The spectrum of isotropic diffuse gamma-ray emission between 100 MeV and 820 GeV

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; L. Latronico; J. Li; L. Li; F. Longo; F. Loparco; B. Lott; M.N. Lovellette; P. Lubrano; G.M. Madejski; A. Manfreda; F. Massaro; M. Mayer; M.N. Mazziotta; J.E. Mcenery; P.F. Michelson; W. Mitthumsiri; T. Mizuno; A.A. Moiseev; M.E. Monzani; A. Morselli; I.V. Moskalenko; S. Murgia; R. Nemmen; E. Nuss; T. Ohsugi; N. Omodei; E. Orlando; J.F. Ormes; D. Paneque; J.H. Panetta; J.S. Perkins; M. Pesce-Rollins; F. Piron; G. Pivato; T.A. Porter; S. Rainò; R. Rando; M. Razzano; S. Razzaque; A. Reimer; O. Reimer; T. Reposeur; S. Ritz; R.W. Romani; M. Sánchez-Conde; M. Schaal; A. Schulz; C. Sgrò; E.J. Siskind; G. Spandre; P. Spinelli; A.W. Strong; D.J. Suson; H. Takahashi; J.G. Thayer; J.B. Thayer; L. Tibaldo; M. Tinivella; D.F. Torres; G. Tosti; E. Troja; Y. Uchiyama; G. Vianello; M. Werner; B.L. Winer; K.S. Wood; M. Wood; G. Zaharijas; S. Zimmer

doi:10.1088/0004-637X/799/1/86

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The spectrum of isotropic diffuse gamma-ray emission between 100 MeV and 820 GeV

Journal article

Peer reviewed

The spectrum of isotropic diffuse gamma-ray emission between 100 MeV and 820 GeV

M. Ackermann, M. Ajello, A. Albert, W.B. Atwood, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, …

The Astrophysical Journal, Vol.799

2015

DOI: https://doi.org/10.1088/0004-637X/799/1/86

Abstract

gamma rays: diffuse background

diffuse radiation

gamma ray: energy spectrum

gamma ray: background

cosmic radiation: galaxy

gamma ray: VHE

GLAST

direct detection

cosmic background radiation

gamma ray: emission

gas

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) × 10(–)(6) cm(–)(2) s(–)(1) sr(–)(1) above 100 MeV, with an additional +15%/–30% systematic uncertainty due to the Galactic diffuse foregrounds.

