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2001MNRAS.328..616D - Mon. Not. R. Astron. Soc., 328, 616-622 (2001/December-1)

Testing models of X-ray reflection from irradiated discs.

DONE C. and NAYAKSHIN S.

Abstract (from CDS):

We model the reflected spectrum expected from localized magnetic flares above an ionized accretion disc. We concentrate on the case of very luminous magnetic flares above a standard accretion disc extending down to the last stable orbit, and use a simple parametrization to allow for an X-ray-driven wind. Full disc spectra including relativistic smearing are calculated. When fitted with the constant-density reflection models, these spectra give both a low reflected fraction and a small linewidth as seen in the hard spectra from galactic black hole binaries and active galactic nuclei. We fit our calculated spectra to real data from the low/hard state of Nova Muscae and Cyg X-1 and show that these models give comparable χ2 to those obtained from the constant-density reflection models, which implied a truncated disc. This explicitly demonstrates that the data are consistent either with magnetic flares above an ionized disc extending down to the last stable orbit around a black hole, or with non-ionized, truncated discs.

Abstract Copyright: The Royal Astronomical Society

Journal keyword(s): accretion, accretion discs - line: formation - radiation mechanisms: non-thermal - radiative transfer - X-rays: general

Simbad objects: 2

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