High-Statistics Measurement of the Cosmic-Ray Electron Spectrum with H.E.S.S.
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Date
2024
Authors
Aharonian, F.
Benkhali, F.A.
Aschersleben, J.
Ashkar, H.
Backes, M.
Martins, V.B.
Batzofin, R.
Becherini, Y.
Berge, D.
Bernlöhr, K.
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Physical Review Letters, 2024; 133(22):221001-1-221001-8
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H.E.S.S. Collaboration
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Abstract
Owing to their rapid cooling rate and hence loss-limited propagation distance, cosmic-ray electrons and positrons (CRe) at very high energies probe local cosmic-ray accelerators and provide constraints on exotic production mechanisms such as annihilation of dark matter particles. We present a high-statistics measurement of the spectrum of CRe candidate events from 0.3 to 40 TeV with the High Energy Stereoscopic System, covering 2 orders of magnitude in energy and reaching a proton rejection power of better than 104. The measured spectrum is well described by a broken power law, with a break around 1 TeV, where the spectral index increases from Γ1=3.25±0.02(stat)±0.2(sys) to Γ2=4.49±0.04(stat)±0.2(sys). Apart from the break, the spectrum is featureless. The absence of distinct signatures at multi-TeV energies imposes constraints on the presence of nearby CRe accelerators and the local CRe propagation mechanisms.
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© 2024 American Physical Society