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

M. Ackermann et al. (Fermi LAT Collaboration)
Phys. Rev. D 82, 092004 – Published 18 November 2010

Abstract

We present the results of our analysis of cosmic-ray electrons using about 8×106 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 E3.08±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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  • Received 7 May 2010

DOI:https://doi.org/10.1103/PhysRevD.82.092004

© 2010 The American Physical Society

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Searches for cosmic-ray electron anisotropies with the Fermi Large Area Telescope

M. Ackermann et al. (The Fermi LAT Collaboration)
Phys. Rev. D 82, 092003 (2010)

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Vol. 82, Iss. 9 — 1 November 2010

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