PoS - Proceedings of Science
Volume 444 - 38th International Cosmic Ray Conference (ICRC2023) - Cosmic-Ray Physics (Direct, CRD)
Interpretation of multimessenger anomalies of galactic cosmic rays with spatially dependent propagation model
Y. Yao* and X.L.D.Y.Q.G. Qiang Yuan
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Pre-published on: July 25, 2023
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Recent observations of cosmic rays have presented compelling evidence for the presence of a two-component spectra anomaly that is observed across all primary and secondary particles, as well as the connecting ratios within the galactic plane. In this study, we propose a syngenetic origin for this two-component phenomenon, suggesting that it originates from two diffuse regions. With this scenario, we demonstrate that all anomalies, with the exception of the positron spectrum, can be naturally reproduced. Specifically, the break-off in the electron spectrum at TeV energies can be understood as a transition process from a regime where diffusion dominates to one where energy cooling effects become prominent.
Moreover, we find that extending the two-component spectra model to encompass the entire galactic plane enables us to recreate the ultra-high energy emissions detected by the AS$\rm\gamma$ experiment. Consequently, our work establishes a clear physical framework for understanding the formation of galactic cosmic rays. Notably, the high-energy cosmic rays primarily originate from recent accelerators and remain confined to nearby locations, while the low-energy cosmic rays predominantly originate from remote sources within the galactic sea. In other words, cosmic rays below 200 GV stem from the galactic sea, whereas those above 200 GV, including those located at the knee position, primarily originate from sources in close proximity to us.
DOI: https://doi.org/10.22323/1.444.0158
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