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

Markus Ackermann Marco Ajello W. B. Atwood Luca Baldini Jean Ballet 1 Guido Barbiellini D. Bastieri B. M. Baughman K. Bechtol F. Bellardi R. Bellazzini F. Belli B. Berenji R. D. Blandford E. D. Bloom J. R. Bogart E. Bonamente A. W. Borgland T. J. Brandt 2 J. Bregeon A. Brez M. Brigida Pascal Bruel 3 R. Buehler T. H. Burnett G. Busetto S. Buson G. A. Caliandro R. A. Cameron P. A. Caraveo P. Carlson S. Carrigan J. M. Casandjian 1 M. Ceccanti C. Cecchi Ö. Çelik E. Charles A. Chekhtman C. C. Cheung J. Chiang A. N. Cillis S. Ciprini R. Claus J. Cohen-Tanugi 4 J. Conrad R. Corbet M. Deklotz C. D. Dermer A. de Angelis F. de Palma S. W. Digel G. Di Bernardo E. Do Couto E Silva P. S. Drell A. Drlica-Wagner R. Dubois D. Fabiani C. Favuzzi S. J. Fegan 3 P. Fortin 3 Y. Fukazawa S. Funk P. Fusco D. Gaggero F. Gargano D. Gasparrini N. Gehrels S. Germani N. Giglietto P. Giommi F. Giordano M. Giroletti T. Glanzman G. Godfrey D. Grasso I. A. Grenier 1 M.-H. Grondin 5 J. E. Grove S. Guiriec M. Gustafsson D. Hadasch A. K. Harding M. Hayashida E. Hays D. Horan 3 R. E. Hughes G. Jóhannesson A. S. Johnson R. P. Johnson W. N. Johnson T. Kamae H. Katagiri J. Kataoka M. Kerr J. Knödlseder 2 M. Kuss J. Lande L. Latronico M. Lemoine-Goumard 5 M. Llena Garde F. Longo F. Loparco B. Lott 5 M. N. Lovellette P. Lubrano A. Makeev M. N. Mazziotta J. E. Mcenery J. Mehault 4 P. F. Michelson M. Minuti W. Mitthumsiri T. Mizuno A. A. Moiseev C. Monte M. E. Monzani E. Moretti A. Morselli I. V. Moskalenko S. Murgia T. Nakamori M. Naumann-Godo 1 P. L. Nolan J. P. Norris E. Nuss 4 T. Ohsugi A. Okumura N. Omodei E. Orlando J. F. Ormes M. Ozaki D. Paneque J. H. Panetta D. Parent 5 V. Pelassa 4 M. Pepe M. Pesce-Rollins V. Petrosian M. Pinchera F. Piron 4 T.A. Porter S. Profumo S. Rainò R. Rando E. Rapposelli M. Razzano A. Reimer O. Reimer T. Reposeur 5 J. Ripken S. Ritz L. S. Rochester R. W. Romani M. Roth H. F.-W. Sadrozinski N. Saggini D. Sanchez 3 A. Sander C. Sgrò E. J. Siskind P. D. Smith G. Spandre P. Spinelli Ł. Stawarz T. E. Stephens M. S. Strickman A. W. Strong D. J. Suson H. Tajima H. Takahashi T. Takahashi T. Tanaka J. B. Thayer J. G. Thayer D. J. Thompson L. Tibaldo 1 O. Tibolla D. F. Torres G. Tosti A. Tramacere M. Turri Y. Uchiyama T. L. Usher J. Vandenbroucke V. Vasileiou N. Vilchez 2 V. Vitale A. P. Waite E. Wallace P. Wang B. L. Winer K. S. Wood Z. Yang T. Ylinen M. Ziegler
Abstract : We present the results of our analysis of cosmic-ray electrons using about 8 million 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 $\propto {\rm E}^{-3.08 \pm 0.05}$ 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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Submitted on : Monday, April 11, 2011 - 5:22:19 PM
Last modification on : Friday, November 27, 2020 - 5:52:10 AM

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Markus Ackermann, Marco Ajello, W. B. Atwood, Luca Baldini, Jean Ballet, et al.. Fermi LAT observations of cosmic-ray electrons from 7 GeV to 1 TeV. Physical Review D, American Physical Society, 2010, 82, pp.092004. ⟨10.1103/PhysRevD.82.092004⟩. ⟨in2p3-00585122⟩

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