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Theory & Computational AP — Picture 2 AGN Engine

Image Credit: Mike Cai
If the accretion disk around a rotating black hole is threaded by a magnet field, The rotation of the disk and the black hole (and hence the spacetime) will cause the field lines to form a helix-like structure. As matter accretes onto the black hole, part of it is ejected along the field lines, forming a collimated outflow. If there are field lines connecting the disk and the black hole, the rotational energy of the black hole can also be extracted to power the jet.

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