NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-23 T17:56:12 PDT
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For refcode 2000MNRAS.315..223R:
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Copyright by Royal Astronomical Society. 2000MNRAS.315..223R On the influence of resonant absorption on the iron emission line profiles from accreting black holes Mateusz Ruszkowski and Andrew C. Fabian Accepted 1999 November 24. Received 1999 November 22; in original form 1999 September 21 ABSTRACT The fluorescent iron K{alpha} emission-line profile provides an excellent probe of the innermost regions of active galactic nuclei. Fe XXV and Fe XXVI in diffuse plasma above the accretion disc can affect the X-ray spectrum by iron K{alpha} resonant absorption. This in turn can influence the interpretation of the data and the estimation of the accretion disc and black hole parameters. We embark on a fully relativistic computation of this effect and calculate the iron line profile in the framework of a specific model in which rotating, highly ionized and resonantly absorbing plasma occurs close to the black hole. This can explain the features seen in the iron K{alpha} line profile recently obtained by Nandra et al. for the type 1 Seyfert galaxy NGC 3516. We show that the redshift of this feature can be mainly gravitational in origin and accounted for without the need to invoke fast accretion of matter on to the black hole. New X-ray satellites such as XMM, ASTRO-E and Chandra provide excellent opportunities to test the model against high-quality observational data. Keywords: accretion, accretion discs - black hole physics - line: formation - galaxies: active - galaxies: Seyfert - X-rays: galaxies
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