Phys. Rev. Lett. 103, 111302 (2009) [4 pages]Inhomogeneity in Cosmic Ray Sources as the Origin of the Electron Spectrum and the PAMELA AnomalyReceived 16 April 2009; revised 7 July 2009; published 10 September 2009 We show that inhomogeneity of cosmic ray (CR) sources, due to the concentration of supernova remnants (SNRs) towards the galactic spiral arms, can naturally explain the anomalous increase in the positron/electron ratio observed by PAMELA. We consistently recover the observed positron fraction between 1 and 100 GeV using SNRs as the sole source of CRs. The contribution of a few known nearby SNRs dominates the CR electron spectrum above ∼100 GeV, leading to the relatively flat spectrum observed by Fermi and to the sharp cutoff observed by H.E.S.S. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.111302
DOI:
10.1103/PhysRevLett.103.111302
PACS:
98.70.Sa, 98.35.Hj, 98.58.Mj, 98.62.Hr
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