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SIMULATING THREE-DIMENSIONAL NONTHERMAL HIGH-ENERGY PHOTON EMISSION IN COLLIDING-WIND BINARIES

Reitberger, K ; Kissmann, R ; Reimer, A ; Reimer, O

The Astrophysical journal, 2014-07, Vol.789 (1), p.1-19 [Periódico revisado por pares]

United States

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  • Título:
    SIMULATING THREE-DIMENSIONAL NONTHERMAL HIGH-ENERGY PHOTON EMISSION IN COLLIDING-WIND BINARIES
  • Autor: Reitberger, K ; Kissmann, R ; Reimer, A ; Reimer, O
  • Assuntos: ANISOTROPY ; ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ; BREMSSTRAHLUNG ; COLLISIONS ; Computation ; DISTRIBUTION FUNCTIONS ; Emission ; ENERGY SPECTRA ; GAMMA RADIATION ; HYDRODYNAMICS ; Mathematical models ; OPACITY ; Orbitals ; PHOTON EMISSION ; Photons ; PLASMA DENSITY ; PROTONS ; RELATIVISTIC RANGE ; SIMULATION ; STELLAR WINDS ; Three dimensional ; THREE-DIMENSIONAL CALCULATIONS ; TWO-DIMENSIONAL CALCULATIONS ; WOLF-RAYET STARS
  • É parte de: The Astrophysical journal, 2014-07, Vol.789 (1), p.1-19
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: Massive stars in binary systems have long been regarded as potential sources of high-energy gamma rays. The emission is principally thought to arise in the region where the stellar winds collide and accelerate relativistic particles which subsequently emit gamma rays. On the basis of a three-dimensional distribution function of high-energy particles in the wind collision region-as obtained by a numerical hydrodynamics and particle transport model-we present the computation of the three-dimensional nonthermal photon emission for a given line of sight. Anisotropic inverse Compton emission is modeled using the target radiation field of both stars. Photons from relativistic bremsstrahlung and neutial pion decay are computed on the basis of local wind plasma densities. We also consider photon-photon opacity effects due to the dense radiation fields of the stars. Results are shown for different stellar separations of a given binary system comprising of a B star and a Wolf-Rayet star. The influence of orbital orientation with respect to the line of sight is also studied by using different orbital viewing angles. For the chosen electron-proton injection ratio of 10 super(-2), we present the ensuing photon emission in terms of two-dimensional projections maps, spectral energy distributions, and integrated photon flux values in various energy bands. Here, we find a transition from hadron-dominated to lepton-dominated high-energy emission with increasing stellar separations. In addition, we confirm findings from previous analytic modeling that the spectral energy distribution varies significantly with orbital orientation.
  • Editor: United States
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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