High-energy gamma radiation from a black hole: slow accretion with friction.

Details High-energy gamma radiation from a black hole: slow accretion with friction. High-energy gamma radiation from a black hole: slow accretion with friction.

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jetp...69..871b&link_type=abstract

Sov. Phys. - JETP, Vol. 69, No. 5, p. 871 - 875

Physics

1

Black Holes: Gamma Rays

Scientific paper

The authors consider the production of high-energy gamma rays (Eγ ≡ 100 MeV) near a black hole through the collision of protons in stable orbits in an accretion disk. Spherical accretion at a slow pace yields a self-consistent model. When the accretion rate is M ⪉ 10-3 of the Eddington limit, proton orbits in the gravitational field of the black hole contract, due to friction with the hot electron gas. The authors refer to this type of motion as accretion with friction. Gamma radiation results from the decay of neutral pions created by collisions between relativistic protons moving in the vicinity of stable orbits. They conclude by showing that this mechanism can give rise to a detectable gamma flux from both galactic and extragalactic sources.

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