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Interstellar scattering, the North Polar Spur, and a possible new class of compact galactic radio sources
Rickard, J. J.; Cronyn, W. M.
AA(Iowa, University, Iowa City, Iowa), AB(Clark Lake Radio Observatory, Borrego Springs, Calif.)
Astrophysical Journal, Part 1, vol. 228, Mar. 15, 1979, p. 755-762. (ApJ Homepage)
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NASA/STI Keywords:
Extragalactic Radio Sources, Interplanetary Medium, Interstellar Matter, Pulsars, Radio Scattering, Turbulence Effects, Brightness Temperature, Nonthermal Radiation, Scintillation, Statistical Analysis
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Claims for a galactic-latitude dependence of interstellar angular broadening based on interplanetary-scintillation (IPS) observations are investigated. Analysis of the statistics of the angular sizes in an IPS survey shows that there is no evidence for increased angular broadening in the galactic plane. A region of sky about 500 sq deg of arc in area is considered in which significant angular broadening is thought to exist. An association between this region and the nearby North Polar Spur is proposed on the basis of the former's extension off the galactic plane to high latitudes. An evaluation of two-frequency angular-broadening measurements suggests that the data used to support the conclusion about a galactic-latitude dependence are not statistically significant. A study of pulsar data and implications for the angular broadening expected in the interstellar medium for sources at galactic latitudes below + or - 10 deg indicates the possible existence of a previously unsuspected class of compact galactic nonthermal radio sources, designated 'scintars'.

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