Sporadic And Periodic 10-1000 Tev Gamma-Rays From Cygnus-X-3

view Abstract Citations (10) References (16) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Sporadic and Periodic 10--1000 TeV Gamma Rays from Cygnus X-3 Baltrusaitis, R. M. ; Cassiday, G. L. ; Cooper, R. ; Dawson, B. R. ; Elbert, J. W. ; Fick, B. E. ; Gerhardy, P. R. ; Green, K. D. ; Liebing, D. F. ; Lingle, C. P. ; Loh, E. C. ; Sokolsky, P. ; Sommers, P. ; Steck, D. Abstract 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. Publication: The Astrophysical Journal Pub Date: December 1987 DOI: 10.1086/165864 Bibcode: 1987ApJ...323..685B Keywords: Cygnus Constellation; Radio Bursts; Stellar Radiation; Stellar Spectra; X Ray Binaries; Emission Spectra; Gamma Ray Astronomy; Stellar Models; Astrophysics; GAMMA RAYS: GENERAL; STARS: INDIVIDUAL CONSTELLATION NAME: CYGNUS X-3; X-RAYS: BINARIES full text sources ADS | data products SIMBAD (2)