Abstract
OBSERVATIONS of gamma rays of energy greater than 3 × 1012 eV with a flux of 5 × 10−11 photons cm−2 s−1 from the pulsar CP 1133 have been reported by O'Mongain et al.1. In addition, Charman et al.2 reported a pulsed flux of 2 × 10−12 photons cm−2 s−1 above an energy 7 × 1013 eV. Fazio et al.3 do not observe gamma rays above 3 × 1012 eV from CP 1133 (or from some other pulsars), but their upper limits are consistent with the results of O'Mongain et al. Here I examine the ways in which these high energy photons can be produced and derive some implications from the observations.
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O'Mongain, E. P., Porter, N. A., White, J., Fegan, D. J., Jennings, D. M., and Lawless, B. G., Nature, 219, 1348 (1968).
Charman, W. N., Jelley, J. V., Orman, P. R., Drever, R. W. P., and McBreen, B., Nature, 220, 565 (1968).
Fazio, G. G., Helmken, H. F., Rieke, G. H., and Weekes, T. C., Nature, 220, 592 (1968).
Kristian, J., Ap. J. Lett., 154, L99 (1968).
Maran, S., and Cameron, A. G. W., Physics Today, 21, No. 8 41 (1968).
Cameron, A. G. W., Nature, 205, 787 (1965).
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APPARAO, M. Implications of Observations of Very High Energy Gamma Rays from Pulsars. Nature 221, 645 (1969). https://doi.org/10.1038/221645a0
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DOI: https://doi.org/10.1038/221645a0
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