Measurement of separate cosmic-ray electron and positron spectra with the Fermi Large Area Telescope

Markus Ackermann; Marco Ajello; A. Allafort; W. B. Atwood; Luca Baldini; Guido Barbiellini; D. Bastieri; K. Bechtol; R. Bellazzini; B. Berenji; R. D. Blandford; E. D. Bloom; E. Bonamente; A.W. Borgland; A. Bouvier; J. Bregeon; M. Brigida; Pascal Bruel; R. Buehler; S. Buson; G. A. Caliandro; R. A. Cameron; P. A. Caraveo; J. M. Casandjian; C. Cecchi; E. Charles; A. Chekhtman; C. C. Cheung; J. Chiang; S. Ciprini; R. Claus; J. Cohen-Tanugi; J. Conrad; S. Cutini; A. de Angelis; F. de Palma; C. D. Dermer; S.W. Digel; E. Do Couto E Silva; P. S. Drell; A. Drlica-Wagner; C. Favuzzi; S. J. Fegan; E. C. Ferrara; W. B. Focke; P. Fortin; Y. Fukazawa; S. Funk; P. Fusco; F. Gargano; D. Gasparrini; S. Germani; N. Giglietto; P. Giommi; F. Giordano; M. Giroletti; T. Glanzman; G. Godfrey; I. A. Grenier; J. E. Grove; S. Guiriec; M. Gustafsson; D. Hadasch; A. K. Harding; M. Hayashida; R. E. Hughes; G. Jo'Hannesson; A. S. Johnson; T. Kamae; H. Katagiri; J. Kataoka; Jürgen Knödlseder; M. Kuss; J. Lande; L. Latronico; M. Lemoine-Goumard; M. Llena Garde; F. Longo; F. Loparco; M. N. Lovellette; P. Lubrano; G. M. Madejski; M. N. Mazziotta; J. E. Mcenery; P. F. Michelson; W. Mitthumsiri; T. Mizuno; A. A. Moiseev; C. Monte; M. E. Monzani; A. Morselli; I.V. Moskalenko; S. Murgia; T. Nakamori; P. L. Nolan; J. P. Norris; E. Nuss; M. Ohno; T. Ohsugi; A. Okumura; N. Omodei; E. Orlando; J. F. Ormes; M. Ozaki; D. Paneque; D. Parent; M. Pesce-Rollins; M. Pierbattista; F. Piron; G. Pivato; T.A. Porter; S. Raino'; R. Rando; M. Razzano; S. Razzaque; A. Reimer; O. Reimer; T. Reposeur; S. Ritz; R.W. Romani; M. Roth; H. F.-W. Sadrozinski; C. Sbarra; T. L. Schalk; C. Sgro'; E. J. Siskind; G. Spandre; P. Spinelli; A.W. Strong; H. Takahashi; T. Takahashi; T. Tanaka; J. G. Thayer; J. B. Thayer; L. Tibaldo; M. Tinivella; D. F. Torres; G. Tosti; E. Troja; Y. Uchiyama; T. L. Usher; J. Vandenbroucke; V. Vasileiou; G. Vianello; V. Vitale; A. P. Waite; B. L. Winer; K. S. Wood; M. Wood; Z. Yang; S. Zimmer

doi:10.1103/PhysRevLett.108.011103

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Measurement of separate cosmic-ray electron and positron spectra with the Fermi Large Area Telescope

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Measurement of separate cosmic-ray electron and positron spectra with the Fermi Large Area Telescope

Markus Ackermann, Marco Ajello, A. Allafort, W. B. Atwood, Luca Baldini, Guido Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, B. Berenji, …

Physical Review Letters, Vol.108

05/01/2012

DOI: https://doi.org/10.1103/PhysRevLett.108.011103

Abstract

We measured separate cosmic-ray electron and positron spectra with the Fermi Large Area Telescope. Because the instrument does not have an onboard magnet, we distinguish the two species by exploiting the Earth's shadow, which is offset in opposite directions for opposite charges due to the Earth's magnetic field. We estimate and subtract the cosmic-ray proton background using two different methods that produce consistent results. We report the electron-only spectrum, the positron-only spectrum, and the positron fraction between 20 GeV and 200 GeV. We confirm that the fraction rises with energy in the 20--100 GeV range and determine for the first time that it continues to rise between 100 and 200 GeV.

