Comptonized Fe K-lines in the X-ray spectra of Low-Mass X-ray Binaries

Details Comptonized Fe K-lines in the X-ray spectra of Low-Mass X-ray Binaries Comptonized Fe K-lines in the X-ray spectra of Low-Mass X-ray Binaries

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1171..363g&link_type=abstract

RECENT DIRECTIONS IN ASTROPHYSICAL QUANTITATIVE SPECTROSCOPY AND RADIATION HYDRODYNAMICS: Proceedings of the International Confe

Astronomy and Astrophysics

Astrophysics

Accretion Disks, Heat Transfer, X-Ray Binary Stars, Accretion And Accretion Disks, Analytical And Numerical Techniques, X-Ray Binaries

Scientific paper

We present new models for the vertical structure of accretion disks illuminated by X-rays. The chief advance is the inclusion of the most recent atomic data for the inner-shell of the iron isonuclear sequence. We also include the redistribution of the photons due to Compton scattering. By performing detailed 1D radiative transfer calculations, we have computed the reflected spectra from constant density slabs for different degrees of ionization. Our results show that Comptonization can be responsible for a significant fraction of the broadening of the Fe K-line. This is of interest in view of recent observations which have revealed broad and asymmetric iron emission line profiles in some neutron star Low Mass X-Ray Binaries (LMXBs). Although these resemble the broadened lines observed in some active galactic nuclei, and which are likely due to the Doppler effect and gravitational redshift, we examine the contribution to the Fe K-line broadening by Comptonization in a disk atmosphere. Using simulated Suzaku observations, we compare ourmodels with the current observations.

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