Revisiting the hardening of the cosmic-ray energy spectrum at TeV energies

Abstract

Measurements of cosmic rays by experiments such as ATIC, CREAM, and PAMELA indicate a hardening of the cosmic-ray energy spectrum at TeV energies. In our recent work (Thoudam & Hörandel 2012a), we showed that the hardening can be due to the effect of nearby supernova remnants. We showed it for the case of proton and helium. In this paper, we present an improved and detailed version of our previous work, and extend our study to heavier cosmic-ray species such as boron, carbon, oxygen, and iron nuclei. Unlike our previous study, the present work involves a detailed calculation of the background cosmic rays and follows a consistent treatment of cosmic-ray source parameters between the background and the nearby components. Moreover, we also present a detailed comparison of our results on the secondary-to-primary ratios, secondary spectra, and the diffuse gamma-ray spectrum with the results expected from other existing models, which can be checked by future measurements at high energies.

MNRAS accepted

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Cited by in corpus (21)

• The Origin of Galactic Cosmic Rays
• The gamma-ray and neutrino sky: A consistent picture of Fermi-LAT, Milagro, and IceCube results
• Cosmic-ray energy spectrum and composition up to the ankle - the case for a second Galactic component
• GeV-TeV cosmic-ray spectral anomaly as due to re-acceleration by weak shocks in the Galaxy
• Excesses of Cosmic Ray Spectra from A Single Nearby Source
• The Connection Between the Positron Fraction Anomaly and the Spectral Features in Galactic Cosmic-Ray Hadrons
• Origin of the Proton-to-Helium Ratio Anomaly in Cosmic Rays
• Revisiting Spatial-Dependent Propagation Model with Latest Observations of Cosmic Ray Nuclei
• Galactic cosmic-ray model in the light of AMS-02 nuclei data
• Recent results in cosmic ray physics and their interpretation
• Testing universality of cosmic-ray acceleration with proton/helium data from AMS and Voyager-1
• Bayesian analysis of the hardening in AMS-02 nuclei spectra
• Selected Topics in Cosmic Ray Physics
• Evidence of fresh cosmic ray in galactic plane based on DAMPE measurement of B/C and B/O ratios
• The Important Role of Cosmic-Ray Re-Acceleration
• Some new hints on cosmic-ray propagation from AMS-02 nuclei spectra
• Possible physics scenarios behind cosmic-ray "anomalies"
• Origin of hardening in spectra of cosmic ray nuclei at a few hundred GeV using AMS-02 data
• Transport parameters from AMS-02 F/Si data and fluorine source abundance
• A possible origin of gamma rays from the Fermi Bubbles
• Anomaly in the cosmic-ray energy spectrum at GeV-TeV energies