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Title: Inferred cosmic-ray spectrum from fermi large area telescope -Ray Observations of Eartha's Limb
Authors: 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. Dammando
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. Jóhannesson
A. S. Johnson
T. Kamae
Deutsche Elektronen-Synchrotron
Space Sciences Laboratory at UC Berkeley
Kavli Institute for Particle Astrophysics and Cosmology
Istituto Nazionale di Fisica Nucleare, Roma
Universita degli Studi di Trieste
Istituto Nazionale Di Fisica Nucleare, Sezione di Padova
Universita degli Studi di Padova
Universita degli Studi di Perugia
Santa Cruz Institute for Particle Physics
NASA Goddard Space Flight Center
Politecnico di Bari
Laboratoire Leprince-Ringuet
Consorzio Interuniversitario per la Fisica Spaziale (CIFS)
INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Milan
Institut de Recherche sur les Lois Fondamentales de l'Univers
George Mason University, Fairfax Campus
Agenzia Spaziale Italiana
Osservatorio Astronomico di Roma
Laboratoire Univers et Particules de Montpellier
Stockholms universitet
Oskar Klein Centre for Cosmoparticle Physics
Kungl. Vetenskapsakademien
IN2P3 Institut National de Physique Nucleaire et de Physique des Particules
Istituto Di Radioastronomia, Bologna
Universita degli Studi di Udine
Naval Research Laboratory
Fermi National Accelerator Laboratory
Hiroshima University
Universidad Autonoma de Madrid
Université libre de Bruxelles (ULB)
Medizinische Universitat Innsbruck
University of Tokyo
JAXA Institute of Space and Astronautical Science
Ohio State University
The Royal Institute of Technology (KTH)
University Science Institute Reykjavik
CNRS Centre National de la Recherche Scientifique
Universite de Toulouse
University of Maryland
Mahidol University
Keywords: Physics and Astronomy
Issue Date: 17-Apr-2014
Citation: Physical Review Letters. Vol.112, No.15 (2014)
Abstract: 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 -ray emission from Earthas limb for an indirect measurement of the local spectrum of CR protons in the energy range 90GeV-6TeV (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 200GeV, respectively. © 2014 American Physical Society.
ISSN: 10797114
Appears in Collections:Scopus 2011-2015

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