@Article{DAmicoHeRoPeGrPeTo:2001:DeHaXr,
               author = "D'Amico, Fl{\'a}vio and Heindl, W. A. and Rothschild, R. E. and 
                         Peterson, L. E. and Gruber, D. E. and Pelling, M. and Tomsick, J. 
                         A.",
                title = "HEXTE studies of SCO X-1 spectra: detections of hard X-ray tails 
                         beyond 200 Kev",
              journal = "Advances in Space Research",
                 year = "2001",
               volume = "28",
               number = "2-3",
                pages = "389--394",
             keywords = "ASTROF{\'{\I}}SICA, espectro raio X, estrela de neutron, 
                         binarias raio X, buracos negros, X ray spectra, neutron stars, X 
                         ray binaries, black holes.",
             abstract = "Using the HEXTE experiment on-board the RXTE satellite, we 
                         performed a search for hard X-ray tails in Sco X-1 spectra. We 
                         found strong evidence for the presence of such a non-thermal 
                         component on several occasions. Using the PCAIRXTE we were able to 
                         track the position of the source along the Z diagram, and we 
                         observed that the presence of the hard X-ray tail is not confined 
                         to a particular region. However, we found a correlation between 
                         the power law index of the non-thermal component and the position 
                         of the source in the Z diagram, suggesting that the hard X-ray 
                         spectrum (i.e., E > 50 keV)becomes flatter as the mass accretion 
                         rate increases. We were also able to study the temporal variation 
                         of the appearance/absence of the hard X-ray component. With our 
                         derived luminosities, we were also able to test the idea that 
                         X-ray luminosities can be used to distinguish between X-ray binary 
                         systems containing neutron stars and black holes.",
                 issn = "0273-1177",
                label = "9618",
             language = "en",
           targetfile = "1-s2.0-S0273117701004367-main.pdf",
        urlaccessdate = "18 maio 2024"
}