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 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.
Cite
@article{arxiv.1008.3999,
title = {Fermi LAT observations of cosmic-ray electrons from 7 GeV to 1 TeV},
author = {Fermi LAT collaboration},
journal= {arXiv preprint arXiv:1008.3999},
year = {2012}
}
Comments
20 pages, 23 figures, 2 tables, published in Physical Review D 82, 092004 (2010) - contact authors: C. Sgro', A. Moiseev