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Title: Measurement of separate cosmic-ray electron and positron spectra with the Fermi Large Area Telescope
Creators - without role: Markus Ackermann - Deutsches Elektronen-Synchrotron DESY
Marco Ajello - Stanford University
A. Allafort - Kavli Institute for Particle Astrophysics and Cosmology
W. B. Atwood - Santa Cruz Institute for Particle Physics
Luca Baldini - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
Guido Barbiellini - University of Trieste
D. Bastieri - University of Padua
K. Bechtol - Kavli Institute for Particle Astrophysics and Cosmology
R. Bellazzini - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
B. Berenji - Stanford University
R. D. Blandford - Kavli Institute for Particle Astrophysics and Cosmology
E. D. Bloom - Kavli Institute for Particle Astrophysics and Cosmology
E. Bonamente - University of Perugia
A.W. Borgland - Stanford University
A. Bouvier - University of California, Santa Cruz
J. Bregeon - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
M. Brigida - Polytechnic University of Bari
Pascal Bruel - École Polytechnique
R. Buehler - Kavli Institute for Particle Astrophysics and Cosmology
S. Buson - University of Padua
G. A. Caliandro - Institut de Ciencies de l'Espai [Barcelona]
R. A. Cameron - Kavli Institute for Particle Astrophysics and Cosmology
P. A. Caraveo - Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
J. M. Casandjian - Astrophysique Interprétation Modélisation
C. Cecchi - University of Perugia
E. Charles - Kavli Institute for Particle Astrophysics and Cosmology
A. Chekhtman - Artep
C. C. Cheung - National Research Council Washington
J. Chiang - Kavli Institute for Particle Astrophysics and Cosmology
S. Ciprini - University of Perugia
R. Claus - Kavli Institute for Particle Astrophysics and Cosmology
J. Cohen-Tanugi - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
J. Conrad - Stockholm University
S. Cutini - Agenzia Spaziale Italiana
A. de Angelis - Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
F. de Palma - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
C. D. Dermer - Space Science Division [Washington]
S.W. Digel - Kavli Institute for Particle Astrophysics and Cosmology
E. Do Couto E Silva - Kavli Institute for Particle Astrophysics and Cosmology
P. S. Drell - Kavli Institute for Particle Astrophysics and Cosmology
A. Drlica-Wagner - Kavli Institute for Particle Astrophysics and Cosmology
C. Favuzzi - Polytechnic University of Bari
S. J. Fegan - Laboratoire Leprince-Ringuet
E. C. Ferrara - Goddard Space Flight Center
W. B. Focke - Kavli Institute for Particle Astrophysics and Cosmology
P. Fortin - Centre National de la Recherche Scientifique
Y. Fukazawa - Hiroshima University
S. Funk - Stanford University
P. Fusco - Polytechnic University of Bari
F. Gargano - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
D. Gasparrini - Agenzia Spaziale Italiana
S. Germani - University of Perugia
N. Giglietto - Polytechnic University of Bari
P. Giommi - Agenzia Spaziale Italiana
F. Giordano - Polytechnic University of Bari
M. Giroletti - Istituto di Radioastronomia di Bologna
T. Glanzman - Stanford University
G. Godfrey - Kavli Institute for Particle Astrophysics and Cosmology
I. A. Grenier - Astrophysique Interprétation Modélisation
J. E. Grove - Space Science Division [Washington]
S. Guiriec - University of Alabama in Huntsville
M. Gustafsson - Istituto Nazionale di Fisica Nucleare, Sezione di Padova
D. Hadasch - Institute of Space Sciences
A. K. Harding - Space Science Division [Washington]
M. Hayashida - Kavli Institute for Particle Astrophysics and Cosmology
R. E. Hughes - Center for Cosmology & AstroParticle Physics
G. Jo'Hannesson - University of Iceland
A. S. Johnson - Kavli Institute for Particle Astrophysics and Cosmology
T. Kamae - Stanford University
H. Katagiri - Ibaraki University
J. Kataoka - Waseda University
Jürgen Knödlseder - Université de Toulouse
M. Kuss - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
J. Lande - Kavli Institute for Particle Astrophysics and Cosmology
