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Fermi LAT observations of cosmic-ray electrons from 7 GeV to 1 TeV

2010; American Physical Society; Volume: 82; Issue: 9 Linguagem: Inglês

10.1103/physrevd.82.092004

1550-7998

M. Ackermann, M. Ajello, W. B. Atwood, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, B. M. Baughman, K. Bechtol, F. Bellardi, R. Bellazzini, F. Belli, B. Berenji, R. D. Blandford, E. D. Bloom, J. R. Bogart, E. Bonamente, A. W. Borgland, T. J. Brandt, J. Bregeon, A. Brez, M. Brigida, P. Bruel, R. Buehler, T. H. Burnett, G. Busetto, S. Buson, G. A. Caliandro, R. A. Cameron, P. A. Caraveo, P. Carlson, S. Carrigan, J. M. Casandjian, M. Ceccanti, C. Cecchi, Ö. Çelik, E. Charles, A. Chekhtman, C. C. Cheung, J. Chiang, A. Cillis, S. Ciprini, R. Claus, J. Cohen-Tanugi, J. M. Conrad, R. Corbet, M. DeKlotz, C. D. Dermer, A. De Angelis, F. de Palma, S. W. Digel, Giuseppe Di Bernardo, E. do Couto e Silva, P. S. Drell, A. Drlica-Wagner, R. Dubois, D. Fabiani, C. Favuzzi, S. Fegan, P. Fortin, Y. Fukazawa, S. Funk, P. Fusco, Daniele Gaggero, F. Gargano, D. Gasparrini, N. Gehrels, S. Germani, N. Giglietto, P. Giommi, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, Dario Grasso, I. A. Grenier, M.-H. Grondin, J. E. Grove, S. Guiriec, M. Gustafsson, D. Hadasch, A. K. Harding, M. Hayashida, E. Hays, D. Horan, R. E. Hughes, G. Jóhannesson, A. S. Johnson, R. P. Johnson, W. N. Johnson, T. Kamae, H. Katagiri, J. Kataoka, M. Kerr, J. Knödlseder, M. Kuss, J. Landé, L. Latronico, M. Lemoine‐Goumard, M. Llena Garde, F. Longo, F. Loparco, B. Lott, M. N. Lovellette, P. Lubrano, A. Makeev, M. N. Mazziotta, J. E. McEnery, J. Méhault, P. F. Michelson, M. Minuti, W. Mitthumsiri, Tsunefumi Mizuno, A. A. Moiseev, C. Monte, M. E. Monzani, E. Moretti, A. Morselli, I. V. Moskalenko, S. Murgia, Takeshi Nakamori, M. Naumann-Godó, P. L. Nolan, J. P. Norris, E. Nuss, T. Ohsugi, A. Okumura, N. Omodei, E. Orlando, J. F. Ormes, Masanori Ozaki, D. Paneque, J. Panetta, D. Parent, V. Pelassa, M. Pepé, M. Pesce-Rollins, V. Petrosian, Michele Pinchera, F. Piron, T. A. Porter, Stefano Profumo, S. Rainò, R. Rando, E. Rapposelli, M. Razzano, A. Reimer, O. Reimer, T. Reposeur, J. Ripken, S. Ritz, Lynn Rochester, Roger W. Romani, M. Roth, H. F-W. Sadrozinski, N. Saggini, D. A. Sánchez, A. Sander, C. Sgrò, E. J. Siskind, P. D. Smith, G. Spandre, P. Spinelli, Ł. Stawarz, T. E. Stephens, M. S. Strickman, A. W. Strong, D. J. Suson, H. Tajima, H. Takahashi, T. Takahashi, T. Tanaka, J. B. Thayer, J. G. Thayer, D. J. Thompson, L. Tibaldo, O. Tibolla, D. F. Torres, G. Tosti, A. Tramacere, M. Turri, Y. Uchiyama, T. Usher, J. Vandenbroucke, V. Vasileiou, N. Vilchez, V. Vitale, A. P. Waite, E. Wallace, P. Wang, B. L. Winer, K. S. Wood, Z. Yang, T. Ylinen, M. Ziegler,

Particle Detector Development and Performance

We present the results of our analysis of cosmic-ray electrons using about $8\ifmmode\times\else\texttimes\fi{}{10}^{6}$ electron candidates detected in the first 12 months on-orbit by the Fermi Large Area Telescope. This work extends our previously published cosmic-ray electron spectrum down to 7 GeV, giving a spectral range of approximately 2.5 decades up to 1 TeV. We describe in detail the analysis and its validation using beam-test and on-orbit data. In addition, we describe the spectrum measured via a subset of events selected for the best energy resolution as a cross-check on the measurement using the full event sample. Our electron spectrum can be described with a power law $\ensuremath{\propto}{\mathrm{E}}^{\ensuremath{-}3.08\ifmmode\pm\else\textpm\fi{}0.05}$ with no prominent spectral features within systematic uncertainties. Within the limits of our uncertainties, we can accommodate a slight spectral hardening at around 100 GeV and a slight softening above 500 GeV.