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Title: The spectrum of isotropic diffuse gamma-ray emission between 100 MeV and 820 GeV
Creators - without role: M. Ackermann - Deutsches Elektronen-Synchrotron DESY
M. Ajello - Clemson University
A. Albert - Kavli Institute for Particle Astrophysics and Cosmology
W.B. Atwood - University of California, Santa Cruz
L. Baldini - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
J. Ballet - CEA Paris-Saclay
G. Barbiellini - University of Trieste
D. Bastieri - University of Padua
K. Bechtol - University of Chicago
R. Bellazzini - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
E. Bissaldi - Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
R.D. Blandford - Kavli Institute for Particle Astrophysics and Cosmology
E.D. Bloom - Kavli Institute for Particle Astrophysics and Cosmology
E. Bottacini - Kavli Institute for Particle Astrophysics and Cosmology
T.J. Brandt - Goddard Space Flight Center
J. Bregeon - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
P. Bruel - École Polytechnique
R. Buehler - Deutsches Elektronen-Synchrotron DESY
S. Buson - University of Padua
G.A. Caliandro - Consorzio Interuniversitario Fisica Spaziale
R.A. Cameron - Stanford University
M. Caragiulo - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
P.A. Caraveo - Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
E. Cavazzuti - Agenzia Spaziale Italiana
C. Cecchi - University of Perugia
E. Charles - Kavli Institute for Particle Astrophysics and Cosmology
A. Chekhtman - George Mason University
J. Chiang - Stanford University
G. Chiaro - University of Padua
S. Ciprini - Astronomical Observatory of Rome
R. Claus - Kavli Institute for Particle Astrophysics and Cosmology
J. Cohen-Tanugi - Laboratoire Univers et Particules de Montpellier
J. Conrad - Stockholm University
A. Cuoco - Istituto Nazionale di Fisica Nucleare, Sezione di Torino
S. Cutini - Agenzia Spaziale Italiana
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
E. Do Couto E Silva
P.S. Drell - Kavli Institute for Particle Astrophysics and Cosmology
C. Favuzzi - Polytechnic University of Bari
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 - Polytechnic University of Bari
P. Giommi - Agenzia Spaziale Italiana
F. Giordano - Polytechnic University of Bari
M. Giroletti - Istituto di Radioastronomia di Bologna
G. Godfrey - Kavli Institute for Particle Astrophysics and Cosmology
G.A. Gomez-Vargas - Pontificia Universidad Católica de Chile
I.A. Grenier - CEA Paris-Saclay
S. Guiriec - Goddard Space Flight Center
M. Gustafsson - Université Libre de Bruxelles
D. Hadasch - Universität Innsbruck
K. Hayashi - Institute of Space and Astronautical Science
E. Hays - Goddard Space Flight Center
J.W. Hewitt - Goddard Space Flight Center
P. Ippoliti - Istituto di Radioastronomia di Bologna
T. Jogler - Stanford University
G. Jóhannesson - University of Iceland
A.S. Johnson - Stanford University
W.N. Johnson - United States Naval Research Laboratory
T. Kamae - Kavli Institute for Particle Astrophysics and Cosmology
J. Kataoka - Waseda University
J. Knödlseder - Université Toulouse III - Paul Sabatier
M. Kuss - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
S. Larsson - Stockholm University
L. Latronico - Istituto Nazionale di Fisica Nucleare, Sezione di Torino
J. Li - Institute of Space Sciences
L. Li - KTH Royal Institute of Technology
F. Longo - University of Trieste
F. Loparco - Polytechnic University of Bari
B. Lott - Laboratoire de Physique des deux infinis Bordeaux
M.N. Lovellette - United States Naval Research Laboratory
P. Lubrano - University of Perugia
G.M. Madejski - Kavli Institute for Particle Astrophysics and Cosmology
A. Manfreda - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
F. Massaro - Yale University
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
P.F. Michelson - Kavli Institute for Particle Astrophysics and Cosmology
W. Mitthumsiri - Mahidol University
T. Mizuno - Hiroshima University
A.A. Moiseev - Goddard Space Flight Center
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
N. Omodei - Kavli Institute for Particle Astrophysics and Cosmology
E. Orlando - Kavli Institute for Particle Astrophysics and Cosmology
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 - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
T.A. Porter - Kavli Institute for Particle Astrophysics and Cosmology
S. Rainò - 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
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. Sánchez-Conde - Kavli Institute for Particle Astrophysics and Cosmology
M. Schaal - National Academy of Sciences
A. Schulz - Deutsches Elektronen-Synchrotron DESY
C. Sgrò - 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
D.J. Suson - Purdue University Northwest
H. Takahashi - Hiroshima University
J.G. Thayer - Kavli Institute for Particle Astrophysics and Cosmology
J.B. Thayer - Stanford University
L. Tibaldo - Kavli Institute for Particle Astrophysics and Cosmology
M. Tinivella - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
D.F. Torres - Institute of Space Sciences
G. Tosti - University of Perugia
E. Troja - Goddard Space Flight Center
Y. Uchiyama
G. Vianello - Kavli Institute for Particle Astrophysics and Cosmology
M. Werner - Universität Innsbruck
B.L. Winer - The Ohio State University
K.S. Wood - United States Naval Research Laboratory
M. Wood - Stanford University
G. Zaharijas - The Abdus Salam International Centre for Theoretical Physics (ICTP)
S. Zimmer - AlbaNova
Publication Details: The Astrophysical Journal, Vol.799
Identifiers: 9935253309311
Academic Unit: Laboratoire Univers et Particules de Montpellier - LUPM
Language: English
Resource Type: Journal article
Local Fields: hal-02017424