presents 7.9-GHz flux-density measurements for 63 extragalactic radio sources, most of which vary with time. The measurements were made with a 120-ft antenna and a switched 150-K parametric-amplifier radiometer employing a 20-MHz bandwidth centered at 7875 MHz. Flux-density variations of the sources are plotted against time in years for the period from 1969.0 to 1974.5, and a two-dimensional classification scheme is proposed on the basis of the time scale and amplitude of the variations. It is noted that this classification scheme is presently useful as an empirical description of a radio source's properties and that a scheme based on physical characteristics must await a more thorough theoretical understanding of variable radio sources.
Dent William A.
Kapitzky J. E.
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