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

Ackermann, M.

doi:10.1103/PhysRevD.82.092004

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

Journal Article · Mon Nov 01 00:00:00 EDT 2010 · Physical Review. D, Particles, Fields, Gravitation and Cosmology

DOI:https://doi.org/10.1103/PhysRevD.82.092004· OSTI ID:1357520

Ackermann, M. ^[1]

SLAC National Accelerator Lab., Menlo Park, CA (United States); et al.

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 ∝ E ^{- 3.08 ± 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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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: Fermi LAT (United States)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1357520

Journal Information:: Physical Review. D, Particles, Fields, Gravitation and Cosmology, Vol. 82, Issue 9; ISSN 1550-7998

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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