Abstract
PROJECTING from the plane of the galaxy are three loops of nonthermal radio emission. Loop I, originally called the North Polar Spur, is 113° in diameter1 and is centred on lII = 330°; bII = 19.5°. The Cetus Arc, now called Loop II, is 92° in diameter2 and is centred at lII = 100; bII = −30°. Loop III is 71° in diameter3 and is centred near the north celestial pole at lII = 124°; bII = 11.5°. It was proposed in ref. 1 that Loop I is the remnant of a supernova close to the Sun, as the radio emission is non-thermal and seems to come from a shell source. If the radio loops are supernova remnants, then we would expect to observe filamentary nebulosity surrounding their radio ridges, as is observed in well known supernova remnants such as the Cygnus Loop.
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ELLIOTT, K. Filamentary Nebulosity in the Vicinity of Loop III. Nature 226, 1236 (1970). https://doi.org/10.1038/2261236a0
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DOI: https://doi.org/10.1038/2261236a0
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