Flickering of extragalactic radio sources

Details Flickering of extragalactic radio sources Flickering of extragalactic radio sources

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aj.....89.1111h&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 89, Aug. 1984, p. 1111-1123.

Astronomy and Astrophysics

Astronomy

71

Extragalactic Radio Sources, Radio Astronomy, Calibrating, Centimeter Waves, Scintillation, Variability

Scientific paper

Variability on time scales of 2-20 days, called 'flickering' in this paper, has been studied at 9-cm wavelength. Measurements of 226 sources were made on about 25 consecutive days in each of three observing sessions. The observing list includes roughly equal numbers of steep spectrum (SC) and flat or complex spectrum (F) sources. The SC sources do not flicker while F sources do, with an average amplitude of about 1.5 percent. Observations of a smaller number of sources at 6-cm wavelength suggest that the amplitude of flickering is about the same at 6 and 9 cm. Flickering may be caused by scintillation in the interstellar or near-source medium, or it may be intrinsic to the source.

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