Variability in the high energy gamma ray emission from CYG X-3 over a two-year period (1983 - 1984) at E 4 X 10(11) eV

Details Variability in the high energy gamma ray emission from CYG X-3 over a two-year period (1983 - 1984) at E 4 X 10(11) eV Variability in the high energy gamma ray emission from CYG X-3 over a two-year period (1983 - 1984) at E 4 X 10(11) eV

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icrc....1...87c&link_type=abstract

In NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 1 p 87-90 (SEE N85-33902 22-93)

Other

Cosmic Ray Showers, Cygnus Constellation, Gamma Ray Bursts, Time Dependence, Variability, Binary Stars, Cerenkov Radiation, Interstellar Radiation, Monte Carlo Method, Photon Beams, Proton Irradiation, X Ray Binaries

Scientific paper

Cygnus X-3 is observed to emit gamma rays with energies in excess of 4 x 10 to the 11th power eV during two out of 9 observational categories over an 18 month time span. The emissions are observed at the 0.6 phase of the characteristic 4.8 hr light curve for this binary system. We estimate a peak flux at phase 0.6 of 5 x 10 to the minus 10th power photons cm-2s-1 at a software threshold of 8 x 10 to the 11th power eV for Oct/Nov 1983. A flux for the June 84 effect cannot be reliably calculated at present due to lack of Monte Carlo simulations for the energy range and spectral region. For the other 7 observational categories the observations are consistent with zero source emission. The light curve would appear to be variable on a time scale of a couple of weeks at these categories. Selection of compact images in accordance with Monte Carlo simulations combined with empirical optimization techniques have led to an enriched gamma ray light curve for the Oct/Nov 1983 data. Selection on the basis of shower orientation, however, has not led to any notable enhancement of the gamma ray content. Individual Cherenko images can be reliably sorted on an event by event basis into either proton-induced or photon-induced showers.

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