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We present the analysis of the broadened, flourescent iron Kalpha line insimultaneous XMM-Newton and RXTE data from the black hole Cygnus X-1. TheXMM-Newton data were taken in a modified version of the timing mode of theEPIC-pn camera. In this mode the lower energy threshold of the instrument isincreased to 2.8 keV to avoid telemetry drop outs due to the brightness of thesource, while at the same time preserving the signal-to-noise ratio in the FeKalpha band. We find that the best-fit spectrum consists of the sum of anexponentially cut off power-law and relativistically smeared, ionizedreflection. The shape of the broadened Fe Kalpha feature is due to strongCompton broadening combined with relativistic broadening. Assuming a standard,thin accretion disk, the black hole is close to rotating maximally.

The broad iron Kalpha line of Cygnus X-1 as seen by XMM-Newton in the EPIC-pn modified timing mode