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

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

We present the results of our analysis of cosmic-ray electrons using about 8×106 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 approxima...

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Bibliographic Details
Main Authors: Ackermann, M., Ajello, M., Atwood, W., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Baughman, B., Bechtol, K., Bellardi, F., Bellazzini, R., Belli, F., Berenji, B., Blandford, R., Bloom, E., Bogart, J., Bonamente, E., Borgland, A., Brandt, T., Bregeon, J., Brez, A., Brigida, M., Bruel, P., Buehler, R., Burnett, T., Busetto, G., Buson, S., Caliandro, G., Cameron, R., Caraveo, P., Carlson, P., Carrigan, S., Casandjian, J., Ceccanti, M., Cecchi, C., Celik, O., Charles, E., Chekhtman, A., Cheung, C., Chiang, J., Cillis, A., Ciprini, S., Claus, R., Cohen-Tanugi, J., Conrad, J., Corbet, R., DeKlotz, M., Dermer, C., de Angelis, A., de Palma, F., Digel, S., Di Bernardo, G., Do Couto e Silva, E., Drell, P., Drlica-Wagner, A., Dubois, R., Fabiani, D., Favuzzi, C., Fegan, S., Fortin, P., Fukazawa, Y., Funk, S., Fusco, P., Gaggero, D., Gargano, F., Gasparrini, D., Gehrels, N., Germani, S., Giglietto, N., Giommi, P., Giordano, F., Giroletti, M., Glanzman, T., Godfrey, G., Grasso, D., Grenier, I., Grondin, M., Grove, J., Guiriec, S., Gustafsson, M., Hadasch, D., Harding, A., Hayashida, M., Hays, E., Horan, D., Hughes, R., Johannesson, G., Johnson, A., Johnson, R., Johnson, W., Kamae, T., Katagiri, H., Kataoka, J., Kerr, M., Knödlseder, J., Kuss, M., Lande, J., Latronico, L., Lemoine-Goumard, M., Llena Garde, M., Longo, F., Loparco, F., Lott, B., Lovellette, M., Lubrano, P., Makeev, A., Mazziotta, M., McEnery, J., Mehault, J., Michelson, P., Minuti, M., Mitthumsiri, W., Mizuno, T., Moiseev, A., Monte, C., Monzani, M., Moretti, E., Morselli, A., Moskalenko, I., Murgia, S., Nakamori, T., Naumann-Godo, M., Nolan, P., Norris, J., Nuss, E., Ohsugi, T., Okumura, A., Omodei, N., Orlando, E., Ormes, J., Ozaki, M., Paneque, D., Panetta, J., Parent, D., Pelassa, V., Pepe, M., Pesce-Rollins, M., Petrosian, V., Pinchera, M., Piron, F., Porter, T., Profumo, S., Raino, S., Rando, R., Rapposelli, E., Razzano, M., Reimer, A., Reimer, O., Reposeur, T., Ripken, J., Ritz, S., Rochester, L., Romani, R., Roth, M., Sadrozinski, H., Saggini, N., Sanchez, D., Sander, A., Sgro, C., Siskind, E., Smith, P., Spandre, G., Spinelli, P., Stawarz, L., Stephens, T., Strickman, M., Strong, A., Suson, D., Tajima, H., Takahashi, H., Takahashi, T., Tanaka, T., Thayer, J., Thompson, D., Tibaldo, L., Tibolla, Omar, Torres, D., Tosti, G., Tramacere, A., Turri, M., Uchiyama, Y., Usher, T., Vandenbroucke, J., Vasileiou, V., Vilchez, N., Vitale, V., Waite, A., Wallace, E., Wang, P., Winer, B., Wood, K., Yang, Z., Ylinen, T., Ziegler, M.
Format: Journal Article
Published: American Physical Society 2010
Online Access:http://adsabs.harvard.edu/abs/2010PhRvD..82i2004A
http://hdl.handle.net/20.500.11937/43511
Description
Summary:We present the results of our analysis of cosmic-ray electrons using about 8×106 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 ?E-3.08±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.

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