Cosmic-ray electron-positron spectrum from 7 GeV to 2 TeV with the Fermi Large Area Telescope

S. Abdollahi 1 M. Ackermann 2 M. Ajello 3 W. Atwood 4 L. Baldini 5 G. Barbiellini 6 D. Bastieri 7 R. Bellazzini 8 E. Bloom 9 R. Bonino 10 T. Brandt 11 J. Bregeon 12 Pascal Bruel 13 R. Buehler 14 A. Cameron 15 R. Caputo 4 M. Caragiulo 8 D. Castro 11 E. Cavazzuti 16 C. Cecchi 17 A. Chekhtman 18 S. Ciprini 16 J. Cohen-Tanugi 12 F. Costanza 5 A. Cuoco 10 S. Cutini 16 F. D’ammando 19 F. de Palma 5 R. Desiante 10 S. Digel 20 N. Di Lalla 21 M. Di Mauro 9 L. Di Venere 8 S. Drell 20 A. Drlica-Wagner 22 C. Favuzzi 8 W. Focke 20 S. Funk 23 P. Fusco 8 F. Gargano 5 D. Gasparrini 16 N. Giglietto 8 F. Giordano 8 M. Giroletti 19 D. Green 11 Lucas Guillemot 24, 25 S. Guiriec 11 A. Harding 26 T. Jogler 27 G. Jóhannesson 28 T. Kamae 29 M. Kuss 5 G. La Mura 7 L. Latronico 10 F. Longo 8 F. Loparco 12 P. Lubrano 17 S. Maldera 10 D. Malyshev 23 A. Manfreda 5 M. Mazziotta 8 P. Michelson 20 N. Mirabal 11 W. Mitthumsiri 30 T. Mizuno 1 A. Moiseev 11 M. Monzani 20 A. Morselli 31 I. v. Moskalenko 9 M. Negro 10 E. Nuss 12 E. Orlando 20 D. Paneque 32 S. Perkins 26 M. Pesce-Rollins 5 F. Piron 12 G. Pivato 5 A. Porter 20 G. Principe 23 S. Rainò 8 R. Rando 33 M. Razzano 21 A. Reimer 34 O. Reimer 35 C. Sgrò 13 D. Simone 8 E. Siskind 36 F. Spada 5 G. Spandre 5 P. Spinelli 8 H. Tajima 37 J. b. Thayer 9 L. Tibaldo 38 D. f. Torres 39 E. Troja 11 M. Wood 20 A. Worley 40 G. Zaharijas 6 S. Zimmer 41
Abstract : We present a measurement of the cosmic-ray electron+positron spectrum between 7 GeV and 2 TeV performed with almost seven years of data collected with the Fermi Large Area Telescope. We find that the spectrum is well fit by a broken power law with a break energy at about 50 GeV. Above 50 GeV, the spectrum is well described by a single power law with a spectral index of 3.07 ± 0.02 (stat+syst) ± 0.04 (energy measurement). An exponential cutoff lower than 1.8 TeV is excluded at 95% CL. PACS numbers: 98.70.Sa, 96.50.sb, 95.85.Ry, 95.55.Vj
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S. Abdollahi, M. Ackermann, M. Ajello, W. Atwood, L. Baldini, et al.. Cosmic-ray electron-positron spectrum from 7 GeV to 2 TeV with the Fermi Large Area Telescope. Physical Review D, American Physical Society, 2017, 95 (8), pp.18-45. ⟨10.1103/PhysRevD.95.082007⟩. ⟨insu-01526468⟩

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