The influence of resonant absorption on the Fe emission line profiles from accreting black holes

Physics

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Galactic Nuclei, Circumnuclear Matter, And Bulges, Physics Of Black Holes, Active And Peculiar Galaxies And Related Systems, X-Ray Sources, X-Ray Bursts

Scientific paper

Diffuse plasma existing above an accretion disc can affect the X-ray spectrum by iron Kα resonance absorption. This in turn can influence 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 Kα line profile recently obtained by Nandra et al.(1999) for the Seyfert 1 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 the matter onto 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. .

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