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We present measurements of the dimensionless spin parameters and inner-diskinclination of two stellar mass black holes. The spin parameter of SWIFTJ1753.5-0127 and GRO J1655-40 are estimated by modelling the strong reflectionsignatures present in their XMM-Newton observations. Using a newly developed,self-consistent reflection model which includes the blackbody radiation of thedisk as well as the effect of Comptonisation, blurred with a relativistic linefunction, we infer the spin parameter of SWIFT J1753.5-0127 to be 0.76+0.11-0.15. The inclination of this system is estimated at 55+2-7 degrees. ForGRO J1655-40 we find that the disk is significantly misaligned to the orbitalplane, with an innermost inclination of 30+5-10 degrees. Allowing theinclination to be a free parameter we find a lower limit for the spin of 0.90,this value increases to that of a maximal rotating black hole when theinclination is set to that of the orbital plane of J1655-40. Our technique isindependent of the black hole mass and distance, uncertainties in which areamong the main contributors to the spin uncertainty in previous works.

Determining the spin of two stellar-mass black holes from disk reflection signatures