Inferred Cosmic-Ray Spectrum from Fermi Large Area Telescope γ-Ray Observations of Earth’s Limb

M. Ackermann; M. Ajello; A. Albert; A. Allafort; L. Baldini; G. Barbiellini; D. Bastieri; K. Bechtol; R. Bellazzini; R.D. Blandford; E.D. Bloom; E. Bonamente; E. Bottacini; A. Bouvier; T.J. Brandt; M. Brigida; P. Bruel; R. Buehler; S. Buson; G.A. Caliandro; R.A. Cameron; P.A. Caraveo; C. Cecchi; E. Charles; R.C.G. Chaves; A. Chekhtman; J. Chiang; G. Chiaro; S. Ciprini; R. Claus; J. Cohen-Tanugi; J. Conrad; S. Cutini; M. Dalton; F. d'Ammando; A. de Angelis; F. de Palma; C.D. Dermer; S.W. Digel; L. Di Venere; E. Do Couto E Silva; P.S. Drell; A. Drlica-Wagner; C. Favuzzi; S.J. Fegan; E.C. Ferrara; W.B. Focke; A. Franckowiak; Y. Fukazawa; S. Funk; P. Fusco; F. Gargano; D. Gasparrini; S. Germani; N. Giglietto; F. Giordano; M. Giroletti; T. Glanzman; G. Godfrey; G.A. Gomez-Vargas; I.A. Grenier; J.E. Grove; S. Guiriec; M. Gustafsson; D. Hadasch; Y. Hanabata; A.K. Harding; M. Hayashida; K. Hayashi; J.W. Hewitt; D. Horan; X. Hou; R.E. Hughes; Y. Inoue; M.S. Jackson; T. Jogler; G. Johannesson; A.S. Johnson; T. Kamae; T. Kawano; J. Knodlseder; M. Kuss; J. Lande; S. Larsson; L. Latronico; F. Longo; F. Loparco; M.N. Lovellette; P. Lubrano; M. Mayer; M.N. Mazziotta; J.E. Mcenery; J. Mehault; P.F. Michelson; W. Mitthumsiri; T. Mizuno; A.A. Moiseev; C. Monte; M.E. Monzani; A. Morselli; I.V. Moskalenko; S. Murgia; R. Nemmen; E. Nuss; T. Ohsugi; A. Okumura; M. Orienti; E. Orlando; J.F. Ormes; D. Paneque; J.H. Panetta; J.S. Perkins; M. Pesce-Rollins; F. Piron; G. Pivato; T.A. Porter; S. Raino; R. Rando; M. Razzano; S. Razzaque; A. Reimer; O. Reimer; S. Ritz; M. Roth; M. Schaal; A. Schulz; C. Sgro; E.J. Siskind; G. Spandre; P. Spinelli; A.W. Strong; H. Takahashi; Y. Takeuchi; J.G. Thayer; J.B. Thayer; D.J. Thompson; L. Tibaldo; M. Tinivella; D.F. Torres; G. Tosti; E. Troja; V. Tronconi; T.L. Usher; J. Vandenbroucke; V. Vasileiou; G. Vianello; V. Vitale; M. Werner; B.L. Winer; K.S. Wood; M. Wood; Z. Yang

doi:10.1103/PhysRevLett.112.151103

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Inferred Cosmic-Ray Spectrum from Fermi Large Area Telescope γ-Ray Observations of Earth’s Limb

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Inferred Cosmic-Ray Spectrum from Fermi Large Area Telescope γ-Ray Observations of Earth’s Limb

M. Ackermann, M. Ajello, A. Albert, A. Allafort, L. Baldini, G. Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, R.D. Blandford, …

Physical Review Letters, Vol.112

2014

DOI: https://doi.org/10.1103/PhysRevLett.112.151103

Abstract

96.50.sb

95.85.Pw

95.85.Ry

98.70.Sa

p: spectrum

cosmic radiation: spectrum

photon: energy

helium: spectrum

gamma ray: emission

GLAST

PAMELA

CREAM

Recent accurate measurements of cosmic-ray (CR) species by ATIC-2, CREAM, and PAMELA reveal an unexpected hardening in the proton and He spectra above a few hundred GeV, a gradual softening of the spectra just below a few hundred GeV, and a harder spectrum of He compared to that of protons. These newly discovered features may offer a clue to the origin of high-energy CRs. We use the Fermi Large Area Telescope observations of the γ-ray emission from Earth’s limb for an indirect measurement of the local spectrum of CR protons in the energy range ∼90 GeV–6 TeV (derived from a photon energy range 15 GeV–1 TeV). Our analysis shows that single power law and broken power law spectra fit the data equally well and yield a proton spectrum with index 2.68±0.04 and 2.61±0.08 above ∼200 GeV, respectively.

