Abstract
Shklovsky and Sheffer1 have recently raised the interesting possibility that the galactic radio spurs could be soft X-ray sources. As radio spurs have often been considered to be very old supernova remnants2,3, and since three old remnants have been found to be soft X-ray sources4,5, this idea has particular merit. Shklovsky and Sheffer point out that the soft X-ray (0.21 to 0.28 keV) map of Bowyer et al.6 shows enhanced emission in the northern galactic hemisphere in a region coincident with secondary radio ridges of the North Polar Spur7 and that this correlation may provide experimental verification of the hypothesis concerning the possible supernova remnant origin of the spurs.
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