The compact black hole primary in the X-ray binary Cygnus X-1, has recently been characterised by observation. This data can be analysed to test models of black hole gravitational physics. Using the optimum observational data with the least fit parameters, the average of 3 spectral data sets revealed an averaged inner rim accretion disc radius Rin = 2.24 GM/c2. Using the Kerr spinning black hole model results in a theoretical apparent reduction in Rin…
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