The relativistic shift of narrow spectral features from black-hole accretion discs

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dc.creatorPechacek, T.
dc.creatorDovciak, M.
dc.creatorKaras, V.
dc.creatorMatt, G.
dc.date2005-07-08
dc.date.accessioned2026-07-07T06:20:14Z
dc.date.available2026-07-07T06:20:14Z
dc.descriptionTransient spectral features have been discovered in the X-ray spectra of Active Galactic Nuclei, mostly in the 5--7 keV energy range. Several interpretations were proposed for the origin of these features. We examined a model of Doppler boosted blue horns of the iron line originating from a spot in a black hole accretion disc, taking into account different approximations of general relativistic light rays and the resulting shift of energy of photons. We provide a practical formula for the blue horn energy of an intrinsically narrow line and assess its accuracy by comparing the approximation against an exact value, predicted under the assumption of a planar accretion disc. The most accurate approximation provides excellent agreement with the spot orbital radius down to the marginally stable orbit of a non-rotating black hole.
dc.descriptionAccepted for publication in A&A; 8 pages, 5 figures
dc.identifierhttps://arxiv.org/abs/astro-ph/0507196
dc.identifierhttp://arxiv.org/abs/astro-ph/0507196
dc.identifierAstron.Astrophys. 441 (2005) 855-861
dc.identifierdoi:10.1051/0004-6361:20053451
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/95274
dc.subjectAstrophysics
dc.titleThe relativistic shift of narrow spectral features from black-hole accretion discs
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