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The relativistic shift of narrow spectral features from black-hole accretion discs | | T. Pechacek
; M. Dovciak
; V. Karas
; G. Matt
; | | Date: |
8 Jul 2005 | | Journal: | Astron.Astrophys. 441 (2005) 855-861 DOI: 10.1051/0004-6361:20053451 | | Subject: | astro-ph | | Abstract: | Transient 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. | | Source: | arXiv, astro-ph/0507196 | | Services: | Forum | Review | PDF | Favorites | |
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