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

Issued Date

2015-01-20

Resource Type

Article

ISSN

15384357
0004637X

DOI

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

Other identifier(s)

2-s2.0-84921629099

Rights

Mahidol University

Rights Holder(s)

SCOPUS

Bibliographic Citation

Astrophysical Journal. Vol.799, No.1 (2015)

Suggested Citation

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 The spectrum of isotropic diffuse gamma-ray emission between 100 MeV and 820 GeV. Astrophysical Journal. Vol.799, No.1 (2015). doi:10.1088/0004-637X/799/1/86 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/35887

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Thesis

Title

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

Author(s)

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

Other Contributor(s)

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

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.

Keyword(s)

Earth and Planetary Sciences

Availability

URI

https://repository.li.mahidol.ac.th/handle/20.500.14594/35887

Collections

Scopus 2011-2015