Relativistic positron stream in the electric field generated by radiation pressure

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Plasma Acceleration, Positrons, Radiation Pressure, Relativistic Particles, Space Plasmas, Accretion Disks, Astronomical Models, Electric Fields, Nonuniform Plasmas, Particle Acceleration, Positron Annihilation, Quasars, Supernova Remnants

Scientific paper

Radiation driven relativistic particle streams can be produced by a very luminous source via two related mechanisms: the acceleration of a plasma as a whole by radiation pressure and the acceleration of positrons through a free plasma by radiation pressure and the electric field generated by radiation in the plasma. The second mechanism yields much larger particle energies than the first one. The asymptotic analytic solutions of the equations of motion for both mechanisms are found for the acceleration along the axis of an axisymmetric radiation source in two configurations: an arbitrary single source of finite size and an infinite, thin, Keplerian accretion disk. These solutions provide a simple method for estimating the effectiveness of possible radiation sources as particle accelerators for both mechanisms. This method is applied to the Jaroszinski model of a thick accretion disk. A simple model of an ultrarelativistic positron stream illustrates the possibility for such a stream to be stable.

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