Radio Sources: Angular Size from Scintillation Studies

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Science  12 Aug 1966:
Vol. 153, Issue 3737, pp. 745-746
DOI: 10.1126/science.153.3737.745


The frequency spectrum of fluctuations caused by interplanetary scintillations may give a sensitive estimate of the diameter of a radio source. Observations of 3C 138, 3C 245, 3C 267, and 3C 273 give diameters of 0.1, ≤0.04, ≤ 0.2, and ≤ 0.02 second of arc, respectively. Resolution is at least a factor of 5 higher than that obtained to date by means of either radio interferometers or lunar occulations.