Ultra-high energy gamma rays and cosmic rays from accreting degenerate stars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Binary Stars, Cosmic Rays, Energetic Particles, Gamma Ray Astronomy, Stellar Mass Accretion, X Ray Sources, Accretion Disks, Cygnus Constellation, Particle Acceleration, Pulsars, Stellar Luminosity

Scientific paper

A model for the acceleration of particles to ultrahigh energies in binary star systems containing accreting magnetized neutron stars is presented. In the model the high-energy particles, which produce gamma rays, are accelerated in an accretion disk surrounding a neutron star by the unipolar inductor mechanism; thus, accretion is the ultimate energy source. It is also argued that the ultrahigh energy gamma rays reported to have been observed from Cyg X-3, Her X-1, and Vela X-1 cannot all be explained by a model where the luminosity is derived from the rotational energy of a neutron star. If the proposed model is correct, many of the known pulsating X-ray sources and magnetized cataclysmic variables should also emit ultrahigh energy gamma rays.

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