A model for the high-energy power-law component observed in the X-ray spectra of low-mass X-ray binaries

Details A model for the high-energy power-law component observed in the X-ray spectra of low-mass X-ray binaries A model for the high-energy power-law component observed in the X-ray spectra of low-mass X-ray binaries

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...355..585h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 355, June 1, 1990, p. 585-589.

Astronomy and Astrophysics

Astrophysics

12

Accretion Disks, Astronomical Models, X Ray Binaries, X Ray Spectra, Astronomical Spectroscopy, Compton Effect, Radiative Transfer, Stellar Luminosity, Stellar Mass

Scientific paper

According to recent observations, an X-ray spectrum of a low-mass X-ray binary (LMXB) is well approximated by a power-law for E greater than 10 keV when the luminosity is very low. A model is proposed for this high-energy component. In an LMXB, a neutron star accretes gas from its companion through an accretion disk. The gas accreted from the inner edge of the accretion disk has angular momentum and rotates with roughly the Keplerian velocity on the neutron star surface. X-ray photons from the neutron star are scattered in the rapidly rotating surface layer named the boundary layer. The scattered X-ray photons change their energy by the Compton effect. Some of the X-ray photons are scattered repeatedly between the boundary layer and the neutron star and observed as high-energy X-ray photons. The model reproduces the observational feature of the high-energy power-law component. The photon index of the model spectrum is expressed as a function of the model parameters.

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