X-ray spectra of accretion discs with dynamic coronae

Details X-ray spectra of accretion discs with dynamic coronae X-ray spectra of accretion discs with dynamic coronae

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.459..325m&link_type=abstract

In: Exploring the gamma-ray universe. Proceedings of the Fourth INTEGRAL Workshop, 4-8 September 2000, Alicante, Spain. Editor:

Computer Science

Accretion, Accretion Discs, Radiative Transfer, Gamma-Rays: Theory, Binaries, Seyfert Galaxies, X-Rays: General

Scientific paper

We compute X-ray spectra produced by non-static coronae atop accretion discs around black holes. The hot corona is radiatively coupled to the underlying disc (the reflector) and generates an X-ray spectrum which is sensitive to the bulk velocity of the coronal plasma, β = v/c. We show that an outflowing corona atop a neutral reflector reproduces the hard-state spectrum of Cyg X-1 and similar objects. The dynamic model predicts a correlation between the observed amplitude of reflection R and the X-ray spectrum slope Γ since both strongly depend on β. A similar correlation was observed and its shape is well fitted by the dynamic model.

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