27-31 August 2018
LVH, Luisenstraße 58, 10117 Berlin
Europe/Berlin timezone
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Contribution Talk

-1- Lecture hall
Galactic

3D MHD simulations of particle acceleration in Gamma Velorum, Eta Carinae, WR 147, and HD 93129A

Speakers

  • Dr. Klaus REITBERGER

Primary authors

  • Dr. Klaus REITBERGER (Zentrum für Astronomie,Universität Heidelberg AND Institut für Astro- und Teilchenphysik, Universität Innsbruck)

Co-authors

  • Dr. Ralf KISSMANN (Institut für Astro- und Teilchenphysik, Universität Innsbruck)
  • Dr. Olaf REIMER (Institut für Astro- und Teilchenphysik, Universität Innsbruck)
  • Dr. Anita REIMER (Institut für Theoretische Physik, Universität Innsbruck, Austria)

Abstract content

In the light of new data regarding the high-energy $\gamma$-ray emission of suspected massive star colliding-wind binary systems, magneto-hydrodynamic simulations can now be refined and adapted in order to provide explanation of past and prediction of future emission characteristics of these sources.

We use three-dimensional magneto-hydrodynamic modeling to investigate the structure and conditions of the wind-collision region (WCR) of colliding-wind binary systems including the important effect of radiative braking in the stellar winds. A transport equation is then solved throughout the computational domain to study the propagation of relativistic electrons and protons with energies up to the GeV and TeV range. The resulting distributions of particles are subsequently used to compute nonthermal photon emission components.

Relying on a choice of physical parameters (as diffusion coefficient normalization and particle injection rate) that has been inspired by the recent modeling of $\gamma^2$Velorum (WR 11), we make use of known stellar and stellar wind parameters to simulate the non-thermal photon emission of the systems of $\eta$ Carinae, WR 147, and HD 93129A. From the simulated spectra, we make predictions on their future detectability or - if already detected - about their variability pattern in high-energy $\gamma$-rays.