English

A common origin of multi-messenger spectral anomaly of galactic cosmic rays

High Energy Astrophysical Phenomena 2024-03-08 v2

Abstract

Recent observations of cosmic rays (CRs) have revealed a two-component anomaly in the spectra of primary and secondary particles, as well as their ratios, prompting investigation into their common origin. In this study, we incorporate the identification of slow diffusion zones around sources as a common phenomenon into our calculations, which successfully reproduces all previously described anomalies except for the positron spectrum. Crucially, our research offers a clear physical picture of the origin of CR: while high-energy (>200 GV\textrm{>200~GV}, including the knee) particles are primarily produced by fresh accelerators and are confined to local regions, low energy (<200 GV\textrm{<200~GV}) components come from distant sources and travel through the outer diffusive zone outside of the galactic disk. This scenario can be universally applied in the galactic disk, as evidenced by ultra-high energy diffuse γ\rm\gamma-ray emissions detected by the ASγ\rm\gamma experiment. Furthermore, our results predict that the spectrum of diffuse γ\rm\gamma-ray is spatial-dependent, resting with local sources, which can be tested by LHAASO experiment.

Keywords

Cite

@article{arxiv.2308.15866,
  title  = {A common origin of multi-messenger spectral anomaly of galactic cosmic rays},
  author = {Yu-Hua Yao and Xu-Lin Dong and Yi-Qing Guo and Qiang Yuan},
  journal= {arXiv preprint arXiv:2308.15866},
  year   = {2024}
}

Comments

9 pages, 7 figures, accepted by PhysRevD