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Measurement of separate cosmic-ray electron and positron spectra with the fermi large area telescope
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Bonamente, E. Blandford, R. D. Brogland, A. W. Buehler, R. Harding, A. K. Ajello, M. Allafort, A. Bouvier, A. Barbiellini, G. Bloom, E. D. Caliandro, G. A. Bellazzini, R. McEnery, J. E. Berenji, B. Baldini, L. Brigida, M. Bechtol, K. Ferrara, E. C. Buson, S. Ackermann, M. Bregeon, J. Caraveo, P. A. Cameron, R. A. Bastieri, D. Bruel, P. |
| Copyright Year | 2011 |
| Description | 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 the Earth's shadow, which is offset in opposite directions for opposite charges due to the 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 GeV and 200 GeV, We confirm that the fraction rises with energy in the 20-100 GeV range and determine for the first time that it continues to rise between 100 and 200 GeV, |
| File Size | 741121 |
| Page Count | 8 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20110023493 |
| Archival Resource Key | ark:/13960/t6h180w80 |
| Language | English |
| Publisher Date | 2011-01-01 |
| Access Restriction | Open |
| Subject Keyword | Astrophysics Protons Geomagnetism Positrons Telescopes Electron Spectroscopy Spectra Cosmic Rays Electrons Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
