Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977phrvd..16.1615p&link_type=abstract
Physical Review D - Particles and Fields, 3rd Series, vol. 16, Sept. 15, 1977, p. 1615-1635.
Astronomy and Astrophysics
Astronomy
40
Black Holes (Astronomy), Stellar Atmospheres, Stellar Models, Stellar Rotation, Compton Effect, Gamma Rays, Space-Time Functions, Stellar Mass Accretion
Scientific paper
A general formalism is developed for calculating energies of particles which escape to infinity after a collision in black-hole ergospheres. A few examples, in particular Compton scattering, are discussed. For the latter, some model numerical calculations are presented which demonstrate the conversion of infalling low-energy photons into soft gamma rays by equatorial plasma rings in black-hole ergospheres. The main conclusion to be drawn is that Compton-Penrose processes in black-hole ergospheres could produce characteristic soft gamma rays, whose spectrum is strongly governed by the electron mass and rather weakly controlled by other parameters. Such Penrose processes seem to be quite unique to black holes, and further thought might be given to their possible realizations in astrophysics. The processes are only effective in rapidly rotating black holes.
Piran Tsvi
Shaham Jacob
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