New results on source and diffusion spectral features of Galactic cosmic rays: I- B/C ratio

Abstract

In a previous study (Maurin et al., 2001), we explored the set of parameters describing diffusive propagation of cosmic rays (galactic convection, reacceleration, halo thickness, spectral index and normalization of the diffusion coefficient), and we identified those giving a good fit to the measured B/C ratio. This study is now extended to take into account a sixth free parameter, namely the spectral index of sources. We use an updated version of our code where the reacceleration term comes from standard minimal reacceleration models. The goal of this paper is to present a general view of the evolution of the goodness of fit to B/C data with the propagation parameters. In particular, we find that, unlike the well accepted picture, and in accordance with our previous study, a Kolmogorov-like power spectrum for diffusion is strongly disfavored. Rather, the ${\chi }^2$ analysis points towards $\delta \gtrsim 0.7$ along with source spectra index $\lesssim 2.0$. Two distinct energy dependences are used for the source spectra: the usual power-law in rigidity and a law modified at low energy, the second choice being only slightly preferred. We also show that the results are not much affected by a different choice for the diffusion scheme. Finally, we compare our findings to recent works, using other propagation models. This study will be further refined in a companion paper, focusing on the fluxes of cosmic ray nuclei.

32 pages, 13 figures, accepted in A&A

References in corpus (6)

• Secondary antiprotons and propagation of cosmic rays in the Galaxy and heliosphere
• Cosmic Rays below Z=30 in a diffusion model: new constraints on propagation parameters
• Antiprotons from spallations of cosmic rays on interstellar matter
• The gradient of diffuse gamma-ray emission in the Galaxy
• Antiprotons from primordial black holes
• $\beta$--Radioactive Cosmic Rays in a diffusion model: test for a local bubble?

Cited by in corpus (70)

• Particle Dark Matter: Evidence, Candidates and Constraints
• Cosmic-ray propagation and interactions in the Galaxy
• Calibrating Extinction-Free Star Formation Rate Diagnostics with 33GHz Free-Free Emission in NGC6946
• Antiprotons in cosmic rays from neutralino annihilation
• Constraints on cosmic-ray propagation models from a global Bayesian analysis
• Cosmic-Ray Nuclei, Antiprotons and Gamma-rays in the Galaxy: a New Diffusion Model
• Galactic secondary positron flux at the Earth
• The Far-Infrared--Radio Correlation at High Redshifts: Physical Considerations and Prospects for the Square Kilometer Array
• Bayesian analysis of cosmic-ray propagation: evidence against homogeneous diffusion
• Heavy Wino-like Neutralino Dark Matter Annihilation into Antiparticles
• A Markov Chain Monte Carlo technique to sample transport and source parameters of Galactic cosmic rays: II. Results for the diffusion model combining B/C and radioactive nuclei
• Full calculation of clumpiness boost factors for antimatter cosmic rays in the light of Lambda-CDM N-body simulation results
• Propagation of cosmic rays in the AMS-02 era
• A new interpretation of the far-infrared - radio correlation and the expected breakdown at high redshift
• Antideuteron fluxes from dark matter annihilation in diffusion models
• Connecting Far-Infrared and Radio Morphologies of Disk Galaxies: Cosmic-Ray Electron Diffusion After Star Formation Episodes
• Indications for a high-rigidity break in the cosmic-ray diffusion coefficient
• Cosmic-ray transport from AMS-02 B/C data: benchmark models and interpretation
• Systematic uncertainties on the cosmic-ray transport parameters: Is it possible to reconcile B/C data with delta = 1/3 or delta = 1/2?
• Kaluza-Klein Dark Matter and the Positron Excess
• Indirect signals from light neutralinos in supersymmetric models without gaugino mass unification
• Positron transport in the interstellar medium
• Constraints on particle dark matter from cosmic-ray antiprotons
• Prospects for indirect dark matter searches with MeV photons
• Cosmic Positron Signature from Dark Matter in the Littlest Higgs Model with T-parity
• The Cosmic Ray Antiproton Background for AMS-02
• Combined analysis of AMS-02 (Li,Be,B)/C, N/O, 3He, and 4He data
• Can Supersymmetry Naturally Explain the Positron Excess?
• A Markov Chain Monte Carlo for Galactic Cosmic Ray physics: I. Method and results for the Leaky Box Model
• Spatial Origin of Galactic Cosmic Rays in Diffusion Models: I- Standard sources in the Galactic disk
• Cosmic Ray Models
• USINE: semi-analytical models for Galactic cosmic-ray propagation
• Radio data and synchrotron emission in consistent cosmic ray models
• Fitting B/C cosmic-ray data in the AMS-02 era: A cookbook
• Dark matter searches with cosmic antideuterons: status and perspectives
• p, He, and C to Fe cosmic-ray primary fluxes in diffusion models: Source and transport signatures on fluxes and ratios
• Diffusion coefficient and acceleration spectrum from direct measurements of charged cosmic ray nuclei
• Antiproton fluxes from light neutralinos
• Cosmic-ray positrons from millisecond pulsars
• Cosmic ray electrons and positrons from discrete stochastic sources
• Anti-deuterons from heavy Dark Matter
• Galactic synchrotron emission from WIMPs at radio frequencies
• Direct constraints on diffusion models from cosmic-ray positron data: Excluding the Minimal model for dark matter searches
• Simulations of cosmic ray propagation
• Antideuterons as a probe of primordial black holes
• Complementarity of Galactic radio and collider data in constraining WIMP dark matter models
• Galactic Signatures of Decaying Dark Matter
• Spatial Origin of Galactic Cosmic Rays in Diffusion Models: II- Exotic Primary Cosmic Rays
• Constraining Decaying Dark Matter with Fermi LAT Gamma-rays
• Dark Matter after BESS-Polar II
• The Local Interstellar Spectrum of Cosmic Ray Electrons
• Galactic cosmic-ray model in the light of AMS-02 nuclei data
• Sub-GeV galactic cosmic-ray antiprotons from primordial black holes in the Randall-Sundrum braneworld
• Leptons from Dark Matter Annihilation in Milky Way Subhalos
• Local dark matter clumps and the cosmic ray positron excess
• Dark matter and Colliders searches in the MSSM
• Antiproton Limits on Decaying Gravitino Dark Matter
• Distinguishing Supersymmetry From Universal Extra Dimensions or Little Higgs Models With Dark Matter Experiments
• Late decaying 2-component dark matter scenario as an explanation of the AMS-02 positron excess
• Antimatter cosmic rays from dark matter annihilation: First results from an N-body experiment
• The importance of Fe fragmentation for LiBeB analyses: Is a Li primary source needed to explain AMS-02 data?
• TeV cosmic-ray proton and helium spectra in the myriad model II
• Extracting the size of the cosmic electron-positron anomaly
• Spallation dominated propagation of Heavy Cosmic Rays and the Local Interstellar Medium (LISM)
• Diffuse $\gamma$-rays and $\bar{p}$ flux from dark matter annihilation -- a model for consistent results with EGRET and cosmic ray data
• Obtaining cosmic ray propagation parameters from diffuse VHE gamma ray emission from the Galactic center ridge
• Transport parameters from AMS-02 F/Si data and fluorine source abundance
• Enhanced cosmic-ray antihelium production from dark matter annihilation through light mediators
• Searching for Dark Photon Dark Matter with Cosmic Ray Antideuterons
• Perspectives of dark matter searches with antideuterons