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Model of Cosmic Ray Propagation in the Milky Way at the Knee

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arxiv 2305.10251 v1 pith:EIPVPFLZ submitted 2023-05-17 astro-ph.HE

G. Giacinti , D. Semikoz This is my paper · ORCID
classification astro-ph.HE
keywords cosmicmodelraysdistributiongalacticgalaxykneemilky
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abstract

We present a new model of anisotropic cosmic ray propagation in the Milky Way, where cosmic rays are injected at discrete transient sources in the disc and propagated in the Galactic magnetic field. In the framework of our model, we show that the cosmic ray spectrum is time-dependent and space-dependent around the energy of the knee. It has a major contribution of one or a few nearby recent sources at any given location in the Galaxy, in particular at the position of the Solar system. We find that the distribution of $\sim$ PeV cosmic rays in our Galaxy is significantly clumpy and inhomogeneous, and therefore substantially different from the smoother distribution of GeV cosmic rays. Our findings have important implications for the calculation and future interpretation of the diffuse Galactic gamma-ray and neutrino fluxes at very high energies.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Potential Contribution of Young Pulsar Wind Nebulae to Galactic High-Energy Neutrino Emission

    astro-ph.HE 2025-01 conditional novelty 6.0 of 10

    A Crab-like synthetic population of young pulsar wind nebulae can contribute roughly 5% of the IceCube Galactic neutrino flux near 100 TeV in an optimistic hadronic-proton model.

  2. Diffuse gamma-ray and neutrino emission from the Milky Way and the local knee in the cosmic ray spectrum

    astro-ph.HE 2025-07 conditional novelty 5.0 of 10

    Diffuse gamma-ray predictions from locally measured cosmic rays exceed LHAASO observations above 100 TeV, suggesting the PeV cosmic-ray knee originates from a local bubble roughly 0.7 to 1.5 kpc across.

  3. Leptonic and hadronic models of high-energy nebula around V4641 Sgr

    astro-ph.HE 2025-12 conditional novelty 4.0 of 10

    Protons produce the >100 TeV gamma-ray halo of V4641 Sgr while freshly accelerated electrons produce its X-rays, a mixed leptohadronic model that matches the observed spectrum and morphology.

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