Decrease of Flux Density of the Radio Source Cassiopeia A at 81.5 MHz

Details Decrease of Flux Density of the Radio Source Cassiopeia A at 81.5 MHz Decrease of Flux Density of the Radio Source Cassiopeia A at 81.5 MHz

Sep 1969

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969natur.223.1139s&link_type=abstract

Nature, Volume 223, Issue 5211, pp. 1139-1140 (1969).

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Scientific paper

THE radio source Cassiopeia A is well known to be associated with the remnants of a galactic supernova. Although optical studies are difficult because of heavy obscuration the object is seen to consist of a roughly circular nebulosity with an angular diameter of 4 min of arc. Minkowski1-3 has investigated the motions of the filaments and estimated the date of the explosion as AD 1702 +/- 14. It is natural to expect a secular variation of flux density from so young an object and, following Minkowski's work, a mean rate of decrease of (1.06 +/- 0.14) per cent per year was detected by Högbom and J. R. S.4 by means of observations in 1956 and 1960 combined with earlier observations by Ryle in 1948-9. Measurements at other frequencies have since been reported5-9 which confirm that there is a decrease but do not improve the accuracy of measurement.

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