Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-08-25
Mon.Not.Roy.Astron.Soc.317:880,2000
Astronomy and Astrophysics
Astrophysics
15 pages, LaTeX + eps files + 6 separate gif files, Submitted to MNRAS
Scientific paper
10.1046/j.1365-8711.2000.03661.x
Flourescent iron line profiles currently provide the best diagnostic for active galactic nuclei (AGN) engine geometries. Here we construct a method for calculating the relativistic iron line profile from an arbitrarily warped accretion disc, illuminated from above and below by hard X-ray sources. This substantially generalises previous calculations of reprocessing by accretion discs by including non-axisymmetric effects. We include a relativistic treatment of shadowing by ray-tracing photon paths along Schwarzchild geodesics. We apply this method to two classes of warped discs, and generate a selection of resulting line profiles. New profile features include the possibility of sharper red, and softer blue fall-offs, a time varying line profile if the warp precesses about the disc, and some differences between `twisted' and `twist-free' warps. We discuss some qualitative implications of the line profiles in the context of Type I and II Seyfert AGN.
Blackman Eric G.
Hartnoll Sean A.
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