Iron K-shell lines from relativistic accretion disks

Details Iron K-shell lines from relativistic accretion disks Iron K-shell lines from relativistic accretion disks

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296...19s&link_type=abstract

In its The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 1: X Ray Binaries p 19-23 (SEE N90-25711 19-89)

Astronomy and Astrophysics

Astronomy

1

Accretion Disks, Iron, K Lines, Relativistic Plasmas, Stellar Mass Accretion, Emission Spectra, Gravitational Collapse, Red Shift, Stellar Spectra

Scientific paper

Broad Fe K-shell emission lines at approximately 6 to 7 keV are observed in bright accreting galactic X-ray sources. In the case of the black hole candidates Cyg X-1 and 4U1543-47 the line centroid energy indicates a redshift. The observed widths and redshifts are unlikely to arise from Comptonization. The iron K-line profile is most likely dominated by bulk plasma motions in the vicinity of the accreting collapsed object. A relativistic model for the emission-line profile produced by Keplerian disk orbiting a Schwarzschild black hole is presented. The model predictions are in good agreement with the low resolution lines profiles obtained. The accretion disk scenario outlined can be confirmed by higher resolution studies of the Fe K-lines properties; the mass of the central object and the properties of the accretion flow can be determined.

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