Abstract
The observation results of the supernova remnant Cassiopeia A, obtained with the aid of two decameter radio interferometers at 20 and 25 MHz, are presented. The so obtained dependences of the visibility function modulus on the hour angle are compared with calculations based on the brightness distribution measurements of this source using the VLA at 1381 MHz. Discrepancies between the experimental data and the calculations considerably increase with the decrease in the frequency. It is suggested that interstellar medium absorption, causing a distortion in the source spectrum over the decameter range, may be responsible for changes in the Cas A brightness distribution at these frequencies as well.
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Megn, A.V., Braude, S.Y., Rashkovsky, S.L. et al. An investigation of the Cassiopeia A radio-image in the decameter range. Astrophys Space Sci 201, 79–90 (1993). https://doi.org/10.1007/BF00626976
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DOI: https://doi.org/10.1007/BF00626976