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Relativistically Skewed Iron Emission and Disk Reflection in Galactic Microquasar XTE J1748-288We report evidence for an Fe K-alpha fluorescence line feature in the Very High, High, and Low state X-ray spectra of the galactic microquasar XTE JI748-288 during its June 1998 outburst. Spectral analyses were made on observations spread across the outburst, gathered with the Rossi X-ray Timing Explorer. Gaussian line. disk emission line, relativistic disk emission line, and disk reflection models are fit to the data. In the Very High State, the line profile is strongly redshifted and consistent with emission from the innermost radius of a maximally rotating Kerr black hole, 1.235 R(sub g). The line profile is less redshifted in the High State, but increasingly prominent. In the Low State, the line profile is very strong and centered af approx. 6.7 keV; disk line emission models constrain the inner edge of the disk to fluctuate between approx.20 and approx.59 R(sub g). We trace the disk reflection fraction across the full outburst of this source, and find well-constrained fractions below those observed in AGN in the Very High and High States, but consistent with other galactic sources in the Low State. We discuss the possible implications for black hole X-ray binary system dynamics and accretion flow geometry.
Document ID
20000067638
Acquisition Source
Marshall Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Miller, J. M.
(Massachusetts Inst. of Tech. Cambridge, MA United States)
Fox, D. W.
(Massachusetts Inst. of Tech. Cambridge, MA United States)
DiMatteo, T.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA United States)
Wijnands, R.
(Massachusetts Inst. of Tech. Cambridge, MA United States)
Belloni, T.
(OAB Brera, Italy)
Kouveliotou, C.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Lewin, W. H. G.
(Massachusetts Inst. of Tech. Cambridge, MA United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 2000
Subject Category
Astronomy
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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