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The black hole binary Cygnus X-1 was observed in late-2012 with the NuclearSpectroscopic Telescope Array (NuSTAR) and Suzaku, providing spectral coverageover the ~1-300 keV range. The source was in the soft state with amulti-temperature blackbody, power-law, and reflection components along withabsorption from highly ionized material in the system. The high throughput ofNuSTAR allows for a very high quality measurement of the complex iron lineregion as well as the rest of the reflection component. The iron line isclearly broadened and is well-described by a relativistic blurring model,providing an opportunity to constrain the black hole spin. Although the spinconstraint depends somewhat on which continuum model is used, we obtain a*>0.83for all models that provide a good description of the spectrum. However, noneof our spectral fits give a disk inclination that is consistent with the mostrecently reported binary values for Cyg X-1. This may indicate that there is a>13 degree misalignment between the orbital plane and the inner accretion disk(i.e., a warped accretion disk) or that there is missing physics in thespectral models.

The Reflection Component from Cygnus X-1 in the Soft State Measured by NuSTAR and Suzaku