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タイトルMeasurement of Separate Cosmic-Ray Electron and Positron Spectra with the Fermi Large Area Telescope
著者(英)McEnery, J. E.; Ackemann, M.; Moiseev, A. A.; Ferrara, E. C.; Harding, A. K.
著者所属(英)NASA Goddard Space Flight Center
発行日2012-01-06
言語eng
内容記述We measured separate cosmic-ray electron and positron spectra with the Fermi Large Area Telescope. Because the instrument does not have an onboard magnet, we distinguish the two species by exploiting Earth's shadow, which, is offset in opposite directions for opposite charges due to Earth's magnetic field. We estimate and subtract the cosmic-ray proton background using two different methods that produce consistent results. We report the electron-only spectrum, the positron-only spectrum, and the positron fraction between 20 and 200 Ge V. We confirm that the fraction rises with energy in the 20-100 Ge V range. The three new spectral points between 100 and 200 GeV are consistent with a fraction that is continuing to rise with energy.
NASA分類Astrophysics
レポートNOGSFC.JA.6826.2012
権利Copyright


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