Abstract
IT has been proposed1 that the extended belt of radio emission known as the North Polar Spur is a shell source derived from a supernova explosion. If this hypothesis is true, the Spur is expected to resemble the Cygnus Loop, since the radio surface brightnesses are similar. So far there is no evidence2 that the Spur is associated with optical emission similar to that observed in the Cygnus Loop. However, on the basis of the recent discovery3 of an X-ray source within the loop defined by the Spur, Shklovsky has suggested that the source may be interpreted as a neutron star which is the relic of the original supernova. It is possible to check this idea by reference to radio observations.
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QUIGLEY, M., HASLAM, C. Association of the Galactic Radio Spur with the Scorpio X-ray Source. Nature 203, 1272 (1964). https://doi.org/10.1038/2031272a0
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DOI: https://doi.org/10.1038/2031272a0
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