Constraints on the Cosmic Rays in the Small Magellanic Cloud

Details Constraints on the Cosmic Rays in the Small Magellanic Cloud Constraints on the Cosmic Rays in the Small Magellanic Cloud

1993-02-25

arxiv.org/abs/astro-ph/9302018v1

Phys.Rev.Lett. 71 (1993) 3394

Astronomy and Astrophysics

Astrophysics

4 pages, phyzzx file, Institute for Advanced Study number AST 93/8

Scientific paper

10.1103/PhysRevLett.71.3394

We show that recent $\gamma$-ray observations of the Small Magellanic Cloud with EGRET rule out a universal cosmic ray flux only at energies below $\approx 10$ GeV, while the observed diffuse X-ray and $\gamma$-ray background radiations have already ruled out, by more than three orders of magnitude, a universal extragalactic cosmic ray flux identical to that observed in the local solar neighborhood at energies below $10^6$ GeV.

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