Abstract
RECENTLY, Slish1 and Williams2 have shown that the curvature at the low-frequency part of the spectrum of radio sources of high surface brightness could be interpreted as being due to synchrotron self-absorption, and that frequency of maximum flux could be used to compute the angular diameter for an assumed magnetic field. The predicted angular diameters, for a field of 10−4 gauss, are in reasonable agreement with observations, except for sources such as CTA 21, CTA 102 (ref. 3), 3C 273B (ref. 4) and Parkes 1934–63 (ref. 5), for which the predicted values are well below the limits of present-day observational techniques. The latter comment also applies to the components of the sources 3C 84 and 3C 279 if their spectra are assumed to be due to synchrotron radiation.
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MENON, T. Structure of Quasi-stellar Radio Sources. Nature 206, 810–811 (1965). https://doi.org/10.1038/206810a0
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DOI: https://doi.org/10.1038/206810a0
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