Superdiffusion of cosmic rays in the vicinity of their accelerators and the resulting γ-ray emission

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ID: 320951
2026
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Abstract
Abstract We study the distribution of cosmic rays (CRs) in the vicinity of their accelerators, assuming that the transport of CRs in the interstellar medium surrounding the accelerators is described by the superdiffusion, beyond the normal diffusion. We find that the superdiffusivity, which is characterized by the superdiffusion parameter α, impacts significantly the distribution of CRs. For impulsive injection, the CR distribution behaves a constant radial profile, except with a power-law tail for α < 2 or a Gaussian tail for α = 2 at large distance, r, from the accelerators. For stationary injection, the radial profile of CR protons tends to being proportional to rα − 3, while that of CR electrons can deviate from the rα − 3 profile, due to their severe energy losses. We also compute the γ-ray emission, produced by the interactions of CRs with ambient gas and radiation fields, within 100 pc regions around the accelerators. We find that by investigating the γ-ray morphology, we can distinguish the superdiffusion from the normal diffusion with present and next-generation imaging air Cherenkov telescopes.
Reference Key
openalex_W7168271062 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Zhaodong Shi, Guangwei Wang, Rui-zhi Yang
Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1326
URL
https://doi.org/10.1093/mnras/stag1326
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