Measurement of the Cosmic Ray e(+)+e(-) Spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope
Abdo, A.A. / Ackermann, M. / Ajello, M. / B. Atwood, W. / Axelsson, M. / Baldini, L. / Ballet, J. / Barbiellini, G. / Bastieri, D. / Battelino, M. / Baughmann, B.M. / Bechtol, K. / Bellazzini, R. / Berenji, B. / Blandford, R. D. / Bloom, E.D. / Bogaert, G. / Bonamente, E. / Borgland, A.W. / Bregeon, J. / Brez, A. / Brigida, M. / Bruel, P. / Burnett, T.H. / A.Caliandro, G. / Cameron, R.A. / A.Caraveo, P. / Carlson, P. / Casandjian, J.M. / Cecchi, C. / Charles, E. / Chekhtman, A. / Cheung, C.C. / Chiang, J. / Ciprini, S. / Claus, R. / Cohen-Tanugi, J. / Cominski, L.R. / Conrad, J. / Cutini, S. / D. Dermer, C. / De Angelis, A. / De Palma, F. / Digel, S.W. / Di Bernardo, G. / Silva, E.D.E. / Drell, P.S. / Dubois, R. / Dumora, D. / Edmonds, Y. / Farnier, C. / Favuzzi, C. / Focke, W.B. / Frailis, M. / Fukazawa, Y. / Funk, S. / Fusco, P. / Gaggero, D. / Gargano, F. / Gasparrini, D. / Gehrels, N. / Germani, S. / Giebels, B. / Giglietto, N. / Giordano, F. / Glanzman, T. / Godfrey, G. / Grasso, D. / Grenier, I.A. / Grondin, M.-H. / Grove, J.E. / Guillemot, L. / Guiriec, S. / Hanabata, Y. / Harding, A.K. / Hartman, R.C. / Hayashida, M. / Hays, E. / Hugues, R.E. / Johannesson, G. / Johnson, A.S. / Johnson, R.P. / Johnson, W.N. / Kamae, T. / Katagiri, H. / Kataoka, J. / Kerr, M. / Knödlseder, J. / Kocevski, D. / Kuehn, F. / Kuss, M. / Lande, J. / Latronico, L. / Lemoine-Goumard, M. / Longo, F. / Loparco, F. / Lott, B. / Lovellette, M.N. / Lubrano, P. / Madejski, G. M. / Makeev, A. / Massai, M.M. / Mazziotta, M.N. / Mcconville, W. / Mcenery, J.E. / Meurer, C. / Michelson, P.F. / Mitthumsiri, W. / Mizuno, T. / Moiseev, A.A. / Monte, C. / Monzani, M.E. / Moretti, E. / Morselli, A. / Moskalenko, I.V. / Murgia, S. / Nolan, P.L. / Norris, J.P. / Nuss, E. / Ohsugi, T. / Omodei, N. / Orlando, E. / Ormes, J.F. / Ozaki, M. / Paneque, D. / Panetta, J.H. / Parent, D. / Pelassa, V. / Pepe, M. / Pesce-Rollins, M. / Piron, F. / Pohl, M. / Porter, T.A. / Profumo, S. / Rainò, S. / Rando, R. / Razzano, M. / Reimer, A. / Reimer, O. / Reposeur, T. / Ritz, S. / Rochester, L. S. / Rodriguez, A. Y. / Romani, R.W. / Roth, M. / Ryde, F. / Sadrosinski, H.F-W. / Sanchez, D. / Sander, A. / Saz Parkinson, P.M. / Scargle, J. D. / Schalk, T. L. / Sellerholm, A. / Sgro, G. / Smith, D. A. / Smith, P. D. / Spandre, G. / Spinelli, P. / Starck, Jean-Luc / Stephens, T. E. / Strickman, M.S. / Strong, A.W. / Suson, D. J. / Tajima, H. / Takahashi, H. / Takahashi, T. / Tanaka, T. / Thayer, J. G. / Thompson, D.J. / Tibaldo, L. / Tibolla, O. / Torres, D.F. / Tosti, G. / Tramacere, A. / Uchiyama, Y. / Usher, T. L. / Van Etten, A. / Vasileiou, V. / Vilchez, N. / Vitale, V. / Waite, A. P. / Wallace, E. / Wang, P. / Winer, B. L. / Wood, K. S. / Ylinen, T. / Ziegler, M. - 2009
Designed as a high-sensitivity gamma-ray observatory, the Fermi Large Area Telescope is also an electron detector with a large acceptance exceeding 2 m2 sr at 300 GeV. Building on the gamma-ray analysis, we have developed an efficient electron detection strategy which provides sufficient background rejection for measurement of the steeply falling electron spectrum up to 1 TeV. Our high precision data show that the electron spectrum falls with energy as E-3.0 and does not exhibit prominent spectral features. Interpretations in terms of a conventional diffusive model as well as a potential local extra component are briefly discussed.
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