# Fermi LAT observations of cosmic-ray electrons from 7 GeV to 1 TeV

Abstract : We present the results of our analysis of cosmic-ray electrons using about 8 million electron candidates detected in the first 12 months on-orbit by the Fermi Large Area Telescope. This work extends our previously-published cosmic-ray electron spectrum down to 7 GeV, giving a spectral range of approximately 2.5 decades up to 1 TeV. We describe in detail the analysis and its validation using beam-test and on-orbit data. In addition, we describe the spectrum measured via a subset of events selected for the best energy resolution as a cross-check on the measurement using the full event sample. Our electron spectrum can be described with a power law $\propto {\rm E}^{-3.08 \pm 0.05}$ with no prominent spectral features within systematic uncertainties. Within the limits of our uncertainties, we can accommodate a slight spectral hardening at around 100 GeV and a slight softening above 500 GeV.
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http://hal.in2p3.fr/in2p3-00585122
Contributor : Virginie Mas <>
Submitted on : Monday, April 11, 2011 - 5:22:19 PM
Last modification on : Friday, December 18, 2020 - 12:54:07 PM

### Citation

Markus Ackermann, Marco Ajello, W. B. Atwood, Luca Baldini, Jean Ballet, et al.. Fermi LAT observations of cosmic-ray electrons from 7 GeV to 1 TeV. Physical Review D, American Physical Society, 2010, 82, pp.092004. ⟨10.1103/PhysRevD.82.092004⟩. ⟨in2p3-00585122⟩

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