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Effets relativistes sur l'émission haute énergie des trous noirs

Abstract : Many recent observations show the existence of the relativistic effects in the black hole radiation (broad iron line, variability).I present the numerical tools for consistent calculations of the relativistic effects (gravitational shift, light bending effect) in the X and gamma rays radiation process around the black holes. These calculations based on Monte-Carlo methods allow to take the angular dependence of the source emission into account. Optimization methods are also presented because the calculation time can become considerably important. These numerical tools are applied to study the behavior of photons and leptons in the Kerr geometry, the influence of the source's position relative to the black hole centre and of the emission angle, as well as the observational effects on the emission of the disc located in the equatorial plane. The study uses an axisymmetric model consisting of a ring-like X-rays source above an accretion disc around a rotating black hole. The observed spectra are the superposition of the primary component directly from the source and the reflection component from the disc. The shape, the normalization, and the angular dependence of both components are investigated by varying the source radius and the distance between the source and the disc. The general relativistic effects are illustrated by a comparison with Newtonian and Special Relativity calculations. The multiple reflections are taken into account for the reflected photons returning to the disc by the light bending effects and their influence quantified. Finally, in order to compare our results with the observations, we investigated the relation between the primary component and the reflection component predicted by the model when the source position varies. The obtained results can reproduce the relation established from the observed data from NGC 4051, and give information on the variation of the source position. I have demonstrated that the relativistic effects are very important in the regions close to black holes and can not be neglected in the high energy emission spectra. I show as well how the relevant numerical tools (including optimization methods) can be integrated in numerical radiative transfer calculations.
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Submitted on : Wednesday, November 22, 2006 - 5:52:11 PM
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  • HAL Id : tel-00115726, version 1

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Thitiwat Suebsuwong. Effets relativistes sur l'émission haute énergie des trous noirs. Astrophysique [astro-ph]. Université Paul Sabatier - Toulouse III, 2006. Français. ⟨tel-00115726⟩

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