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Ultrahigh-Energy Pulsed Emission from Hercules X-1 with Anomalous Air-Shower Muon Production

1988; American Physical Society; Volume: 61; Issue: 17 Linguagem: Inglês

10.1103/physrevlett.61.1906

1092-0145

B. L. Dingus, D. E. Alexandreas, R. C. Allen, R. L. Burman, K. B. Butterfield, R. Cady, C.Y. Chang, R. W. Ellsworth, J. A. Goodman, Sunil Gupta, T. J. Haines, D. Krakauer, J. Lloyd‐Evans, D. E. Nagle, M. Potter, V. D. Sandberg, R. L. Talaga, C.A. Wilkinson, G. B. Yodh,

Neutrino Physics Research

A search for bursts of air-shower events from Hercules X-1 at energies above 50 TeV during the calendar period 2 April 1986 to 5 July 1987 yielded two significant bursts, both occurring on UT 24 July 1986. The events during these bursts were pulsed with a period of 1.235 68 s, significantly different from estimates of the contemporaneous x-ray period. The probability that this represents random statistical fluctuations of the background is estimated to be 2 \ifmmode\times\else\texttimes\fi{} ${10}^{\ensuremath{-}5}$. The muon content of the burst events is anomalous when compared with expectations from $\ensuremath{\gamma}$-ray showers.