Pulsating Radio Sources near the Crab Nebula

Science  27 Dec 1968:
Vol. 162, Issue 3861, pp. 1481-1483
DOI: 10.1126/science.162.3861.1481


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 x 1020 electrons per square centimeter lie in the direction of NP 0527 and NP 0532, respectively.