Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.211..369b&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 211, Nov. 15, 1984, p. 369-373.
Astronomy and Astrophysics
Astronomy
3
Astronomical Spectroscopy, Extragalactic Radio Sources, Interplanetary Medium, Radio Astronomy, Scintillation, Angular Distribution, Plasma Jets, Power Spectra
Scientific paper
Metre-wavelength interplanetary scintillation (IPS) observations give the overall angular sizes ψ of scintillating compact structures in radio sources. From 326.5-MHz IPS data for a sample of faint (Ooty) radio sources, log ψ versus log LAS is seen, on average, to have a slope 0.2. A similar trend is seen from 81.5-MHz IPS data for a sample of strong, powerful (3CR) double sources, although the slope is 0.4 and the mean ψ about four times larger. If ψ represents the hotspot size, the log ψ-log LAS correlation has a bearing on the collimation of extended jets in powerful double radio sources. A similar relation derived from direct observations of hotspots in such sources chosen to minimize projection effects has been found to have a slope 0.7. The author shows that projection effects are partly responsible for the small value 0.4 of the slope of the log ψ-log LAS correlation. Blending effects in the IPS observations probably account for the remaining flattening.
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