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Title: The spectrum of isotropic diffuse gamma-ray emission between 100 MeV and 820 GeV
Authors: M. Ackermann
M. Ajello
A. Albert
W. B. Atwood
L. Baldini
J. Ballet
G. Barbiellini
D. Bastieri
K. Bechtol
R. Bellazzini
E. Bissaldi
R. D. Blandford
E. D. Bloom
E. Bottacini
T. J. Brandt
J. Bregeon
P. Bruel
R. Buehler
S. Buson
G. A. Caliandro
R. A. Cameron
M. Caragiulo
P. A. Caraveo
E. Cavazzuti
C. Cecchi
E. Charles
A. Chekhtman
J. Chiang
G. Chiaro
S. Ciprini
R. Claus
J. Cohen-Tanugi
J. Conrad
A. Cuoco
S. Cutini
F. D'Ammando
A. De Angelis
F. De Palma
C. D. Dermer
S. W. Digel
E. Do Couto E Silva
P. S. Drell
C. Favuzzi
E. C. Ferrara
W. B. Focke
A. Franckowiak
Y. Fukazawa
S. Funk
P. Fusco
F. Gargano
D. Gasparrini
S. Germani
N. Giglietto
P. Giommi
F. Giordano
M. Giroletti
G. Godfrey
G. A. Gomez-Vargas
I. A. Grenier
S. Guiriec
M. Gustafsson
D. Hadasch
K. Hayashi
E. Hays
J. W. Hewitt
P. Ippoliti
T. Jogler
G. Jóhannesson
A. S. Johnson
W. N. Johnson
T. Kamae
J. Kataoka
J. Knödlseder
M. Kuss
S. Larsson
Deutsche Elektronen-Synchrotron
Clemson University
Kavli Institute for Particle Astrophysics and Cosmology
Santa Cruz Institute for Particle Physics
Istituto Nazionale di Fisica Nucleare, Roma
Institut de Recherche sur les Lois Fondamentales de l'Univers
Universita degli Studi di Trieste
Istituto Nazionale Di Fisica Nucleare, Sezione di Padova
Universita degli Studi di Padova
University of Chicago
NASA Goddard Space Flight Center
Laboratoire Univers et Particules de Montpellier
Laboratoire Leprince-Ringuet
Consorzio Interuniversitario per la Fisica Spaziale (CIFS)
INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Milan
Agenzia Spaziale Italiana
Universita degli Studi di Perugia
George Mason University, Fairfax Campus
Osservatorio Astronomico di Roma
Stockholms universitet
Oskar Klein Centre for Cosmoparticle Physics
Kungl. Vetenskapsakademien
Universita degli Studi di Torino
Istituto Di Radioastronomia, Bologna
Alma Mater Studiorum Universita di Bologna
Universita degli Studi di Napoli Federico II
Naval Research Laboratory
Universita degli Studi di Bari
Hiroshima University
Pontificia Universidad Catolica de Chile
Université libre de Bruxelles (ULB)
Medizinische Universitat Innsbruck
JAXA Institute of Space and Astronautical Science
University of Maryland, Baltimore County
University Science Institute Reykjavik
Waseda University
CNRS Centre National de la Recherche Scientifique
Universite de Toulouse
Instituto de Estudios Espaciales de Cataluna
The Royal Institute of Technology (KTH)
Centre d'Etudes Nucleaires de Bordeaux Gradignan
Yale University
University of Maryland
Mahidol University
University of California, Irvine
Keywords: Earth and Planetary Sciences
Issue Date: 20-Jan-2015
Citation: Astrophysical Journal. Vol.799, No.1 (2015)
Abstract: © 2015. The American Astronomical Society. All rights reserved. The γ-ray sky can be decomposed into individually detected sources, diffuse emission attributed to the interactions of Galactic cosmic rays with gas and radiation fields, and a residual all-sky emission component commonly called the isotropic diffuse γ-ray background (IGRB). The IGRB comprises all extragalactic emissions too faint or too diffuse to be resolved in a given survey, as well as any residual Galactic foregrounds that are approximately isotropic. The first IGRB measurement with the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope (Fermi ) used 10 months of sky-survey data and considered an energy range between 200 MeV and 100 GeV. Improvements in event selection and characterization of cosmic-ray backgrounds, better understanding of the diffuse Galactic emission (DGE), and a longer data accumulation of 50 months allow for a refinement and extension of the IGRB measurement with the LAT, now covering the energy range from 100 MeV to 820 GeV. The IGRB spectrum shows a significant high-energy cutoff feature and can be well described over nearly four decades in energy by a power law with exponential cutoff having a spectral index of 2.32 ± 0.02 and a break energy of (279 ± 52) GeV using our baseline DGE model. The total intensity attributed to the IGRB is (7.2 ± 0.6) x 10-6 cm-2 s-1 sr-1 above 100 MeV, with an additional +15%/-30% systematic uncertainty due to the Galactic diffuse foregrounds.
ISSN: 15384357
Appears in Collections:Scopus 2011-2015

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