APS » Phys. Rev. Lett. » Volume 102 » Issue 18

A. A. Abdo,^1,2 M. Ackermann,³ M. Ajello,³ W. B. Atwood,⁴ M. Axelsson,^5,6 L. Baldini,⁷ J. Ballet,⁸ G. Barbiellini,^9,10 D. Bastieri,^11,12 M. Battelino,^5,13 B. M. Baughman,¹⁴ K. Bechtol,³ R. Bellazzini,⁷ B. Berenji,³ R. D. Blandford,³ E. D. Bloom,³ G. Bogaert,¹⁵ E. Bonamente,^16,17 A. W. Borgland,³ J. Bregeon,⁷ A. Brez,⁷ M. Brigida,^18,19 P. Bruel,¹⁵ T. H. Burnett,²⁰ G. A. Caliandro,^18,19 R. A. Cameron,³ P. A. Caraveo,²¹ P. Carlson,^5,13 J. M. Casandjian,⁸ C. Cecchi,^16,17 E. Charles,³ A. Chekhtman,^22,2 C. C. Cheung,²³ J. Chiang,³ S. Ciprini,^16,17 R. Claus,³ J. Cohen-Tanugi,²⁴ L. R. Cominsky,²⁵ J. Conrad,^5,13,26,27 S. Cutini,²⁸ C. D. Dermer,² A. de Angelis,²⁹ F. de Palma,^18,19 S. W. Digel,³ G. Di Bernardo,⁷ E. do Couto e Silva,³ P. S. Drell,³ R. Dubois,³ D. Dumora,^30,31 Y. Edmonds,³ C. Farnier,²⁴ C. Favuzzi,^18,19 W. B. Focke,³ M. Frailis,²⁹ Y. Fukazawa,³² S. Funk,³ P. Fusco,^18,19 D. Gaggero,⁷ F. Gargano,¹⁹ D. Gasparrini,²⁸ N. Gehrels,^23,33 S. Germani,^16,17 B. Giebels,¹⁵ N. Giglietto,^18,19 F. Giordano,^18,19 T. Glanzman,³ G. Godfrey,³ D. Grasso,⁷ I. A. Grenier,⁸ M.-H. Grondin,^30,31 J. E. Grove,² L. Guillemot,^30,31 S. Guiriec,³⁴ Y. Hanabata,³² A. K. Harding,²³ R. C. Hartman,²³ M. Hayashida,³ E. Hays,²³ R. E. Hughes,¹⁴ G. Jóhannesson,³ A. S. Johnson,³ R. P. Johnson,⁴ W. N. Johnson,² T. Kamae,³ H. Katagiri,³² J. Kataoka,³⁵ N. Kawai,^36,37 M. Kerr,²⁰ J. Knödlseder,³⁸ D. Kocevski,³ F. Kuehn,¹⁴ M. Kuss,⁷ J. Lande,³ L. Latronico,⁷ M. Lemoine-Goumard,^30,31 F. Longo,^9,10 F. Loparco,^18,19 B. Lott,^30,31 M. N. Lovellette,² P. Lubrano,^16,17 G. M. Madejski,³ A. Makeev,^22,2 M. M. Massai,⁷ M. N. Mazziotta,¹⁹ W. McConville,^23,33 J. E. McEnery,²³ C. Meurer,^5,26 P. F. Michelson,³ W. Mitthumsiri,³ T. Mizuno,³² A. A. Moiseev,^39,33 C. Monte,^18,19 M. E. Monzani,³ E. Moretti,^9,10 A. Morselli,⁴⁰ I. V. Moskalenko,³ S. Murgia,³ P. L. Nolan,³ J. P. Norris,⁴¹ E. Nuss,²⁴ T. Ohsugi,³² N. Omodei,⁷ E. Orlando,⁴² J. F. Ormes,⁴¹ M. Ozaki,⁴³ D. Paneque,³ J. H. Panetta,³ D. Parent,^30,31 V. Pelassa,²⁴ M. Pepe,^16,17 M. Pesce-Rollins,⁷ F. Piron,²⁴ M. Pohl,⁴⁴ T. A. Porter,⁴ S. Profumo,⁴ S. Rainò,^18,19 R. Rando,^11,12 M. Razzano,⁷ A. Reimer,³ O. Reimer,³ T. Reposeur,^30,31 S. Ritz,^23,33 L. S. Rochester,³ A. Y. Rodriguez,⁴⁵ R. W. Romani,³ M. Roth,²⁰ F. Ryde,^5,13 H. F.-W. Sadrozinski,⁴ D. Sanchez,¹⁵ A. Sander,¹⁴ P. M. Saz Parkinson,⁴ J. D. Scargle,⁴⁶ T. L. Schalk,⁴ A. Sellerholm,^5,26 C. Sgrò,⁷ D. A. Smith,^30,31 P. D. Smith,¹⁴ G. Spandre,⁷ P. Spinelli,^18,19 J.-L. Starck,⁸ T. E. Stephens,²³ M. S. Strickman,² A. W. Strong,⁴² D. J. Suson,⁴⁷ H. Tajima,³ H. Takahashi,³² T. Takahashi,⁴³ T. Tanaka,³ J. B. Thayer,³ J. G. Thayer,³ D. J. Thompson,²³ L. Tibaldo,^11,12 O. Tibolla,⁴⁸ D. F. Torres,^49,45 G. Tosti,^16,17 A. Tramacere,^50,3 Y. Uchiyama,³ T. L. Usher,³ A. Van Etten,³ V. Vasileiou,^23,51 N. Vilchez,³⁸ V. Vitale,^40,52 A. P. Waite,³ E. Wallace,²⁰ P. Wang,³ B. L. Winer,¹⁴ K. S. Wood,² T. Ylinen,^53,5,13 and M. Ziegler⁴

