Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...384..136m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 384, Jan. 1, 1992, p. 136-142.
Astronomy and Astrophysics
Astrophysics
14
Accretion Disks, Compton Effect, Neutron Stars, Stellar Mass Accretion, Fluid Flow, Light Scattering, Radiative Transfer
Scientific paper
Compton scattering of low-frequency photons in a converging flow of cold plasma is studied. The equation of radiative transfer in the case of spherical near-critical steady state accretion onto a neutron star is solved analytically. The inner boundary condition is that the neutron star surface is completely reflective, or that there is a magnetopause with an empty cavity inside it. The photons escape diffusively and electron scattering is the dominant source of opacity. The energy gain of the photon comes entirely from the bulk motion of the converging flow of the accreting gas. The spectrum observed at infinity is a power law at high frequencies with photon number spectral index essentially -1. This spectrum is significantly flatter than that found for accretion into black holes.
Kylafis Nikolaos D.
Mastichiadis Apostolos
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