1000 GeV gamma rays from Cygnus X-3: an update

Details 1000 GeV gamma rays from Cygnus X-3: an update 1000 GeV gamma rays from Cygnus X-3: an update

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icrc....1...79c&link_type=abstract

In NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 1 p 79-82 (SEE N85-33902 22-93)

Physics

Cerenkov Radiation, Cosmic Ray Showers, Cygnus Constellation, Gamma Ray Beams, Periodic Variations, Rayleigh Distribution, Root-Mean-Square Errors, Extraterrestrial Radiation, Interstellar Radiation, X Ray Binaries

Scientific paper

Measurements of 1000 GeV gamma-rays from Cygnus X-3 made with the University of Durham facility at Dugway, Utah in 1981/82 are reviewed. The light curve of the 4.8 hour modulated emission is updated and shows evidence significant at the 4.4 sigma level for strong emission (9% of the cosmic ray rate) at phase 0.625 and less significant (1.4 sigma level) indications of weaker emission (3% of the cosmic ray rate) at phase 0.125. The effect constituting the excess on the few nights showing the strongest emission appears to arise from the smallest Cerenkov light signals suggesting a steep gamma-ray spectrum. The 1982 data have been searched unsuccessfully for evidence of emission at phase 0.2, in coincidence with the results from the ultra-high energy (extensive Air Showers (EAS) measurements in 1979-1982. A systematic investigation of a long term variation in the strength of the peak of the 4.8 hr modulated 1000 GeV gamma-ray emission has been made. We find that in addition to the approximately 34 d variation reported by us previously, a stronger effect exists at around 19d.

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