Format:
ix, 114 Seiten
,
Illustrationen, Diagramme
Content:
Modern gamma-ray telescopes, provide the main stream of data for astrophysicists in quest of detecting the sources of gamma rays such as active galactic nuclei (AGN). Many blazars have been detected with gamma-ray telescopes such as HESS, VERITAS, MAGIC and Fermi satellite as sources of gamma-rays with the energy E ≥ 100 GeV. These very-high-energy photons interact with extragalactic background light (EBL) producing ultra-relativistic electron-positron pairs. Observations with Fermi-LAT indicate that the GeV gamma-ray flux from some blazars is lower than that predicted from the full electromagnetic cascade. The pairs can induce electrostatic and electromagnetic instabilities. In this case, wave-particle interactions can reduce the energy of the pairs. Therefore, the collective plasma effects can also substantially suppress the GeV-band gamma-ray emission affecting as well the IGMF constraints. Using Particle in cell (PIC) simulations, we have revisited the issue of plasma instabilities induced by electron-positron beams in the fully…
Note:
Dissertation Universität Potsdam 2018
Additional Edition:
Erscheint auch als Online-Ausgabe Rafighi, Iman Plasma Instabilities from blazar-induced pair beams propagating through IGM Potsdam, 2018
Language:
English
Keywords:
Plasma
;
Instabilität
;
Blazar
;
Intergalaktische Materie
;
Computersimulation
;
Čerenkov-Strahlung
;
Gammastrahlung
;
Hohe Energie
;
Paarerzeugung
;
Hochschulschrift
Author information:
Pohl, Martin 1965-
Author information:
Pfrommer, Christoph 1975-
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