Publication:
Inferred cosmic-ray spectrum from fermi large area telescope -Ray Observations of Eartha's Limb

Issued Date

2014-04-17

Resource Type

Article

ISSN

10797114
00319007

DOI

10.1103/PhysRevLett.112.151103

Other identifier(s)

2-s2.0-84898959342

Rights

Mahidol University

Rights Holder(s)

SCOPUS

Bibliographic Citation

Physical Review Letters. Vol.112, No.15 (2014)

Suggested Citation

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 Inferred cosmic-ray spectrum from fermi large area telescope -Ray Observations of Eartha's Limb. Physical Review Letters. Vol.112, No.15 (2014). doi:10.1103/PhysRevLett.112.151103 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/34926

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Title

Inferred cosmic-ray spectrum from fermi large area telescope -Ray Observations of Eartha's Limb

Author(s)

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

Other Contributor(s)

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

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.

Keyword(s)

Physics and Astronomy

Availability

URI

https://repository.li.mahidol.ac.th/handle/123456789/34926

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