= Lijun Gou
{c}
{tag=Physicist}
<Lijun Gou> coauthored an estimate of <black-hole spin> in <Cygnus X-1> using the thermal <spectrum> of its <accretion disk>. The analysis combines independent constraints on <mass>, <distance> and inclination with a relativistic thin-disk model to infer an inner emitting radius and hence a spin parameter.<The Extreme Spin of the Black Hole in Cygnus X-1 by Lijun Gou and others>[Abstract: continuum fitting and external parameter uncertainties]{ref}
This is a model-based inference rather than a direct image of the <event horizon>. Disk geometry, <calibration> and the relation between the spin and orbital axes are part of the interpretation.
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