Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ap%26ss.121..193w&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 121, no. 1, April 1986, p. 193-200. DFG-supported research.
Astronomy and Astrophysics
Astrophysics
5
Gamma Rays, Neutron Stars, Stellar Mass Accretion, Earth Magnetosphere, Magnetohydrodynamic Stability, Particle Acceleration, Particle Collisions
Scientific paper
Several well-known binary X-ray sources have been reported to emit copious γ-radiation at energies up to and exceeding 1015eV. It is proposed here that the observed events occur during episodes of non-steady accretion onto neutron stars, when MHD instabilities give rise to vortex motions on very large scales deep inside the magnetosphere. The magnetic lines of force are strongly distorted and reconnect in neutral sheets, along which extremely high voltage drops are maintained and a small fraction of the particles are accelerated to ultra-relativistic energies. The γ-rays are produced in nuclear collisions undergone by runaway ions traversing regions of high-density, diamagnetic plasma in the accretion flow.
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