Implications of ultra-high-energy emission from Hercules X-1

Details Implications of ultra-high-energy emission from Hercules X-1 Implications of ultra-high-energy emission from Hercules X-1

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.318..345e&link_type=abstract

Nature, Volume 318, Issue 6044, pp. 345-347 (1985).

Physics

27

Scientific paper

A 3-min outburst of very-high energy (VHE) quanta, E > 1012 eV, was recently detected from the X-ray pulsar Hercules X-1 (ref. 1). The outburst occurred at a time during the 35-day X-ray modulation that is associated with X-ray turn-on. Temporal analysis of the outburst showed the same 1.24-s modulation that is observed at X-ray energies. Subsequent monitoring of the system at ultra-high energies (UHE) by the Fly's Eye2 yielded evidence for a 40-min outburst of quanta with energies E>1×l014TeV. This UHE outburst also exhibited a 1.24-s modulation. Here we assume the quanta to be γ-rays and show how the interaction of these UHE particles with a precessing accretion disk can explain the observed γ-ray `light' curve. We also discuss the possibility that the emitting UHE particles are accelerated by shocks in an accretion flow as well as the constraints that can be placed on the acceleration mechanism.

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