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We report on a Suzaku observation of the newly discovered X-ray binary MAXIJ1836-194. The source is found to be in the hard/intermediate spectral stateand displays a clear and strong relativistically broadened iron emission line.We fit the spectra with a variety of phenomenological, as well as physicallymotivated disk reflection models, and find that the breadth and strength of theiron line is always characteristic of emission within a few gravitational radiiaround a black hole. This result is independent of the continuum used andstrongly points toward the central object in MAXI J1836-194 being a stellarmass black hole rotating with a spin of $a=0.88\pm0.03$ (90% confidence). Wediscuss this result in the context of spectral state definitions, physicalchanges (or lack thereof) in the accretion disk and on the potential importanceof the accretion disk corona in state transitions.

Suzaku Observation of the Black Hole Candidate MAXI J1836-194 in a Hard/Intermediate Spectral State