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Published online by Cambridge University Press: 03 August 2017
The Crab Nebula, remnant of the supernova of 1054, may be observed today in the recombination spectrum of the filamentary component, or in the continuous spectrum of the central amorphous mass. The recent optical discovery of a high degree of polarization in the amorphous component has led to a striking confirmation and general acceptance of the hypothesis first advanced by Shklovsky, which considers the continuous spectrum as emitted by relativistic electrons moving in a magnetic field.
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