Probing the ATIC peak in the cosmic-ray electron spectrum with H.E.S.S.

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Date
2009Author
Aharonian, F.
Büsching, I.
Davids, I.D.
De Jager, O.C.
Holleran, M.
Raubenheimer, B.C.
Venter, C.
H.E.S.S. Collaboration
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The measurement of an excess in the cosmic-ray electron spectrum between 300 and 800 GeV by the ATIC experiment has – together with
the PAMELA detection of a rise in the positron fraction up to
≈
100 GeV – motivated many interpretations in terms of dark matter scenarios;
alternative explanations assume a nearby electron source like a pulsar o
r supernova remnant. Here we present a measurement of the cosmic-ray
electron spectrum with H.E.S.S. starting at 340 GeV. While the overall electron flux measured by H.E.S.S. is consistent with the ATIC data within
statistical and systematic errors, the H.E.S.S. data exclude a pronounced peak in the electron spectrum as suggested for interpretation by ATIC.
The H.E.S.S. data follow a power-law spectrum with spectral index of 3
.
0
±
0
.
1(stat
.
)
±
0
.
3(syst
.
), which steepens at about 1 TeV