New Constraints on the Highest-Energy Cosmic-Ray Electrons and Positrons

Details New Constraints on the Highest-Energy Cosmic-Ray Electrons and Positrons New Constraints on the Highest-Energy Cosmic-Ray Electrons and Positrons

2009-12-02

arxiv.org/abs/0912.0264v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

4 pages, 2 figures

Scientific paper

At energies above a few TeV, no measurements of the cosmic-ray electron spectrum exist yet. By considering the similarity of air showers induced by electrons and gamma rays as seen by ground-based arrays, we use published limits on isotropic gamma-ray fluxes to place first constraints on the >10 TeV electron spectrum. We demonstrate that, due the proximity of known sources, the flux of such electrons (and positrons) can be large. We show how these smoothly connect to lower-energy positrons measured by PAMELA and relate to exciting new indications from Fermi.

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