Local temporal intensity variations in the spectrum of the radio source Cassiopeia A

Details Local temporal intensity variations in the spectrum of the radio source Cassiopeia A Local temporal intensity variations in the spectrum of the radio source Cassiopeia A

Jul 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977pazh....3..302b&link_type=abstract

Pis'ma v Astronomicheskii Zhurnal, vol. 3, July 1977, p. 302-305. In Russian.

Astronomy and Astrophysics

Astronomy

3

Cassiopeia A, Microwave Spectra, Radiant Flux Density, Radio Sources (Astronomy), Microwave Emission, Plasma Radiation, Spectral Energy Distribution, Synchrotron Radiation

Scientific paper

Results are analyzed for six years of measurements of the absolute spectral energy distribution of the radio source Cas A in the frequency range between 3 and 4 GHz. It is found that the intensity increased with time in the period from 1969 to 1973 and then fell to the level of the undisturbed spectrum in the next two years. The maximum flux increase is determined to have been 14% at a wavelength of 8 cm. This effect is explained in terms of radio emission from a large rapidly moving condensation in the shell. However, it is shown that plasma mechanisms of radio emission are more efficient from the standpoint of energy considerations.

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