Radiative transport through an inhomogeneous accretion column

Astronomy and Astrophysics – Astronomy

Scientific paper

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Computerized Simulation, Monte Carlo Method, Neutron Stars, Phonons, Radiative Transfer, Astronomical Models, Computer Programs, Magnetic Fields, Mathematical Models, Velocity Measurement

Scientific paper

The transport of X-radiation through the lower few kilometers of the accretion column of a highly magnetized neutron star is simulated using a Monte Carlo photon-transport simulation scheme. The code can take into account the spatial variation of strength and direction of the magnetic field, gravitational redshift and deflection of the photon and its path in the Schwarzschildmetric of a neutronstar with given mass. It can model arbitrary distributions of the parameters of the falling plasma: electron bulkvelocity, density, and temperature. The photonfrequency and wave vector are dopplershifted into the restframes of the accreted plasma, the scattering or absorbing electron, or the distant observer.

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