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On the stochastic nature of Galactic cosmic-ray sources

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arxiv 2111.01171 v2 pith:RP5YKVMR submitted 2021-11-01 astro-ph.HE

Carmelo Evoli , Elena Amato , Pasquale Blasi , Roberto Aloisio This is my paper · ORCID
classification astro-ph.HE
keywords spectradampenucleiams-02breakcaletcosmicelectrons
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abstract

The precision measurements of the spectra of cosmic ray nuclei and leptons in recent years have revealed the existence of multiple features, such as the spectral break at $\sim 300$ GV rigidity seen by PAMELA and AMS-02 and more recently confirmed by DAMPE and CALET, the softening in the spectra of H and He nuclei at $\sim 10$ TV reported by DAMPE, confirming previous hints by NUCLEON and CREAM, a tiny change of slope at $\sim 40$ GeV in the electron spectrum, revealed by AMS-02, and the large spectral break at $\sim$ TeV reported by indirect (HESS, MAGIC and VERITAS) and direct (DAMPE, CALET) measurements of the total (electrons+positrons) lepton spectrum. In all these cases, the possibility has been suggested that these features might reflect the occasional presence of a local cosmic ray source, inducing a noticeable reshaping of the average expected spectra. All these proposals have to face the question of how likely it is for such a source to exist, a question that we address here in a quantitative way. We study the statistical properties of random distribution of sources in space and time, and the effect of the spiral structure of our Galaxy for both the spectra of light nuclei (p and He) and leptons (electrons and positrons) in different energy regions.

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Cited by 2 Pith papers

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

  1. SECRET: Stochasticity Emulator for Cosmic Ray Electrons

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

    SECRET, a MADE-based conditional density emulator, reproduces and interpolates the joint distribution of stochastic cosmic-ray electron spectra across five transport parameters with few-percent quantile accuracy over ...

  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.

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