Staelin D H, Reifenstein E C
Science. 1968 Dec 27;162(3861):1481-3. 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 10(20) electrons per square centimeter lie in the direction of NP 0527 and NP 0532, respectively.
在蟹状星云附近发现了两个新的脉冲射电源,分别命名为NP 0527和NP 0532,它们可能与蟹状星云重合。这两个源都是间歇性的,没有明显的周期性。脉冲色散表明,在NP 0527和NP 0532方向上每平方厘米分别有1.58±0.03和1.74±0.02×10²⁰个电子。