Cosmic-Ray Hardenings in the Light of AMS-02

Abstract

Recent precise observations of cosmic rays (CRs) by AMS-02 experiment clearly show (1) harder spectra of helium and carbon compared to protons by $\propto R^{0.08}$, and (2) concave breaks in proton and helium spectra at a rigidity $R\sim 300$ GV. In particular the helium and carbon spectra are exactly similar, pointing to the same acceleration site. We examine possible interpretations of these features and identify a chemically enriched region, that is, superbubbles as the most probable origin of Galactic CRs in high rigidity $R>30$ GV. The similar spectra of CR carbon and helium further suggest that the CRs with $R>30$ GV originate from the supernova ejecta in the superbubble core, mixed with comparable or less amount of interstellar medium. We predict similar spectra for heavy nuclei.

7 pages, 2 figures, 1 table, accepted for publication in PRD

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Cited by in corpus (32)

• The DArk Matter Particle Explorer mission
• Proton and Helium Spectra from the CREAM-III Flight
• Direct Measurement of the Cosmic-Ray Proton Spectrum from 50 GeV to 10 TeV with the Calorimetric Electron Telescope on the International Space Station
• A Precision Search for WIMPs with Charged Cosmic Rays
• Inference of the Local Interstellar Spectra of Cosmic Ray Nuclei Z<=28 with the GalProp-HelMod Framework
• Bayesian analysis of spatial-dependent cosmic-ray propagation: astrophysical background of antiprotons and positrons
• Observation of Spectral Structures in the Flux of Cosmic-Ray Protons from 50 GeV to 60 TeV with the Calorimetric Electron Telescope on the International Space Station
• Galactic cosmic-ray propagation in the light of AMS-02: I. Analysis of protons, helium, and antiprotons
• Understanding the spectral hardenings and radial distribution of Galactic cosmic rays and Fermi diffuse gamma-rays with spatially-dependent propagation
• Direct Measurement of the Cosmic-Ray Carbon and Oxygen Spectra from 10 GeV$/n$ to 2.2 TeV$/n$ with the Calorimetric Electron Telescope on the International Space Station
• Deciphering the local Interstellar spectra of primary cosmic ray species with HelMod
• Measurement of the Iron Spectrum in Cosmic Rays from 10 GeV$/n$ to 2.0 TeV$/n$ with the Calorimetric Electron Telescope on the International Space Station
• Direct Measurement of the Cosmic-Ray Helium Spectrum from 40 GeV to 250 TeV with the Calorimetric Electron Telescope on the International Space Station
• Pulsar Wind Nebulae inside Supernova Remnants as Cosmic-Ray PeVatrons
• Sagittarius A* as an Origin of the Galactic PeV Cosmic Rays?
• Acceleration of Cosmic Rays in Supernova Shocks: elemental selectivity of the injection mechanism
• Cosmic rays from supernova remnants and superbubbles
• Anomalous distributions of primary cosmic rays as evidence for time-dependent particle acceleration in Supernova remnants
• The Origin of Cosmic Rays: How Their Composition Defines Their Sources and Sites, and the Processes of Their Mixing, Injection and Acceleration
• A deep learning method for the trajectory reconstruction of cosmic rays with the DAMPE mission
• Cosmic-Ray Lithium Production at the Nova Eruption Followed by a Type Ia Supernova
• Direct Measurement of the Nickel Spectrum in Cosmic Rays in the Energy Range from 8.8 GeV/n to 240 GeV/n with CALET on the International Space Station
• Anomalous Galactic Cosmic Rays in the Framework of AMS-02
• 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
• Origin of Spectral Hardening of Secondary Cosmic-Ray Nuclei
• Escape of cosmic rays from perpendicular shocks in the circumstellar magnetic field
• Newly-Discovered Anomalies in Galactic Cosmic Rays: Time for Exotic Scenarios?
• Electron Energization in Quasi-Parallel Shocks: Test-Particle-Electrons in a Proton Driven Turbulence
• Transport parameters from AMS-02 F/Si data and fluorine source abundance
• Evidence for GeV Cosmic Rays from White Dwarfs in the Local Cosmic Ray Spectra and in the Gamma-ray Emissivity of the Inner Galaxy
• Direct measurements of cosmic rays and their possible interpretations