Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981aj.....86..848w&link_type=abstract
Astronomical Journal, vol. 86, June 1981, p. 848-853. Research supported by the National Research Council of Canada and NSF.
Astronomy and Astrophysics
Astronomy
10
Extragalactic Radio Sources, Interferometry, Microwave Emission, Radio Astronomy, Astronomical Catalogs, Radiant Flux Density, Radio Interferometers, Variability
Scientific paper
The results of two programs to monitor the λ11.1-cm flux densities of extragalactic radio sources are compared. The programs were carried out between 1972 and 1974 on the NRAO 300-ft telescope and the NRAO three-element interferometer. The two sets of data are generally in excellent agreement. Fifteen sources show the presence of extended structure in the vicinity of the compact variable component, indicated both by the interferometer visibility functions and by systematic excesses of the pencil-beam flux densities over those measured by the interferometer. The composite flux density data show that four sources exhibit significant variability on time scales of less than 50 days. At this wavelength, such rapid fluctuations imply apparent brightness temperatures in the range 1014 - 1016 K.
Bridle Alan H.
Kesteven J. L. M.
Wardle John F. C.
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