Measurement of the Cosmic Ray e(+)+e(-) Spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope Auteur(s): Abdo A.A., Ackermann M., Ajello M., B. Atwood W., Axelsson M., Baldini L., Ballet J., Bogaert G., Bruel P., Casandjian J.M., Cohen-Tanugi J., Dumora D., Farnier C., Giebels B., Grenier I.A., Grondin M.-H., Guillemot L., Guiriec Sylvain, Knödlseder J., Lemoine-Goumard M., Lott B., Nuss E., Parent D., Pelassa V., Piron F., Reposeur T., Sanchez D., Smith D. A., Starck J.-L., Vilchez N. (Article) Publié: Physical Review Letters, vol. 102 p.181101 (2009) Texte intégral en Openaccess : Ref HAL: in2p3-00392444_v1 DOI: 10.1103/PhysRevLett.102.181101 Exporter : BibTex | endNote 775 citations Résumé: 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. |