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Published January 1976 | Published
Journal Article Open

The Angular Broadening of Radio Sources by Scattering in the Interstellar Medium


The variation with direction of interstellar scattering at 81·5 MHz has been determined by two independent methods based on interplanetary scintillation measurements at 151·5 MHz, presented here, and at 81·5 MHz, already published. The scattering angle, which increases at low galactic latitudes, has a value of 0″·15 ± 0″·05 at 81·5MHz for the lines of sight perpendicular to the galactic plane. The effect of the scattering on the apparent angular diameters of OH and H2O maser sources is discussed.

Additional Information

© 1976 Royal Astronomical Society. Provided by the NASA Astrophysics Data System. (Received 1975 July 18) We thank Messrs R. Dye, D. Rolph and J. Wills, who helped in the day-to-day running of the surveys. PJDS gratefully acknowledges the receipt of a Science Research Council research studentship. ACSR is indebted to the Royal Society for a research fellowship supported by the Weir foundation.

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