Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esasp.207..209t&link_type=abstract
In ESA Plasma Astrophys. p 209-212 (SEE N85-22270 12-90)
Astronomy and Astrophysics
Astronomy
1
Active Galactic Nuclei, Electron-Positron Pairs, Electron-Positron Plasmas, High Temperature Plasmas, Pair Production, Relativistic Plasmas, Black Holes (Astronomy), Cyclotron Radiation, Electron Density (Concentration), Electron Radiation, Photons, Stellar Mass Accretion
Scientific paper
The electron-positron pair concentration in an optically thin mildly relativistic plasma is investigated. The equilibrium pair concentration is calculated when copious soft photons are supplied by the cyclotron higher harmonics. It is shown that the attainable states of a plasma are strongly restricted by the pair equilibrium condition. Pair production in the hot plasma produced by accretion onto a supermassive black hole is investigated, comparing relevant time scales. It is shown that the plasma becomes pair dominated if the accretion rate is moderately high and accretion flow is slow compared to free fall. The unsaturated Comptonization leads to the formation of a pair dominated plasma in most cases.
Kusunose Masaaki
Takahara Fumio
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