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Fermi LAT observations of cosmic-ray electrons from 7 GeV to 1 TeV
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2010 (English)In: Physical Review D. Particles and fields, ISSN 0556-2821, E-ISSN 1089-4918, Vol. 82, no 9, 092004- p.Article in journal (Refereed) Published
Abstract [en]

We present the results of our analysis of cosmic-ray electrons using about 8 x 10(6) 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 proportional to 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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2010. Vol. 82, no 9, 092004- p.
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Physical Sciences
URN: urn:nbn:se:su:diva-51369DOI: 10.1103/PhysRevD.82.092004ISI: 000284402000002OAI: diva2:384543
authorCount :195Available from: 2011-01-10 Created: 2011-01-10 Last updated: 2011-01-10Bibliographically approved

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Conrad, JanGarde, Maja LlenaRipken, JoachimYang, Zhaoyu
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