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Radio sources: angular size from scintillation studies.

M H Cohen, E J Gundermann, H E Hardebeck

    Science (New York, N.Y.)
    |August 12, 1966
    PubMed
    Summary
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    Interplanetary scintillation analysis offers a sensitive method for estimating radio source diameters. This technique achieved higher resolution than radio interferometry or lunar occultations for sources like 3C 138 and 3C 273.

    Area of Science:

    • Astronomy and Astrophysics
    • Radio Astronomy

    Background:

    • Estimating the angular diameter of extragalactic radio sources is crucial for understanding their physical properties.
    • Previous methods like radio interferometry and lunar occultations have limitations in resolution.

    Purpose of the Study:

    • To investigate the potential of interplanetary scintillation (IPS) for measuring the angular sizes of compact radio sources.
    • To compare the resolution achieved by IPS with existing techniques.

    Main Methods:

    • Analyzing the frequency spectrum of fluctuations caused by interplanetary scintillations.
    • Observing specific radio sources (3C 138, 3C 245, 3C 267, 3C 273) using IPS.

    Main Results:

    • Determined angular diameters for 3C 138 (0.1 arcsec), 3C 245 (<=0.04 arcsec), 3C 267 (<=0.2 arcsec), and 3C 273 (<=0.02 arcsec).

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  • Achieved a resolution at least five times higher than previously possible with radio interferometers or lunar occultations.

    • Conclusions:

    • Interplanetary scintillation provides a sensitive and high-resolution method for estimating radio source diameters.
    • IPS technique offers a significant advancement in resolving small angular structures in radio sources.