Diffuse Galactic Gamma Rays from Shock-Accelerated Cosmic Rays

Autor:	Dermer, Charles D.
Rok vydání:	2012
Předmět:	Astrophysics - High Energy Astrophysical Phenomena Astrophysics - Astrophysics of Galaxies
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevLett.109.091101
Popis:	A shock-accelerated particle flux \propto p^-s, 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 s ~ 2.8 provides an adequate fit to the Fermi-LAT gamma-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, & Taylor (PRL, 108, 051105, 2012) when fitting the gamma-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. Comment: Version to correspond to published letter in PRL; corrected Fig. 2
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1206.2899 Zobrazit plný text záznamu View this record from Arxiv