Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990azh....67.1165g&link_type=abstract
Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 67, Nov.-Dec. 1990, p. 1165-1173. In Russian.
Astronomy and Astrophysics
Astrophysics
1
Gamma Ray Astronomy, Nuclear Astrophysics, Pulsars, Stellar Mass Accretion, Stellar Radiation, X Ray Binaries, Magnetohydrodynamic Waves, Relativistic Particles, Stellar Magnetic Fields
Scientific paper
Relativistic protons producing ultrahigh energy gamma rays as a result of nuclear collisions ought to be generated in close proximity to the surface of a neutron star due to accretion. The main features of the mechanism in question are a high efficiency of conversion of the gravitational energy of the accreting matter into acceleration energy and a high efficiency of the acceleration itself. It is shown that in accretion to a neutron star with a strong magnetic field a "loss cone" type distribution of accreting protons is formed, which due to instability effectively generates small-scale Alfven and proton cyclotron waves, as well as nonlinear waves (magneto-acoustic and Alfven solitons). The electric field of the moving solitons may accelerate the protons to energies of greater than 10 to the 15th eV. The region of acceleration is not locally isolated, but extends from the Alfven surface to distances of several radii of the neutron star from its surface. New possible sources of ultrahigh energy gamma rays are predicted. They may be binary X-ray systems containing neutron stars with magnetic fields of about 10 to the 9th gauss.
Gnedin Yu N.
Ikhsanov Nazar R.
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