Journal Article

PUBDB-2016-00415

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Particle diffusion and localized acceleration in inhomogeneous AGN jets - I. Steady-state spectra

Chen, X. (Corresponding author)DESY* ; Pohl, M.DESY* ; Bottcher, M.

2015
Oxford Univ. Press Oxford

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Please use a persistent id in citations: doi:10.1093/mnras/stu2438  doi:10.3204/PUBDB-2016-00415

Report No.: arXiv:1411.4518

Abstract: We study the acceleration, transport, and emission of particles in relativistic jets. Localized stochastic particle acceleration, spatial diffusion, and synchrotron as well as synchrotron self-Compton (SSC) emission are considered in a leptonic model. To account for inhomogeneity, we use a 2D axisymmetric cylindrical geometry for both relativistic electrons and magnetic field. In this first phase of our work, we focus on steady-state spectra that develop from a time-dependent model. We demonstrate that small isolated acceleration region in a much larger emission volume are sufficient to accelerate particles to high energy. Diffusive escape from these small regions provides a natural explanation for the spectral form of the jet emission. The location of the acceleration regions within the jet is found to affect the cooling break of the spectrum in this diffusive model. Diffusion-caused energy-dependent inhomogeneity in the jets predicts that the SSC spectrum is harder than the synchrotron spectrum. There can also be a spectral hardening towards the high-energy section of the synchrotron spectrum, if particle escape is relatively slow. These two spectral hardening effects indicate that the jet inhomogeneity might be a natural explanation for the unexpected hard γ-ray spectra observed in some blazars.

Note: (c) The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

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Contributing Institute(s):

1. Theoretische Astroteilchenphysik (Z_THAT)

Research Program(s):

1. 523 - High-energy gamma ray astronomy (POF2-523) (POF2-523)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2015

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Database coverage:
; ; Current Contents - Physical, Chemical and Earth Sciences ; Free to read ; IF >= 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Preprint/Internal Report Chen, X. (Corresponding Author)DESY* ; Pohl, M.DESY* ; Boettcher, M.
Particle diffusion and localized acceleration in inhomogeneous AGN jets - Part I: Steady-state spectra
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