Sporadic and periodic 10-1000 TeV gamma rays from Cygnus X-3

Details Sporadic and periodic 10-1000 TeV gamma rays from Cygnus X-3 Sporadic and periodic 10-1000 TeV gamma rays from Cygnus X-3

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...323..685b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 323, Dec. 15, 1987, p. 685-689.

Astronomy and Astrophysics

Astronomy

10

Cygnus Constellation, Radio Bursts, Stellar Radiation, Stellar Spectra, X Ray Binaries, Emission Spectra, Gamma Ray Astronomy, Stellar Models

Scientific paper

During 1985 June, July, August, and October, small air showers from the direction of Cygnus X-3 were observed using the University of Utah Fly's Eye. Useful spectral information was obtained from these showers. The combined data from 1985 June, July, and August show a 3.9 σ excess at 4.8 hr phase 0.65-0.70 for showers with energies above 100 TeV. The excess flux, averaged over all phases is 4.5 ± 1.2 x 10-13 cm-2 s-1. During a short run in 1985 October, following a Cyg X-3 radio outburst, only upper limits for the fluxes were obtained. Evidence was obtained for a sporadic outburst in 1985 June 17 UT. The outburst occurred at various phases of the 4.8 hr Cygnus X-3 period. Part of the signal above 250 TeV was near phase 0, when the companion star eclipses the neutron star in some models of Cygnus X-3. The energy flux during the outburst was about 10-8 ergs cm-2 s-1, which is quite large compared with long-term periodic fluxes. Averaged over all the observing time, however, the sporadic flux is roughly comparable to the periodic flux.

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