Pair plasma production in a force-free magnetosphere around a supermassive black hole

摘要

We quantitatively solve the problem of plasma supply to the stationary, axisymmetric, force-free mag- netosphere of a rotating black hole residing in an active galactic nucleus. At the plasma source from which both inflowing and outflowing charge-separated plasmas originate, the shortage of charge will lead to the emergence of a strong electric fields along the magnetic field line. The parallel electric field acceler- ates migratory electrons and/or positrons to ultrarelativistic energies. These relativistic electrons/ positrons scatter background photons to produce high-energy γ-rays that can materialize as pairs by colliding with background photons.