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Title:
Variations in the intensities and sizes of compact radio sources at 13 centimeter wavelength
Authors:
Gubbay, J.; Legg, A. J.; Robertson, D. S.; Nicolson, G. D.; Moffet, A. T.; Shaffer, D. B.
Affiliation:
AA(Department of Supply, Australian Defence Scientific Service, Salisbury, Australia), AB(Department of Supply, Australian Defence Scientific Service, Salisbury, Australia), AC(Department of Supply, Australian Defence Scientific Service, Salisbury, Australia), AD(South African Council for Scientific and Industrial Research, National Institute for Telecommunications Research, Johannesburg, Republic of South Africa), AE(Owens Valley Radio Observatory, Pasadena, Calif.), AF(Owens Valley Radio Observatory, Pasadena, Calif.)
Publication:
Astrophysical Journal, Part 1, vol. 215, July 1, 1977, p. 20-35. (ApJ Homepage)
Publication Date:
07/1977
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Decimeter Waves, Radiant Flux Density, Radio Astronomy, Radio Sources (Astronomy), Tables (Data), Quasars, Radio Interferometers, Radio Spectra, Variable Stars
DOI:
10.1086/155332
Bibliographic Code:
1977ApJ...215...20G

Abstract

Ninety-seven radio sources have been observed at a wavelength of 13 cm with interferometers having base-lines of 60 to 80 million wavelengths, either from California to Australia or from Australia to South Africa, at various times between 1969 and 1974. Of these, 63 have been detected, indicating that they have some compact structure on an angular scale of 0.001 arcsec or less. Comparisons are made between changes in the total flux densities of these sources and changes in the correlated flux densities from the interferometers. Resolution effects due to changes in structure on scales not exceeding about 0.001 arcsec are evident in many cases, although some variable components remain smaller than this. Examination of a complete sample of sources with centimeter-excess spectra shows a strong correlation between flux variations at 13 cm and the presence of compact structure.

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