Observations of Cassiopeia A at 20 and 25 MHz with the URAN-1 interferometer

Details Observations of Cassiopeia A at 20 and 25 MHz with the URAN-1 interferometer Observations of Cassiopeia A at 20 and 25 MHz with the URAN-1 interferometer

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ap%26ss..81..221b&link_type=abstract

Astrophysics and Space Science, vol. 81, no. 1-2, Jan. 1982, p. 221-230.

Astronomy and Astrophysics

Astronomy

8

Astronomical Models, Cassiopeia A, Decametric Waves, Radio Astronomy, Radio Interferometers, Astronomical Maps, Bessel Functions, Brightness Distribution, Signal To Noise Ratios, Spectrum Analysis

Scientific paper

Results are given of radiointerferometric observations of Cassiopeia A, at decametric wavelengths, using 2840- and 3550-wavelength baselines. The large-scale structure model deduced from meter and decimeter waveband measurements is inconsistent with the decameter-wavelength results, but the data can be reconciled by assuming a compact detail whose angular dimensions are on the order of 4 arcsec. The contribution of that detail into the total flux is 6.8 + or - 2.4% and 3.7 + or - 1.4% at 20 and 25 MHz, respectively. A steep radiation spectrum in the 20-111 MHz range is found, with a spectral index of about 2.0.

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