Cosmic Rays in Superbubbles

Abstract : A solution of the transport equation for cosmic rays in turbulent magnetic fields in a spherically symmetric geometry is presented. The results are applied to particle propagation in superbubbles. In the fully analytical calculation, various energy-loss processes are considered. From the distribution function of the cosmic-ray particles, the distribution for pions from continuous losses is computed. Folding with the appropriate cross section yields the gamma-ray distribution. It is shown that in the case of efficient acceleration the volume-integrated π 0-decay gamma-ray emission from the superbubble exhibits the characteristic hard differential number density spectrum at large gamma-ray energies, E γ  ≫ 70 MeV. This prediction is useful for identifying efficient superbubble cosmic-ray accelerators from gamma-ray observations.
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Submitted on : Thursday, August 1, 2019 - 2:15:50 AM
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T. Tolksdorf, I.A. Grenier, T. Joubaud, R. Schlickeiser. Cosmic Rays in Superbubbles. Astrophys.J., 2019, 879 (2), pp.66. ⟨10.3847/1538-4357/ab24c6⟩. ⟨hal-02223028⟩



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