First results on Cosmic Ray electron spectrum below 20 GeV from the Fermi LAT

Details First results on Cosmic Ray electron spectrum below 20 GeV from the Fermi LAT First results on Cosmic Ray electron spectrum below 20 GeV from the Fermi LAT

2009-07-02

arxiv.org/abs/0907.0387v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

4 pages, 5 figures, ICRC 2009 proceedings

Scientific paper

Designed to be a successor of the previous flown space based gamma ray detectors, the Fermi Large Area Telescope (LAT) is also an electron detector. Taking advantage of its capability to separate electromagnetic and hadronic signals it is possible to accurately measure the Cosmic Ray electron spectrum. The spectra of primary cosmic ray electrons below 20 GeV is influenced by many local effects such as solar modulation and the geomagnetic cutoff. For energies below a few GeV it is possible to observe the albedo population of electrons which are controlled by the local magnetic field. In this paper we present the LAT electron analysis in particular event selection and validation as well as the first results on the measurement of the electron spectrum below 20 GeV.

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