Around all black holes, it is found that there is a globular vacuum (called Axion-Higgs photon alike) collision horizon creating pairs of fermions (e-/e+ etc.) and annihilation effects like gamma rays even found also around the center of the milky way.
The positrons which escape the annihilation ( e-/e+) seem to pair with photons into leptons (Muons, and Taus) and most simple most positive quarks. the result is simple plasma gas around each black hole.
Conclusion: the gamma rays are the tell tails of annihilation of electron positron pairs which are the evidence for its globular production around black holes. which is evidence for the early matter creation after a black hole big bang explosion string knot. ( Big Bang Black Hole Splinters. below)