Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-01-22
Astronomy and Astrophysics
Astrophysics
6 pages, 2 figures; Presented at the 33rd COSPAR Scientific Assembly (Warsaw, Poland, 2000 July); Accepted for publication in
Scientific paper
10.1016/S0273-1177(01)00436-7
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.
D'Amico Flavio
Gruber Duane E.
Heindl William A.
Pelling Michael
Peterson Laurence E.
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