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1 results

  • The X-ray spectral and timing properties of a major radio flare episode in Cygnus X-3

  • Karri I. I. Koljonen, Diana C. Hannikainen, Michael L. McCollough, Guy G. Pooley, Sergei A. Trushkin, Robert Droulans
  • Journal:
    Proceedings of the International Astronomical Union / Volume 8 / Issue S290 / August 2012
    Published online by Cambridge University Press:
    21 February 2013, pp. 237-238
    Print publication:
    August 2012
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  • The microquasar Cygnus X-3 is known for massive outbursts that emit radiation from radio to γ-rays associated with jet ejection events. Using Principal Component Analysis to probe fast (~1 min) X-ray spectral evolution followed by subsequent spectral fits to the time-averaged spectra (~3 ks), we find that the overall X-ray variability during major outbursts can be attributed to two components. The spectral evolution of these components are best fitted with hybrid Comptonization and thermal bremsstrahlung components. Most of the X-ray variability is attributed to the hybrid Comptonization component. However, the spectral evolution of the thermal component is linked to a change in the X-ray spectral state. Phase-folding the fit results shows that the thermal component is restricted to two orbital phase regions opposite to each other, possibly indicating a flattened stellar wind from the Wolf-Rayet companion.