Long term variability of Cyg X-1 in hard X-rays |
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| Authors: | F Frontera F Fuligni C Cavani |
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| Institution: | 1. Laboratorio Tesre-CNR, Bologna, Italy
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| Abstract: | Results of the analysis of four balloon observations of Cyg X-1 in the energy range 20–200 keV are reported. Long term time variability of the flux is confirmed and is estimated to amount to a factor 1.5–2. The source appears to remain in a state of lower flux for longer times. No obvious correlation with the low energy behaviour following the transition detected by Uhuru is found. |
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