Secular Variation of the Flux Density of the Radio Source Cassiopeia A

Details Secular Variation of the Flux Density of the Radio Source Cassiopeia A Secular Variation of the Flux Density of the Radio Source Cassiopeia A

May 1961

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1961natur.190..705h&link_type=abstract

Nature, Volume 190, Issue 4777, pp. 705-706 (1961).

Physics

15

Scientific paper

Högbom and Shakeshaft1 have recently presented evidence for a secular variation of the intensity of radio emission from the source Cassiopeia A. Their observations, made at a frequency of 81.5 Mc./s. over a period of 12 years, suggest that the flux density of Cassiopeia A relative to that of Cygnus A is decreasing at a rate of about 1 per cent per annum. This type of measurement may be sensitive to unknown systematic instrumental effects, and the importance of the result makes independent confirmation desirable.

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