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HEXTE Studies of Sco X-1 Spectra: Detections of Hard X-Ray Tails Beyond 200 keV | | F. D’Amico
; W. A. Heindl
; R. E. Rothschild
; L. E. Peterson
; D. E. Gruber
; M. Pelling
; J. A. Tomsick
; | | Date: |
22 Dec 2000 | | Subject: | astro-ph | | Affiliation: | 1 and 2), W. A. Heindl , R. E. Rothschild , L. E. Peterson , D. E. Gruber , M. Pelling , and J. A. Tomsick ( INPE, S. J. dos Campos, Brazil, - CASS/UCSD, La Jolla, CA | | 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 PCA/RXTE 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. | | Source: | arXiv, astro-ph/0101396 | | Services: | Forum | Review | PDF | Favorites | |
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