Abstract
IN 1951, Ryle and Elsmore1 reported on a series of observations of radio sources using an interferometer at a frequency of 81.5 Mc./s. A comparison of the flux densities of about one hundred sources measured nearly every day for eighteen months revealed no long-term variations greater than 10 per cent, or for some of the more intense sources, greater than 5 per cent.
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References
Ryle, M., and Elsmore, B., Nature, 168, 555 (1951).
Minkowski, R., Paris Symposium on Radio Astronomy, 315, edit. by Bracewell, R. N. (Stanford Univ. Press, 1959).
Ryle, M., Smith, F. G., and Elsmore, B., Mon. Not. Roy. Astro. Soc., 110, 508 (1950).
Machin, K. E., Ryle, M., and Vonberg, D. D., Proc. Inst. Elect. Eng., Part 3, 99, 127 (1952).
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Whitfield, G. R., Mon. Not. Roy. Astro. Soc., 117, 680 (1957).
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HÖGBOM, J., SHAKESHAFT, J. Secular Variation of the Flux Density of the Radio Source Cassiopeia A. Nature 189, 561–562 (1961). https://doi.org/10.1038/189561a0
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DOI: https://doi.org/10.1038/189561a0
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