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ID: 10047.0, MPI für Astrophysik / High Energy Astrophysics at MPA
Testing models of X-ray reflection from irradiated discs
Authors:Done, C.; Nayakshin, S.
Language:English
Date of Publication (YYYY-MM-DD):2002
Title of Journal:Monthly Notices of the Royal Astronomical Society
Journal Abbrev.:Mon. Not. Roy. Astron. Soc.
Volume:328
Issue / Number:2
Start Page:616
End Page:622
Review Status:Peer-review
Audience:Experts Only
Abstract / Description: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 chi (2) 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.
Free Keywords:accretion; accretion discs; line : formation; radiation mechanisms : non-thermal; radiative transfer; X-rays : general
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astrophysik
Identifiers:ISI:000172925500024
ISSN:0035-8711
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