Cygnus X-3 observed at photon energies above 500 GeV

Details Cygnus X-3 observed at photon energies above 500 GeV Cygnus X-3 observed at photon energies above 500 GeV

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.296..543l&link_type=abstract

Nature, vol. 296, Apr. 8, 1982, p. 543, 544. Research supported by the U.S. Department of Energy, California Institute of Techno

Physics

62

Binary Stars, Cosmic Ray Showers, Energetic Particles, Gamma Rays, Photons, X Ray Sources, Cerenkov Counters, Poisson Equation, Pulsars, Stellar Models

Scientific paper

High-energy gamma rays from Cyg X-3 have been observed with the twin 11-m mirrors of NASA JPL's solar energy facility, using the atmospheric Cerenkov technique, resulting in data from about 100,000 air shower events with an approximate threshold energy of 500 GeV for the August 29 to September 6, 1981 period. A positive signal whose amplitude is 10.9 + or - 2.5% of the background cosmic ray rate appears near phase 0.6 of the 4.8-hour cycle, where phase 0.0 corresponds to minimum X-ray emission. This, together with previous Cerenkov detections, indicates that the high energy emission from Cyg X-3 is evolving on a time scale of a few years and suggests that the present form of the system has a recent origin.

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