Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983acasn..24...19q&link_type=abstract
(Acta Astronomica Sinica, vol. 24, no. 1, 1983, p. 19-22) Chinese Astronomy and Astrophysics (ISSN 0275-1062), vol. 7, Sept. 198
Astronomy and Astrophysics
Astronomy
Galactic Structure, Radio Astronomy, Radio Galaxies, Diameters, Electron Density (Concentration), Interstellar Matter, Scintillation, Wave Scattering
Scientific paper
Results are presented of scintillation observations of the radio galaxy Cygnus A at 81.5 MHz which show that its hotspots have diameters greater than 6 arcsec, much greater than the 2 arcsec diameter observed at 5000 MHz. These findings indicate that the increase in the apparent size at 81.5 MHz of the hotspots of Cyg A is a result of scattering by an inhomogeneous interstellar medium, which will lead to a size that increases with increasing wavelength. This conclusion indicates that the medium in the direction of Cyg A is highly turbulent, with a fluctuation in electron density about two orders of magnitude greater than the typical value inferred from pulsar observations.
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