Production and propagation of cosmic-ray positrons and electrons

Abstract

We have made a new calculation of the cosmic-ray secondary positron spectrum using a diffusive halo model for Galactic cosmic-ray propagation. The code computes self-consistently the spectra of primary and secondary nucleons, primary electrons, and secondary positrons and electrons. The models are first adjusted to agree with the observed cosmic-ray Boron/Carbon ratio, and the interstellar proton and Helium spectra are then computed; these spectra are used to obtain the source function for the secondary positrons/electrons which are finally propagated with the same model parameters. The primary electron spectrum is evaluated, again using the same model. Fragmentation and energy losses are computed using realistic distributions for the interstellar gas and radiation fields, and diffusive reacceleration is also incorporated. Our study includes a critical re-evaluation of the secondary decay calculation for positrons. The predicted positron fraction is in good agreement with the measurements up to 10 GeV, beyond which the observed flux is higher than that calculated. Since the positron fraction is now accurately measured in the 1-10 GeV range our primary electron spectrum should be a good estimate of the true interstellar spectrum in this range, of interest for gamma ray and solar modulation studies. We further show that a harder interstellar nucleon spectrum, similar to that suggested to explain EGRET diffuse Galactic gamma ray observations above 1 GeV, can reproduce the positron observations above 10 GeV without requiring a primary positron component.

25 pages including 8 figures and 1 table, latex, aaspp4.sty. To be published in ApJ 1998, v.493 (February 1 issue). Details can be found at http://www.gamma.mpe-garching.mpg.de/~aws/aws.html

References in corpus (1)

• Measurements of the Cosmic-Ray Positron Fraction From 1 to 50 GeV

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• Current status and new perspectives on cosmic ray deuterons
• Injection spectra of different species of cosmic rays from AMS-02, ACE-CRIS and Voyager-1
• Constraining the Milky Way's Pulsar Population with the Cosmic-Ray Positron Fraction
• An observable electron-positron anisotropy cannot be generated by dark matter
• Fermi Constrains Dark Matter Origin of High Energy Positron Anomaly
• Consistency test of the AMS-02 antiproton excess with direct detection data based on the effective field theory approach
• Determination of Acceleration Mechanism Characteristics Directly and Non-Parametrically from Observations: Application to Supernova Remnants
• Cosmic Rays in the Milky Way and Beyond
• Current status and desired accuracy of the isotopic production cross-sections relevant to astrophysics of cosmic rays II. Fluorine to Silicon (and updated LiBeB)
• A gamma-ray study of galactic PeVatron candidates LHAASO J1825-1326 and LHAASO J1839-0545
• Galactic Centre as an efficient source of cosmic rays
• The role of Dark Matter annihilation in the radio emission of the galaxy cluster A520
• Results from PAMELA, ATIC and FERMI : Pulsars or Dark Matter ?
• Synchrotron Emission From Young And Nearby Pulsars
• Decaying LSP in SO(10) GUT and PAMELA's Cosmic Positron
• Investigating the Fermi Large Area Telescope sensitivity of detecting the characteristics of the Galactic center excess
• Cosmic Ray e^+/(e^- + e^+) and pbar/p Ratios Explained by an Injection Model Based on Gamma-ray Observations
• Hawking Radiation Signatures from Primordial Black Holes Transiting the Inner Solar System: Prospects for Detection
• Origin Of The Cosmic Ray Positrons Observed Near Earth- Meson Decay Or Dark Matter Decay?
• Probing the astrophysical origin of high-energy cosmic-ray electrons with Monte Carlo simulation
• Muon anomalous magnetic moment and positron excess at AMS-02 in a gauged horizontal symmetric model
• Geminga contribution to the cosmic-ray positron excess according to the gamma-ray observations
• Cosmology and the Dark Matter Frontier
• Forecasting of the time-dependent fluxes of antiprotons in the AMS-02 era
• Radio-FIR correlation- A probe into cosmic ray propagation in the nearby galaxy IC 342
• Deep Learning Models of the Discrete Component of the Galactic Interstellar Gamma-Ray Emission
• The Cosmic Ray Signature of Dark Matter Caustics
• Evidence for GeV Cosmic Rays from White Dwarfs in the Local Cosmic Ray Spectra and in the Gamma-ray Emissivity of the Inner Galaxy
• Testing the consistency of proapgation between light and heavy cosmic ray nuclei
• Improved Modeling of the Discrete Component of the Galactic Interstellar Gamma-ray Emission and Implications for the Fermi-LAT Galactic Center Excess
• The GALPROP Cosmic-ray Propagation and Non-thermal Emissions Framework: Release v57
• Cosmic rays: interstellar gamma-ray and radio emission
• The Galactic Isotropic $\gamma$-ray Background and Implications for Dark Matter
• Probing solar modulation of AMS-02 time-dependent D, ${}^3$He and ${}^4$He fluxes with modified force field approximation
• LISA test-mass charging. Particle flux modeling, Monte Carlo simulations and induced effects on the sensitivity of the observatory
• The Morphology of the Anomalous Microwave Emission in the Planck 2015 data release
• Sources and Radiations of the Fermi Bubbles
• Cosmic rays from multiwavelength observations of the Galactic diffuse emission
• On a possible origin of the gamma-ray excess around the Galactic Center
• Nonthermal Emission from Star-Forming Galaxies
• Galactic positrons and electrons from dark matter and astrophysical sources
• Production cross sections of gamma-rays, electrons, and positrons in p-p collisions
• Composite asymmetric dark matter with a dark photon portal: Multimessenger tests
• PAMELA's cosmic positron from decaying LSP in SO(10) SUSY GUT
• Explaining AMS-02 positron excess and muon anomalous magnetic moment in dark left-right gauge model
• New estimate for the contribution of the Geminga pulsar to the positron excess
• Non-thermal Dark Matter in $U(1{)}_{B-L}$ Extension of Inert Doublet Model
• The influence of the 3D Galactic gas structure on cosmic-ray transport and $\gamma$-ray emission
• Deciphering the Electron Spectral Hardening in AMS-02
• Analyzing Cosmic Ray Spectral Features: A Numerical Investigation
• Galactic Electron-Positron Annihilation Emission from X-Ray Binaries with Transient and Persistent Jets
• On the contribution of the bow shock pulsar wind nebula PSR J0437-4715 to the observed fluxes of GeV-TeV positrons and antiprotons
• Research on electron and positron spectrum in the high-energy region based on the gluon condensation model
• Particle Reacceleration by Turbulence and Radio Constraints on Multi-Messenger High-Energy Emission from the Coma Cluster
• Unparticle effects on cosmic ray photon and $e^{\pm }$
• On the stochastic nature of Galactic cosmic-ray sources
• Determination of Dark Matter Properties at High-Energy Colliders
• Constraining Galactic $p\gamma$ Interactions with Cosmic Ray Electron and Positron Spectra