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A Hard X-Ray View of Scorpius X-1 withINTEGRAL: Nonthermal Emission?
We present here simultaneous INTEGRAL/RXTE observations of Sco X-1, and in particular a study of the hard X-ray emission of the source and its correlation with the position in the Z-track of the X-ray color-color diagram. We find that the hard X-ray (above about 30 keV) emission of Sco X-1 is dominated by a power-law component with a photon index of ~3. The flux in the power-law component slightly decreases when the source moves in the color-color diagram in the sense of increasing inferreddoi:10.1086/508489 fatcat:5y2dyasetjbipkoc535p7ppjre