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.
Autori interni: | |
Autori: | Ackermann M; Ajello M; Atwood WB; Baldini L; Ballet J; Barbiellini G; Bastieri D; Baughman BM; Bechtol K; Bellardi F; Bellazzini R; Belli F; Berenji B; Blandford RD; Bloom ED; Bogart JR; Bonamente E; Borgland AW; Brandt TJ; Bregeon J; Brez A; Brigida M; Bruel P; Buehler R; Burnett TH; Busetto G; Buson S; Caliandro GA; Cameron RA; Caraveo PA; Carlson P; Carrigan S; Casandjian JM; Ceccanti M; Cecchi C; Celik O; Charles E; Chekhtman A; Cheung CC; Chiang J; Cillis AN; Ciprini S; Claus R; Cohen-Tanugi J; Conrad J; Corbet R; DeKlotz M; Dermer CD; de Angelis A; de Palma F; Digel SW; Di Bernardo G; Silva EDE; Drell PS; Drlica-Wagner A; Dubois R; Fabiani D; Favuzzi C; Fegan SJ; 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 IA; Grondin MH; Grove JE; Guiriec S; Gustafsson M; Hadasch D; Harding AK; Hayashida M; Hays E; Horan D; Hughes RE; Johannesson G; Johnson AS; Johnson RP; Johnson WN; Kamae T; Katagiri H; Kataoka J; Kerr M; Knodlseder J; Kuss M; Lande J; Latronico L; Lemoine-Goumard M; Garde ML; Longo F; Loparco F; Lott B; Lovellette MN; Lubrano P; Makeev A; Mazziotta MN; McEnery JE; Mehault J; Michelson PF; Minuti M; Mitthumsiri W; Mizuno T; Moiseev AA; Monte C; Monzani ME; Moretti E; Morselli A; Moskalenko IV; Murgia S; Nakamori T; Naumann-Godo M; Nolan PL; Norris JP; Nuss E; Ohsugi T; Okumura A; Omodei N; Orlando E; Ormes JF; Ozaki M; Paneque D; Panetta JH; Parent D; Pelassa V; Pepe M; Pesce-Rollins M; Petrosian V; Pinchera M; Piron F; Porter TA; Profumo S; Raino S; Rando R; Rapposelli E; Razzano M; Reimer A; Reimer O; Reposeur T; Ripken J; Ritz S; Rochester LS; Romani RW; Roth M; Sadrozinski HFW; Saggini N; Sanchez D; Sander A; Sgro C; Siskind EJ; Smith PD; Spandre G; Spinelli P; Stawarz L; Stephens TE; Strickman MS; Strong AW; Suson DJ; Tajima H; Takahashi H; Takahashi T; Tanaka T; Thayer JB; Thayer JG; Thompson DJ; Tibaldo L; Tibolla O; Torres DF; Tosti G; Tramacere A; Turri M; Uchiyama Y; Usher TL; Vandenbroucke J; Vasileiou V; Vilchez N; Vitale V; Waite AP; Wallace E; Wang P; Winer BL; Wood KS; Yang Z; Ylinen T; Ziegler M |
Titolo: | Fermi LAT observations of cosmic-ray electrons from 7 GeV to 1 TeV |
Anno del prodotto: | 2010 |
Digital Object Identifier (DOI): | 10.1103/PhysRevD.82.092004 |
Appare nelle tipologie: | 1.1 Articolo in rivista |