Diffuse Galactic Gamma Rays from Shock-Accelerated Cosmic Rays

Charles D. Dermer
Phys. Rev. Lett. 109, 091101 – Published 29 August 2012

Abstract

A shock-accelerated particle flux ps, where p is the particle momentum, follows from simple theoretical considerations of cosmic-ray acceleration at nonrelativistic shocks followed by rigidity-dependent escape into the Galactic halo. A flux of shock-accelerated cosmic-ray protons with s2.8 provides an adequate fit to the Fermi Large Area Telescope γ-ray emission spectra of high-latitude and molecular cloud gas when uncertainties in nuclear production models are considered. A break in the spectrum of cosmic-ray protons claimed by Neronov, Semikoz, and Taylor [Phys. Rev. Lett. 108, 051105 (2012)] when fitting the γ-ray spectra of high-latitude molecular clouds is a consequence of using a cosmic-ray proton flux described by a power law in kinetic energy.

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  • Received 9 June 2012

DOI:https://doi.org/10.1103/PhysRevLett.109.091101

Published by the American Physical Society

Authors & Affiliations

Charles D. Dermer*

  • Space Science Division, Code 7653, Naval Research Laboratory, Washington, D.C. 20375-5352, USA

  • *charles.dermer@nrl.navy.mil

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Vol. 109, Iss. 9 — 31 August 2012

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