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

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

2005-07-08

arxiv.org/abs/astro-ph/0507196v1

Astron.Astrophys. 441 (2005) 855-861

Astronomy and Astrophysics

Astrophysics

Accepted for publication in A&A; 8 pages, 5 figures

Scientific paper

10.1051/0004-6361:20053451

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.

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