Two new pulsating radio sources, designated NP 0527 and NP 0532, were found near the Crab Nebula and could be coincident with it. Both sources are sporadic, and no periodicities are evident. The pulse dispersions indicate that 1.58 ± 0.03 and 1.74 ± 0.02 × 10 20 electrons per square centimeter lie in the direction of NP 0527 and NP 0532, respectively.
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Staelin et al. (1968) studied this question.
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