Statistics – Computation
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...373..222h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 373, May 20, 1991, p. 222-227.
Statistics
Computation
7
Accretion Disks, Neutron Stars, X Ray Scattering, X Ray Sources, Boundary Layer Plasmas, Compton Effect, Computational Astrophysics, Monte Carlo Method, Shear Layers
Scientific paper
It is shown by Monte Carlo simulation that high-energy X-rays are produced through Compton scattering in a boundary layer of an accreting neutron star. The following is the mechanism for the high-energy X-ray production. An accreting neutron star has a boundary layer rotating rapidly on the surface. X-rays radiated from the star's surface are scattered in part in the boundary layer. Since the boundary layer rotates at a semirelativistic speed, the scattered X-ray energy is changed by the Compton effect. Some X-rays are scattered repeatedly between the neutron star and the boundary layer and become high-energy X-rays. This mechanism is a photon analog of the second-order Fermi acceleration of cosmic rays. When the boundary layer is semitransparent, high-energy X-rays are produced efficiently.
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