Search for microarcsecond structure in low-frequency variable radio sources

Details Search for microarcsecond structure in low-frequency variable radio sources Search for microarcsecond structure in low-frequency variable radio sources

Oct 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977aj.....82..785a&link_type=abstract

Astronomical Journal, vol. 82, Oct. 1977, p. 785-790.

Astronomy and Astrophysics

Astronomy

19

Astronomical Catalogs, Interstellar Space, Radio Sources (Astronomy), Scintillation, Astronomical Models, Diameters, Intergalactic Media, Low Frequencies, Pulsars

Scientific paper

A search for interstellar scintillation (ISS) of low-frequency variable radio sources is reported. Observations of 28 confirmed or suspected low-frequency variables, 21 nonvariable sources, and two pulsars were made at 408 MHz. As expected, the pulsars showed ISS, but scintillation was not detected in any other source. A typical upper limit to the rms modulation due to ISS is 150 mJy, giving lower limits to the apparent angular diameter of about 10 to the -6th arcsec. The possibilities that a true point source is broadened to an apparent angular diameter greater than or roughly equal to 10 to the -6th arcsec by scattering local to the source or in a general intergalactic medium are discussed.

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