Galactic cosmic-ray propagation in the light of AMS-02: I. Analysis of protons, helium, and antiprotons

Abstract

We present novel constraints on cosmic-ray propagation in the Galaxy using the recent precise measurements of proton and helium spectra from AMS-02, together with preliminary AMS-02 data on the antiproton over proton ratio. To explore efficiently the large (up to eleven-dimensional) parameter space we employ the nested-sampling algorithm as implemented in the \textsc{MultiNest} package, interfaced with the \textsc{Galprop} code to compute the model-predicted spectra. We use VOYAGER proton and helium data, sampling the local inter-stellar spectra, to constrain the solar modulation potential. We find that the turbulence of the Galactic magnetic field is well constrained, i.e., $\delta =0.30_{-0.02}^{+0.03}(stat{)}_{-0.04}^{+0.10}(sys)$, with uncertainties dominated by systematic effects. Systematic uncertainties are determined checking the robustness of the results to the minimum rigidity cut used to fit the data (from 1 GV to 5 GV), to the propagation scenario (convection vs no-convection), and to the uncertainties in the knowledge of the antiproton production cross section. Convection and reaccelaration are found to be degenerate and not well-constrained singularly when using data above 5 GV. Using data above 1 GV reacceleration is required, $v_{\mathrm{A}}=25\pm 2$km/s, although this value might be significantly affected by the low energy systematic uncertainty in the solar modulation. In a forthcoming companion paper, we investigate the constraints imposed by AMS-02 measurements on lithium, boron, and carbon.

20 pages, 15 figures, 4 tables; V3: Updated to the final PRD version

References in corpus (6)

• Observation of an anomalous positron abundance in the cosmic radiation
• Cosmic-Ray Proton and Helium Spectra from the First CREAM Flight
• Spectral breaks as a signature of cosmic ray induced turbulence in the Galaxy
• Inhomogeneity in the Supernova Remnant Distribution as the Origin of the PAMELA Anomaly
• The Cosmic Ray Antiproton Background for AMS-02
• A Markov Chain Monte Carlo for Galactic Cosmic Ray physics: I. Method and results for the Leaky Box Model

Cited by in corpus (27)

• Scrutinizing the evidence for dark matter in cosmic-ray antiprotons
• Testing Physical Models for Cosmic Ray Transport Coefficients on Galactic Scales: Self-Confinement and Extrinsic Turbulence at GeV Energies
• Cosmic-ray transport from AMS-02 B/C data: benchmark models and interpretation
• Cosmic-Ray Driven Outflows to Mpc Scales from $L_{\ast }$ Galaxies
• Handling the Uncertainties in the Galactic Dark Matter Distribution for Particle Dark Matter Searches
• Combined analysis of AMS-02 (Li,Be,B)/C, N/O, 3He, and 4He data
• First Predicted Cosmic Ray Spectra, Primary-to-Secondary Ratios, and Ionization Rates from MHD Galaxy Formation Simulations
• Standard Self-Confinement and Extrinsic Turbulence Models for Cosmic Ray Transport are Fundamentally Incompatible with Observations
• Power requirements for cosmic ray propagation models involving diffusive reacceleration; estimates and implications for the damping of interstellar turbulence
• Implications of Lithium to Oxygen AMS-02 spectra on our understanding of cosmic-ray diffusion
• Diffuse Emission of Galactic High-Energy Neutrinos from a Global Fit of Cosmic Rays
• Cosmic-Ray Transport in Simulations of Star-forming Galactic Disks
• A Consistent Reduced-Speed-of-Light Formulation of Cosmic Ray Transport Valid in Weak and Strong-Scattering Regimes
• Testing the universality of cosmic-ray nuclei from protons to oxygen with AMS-02
• Interpretations of the cosmic ray secondary-to-primary ratios measured by DAMPE
• New determination of the production cross section for secondary positrons and electrons in the Galaxy
• Constraining dark matter annihilation with cosmic ray antiprotons using neural networks
• Universal profiles for radio searches of dark matter in dwarf galaxies
• Cosmic-ray antiprotons in the AMS-02 era: A sensitive probe of dark matter
• Constraints on dark matter annihilation from the FAST observation of the Coma Berenices dwarf galaxy
• Hadronic Interactions of Energetic Charged Particles in Protogalactic Outflow Environments and Implications for the Early Evolution of Galaxies
• Weakly interacting massive particle cross section limits from LOFAR observations of dwarf spheroidal galaxies
• Weighing the Local Interstellar Medium using Gamma Rays and Dust
• An accurate treatment of scattering and diffusion in piecewise power-law models for cosmic ray and radiation/neutrino transport
• A Simple Sub-Grid Model For Cosmic Ray Effects on Galactic Scales
• $\overline{\text{D}}$arkRayNet: Emulation of cosmic-ray antideuteron fluxes from dark matter
• Constraining the cosmic ray propagation halo thickness using Fermi-LAT observations of high-latitude clouds