(Fermi LAT Collaboration)

¹National Research Council Research Associate
²Space Science Division, Naval Research Laboratory, Washington, D.C. 20375, USA
³W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, California 94305, USA
⁴Santa Cruz Institute for Particle Physics, Department of Physics and Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, California 95064, USA
⁵The Oskar Klein Centre for Cosmo Particle Physics, AlbaNova, SE-106 91 Stockholm, Sweden
⁶Department of Astronomy, Stockholm University, SE-106 91 Stockholm, Sweden
⁷Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa, Italy
⁸Laboratoire AIM, CEA-IRFU/CNRS/Université Paris Diderot, Service d'Astrophysique, CEA Saclay, 91191 Gif sur Yvette, France
⁹Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, I-34127 Trieste, Italy
¹⁰Dipartimento di Fisica, Università di Trieste, I-34127 Trieste, Italy
¹¹Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova, Italy
¹²Dipartimento di Fisica “G. Galilei”, Università di Padova, I-35131 Padova, Italy
¹³Department of Physics, Royal Institute of Technology (KTH), AlbaNova, SE-106 91 Stockholm, Sweden
¹⁴Department of Physics, Center for Cosmology and Astro-Particle Physics, The Ohio State University, Columbus, Ohio 43210, USA
¹⁵Laboratoire Leprince-Ringuet, École polytechnique, CNRS/IN2P3, Palaiseau, France
¹⁶Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia, Italy
¹⁷Dipartimento di Fisica, Università degli Studi di Perugia, I-06123 Perugia, Italy
¹⁸Dipartimento di Fisica, “M. Merlin” dell'Università e del Politecnico di Bari, I-70126 Bari, Italy
¹⁹Istituto Nazionale di Fisica Nucleare, Sezione di Bari, 70126 Bari, Italy
²⁰Department of Physics, University of Washington, Seattle, Washington 98195-1560, USA
²¹INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica, I-20133 Milano, Italy
²²George Mason University, Fairfax, Virginia 22030, USA
²³NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA
²⁴Laboratoire de Physique Théorique et Astroparticules, Université Montpellier 2, CNRS/IN2P3, Montpellier, France
²⁵Department of Physics and Astronomy, Sonoma State University, Rohnert Park, California 94928-3609, USA
²⁶Department of Physics, Stockholm University, AlbaNova, SE-106 91 Stockholm, Sweden
²⁷Royal Swedish Academy of Sciences Research Fellow, funded by a grant from the K. A. Wallenberg Foundation
²⁸Agenzia Spaziale Italiana (ASI) Science Data Center, I-00044 Frascati (Roma), Italy
²⁹Dipartimento di Fisica, Università di Udine and Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, Gruppo Collegato di Udine, I-33100 Udine, Italy
³⁰CNRS/IN2P3, Centre d'Études Nucléaires Bordeaux Gradignan, UMR 5797, Gradignan, 33175, France
³¹Université de Bordeaux, Centre d'Études Nucléaires Bordeaux Gradignan, UMR 5797, Gradignan, 33175, France
³²Department of Physical Sciences, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
³³University of Maryland, College Park, Maryland 20742, USA
³⁴University of Alabama in Huntsville, Huntsville, Alabama 35899, USA
³⁵Waseda University, 1-104 Totsukamachi, Shinjuku-ku, Tokyo, 169-8050, Japan
³⁶Cosmic Radiation Laboratory, Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan
³⁷Department of Physics, Tokyo Institute of Technology, Meguro City, Tokyo 152-8551, Japan
³⁸Centre d'Étude Spatiale des Rayonnements, CNRS/UPS, BP 44346, F-30128 Toulouse Cedex 4, France
³⁹Center for Research and Exploration in Space Science and Technology (CRESST), NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA
⁴⁰Istituto Nazionale di Fisica Nucleare, Sezione di Roma “Tor Vergata”, I-00133 Roma, Italy
⁴¹Department of Physics and Astronomy, University of Denver, Denver, Colorado 80208, USA
⁴²Max-Planck Institut für extraterrestrische Physik, 85748 Garching, Germany
⁴³Institute of Space and Astronautical Science, JAXA, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan
⁴⁴Iowa State University, Department of Physics and Astronomy, Ames, Iowa 50011-3160, USA
⁴⁵Institut de Ciencies de l'Espai (IEEC-CSIC), Campus UAB, 08193 Barcelona, Spain
⁴⁶Space Sciences Division, NASA Ames Research Center, Moffett Field, California 94035-1000, USA
⁴⁷Department of Chemistry and Physics, Purdue University Calumet, Hammond, Indiana 46323-2094, USA
⁴⁸Max-Planck-Institut für Kernphysik, D-69029 Heidelberg, Germany
⁴⁹Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, Spain
⁵⁰Consorzio Interuniversitario per la Fisica Spaziale (CIFS), I-10133 Torino, Italy
⁵¹University of Maryland, Baltimore County, Baltimore, Maryland 21250, USA
⁵²Dipartimento di Fisica, Università di Roma “Tor Vergata”, I-00133 Roma, Italy
⁵³School of Pure and Applied Natural Sciences, University of Kalmar, SE-391 82 Kalmar, Sweden

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.

©2009 The American Physical Society

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