On the Contribution of "Fresh" Cosmic Rays to the Excesses of Secondary Particles

Abstract

The standard model of cosmic ray propagation has been very successful in explaining all kinds of the Galactic cosmic ray spectra. However, high precision measurement recently revealed the appreciable discrepancy between data and model expectation, from spectrum observations of $\gamma$-rays, $e^{+}/e^{-}$ and probably the $B/C$ ratio starting from $\sim$10 GeV energy. In this work, we propose that the fresh cosmic rays, which are supplied by the young accelerators and detained by local magnetic field, can contribute additional secondary particles interacting with local materials. As this early cosmic ray has a hard spectrum, the model calculation results in a two-component $\gamma$-ray spectrum, which agree very well with the observation. Simultaneously, the expected neutrino number from the galactic plane could contribute $\sim 60\%$ of IceCube observation neutrino number below a few hundreds of TeV. The same pp-collision process can account for a significant amount of the positron excesses. Under this model, it is expected that the excesses in $\overline{p}/p$ and $B/C$ ratio will show up when energy is above $\sim$10 GeV. We look forward that the model will be tested in the near future by new observations from AMS02, IceCube, AS$\gamma$, HAWC and future experiments such as LHASSO, HiSCORE and CTA.

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Cited by in corpus (12)

• Two-zone diffusion of electrons and positrons from Geminga explains the positron anomaly
• Galactic Neutrinos in the TeV to PeV Range
• Understanding the spectral hardenings and radial distribution of Galactic cosmic rays and Fermi diffuse gamma-rays with spatially-dependent propagation
• Constraints on the neutrino emission from the Galactic Ridge with the ANTARES telescope
• Probing decaying heavy dark matter with the 4-year IceCube HESE data
• Boosted Dark Matter and its implications for the features in IceCube HESE data
• Spatial Dependent Diffusion of Cosmic Rays and the Excess of Primary Electrons Derived from High Precision Measurements by AMS-02
• Probing the Cosmic Ray density in the inner Galaxy
• Ultrahigh-energy diffuse gamma-ray emission from cosmic-ray interactions with medium surrounding acceleration sources
• Evidence of fresh cosmic ray in galactic plane based on DAMPE measurement of B/C and B/O ratios
• Origin of hardening in spectra of cosmic ray nuclei at a few hundred GeV using AMS-02 data
• Early Decay of Peccei-Quinn Fermion and the IceCube Neutrino Events