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|a Tomsick, John A.
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|a MIT Kavli Institute for Astrophysics and Space Research
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|a Nowak, Michael A.
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|a Nowak, Michael A.
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|a Parker, Michael
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|a Miller, Jon M.
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|a Fabian, Andrew C.
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|a Harrison, Fiona A.
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|a Bachetti, Matteo
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|a Barret, Didier
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|a Boggs, Steven E.
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|a Christensen, Finn E.
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|a Craig, William W.
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|a Forster, Karl
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|a Furst, Felix
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|a Grefenstette, Brian W.
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|a Hailey, Charles J.
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|a King, A. L.
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|a Madsen, Kristin K.
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|a Natalucci, Lorenzo
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|a Pottschmidt, Katja
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|a Ross, Randy R.
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|a Stern, Daniel
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|a Walton, Dominic J.
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|a Wilms, Jörn
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|a Zhang, William W.
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|a The reflection component from Cygnus X-1 in the soft state measured by Nustar and Suzaku
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|b IOP Publishing,
|c 2015-01-12T18:05:34Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/92794
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|a The black hole binary Cygnus X-1 was observed in late 2012 with the Nuclear Spectroscopic Telescope Array (NuSTAR) and Suzaku, providing spectral coverage over the ~1-300 keV range. The source was in the soft state with a multi-temperature blackbody, power law, and reflection components along with absorption from highly ionized material in the system. The high throughput of NuSTAR allows for a very high quality measurement of the complex iron line region as well as the rest of the reflection component. The iron line is clearly broadened and is well described by a relativistic blurring model, providing an opportunity to constrain the black hole spin. Although the spin constraint depends somewhat on which continuum model is used, we obtain a * > 0.83 for all models that provide a good description of the spectrum. However, none of our spectral fits give a disk inclination that is consistent with the most recently reported binary values for Cyg X-1. This may indicate that there is a >13° misalignment between the orbital plane and the inner accretion disk (i.e., a warped accretion disk) or that there is missing physics in the spectral models.
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|a United States. National Aeronautics and Space Administration (Contract NNG08FD60C)
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|a en_US
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|a Article
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|t Astrophysical Journal
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