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  • 1
    Electronic Resource
    Electronic Resource
    Long term variability of Cyg X-1 in hard X-rays (1975)
    Springer
    Astrophysics and space science 32 (1975), S. 197-203 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00646225
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