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Title: 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 (1) unexpected spectral hardening in the spectra of CR species above a few hundred GeV per nucleon, (2) a harder spectrum of He compared to protons, and (3) 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.

Authors:
; ;  [1];  [2]
  1. W. W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA 94305 (United States)
  2. Science Institute, University of Iceland, Dunhaga 5, IS-107 Reykjavik (Iceland)
Publication Date:
OSTI Identifier:
22037069
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 752; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANISOTROPY; ASTROPHYSICS; COSMIC NUCLEI; COSMIC PROTONS; DIFFUSION; ENERGY SPECTRA; GAMMA ASTRONOMY; GAMMA RADIATION; MILKY WAY; NONLUMINOUS MATTER; PHOTON EMISSION; SPECTRAL HARDENING; TESTING

Citation Formats

Vladimirov, A. E., Moskalenko, I. V., Porter, T. A., and Johannesson, G. TESTING THE ORIGIN OF HIGH-ENERGY COSMIC RAYS. United States: N. p., 2012. Web. doi:10.1088/0004-637X/752/1/68.
Vladimirov, A. E., Moskalenko, I. V., Porter, T. A., & Johannesson, G. TESTING THE ORIGIN OF HIGH-ENERGY COSMIC RAYS. United States. doi:10.1088/0004-637X/752/1/68.
Vladimirov, A. E., Moskalenko, I. V., Porter, T. A., and Johannesson, G. Sun . "TESTING THE ORIGIN OF HIGH-ENERGY COSMIC RAYS". United States. doi:10.1088/0004-637X/752/1/68.
@article{osti_22037069,
title = {TESTING THE ORIGIN OF HIGH-ENERGY COSMIC RAYS},
author = {Vladimirov, A. E. and Moskalenko, I. V. and Porter, T. A. and Johannesson, G.},
abstractNote = {Recent accurate measurements of cosmic-ray (CR) protons and nuclei by ATIC-2, CREAM, and PAMELA reveal (1) unexpected spectral hardening in the spectra of CR species above a few hundred GeV per nucleon, (2) a harder spectrum of He compared to protons, and (3) 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.},
doi = {10.1088/0004-637X/752/1/68},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 752,
place = {United States},
year = {2012},
month = {6}
}