A Hard X-Ray View of Scorpius X-1 with INTEGRAL: Nonthermal Emission?
作者： T. Di Salvo , P. Goldoni , L. Stella , M. van der Klis , A. Bazzano
DOI: 10.1086/508489
关键词:
摘要: We present here simultaneous INTEGRAL/RXTE observations of Sco X-1 and in particular a study the hard X-ray emission source its correlation with position Z track color-color diagram. find that (above about 30 keV) is dominated by power-law component photon index ~3. The flux slightly decreases when moves diagram sense increasing inferred mass accretion rate from horizontal branch to normal branch/flaring vertex. It becomes not significantly detectable flaring branch, where has decreased an order magnitude. These results close analogies behavior GX 17+2, one so-called Sco-like sources. Finally, power law spectrum does show any evidence high-energy cutoff up 100-200 keV, strongly suggesting nonthermal origin this component.
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