Searches for Cosmic-Ray Electron Anisotropies with the Fermi Large Area Telescope

Details Searches for Cosmic-Ray Electron Anisotropies with the Fermi Large Area Telescope Searches for Cosmic-Ray Electron Anisotropies with the Fermi Large Area Telescope

2010-08-30

arxiv.org/abs/1008.5119v3

Phys.Rev.D82:092003,2010

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

16 pages, 10 figures, accepted for publication in Physical Review D - contact authors: M.N. Mazziotta and V. Vasileiou

Scientific paper

10.1103/PhysRevD.82.092003

The Large Area Telescope on board the \textit{Fermi} satellite (\textit{Fermi}-LAT) detected more than 1.6 million cosmic-ray electrons/positrons with energies above 60 GeV during its first year of operation. The arrival directions of these events were searched for anisotropies of angular scale extending from $\sim$ 10 $^\circ$ up to 90$^\circ$, and of minimum energy extending from 60 GeV up to 480 GeV. Two independent techniques were used to search for anisotropies, both resulting in null results. Upper limits on the degree of the anisotropy were set that depended on the analyzed energy range and on the anisotropy's angular scale. The upper limits for a dipole anisotropy ranged from $\sim0.5%$ to $\sim10%$.

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