Key points are not available for this paper at this time.
The authors have discovered a 50 ms X-ray pulsar in the Crab-like LMC supernova remnant 0540-693. The pulsar is spinning down with P= 4.79×10-13s s-1, implying a characteristic age of 1660 yr and an energy loss rate of E= 1.5×1038ergs s-1, one-third that of the Crab pulsar. The X-ray luminosity of the surrounding nebula is LX ≈ 1037ergs s-1. Unlike the Crab, the X-ray pulse shape is approximately sinusoidal with one broad maximum per period, and the ratio of pulsed luminosity (in the range 0.2 - 0.4 keV) to Eis an order of magnitude greater than that of the Crab pulsar.
Seward et al. (Sat,) studied this question.