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Title: The beaming pattern of external Compton emission from relativistic outflows: The case of anisotropic distribution of electrons

The beaming pattern of radiation emitted by a relativistically moving source, such as jets in microquasars, active galactic nuclei, and gamma-ray bursts, is a key issue for understanding acceleration and radiation processes in these objects. In this paper, we introduce a formalism based on a solution of the photon transfer equation to study the beaming patterns for emission produced by electrons accelerated in the jet and the upscattering photons of low-energy radiation fields of external origin (the so-called external Compton scenario). The formalism allows us to treat non-stationary, non-homogeneous, and anisotropic distributions of electrons, but assuming homogeneous/isotropic and non-variable target photon fields. We demonstrate the non-negligible impact of the anisotropy in the electron distribution on angular and spectral characteristics of the EC radiation.
Authors:
; ; ;  [1]
  1. Max-Planck-Institut für Kernphysik, P.O. Box 103980, D-69029 Heidelberg (Germany)
Publication Date:
OSTI Identifier:
22357067
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 785; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCELERATION; ANISOTROPY; COMPTON EFFECT; COSMIC GAMMA BURSTS; DISTRIBUTION; ELECTRONS; EMISSION; EQUATIONS; GALAXIES; GALAXY NUCLEI; GAMMA RADIATION; PHOTONS; QUASARS; RELATIVISTIC RANGE; SCATTERING