Abstract
THE lowest radio frequency at which extensive observations of cosmic radio noise have been made is 19.7 Mc./s. (ref. 1). These showed that, by comparison with similar pencil beam observations at 85.5 Mc./s. (ref. 2), there are significant differences in the pattern of sky brightness and in the appearance of the discrete sources. At the lower frequency, for example, there is greater absorption of the radiation in galactic ionized hydrogen, while the coronal structure of some radio galaxies such as Centaurus A (NGC 5128) appears to be more extensive.
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ELLIS, G. Extra-Galactic Radio Emission at 4.8 Mc./s.. Nature 193, 258–259 (1962). https://doi.org/10.1038/193258b0
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DOI: https://doi.org/10.1038/193258b0
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