Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....61..659s&link_type=abstract
Astronomy and Astrophysics, vol. 61, no. 5, Dec. 1977, p. 659-669.
Astronomy and Astrophysics
Astrophysics
17
Astrophysics, Black Holes (Astronomy), Pair Production, Photons, Relativistic Plasmas, Stellar Mass Accretion, Black Body Radiation, Bremsstrahlung, Compton Effect, Plancks Constant, Plasmas (Physics), Radiation Spectra, Radio Sources (Astronomy), Steady State, Thermal Instability
Scientific paper
Photon pair-production processes in marginally relativistic (transrelativistic) accretion plasmas are investigated in both Planckian and non-Planckian cases. Pair production in a plasma with an equilibrium (Planck) spectrum is reviewed, and pair-concentration calculations are performed for three general non-Planckian situations most relevant to black-hole accretion scenarios: steady-state transrelativistic plasmas of relatively high density characterized by a pure bremsstrahlung spectrum, a comptonized bremsstrahlung spectrum, and an unsaturated Compton scattering spectrum. The results obtained indicate that for transrelativistic temperatures (600 million to 6 billion K) photon pair production is not generally a dominant process for a plasma with a pure bremsstrahlung spectrum, but becomes dominant for plasmas where comptonization is important. It is also shown that photon pair-creation processes in a transrelativistic bremsstrahlung-radiating plasma that is more than marginally optically thick to Compton scattering significantly alter the plasma's spectrum by forcing it to become black-body before it reaches relativistic temperatures. Pair production and instabilities in unsteady-state plasmas are briefly considered
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