Cosmic-ray propagation with DRAGON2: I. numerical solver and astrophysical ingredients

2016/07/31 by Carmelo Evoli, Daniele Gaggero, Andrea Vittino +5 · 7 citations
Physics and Astronomy · #Advection #Astrophysics and Cosmic Phenomena #Code (set theory) #Dark Matter and Cosmic Phenomena #Galaxies: Formation, Evolution, Phenomena #Homogeneous #Modular design #Solver #Space (punctuation) #astro-ph.HE

paper · pdf · doi:10.1088/1475-7516/2017/02/015

published as JCAP 02, 015, 2017 · 62 pages, 27 figures, 6 tables. Matches published JCAP version

openalex created_date 2016/08/23 · openalex publication_date 2017/02/08 · arxiv created 2017/03/27 · arxiv updated 2017/03/28 · openalex updated_date 2026/08/05

Abstract

We present version 2 of the DRAGON code designed for computing realistic predictions of the CR densities in the Galaxy. The code numerically solves the interstellar CR transport equation (including inhomogeneous and anisotropic diffusion, either in space and momentum, advective transport and energy losses), under realistic conditions. The new version includes an updated numerical solver and several models for the astrophysical ingredients involved in the transport equation. Improvements in the accuracy of the numerical solution are proved against analytical solutions and in reference diffusion scenarios. The novel features implemented in the code allow to simulate the diverse scenarios proposed to reproduce the most recent measurements of local and diffuse CR fluxes, going beyond the limitations of the homogeneous galactic transport paradigm. To this end, several applications using DRAGON2 are presented as well. This new version facilitates the users to include their own physical models by means of a modular C++ structure.

Citations

• The Spatial Energy Spectrum of Magnetic Fields in Our Galaxy
• Ultrahigh energy nuclei in the turbulent Galactic magnetic field
• On the Origins of Cosmic Rays
• Secondary Antiprotons and Propagation of Cosmic Rays in the Galaxy and Heliosphere
• The interstellar environment of our galaxy
• H I in the Galaxy
• Bremsstrahlung, Synchrotron Radiation, and Compton Scattering of High-Energy Electrons Traversing Dilute Gases
• High Statistics Measurement of the Positron Fraction in Primary Cosmic Rays of 0.5–500 GeV with the Alpha Magnetic Spectrometer on the International Space Station
• Three-Dimensional Model of Cosmic-Ray Lepton Propagation Reproduces Data from the Alpha Magnetic Spectrometer on the International Space Station
• The distribution of cosmic-ray sources in the Galaxy, γ-rays and the gradient in the CO-to-H2relation
• Electron and Positron Fluxes in Primary Cosmic Rays Measured with the Alpha Magnetic Spectrometer on the International Space Station
• The Vertical Structure of Warm Ionised Gas in the Milky Way
• Challenging Cosmic‐Ray Propagation with Antiprotons: Evidence for a “Fresh” Nuclei Component?
• Radial distribution of the diffuseγ-ray emissivity in the Galactic disk
• A Markov Chain Monte Carlo technique to sample transport and source parameters of Galactic cosmic rays
• Systematic uncertainties on the cosmic-ray transport parameters

Cited by

• Testing Physical Models for Cosmic Ray Transport Coefficients on Galactic Scales: Self-Confinement and Extrinsic Turbulence at GeV Energies
• Cosmic-Ray Driven Outflows to Mpc Scales from L_∗ Galaxies
• Geminga SNR: Possible Candidate of the Local Cosmic-Ray Factory
• Theoretical Interpretation of Pass 8 Fermi-LAT e+ + e− Data
• Gamma-ray haloes around pulsars as the key to understanding cosmic-ray transport in the Galaxy
• Markov chain Monte Carlo analyses of the flux ratios of B, Be and Li with the DRAGON2 code
• Possible bump structure of cosmic ray electrons unveiled by AMS-02 data and its common origin along with the nuclei and positron