Fig. 5

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Output images of the photon bundle edition of Omega for four different values of the dimensionless angular momentum, j: 0, 0.5, 0.9, and 0.998, from left to right. We see the BH event horizon (central black sphere), the ergosphere (gray ellipsoid or spindle torus), and the AD (yellow torus). Solid blue lines are trajectories of photons emitted from the AD. Dashed purple lines are trajectories that would have to originate from the event horizon, and dotted red lines are photons that arrive from outside the system. The latter two bring no additional radiation into the structure.
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