Abstract
THE programme of interferometric observations of distant radio sources at present being carried out by H. P. Palmer et al. at Jodrell Bank may prove to be of great significance for cosmology. The preliminary results recently published1 indicate that out of 91 sources 38 were of sufficiently small angular diameter to produce measurable interference fringes at the long base line used (32,000 λ at λ = 1.89 m.), and at least 7 had a diameter between half-power points less than 3 sec. of arc. Furthermore, these 7 were described as having “an extremely high surface brightness which is comparable with that of the intense radio source in Cygnus I.A.U. 19 N4A”.
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DAVIDSON, W. Cosmological Significance of Angular Measurements of Distant Radio Sources. Nature 189, 991–992 (1961). https://doi.org/10.1038/189991a0
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DOI: https://doi.org/10.1038/189991a0
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