HEXTE Detections of Hard X-Ray Tails in Sco X-1

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dc.creatorD'Amico, F.
dc.creatorHeindl, W. A.
dc.creatorRothschild, R. E.
dc.creatorGruber, D. E.
dc.date2000-08-17
dc.date2000-11-16
dc.date.accessioned2026-07-07T01:54:58Z
dc.date.available2026-07-07T01:54:58Z
dc.descriptionWe report the detection of a non-thermal hard X-ray component from Sco X-1 based upon the analysis of 20-220 keV spectra obtained with the HEXTE experiment on-board the RXTE satellite. We find that the addition of a power-law component to a thermal bremsstrahlung model is required to achieve a good fit in 5 of 16 observations analyzed. Using PCA data we were able to track the movement of the source along the Z diagram, and we found that the presence of the hard X-ray tail is not confined to a specific Z position. However, we do observe an indication that the power law index hardens with increasing mass accretion rate, as indicated from the position on the Z diagram. We find that the derived non-thermal luminosities are at order of 10% of that derived for the brightest of the atoll sources.
dc.description15 pages, 1 ps figure ; uses aastex.cls ; accepted for publication in ApJL
dc.identifierhttps://arxiv.org/abs/astro-ph/0008279
dc.identifierhttp://arxiv.org/abs/astro-ph/0008279
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/1501
dc.subjectAstrophysics
dc.titleHEXTE Detections of Hard X-Ray Tails in Sco X-1
dc.typetext

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