Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...269..119j&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 269, no. 1-2, p. 119-127.
Astronomy and Astrophysics
Astronomy
2
Interplanetary Medium, Interstellar Matter, Light Scattering, Radio Sources (Astronomy), Scintillation, Angular Distribution, Diameters
Scientific paper
Data obtained between 1984 and 1987, using a radio telescope (RT) with a 10,000 sq m dipole array operating at 103 MHz, was used to determine the angular diameters of fourteen strongly scintillating radio sources. The method used exploited the technique of interplanetary scintillation (IPS), wherein the systematic variation of scintillation index with solar elongation was used as a unique indicator of the source size. The method has been used before but these are the first measurements at 103 MHz. These values were then used in conjunction with similar available measurements at 151.5 MHz to determine the contribution of interstellar scattering (ISS) to source broadening at 103 MHz. Enhanced scattering due to ISS in the plane of the galaxy has been confirmed.
Alurkar Sadanand K.
Janardhan Padmanabhan
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