Abstract
WE have recently measured the pulsed emission of high energy X-rays from the Crab Nebula pulsar NP 0532. Pulsation of the low energy X-ray flux with the characteristic period and double peaks seen in the radio1 and optical2 spectral regions was first reported by Fritz et al.3 and later by Bradt et al.4. The latter were able to establish correspondence between the visible and X-ray pulses by simultaneous observations. Fishman et al.5 have reported that the pulsar also appears in data taken in 1967 at the high end (greater than 35 keV) of the Crab X-ray spectrum.
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References
Comella, J. M., Craft, jun., H. D., Lovelace, R. V. E., Sutton, J. M., and Tyler, G. L., Nature, 221, 453 (1969).
Warner, B., Nather, R. E., and MacFarlane, M., Nature, 222, 233 (1969).
Fritz, G., Henry, R. C., Meekins, J. F., Chubb, T. A., and Friedman, H., Science, 164, 709 (1969).
Bradt, H., Rappaport, S., Mayer, W., Nather, R. E., Warner, B., Mac-Farlane, M., and Kristian, J., Nature, 222, 728 (1969).
Fishman, A. J., Harnden, jun., F. R., and Haymes, R. C., Astrophys. J. Lett., 156, L107 (1969).
Floyd, F. W., Nature, 222, 967 (1969).
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FLOYD, F., GLASS, I. & SCHNOPPER, H. Hard X-Rays from the Crab Pulsar. Nature 224, 50–51 (1969). https://doi.org/10.1038/224050a0
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DOI: https://doi.org/10.1038/224050a0
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