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The Hard X-Ray Emission from Scorpius X-1 Seen by INTEGRALWe present the results of our hard X-ray and gamma-ray study of the LMXB Sco X-1 utilizing INTEGRAL data as well as contemporaneous RXTE PCA data. We have investigated the hard X-ray spectral properties of Sco X-1 including the nature of the high-energy, nonthermal component and its possible correlations with the location of the source on the soft X-ray color-color diagram. We find that Sco X-1 follows two distinct spectral tracks when the 20-40 keV count rate is greater than 130 counts/second. One state is a hard state which exhibits a significant high-energy, powerlaw tail to the lower energy thermal spectrum. The other state shows a much less significant high-energy component. We found suggestive evidence for a correlation of these hard and soft high-energy states with the position of Sco X-1 on the low-energy X-ray color-color diagram. We have searched for similar behavior in 2 other Z sources: GX 17+2 and GX 5-1 with negative results.
Document ID
20080037795
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Sturner, Steve
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Shrader, C. R.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 24, 2013
Publication Date
September 8, 2008
Subject Category
Astronomy
Meeting Information
Meeting: 7th INTEGRAL Workshop: An INTEGRAL View of Compact Objects
Location: Copenhagen
Country: Denmark
Start Date: September 8, 2008
End Date: September 11, 2008
Funding Number(s)
CONTRACT_GRANT: NNG06EO90A
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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