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MODELISATIONS DE L'EMISSION NON-THERMIQUE DES BLAZARS DU TeV PAR UNE DISTRIBUTION RELATIVISTE QUASI-MAXWELLIENNE

Abstract : The understanding of the emission and variability mechanisms of the TeV emitter Blazars still remains an open question among the high-energy astrophysics community. The extreme radiation arising from these objects allows us, on one hand to investigate the compact region closest to the central black hole and on in other hand to constrain acceleration mechanism of the emitting particles. We consider here the energy distribution function (EDF) of these particles as a relativistic quasi-maxwellian one. This kind of EDF is fully justified in the framework of the stochastic acceleration process, ensured here by plasma/MHD waves interaction. We describe in this work two different models using the particular pileup EDF ; the first one assumes a spherical emission zone (homogeneous approach or one-zone model), whereas in the secondone the emission is supposed to be produced by a stratified jet (inhomogeneous model). This latter approach is done under the « two-flow paradigm » framework. In both cases, in order to explain the complex temporal radiative behavior, the modeling is time dependent and supposes that the pair production process by gamma-gamma interaction plays a fundamental role. We also take into account the high-energy signal attenuation by the photons arising from the cosmic infrared background (CIB) radiation field. We also describe how we can put severe constrains on the jet dynamics using simple statistical arguments. Moreover we demonstrate why the homogeneous modeling does not explain satisfactorily the value of the bulk motion velocity although it remarkably describes the spectral features of the sources.
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https://tel.archives-ouvertes.fr/tel-00008905
Contributor : Ludovic Saugé <>
Submitted on : Wednesday, March 30, 2005 - 11:26:24 AM
Last modification on : Friday, November 6, 2020 - 4:11:19 AM
Long-term archiving on: : Friday, April 2, 2010 - 9:37:18 PM

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  • HAL Id : tel-00008905, version 1

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Ludovic Saugé. MODELISATIONS DE L'EMISSION NON-THERMIQUE DES BLAZARS DU TeV PAR UNE DISTRIBUTION RELATIVISTE QUASI-MAXWELLIENNE. Astrophysique [astro-ph]. Université Joseph-Fourier - Grenoble I, 2004. Français. ⟨tel-00008905⟩

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