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

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 ($\text{>200 GV}$, including the knee) particles are primarily produced by fresh accelerators and are confined to local regions, low energy ($\text{<200 GV}$) 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 $\gamma$-ray emissions detected by the AS$\gamma$ experiment. Furthermore, our results predict that the spectrum of diffuse $\gamma$-ray is spatial-dependent, resting with local sources, which can be tested by LHAASO experiment.

9 pages, 7 figures, accepted by PhysRevD

References in corpus (12)

• Direct detection of a break in the teraelectronvolt cosmic-ray spectrum of electrons and positrons
• Extended gamma-ray sources around pulsars constrain the origin of the positron flux at Earth
• Cosmic-Ray Proton and Helium Spectra from the First CREAM Flight
• Measurement of the cosmic-ray proton spectrum from 40 GeV to 100 TeV with the DAMPE satellite
• Origin of the Cosmic Ray Spectral Hardening
• Extended Very-High-Energy Gamma-Ray Emission Surrounding PSR J0622 + 3749 Observed by LHAASO-KM2A
• Gamma-ray sky points to radial gradients in cosmic-ray transport
• Measurement of ultra-high-energy diffuse gamma-ray emission of the Galactic plane from 10 TeV to 1 PeV with LHAASO-KM2A
• Detection of spectral hardenings in cosmic-ray boron-to-carbon and boron-to-oxygen flux ratios with DAMPE
• The origin of cosmic rays: Explosions of massive stars with magnetic winds and their supernova mechanism
• GeV-TeV cosmic-ray spectral anomaly as due to re-acceleration by weak shocks in the Galaxy
• Gamma-ray halos around pulsars as the key to understanding cosmic ray transport in the Galaxy

Cited by in corpus (2)

• Measurement of Very-high-energy Diffuse Gamma-ray Emissions from the Galactic Plane with LHAASO-WCDA
• X-ray Binaries: a potential dominant contributor to the cosmic ray spectral knee structure