A recurrence of the Cassiopeia A flux anomaly

Details A recurrence of the Cassiopeia A flux anomaly A recurrence of the Cassiopeia A flux anomaly

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.212p..27w&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 212, Jan. 15, 1985, p. 27P-31P.

Astronomy and Astrophysics

Astronomy

16

Cassiopeia A, Radiant Flux Density, Radio Astronomy, Supernova Remnants, Radio Emission, Radio Interferometers, Stellar Flares

Scientific paper

Erickson and Perley (1975) and Read (1977) have reported an anomalous increase in the flux density of Cas A at 38 MHz in contrast to the expected decrease of about 1 percent per year observed at higher frequencies and predicted by theory. In connection with these results, it was decided to monitor the flux ratio of Cas A to Cygnus A at 38 MHz over a further period of four years (1980-84), whilst making closure interferometric measurements in an attempt to map Cas A at this frequency. The results of the measurement of the ratio of the flux densities are presented in a table. The considered results yield a flux significantly greater than that expected from extension of the pre-1970 results to the present epoch. These findings support the claim by Erickson and Perley, and Read of a flux anomaly in Cas A, in that the obtained results indicate the occurrence of a new flare.

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