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“Three-Dimensional Model of Cosmic-Ray Lepton Propagation Reproduces Data from the Alpha Magnetic Spectrometer on the International Space Station”

Journal article
Authors Daniele Gaggero
Carmelo Evoli
Luca Maccione
Giuseppe Di Bernardo
Dario Grasso
Published in Physical Review Letters
Volume 111
Issue 2
Pages artikel nr 021102
ISSN 0031-9007
Publication year 2013
Published at Department of Physics (GU)
Pages artikel nr 021102
Language en
Links dx.doi.org/10.1103/PhysRevLett.111....
https://gup.ub.gu.se/file/121779
Subject categories Physical Sciences, Astronomy, Astrophysics and Cosmology, High energy astrophysics

Abstract

We study the compatibility of Alpha Magnetic Spectrometer (AMS-02) data on the cosmic-ray (CR) positron fraction with data on the CR electron and positron spectra provided by PAMELA and Fermi LAT. We do that in terms of a novel propagation model in which sources are distributed in spiral arm patterns in agreement with astrophysical observations. While former interpretations assumed an unrealistically steep injection spectrum for astrophysical background electrons, the enhanced energy losses experienced by CR leptons due to the larger average source distance from Earth allow us to reproduce the data with harder injection spectra as expected in a shock acceleration scenario. Moreover, we show that in this approach, and accounting for AMS-02 results, the contribution of nearby accelerators to the fluxes at very high energy can be significantly reduced, thus avoiding any tension with anisotropy upper limits.

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