Testing the Origin of High-Energy Cosmic Rays
Abstract
Recent accurate measurements of cosmic-ray (CR) protons and nuclei by ATIC-2, CREAM, and PAMELA reveal: a) unexpected spectral hardening in the spectra of CR species above a few hundred GeV per nucleon, b) a harder spectrum of He compared to protons, and c) softening of the CR spectra just below the break energy. These newly-discovered features may offer a clue to the origin of the observed high-energy Galactic CRs. We discuss possible interpretations of these spectral features and make predictions for the secondary CR fluxes and secondary to primary ratios, anisotropy of CRs, and diffuse Galactic {\gamma}-ray emission in different phenomenological scenarios. Our predictions can be tested by currently running or near-future high-energy astrophysics experiments.
Cite
@article{arxiv.1108.1023,
title = {Testing the Origin of High-Energy Cosmic Rays},
author = {Andrey E. Vladimirov and Guðlaugur Jóhannesson and Igor V. Moskalenko and Troy A. Porter},
journal= {arXiv preprint arXiv:1108.1023},
year = {2016}
}
Comments
23 pages, 14 color figures. Accepted for publication in ApJ