The Structure of Magnetically Dominated Energy Extracting Black Hole Magnetospheres: Dependencies on Field Line Angular Velocity.

If the inner light surface of a force-free black hole magnetosphere lies within the ergoregion that magnetosphere can extract the black holeu0027s rotational energy and transmit it to distant observers. We take the distribution of magnetic field line angular velocity on the horizon to be a useful proxy for inner light surface location and study how different distributions affect the structure of energy-extracting magnetospheres. We find that distributions that most naturally correspond to the presence of nearby accreting matter structures also give rise to magnetosphere structures compatible with the presence of a jet, suggesting that in practical terms black hole energy extraction might often be coupled to jet launching. We also find over a factor of 100 in jet-like luminosity differences that are directly attributable to variations in magnetosphere structure and independent of black hole spin.