Figure 7: The spectra emerging from geometrically thin accretion disks around black holes with
different spins, but with the same accretion luminosity [41].From left to right, the curves correspond
to spins ( ) of 0, 0.2, 0.4, 0.6, 0.78, 0.881, 0.936, 0.966, and 0.99. The spin values were chosen
to give roughly equal variation in the position of the spectral peak for spins 0.8. The other
parameters that determine the model are the viscosity parameter, , the inclination of
the observer, , the mass of the black hole, , and the accretion luminosity,
. The peak energies of the spectra increase with increasing spin, as a consequence of
the fact that the ISCO radius decreases with spin.
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