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- W2462233143 abstract "A new analysis of the absolute radio spectrum of Cassiopeia A is presented which uses the latest absolute measurements and takes account of the frequency dependence in the secular rate of decrease. The spectrum is established to an accuracy of ≈ 2 %. Between 0.3 and 30GHz it is given by a flux density S 1GHz =2723 Jy and a spectral index α=―0.770 (epoch 1980.0). The absolute spectra of Cygnus A and Taurus A are also given. An accurate semi-absolute spectrum for Virgo A is established from direct accurate ratios to CasA and CygA yielding S 1GHz =285 Jy, α=―0.856 (valid for 0.4≤v≤ 25 GHz). This Virgo A spectrum is used as a basis for accurate relative spectra of a number of sources with simple spectra. These are proposed as secondary calibrators for the routine calibration of flux density measurements. Their spectral data are presented for the frequency range 0.4―15 GHz and are believed to have an absolute accuracy of about 5 %. Finally a comparison with other flux density scales is made and the paper concludes with some suggestions for future work." @default.
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- W2462233143 date "1977-10-01" @default.
- W2462233143 modified "2023-09-24" @default.
- W2462233143 title "Reprint of 1977AA an accurate flux density scale and a set of secondary calibrators." @default.
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