CYG X-3: not Seen in High-Energy Gamma Rays by Cos-B
Caraveo, P. A.; Bignami, G. F.; Strong, A. W.; Hermsen, W.; Pollock, A. M. T.; Bennett, K.; Buccheri, R.; Mayer-Hasselwander, H. A.; Bloemen, J. B. G. M.; Oezel, M. E.
Netherlands, Italy, Germany, United Kingdom
Abstract
COS-B had Cyg X-3 within its field of view during 7 observation periods between 1975 and 1982 for in total approximately 300 days. In the skymaps (70 meV E 5000 meV) of the Cyg-X region produced for each of these observations and in the summed map, a broad complex structure is visible in the region 72 deg approximately less than 1 approximately less than 85 deg, approximately less than 5 deg. No resolved source structure is visible at the position of Cyg X-3, but a weak signal from Cyg X-3 could be hidden in the structured gamma-ray background. Therefore, the data has been searched for a 4.8 h timing signature, as well as for a source signal in the sky map in addition to the diffuse background structure as estimated from tracers of atomic and molecular gas.