Abstract
OBSERVATIONS on the angular dimensions of the variable radio source 3C 273B by Palmer et al.1 using effective baselines of up to 2 million wavelengths have reduced the upper limit on its angular size to 0.025 sec of arc at a wavelength of 6 cm. A recent observation using a trans-Canadian baseline indicates that the source is unresolved at an operating frequency of 600 Mc/s and an effective baseline of 6 million wavelengths.
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References
Palmer, H. P., Rowson, B., Anderson, B., Donaldson, W., Miley, Q. K., Gent, H., Adgie, R. L., Slee, O. B., and Crowther, J. H., Nature, 213, 789 (1967).
Le Roux, E., Ann. d'Astrophys., 24, 71 (1961).
Hanbury Brown, R., and Twiss, R. Q., Phil. Mag., 45, 663 (1954).
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GUBBAY, J., ROBERTSON, D. Nine Million Wavelength Baseline Interferometer Measurements of 3C 273B. Nature 215, 1157–1158 (1967). https://doi.org/10.1038/2151157a0
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DOI: https://doi.org/10.1038/2151157a0
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