Computer Science
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ssrv...40..313h&link_type=abstract
Space Science Reviews, Volume 40, Issue 1-2, pp. 313-316
Computer Science
5
Scientific paper
The ESA satellite COS-B viewed the Cyg-X region 7 times between November 1975 and March 1982. A search for periodic gamma-ray emission (E > 70 MeV) from Cyg X-3 at the characteristic ˜4.8 h period did not reveal the source. Combining all observations, the 2σ upperlimit (E > 70 MeV) on the flux for the phase interval in which X-ray emission has been detected is 1.0 × 10-6 ph cm-2 s-1 and for the phase intervals in which ultra-high-energy (E ≳ 500 GeV) gamma-ray emission has been reported ˜1.0 × 10-7 ph cm-2 s-1. This is about one and two orders of magnitude, repectively, below the flux reported earlier by the SAS-2 team. A comparison of the spatial gamma-ray distribution in the Cyg-X region measured by SAS-2 and COS-B with the total-interstellar-gas distribution leads to the conclusion that in both cases, COS-B and SAS-2, no source has been detected at the position of Cyg X-3 in addition to the diffuse gamma-ray emission expected from the total-gas distribution.
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