Supernova remnants inside AGN discs can re-collapse into seed clouds that grow and spawn new massive stars, with yields up to hundreds per event for 10^8-solar-mass black holes.
Blandford-Znajek process as a gamma ray burst central engine
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abstract
We investigate the possibility that gamma-ray bursts are powered by a central engine consisting of a black hole with an external magnetic field supported by a surrounding disk or torus. The rotational energy of the black hole can be extracted electromagnetically as a Poynting flux, a mechanism proposed by Blandford and Znajek(1977). Recently observed magnetars indicate that some compact objects have very high magnetic fields, up to $10^{15}$ G, which is required to extract the energy within the duration of a GRB, i.e., in 1000 s or less. We demonstrate also that the Poynting flux need not be substantially dominated by the disk.
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Reincarnations of massive stars in active galactic nucleus discs
Supernova remnants inside AGN discs can re-collapse into seed clouds that grow and spawn new massive stars, with yields up to hundreds per event for 10^8-solar-mass black holes.