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Accretion disk reflection spectra, including broad iron emission lines, bearthe imprints of the strong Doppler shifts and gravitational red-shifts close toblack holes. The extremity of these shifts depends on the proximity of theinnermost stable circular orbit to the black hole, and that orbit is determinedby the black hole spin parameter. Modeling relativistic spectral features,then, gives a means of estimating black hole spin. We report on the results offits made to archival X-ray spectra of stellar-mass black holes and black holecandidates, selected for strong disk reflection features. Following recentwork, these spectra were fit with reflection models and disk continuum emissionmodels (where required) in which black hole spin is a free parameter. Althoughour results must be regarded as preliminary, we find evidence for a broad rangeof black hole spin parameters in our sample. The black holes with the mostrelativistic radio jets are found to have high spin parameters, though jets areobserved in a black hole with a low spin parameter. For those sources withconstrained binary system parameters, we examine the distribution of spinparameters versus black hole mass, binary mass ratio, and orbital period. Wediscuss the results within the context of black hole creation events,relativistic jet production, and efforts to probe the innermost relativisticregime around black holes.

Stellar-mass Black Hole Spin Constraints from Disk Reflection and Continuum Modeling