On the stability of electron-positron pair equilibria and the X-ray variability of active galactic nuclei

Details On the stability of electron-positron pair equilibria and the X-ray variability of active galactic nuclei On the stability of electron-positron pair equilibria and the X-ray variability of active galactic nuclei

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.249..177b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 249, March 1, 1991, p. 177-183. Research supported by I

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Active Galactic Nuclei, Electron-Positron Pairs, Magnetohydrodynamic Stability, Nuclear Astrophysics, X Ray Sources, Computational Astrophysics, Cosmic Plasma, Coulomb Collisions

Scientific paper

A detailed linear stability analysis of pair equilibria in homogeneous static two-temperature plasma clouds is reported, considering the case in which electrons and positrons are heated in Coulomb interactions with hot protons, and are cooled by bremsstrahlung, annihilation, and Compton scattering. The treatment is kept analytical, except for a numerical evaluation of the eigenvalues of the stability matrix. Including energy conservation for both pairs and protons has a stabilizing effect on the equilibria causing the unstable region in parameter space to decrease by a factor of 2. The pair equilibria are unstable only when the compactness of the plasma cloud is in the limited range from 10 to 25, and the proton optical depth is less than 2. This pair instability is therefore not likely to be the major cause for the observed X-ray time variability in active galactic nuclei.

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