Precise Measurement of the Flux Densities of the Radio Sources Cas A and Cyg A at Metre Wavelengths
Open Access
- 1 February 1968
- journal article
- research article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 138 (4) , 407-422
- https://doi.org/10.1093/mnras/138.4.407
Abstract
The flux densities of Cas A and Cyg A have been measured at 38.0, 81.5 and 152.0 MHz with estimated errors of less than 4 per cent, a substantial improvement in accuracy over previous determinations in this frequency range. Results are also presented for Tau A at 81.5 and 152.0 MHz. A comparison with flux densities measured at higher frequencies shows that Cas A has a constant spectral index of 0.770 ± 0.006 between 38.0 MHz and 15.5 GHz.Keywords
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