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Measurement of the Cosmic Ray e(+)+e(-) Spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope

A.A. Abdo Markus Ackermann Marco Ajello W. B. Atwood Magnus Axelsson Luca Baldini Jean Ballet 1 Guido Barbiellini D. Bastieri M. Battelino B.M. Baughmann K. Bechtol R. Bellazzini B. Berenji R. D. Blandford E.D. Bloom G. Bogaert 2 E. Bonamente A.W. Borgland J. Bregeon A. Brez M. Brigida Pascal Bruel 2 T.H. Burnett G. A.Caliandro R.A. Cameron P. A. Caraveo P. Carlson J.M. Casandjian 1 C. Cecchi E. Charles A. Chekhtman C.C. Cheung J. Chiang S. Ciprini R. Claus J. Cohen-Tanugi 3 L.R. Cominski J. Conrad S. Cutini C. D. Dermer A. de Angelis F. de Palma S.W. Digel G. Di Bernardo E.D.E. Silva P.S. Drell R. Dubois D. Dumora 4 Y. Edmonds C. Farnier 3 C. Favuzzi W.B. Focke M. Frailis Y. Fukazawa S. Funk P. Fusco D. Gaggero F. Gargano D. Gasparrini N. Gehrels S. Germani B. Giebels 2 N. Giglietto F. Giordano T. Glanzman G. Godfrey D. Grasso I.A. Grenier 1 M.-H. Grondin 4 J.E. Grove L. Guillemot 4 S. Guiriec 3 Y. Hanabata A.K. Harding R.C. Hartman M. Hayashida E. Hays R.E. Hugues G. Johannesson A.S. Johnson R.P. Johnson W.N. Johnson T. Kamae H. Katagiri J. Kataoka M. Kerr J. Knödlseder 5 D. Kocevski F. Kuehn M. Kuss J. Lande L. Latronico M. Lemoine-Goumard 4 F. Longo F. Loparco B. Lott 4 M.N. Lovellette P. Lubrano G. M. Madejski A. Makeev M.M. Massai M.N. Mazziotta W. Mcconville J.E. Mcenery C. Meurer P.F. Michelson W. Mitthumsiri T. Mizuno A.A. Moiseev C. Monte M.E. Monzani E. Moretti A. Morselli I.V. Moskalenko S. Murgia P.L. Nolan J.P. Norris E. Nuss 3 T. Ohsugi N. Omodei E. Orlando J.F. Ormes M. Ozaki D. Paneque J.H. Panetta D. Parent 4 V. Pelassa 3 M. Pepe M. Pesce-Rollins F. Piron 3 M. Pohl T.A. Porter S. Profumo S. Rainò R. Rando M. Razzano A. Reimer O. Reimer T. Reposeur 4 S. Ritz L. S. Rochester A. Y. Rodriguez R.W. Romani M. Roth F. Ryde H.F-W. Sadrosinski D. Sanchez 2 A. Sander P.M. Saz Parkinson J. D. Scargle T. L. Schalk A. Sellerholm G. Sgro D. A. Smith 4 P. D. Smith G. Spandre P. Spinelli Jean-Luc Starck 1 T. E. Stephens M.S. Strickman A.W. Strong D. J. Suson H. Tajima H. Takahashi T. Takahashi T. Tanaka J. G. Thayer D.J. Thompson L. Tibaldo O. Tibolla D.F. Torres G. Tosti A. Tramacere Y. Uchiyama T. L. Usher A. van Etten V. Vasileiou N. Vilchez 5 V. Vitale A. P. Waite E. Wallace P. Wang B. L. Winer K. S. Wood T. Ylinen M. Ziegler
Abstract : 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.
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Submitted on : Monday, June 8, 2009 - 10:22:19 AM
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A.A. Abdo, Markus Ackermann, Marco Ajello, W. B. Atwood, Magnus Axelsson, et al.. Measurement of the Cosmic Ray e(+)+e(-) Spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope. Physical Review Letters, American Physical Society, 2009, 102, pp.181101. ⟨10.1103/PhysRevLett.102.181101⟩. ⟨in2p3-00392444⟩

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