Data Analysis for the Measurement of High Energy Cosmic Ray Electron/Positron Spectrum with Fermi-LAT

Abstract

The Large Area Telescope (LAT) instrument on board the Fermi satellite consists of a multi-layer silicon-strip tracker interleaved with tungsten converters (TKR), followed by a CsI crystal hodoscopic calorimeter (CAL). Sixteen TKR and CAL modules are assembled in a 4$\times$4 array. A segmented anticoincidence plastic scintillator (ACD) surrounds the TKRs. The primary cosmic-ray electron/positron energy spectrum has been measured from 20 GeV to 1 TeV using a dedicated event analysis that ensures efficient electron detection and reduced hadron contamination. Results from detailed Monte Carlo simulations have been used to reconstruct the observed energy spectrum to the primary cosmic ray spectrum. We present here details of the analysis procedure and the energy spectrum reconstruction.

4 pages, 5 figures, Contribution to the 31st ICRC, Lodz, Poland, July 2009

References in corpus (6)

• The Large Area Telescope on the Fermi Gamma-ray Space Telescope Mission
• Observation of an anomalous positron abundance in the cosmic radiation
• Measurement of the Cosmic Ray e+ plus e- spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope
• The On-orbit Calibrations for the Fermi Large Area Telescope
• Measurement of the Cosmic Ray electron plus positron spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope
• Instrument simulation for the analysis of cosmic ray electron with the Fermi LAT

Cited by in corpus (2)

• The First Fermi Large Area Telescope Catalog of Gamma-ray Pulsars
• Instrument simulation for the analysis of cosmic ray electron with the Fermi LAT