L. Latronico - Istituto Nazionale di Fisica Nucleare, Sezione di Torino
M. Lemoine-Goumard - Centre National de la Recherche Scientifique
M. Llena Garde - Stockholm University
F. Longo - University of Trieste
F. Loparco - Polytechnic University of Bari
M. N. Lovellette - Naval Research Laboratory
P. Lubrano - University of Perugia
G. M. Madejski - Kavli Institute for Particle Astrophysics and Cosmology
M. N. Mazziotta - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
J. E. Mcenery - Goddard Space Flight Center
P. F. Michelson - Kavli Institute for Particle Astrophysics and Cosmology
W. Mitthumsiri - Stanford University
T. Mizuno - Hiroshima University
A. A. Moiseev - Department of Mathematics [College Park]
C. Monte - Polytechnic University of Bari
M. E. Monzani - Kavli Institute for Particle Astrophysics and Cosmology
A. Morselli - Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
I.V. Moskalenko - Stanford University
S. Murgia - Kavli Institute for Particle Astrophysics and Cosmology
T. Nakamori - Waseda University
P. L. Nolan - Kavli Institute for Particle Astrophysics and Cosmology
J. P. Norris
E. Nuss - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
M. Ohno - Institute of Space and Astronautical Science
T. Ohsugi - Hiroshima University
A. Okumura - Institute of Space and Astronautical Science
N. Omodei - Kavli Institute for Particle Astrophysics and Cosmology
E. Orlando - Kavli Institute for Particle Astrophysics and Cosmology
J. F. Ormes
M. Ozaki - Institute of Space and Astronautical Science
D. Paneque - Kavli Institute for Particle Astrophysics and Cosmology
D. Parent - George Mason University
M. Pesce-Rollins - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
M. Pierbattista - Astrophysique, Instrumentation et Modélisation
F. Piron - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
G. Pivato - University of Padua
T.A. Porter - Kavli Institute for Particle Astrophysics and Cosmology
S. Raino'
R. Rando - University of Padua
M. Razzano - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
S. Razzaque - George Mason University
A. Reimer - Kavli Institute for Particle Astrophysics and Cosmology
O. Reimer - Stanford University
T. Reposeur - Laboratoire de Physique des deux infinis Bordeaux
S. Ritz - University of California, Santa Cruz
R.W. Romani - Kavli Institute for Particle Astrophysics and Cosmology
M. Roth - University of Washington
H. F.-W. Sadrozinski
C. Sbarra - Istituto Nazionale di Fisica Nucleare, Sezione di Padova
T. L. Schalk
C. Sgro'
E. J. Siskind
G. Spandre - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
P. Spinelli - Polytechnic University of Bari
A.W. Strong - Max Planck Institute for Extraterrestrial Physics
H. Takahashi - Hiroshima University
T. Takahashi - Institute of Space and Astronautical Science
T. Tanaka - SLAC National Accelerator Laboratory
J. G. Thayer - Kavli Institute for Particle Astrophysics and Cosmology
J. B. Thayer - Kavli Institute for Particle Astrophysics and Cosmology
L. Tibaldo - University of Padua
M. Tinivella - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
D. F. Torres
G. Tosti - University of Perugia
E. Troja - Goddard Space Flight Center
Y. Uchiyama - Stanford University
T. L. Usher - Kavli Institute for Particle Astrophysics and Cosmology
J. Vandenbroucke - Kavli Institute for Particle Astrophysics and Cosmology
V. Vasileiou - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
G. Vianello - Consorzio Interuniversitario Fisica Spaziale
V. Vitale - Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
A. P. Waite - Kavli Institute for Particle Astrophysics and Cosmology
B. L. Winer - Center for Cosmology & AstroParticle Physics
K. S. Wood - Naval Research Laboratory
M. Wood - Kavli Institute for Particle Astrophysics and Cosmology
Z. Yang - AlbaNova
S. Zimmer - AlbaNova
Publication Details: Physical Review Letters, Vol.108
Identifiers: 9938793909311
Academic Unit: Laboratoire Univers et Particules de Montpellier - LUPM
Language: English
Resource Type: Journal article
Local Fields: in2p3-00665926