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Title: Inferred Cosmic-Ray Spectrum from Fermi Large Area Telescope γ-Ray Observations of Earth’s Limb
Creators - without role: M. Ackermann - Deutsches Elektronen-Synchrotron DESY
M. Ajello - University of California, Berkeley
A. Albert - Kavli Institute for Particle Astrophysics and Cosmology
A. Allafort - Kavli Institute for Particle Astrophysics and Cosmology
L. Baldini - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
G. 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
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
E. Bottacini - Kavli Institute for Particle Astrophysics and Cosmology
A. Bouvier - University of California, Santa Cruz
T.J. Brandt - Goddard Space Flight Center
M. Brigida - Polytechnic University of Bari
P. Bruel - Centre National de la Recherche Scientifique
R. Buehler - Deutsches Elektronen-Synchrotron DESY
S. Buson - University of Padua
G.A. Caliandro - Kavli Institute for Particle Astrophysics and Cosmology
R.A. Cameron - Stanford University
P.A. Caraveo - Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
C. Cecchi - University of Perugia
E. Charles - Kavli Institute for Particle Astrophysics and Cosmology
R.C.G. Chaves - Université Paris Cité
A. Chekhtman - George Mason University
J. Chiang - Kavli Institute for Particle Astrophysics and Cosmology
G. Chiaro - University of Padua
S. Ciprini - Astronomical Observatory of Rome
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
M. Dalton - Laboratoire de Physique des deux infinis Bordeaux
F. d'Ammando
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 - United States Naval Research Laboratory
S.W. Digel - Kavli Institute for Particle Astrophysics and Cosmology
L. Di Venere - Polytechnic University of Bari
E. Do Couto E Silva
P.S. Drell - Kavli Institute for Particle Astrophysics and Cosmology
A. Drlica-Wagner - Fermi National Accelerator Laboratory
C. Favuzzi - Polytechnic University of Bari
S.J. Fegan - Laboratoire Leprince-Ringuet
E.C. Ferrara - Goddard Space Flight Center
W.B. Focke - Stanford University
A. Franckowiak - Kavli Institute for Particle Astrophysics and Cosmology
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 - Astronomical Observatory of Rome
S. Germani - University of Perugia
N. Giglietto - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
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
G.A. Gomez-Vargas - Universidad Autónoma de Madrid
I.A. Grenier - CEA Paris-Saclay
J.E. Grove - United States Naval Research Laboratory
S. Guiriec - Goddard Space Flight Center
M. Gustafsson - Université Libre de Bruxelles
D. Hadasch - Universität Innsbruck
Y. Hanabata - The University of Tokyo
A.K. Harding - Goddard Space Flight Center
M. Hayashida - The University of Tokyo
K. Hayashi - Institute of Space and Astronautical Science
J.W. Hewitt - Goddard Space Flight Center
D. Horan - Laboratoire Leprince-Ringuet
X. Hou - Laboratoire de Physique des deux infinis Bordeaux
R.E. Hughes - The Ohio State University
Y. Inoue - Kavli Institute for Particle Astrophysics and Cosmology
M.S. Jackson - Fraunhofer Chalmers Research Centre for Industrial Mathematics
T. Jogler - Stanford University
G. Johannesson - University of Iceland
A.S. Johnson - Kavli Institute for Particle Astrophysics and Cosmology
T. Kamae - Kavli Institute for Particle Astrophysics and Cosmology
T. Kawano - Hiroshima University
J. Knodlseder - Centre National de la Recherche Scientifique
M. Kuss - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
J. Lande - Kavli Institute for Particle Astrophysics and Cosmology
S. Larsson - Stockholm University
L. Latronico - Istituto Nazionale di Fisica Nucleare, Sezione di Torino
F. Longo - Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
F. Loparco - Polytechnic University of Bari
M.N. Lovellette - United States Naval Research Laboratory
P. Lubrano - University of Perugia
M. Mayer - Deutsches Elektronen-Synchrotron DESY
M.N. Mazziotta - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
J.E. Mcenery - University of Maryland, College Park
J. Mehault - Institut National de Physique Nucléaire et de Physique des Particules
P.F. Michelson - Kavli Institute for Particle Astrophysics and Cosmology
W. Mitthumsiri - Kavli Institute for Particle Astrophysics and Cosmology
T. Mizuno - Hiroshima University
A.A. Moiseev - Goddard Space Flight Center
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 - University of California, Irvine
R. Nemmen - Goddard Space Flight Center
E. Nuss - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
T. Ohsugi - Hiroshima University
A. Okumura - Stanford University
M. Orienti - Istituto di Radioastronomia di Bologna
E. Orlando - SLAC National Accelerator Laboratory
J.F. Ormes - University of Denver
D. Paneque - Kavli Institute for Particle Astrophysics and Cosmology
J.H. Panetta - Kavli Institute for Particle Astrophysics and Cosmology
J.S. Perkins - Goddard Space Flight Center
M. Pesce-Rollins - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
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 - Polytechnic University of Bari
R. Rando - University of Padua
M. Razzano - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
S. Razzaque - University of Johannesburg
A. Reimer - Kavli Institute for Particle Astrophysics and Cosmology
O. Reimer - Kavli Institute for Particle Astrophysics and Cosmology
S. Ritz - University of California, Santa Cruz
M. Roth - University of Washington
M. Schaal - National Academy of Sciences
A. Schulz - Deutsches Elektronen-Synchrotron DESY
C. Sgro - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
E.J. Siskind - Real Time Tomography
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
Y. Takeuchi - Waseda University
J.G. Thayer - Kavli Institute for Particle Astrophysics and Cosmology
J.B. Thayer - Stanford University
D.J. Thompson - Goddard Space Flight Center
L. Tibaldo - Kavli Institute for Particle Astrophysics and Cosmology
M. Tinivella - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
D.F. Torres - Institució Catalana de Recerca i Estudis Avançats
G. Tosti - University of Perugia
E. Troja - Goddard Space Flight Center
V. Tronconi - University of Padua
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 - Kavli Institute for Particle Astrophysics and Cosmology
V. Vitale - University of Rome Tor Vergata
M. Werner - Universität Innsbruck
B.L. Winer - The Ohio State University
K.S. Wood - United States Naval Research Laboratory
M. Wood - Kavli Institute for Particle Astrophysics and Cosmology
Z. Yang - Fraunhofer Chalmers Research Centre for Industrial Mathematics
Publication Details: Physical Review Letters, Vol.112
Identifiers: 9936176409311
Academic Unit: Laboratoire Univers et Particules de Montpellier - LUPM
Language: English
Resource Type: Journal article
Local Fields: hal-02017125