THE SPECTRUM OF ISOTROPIC DIFFUSE GAMMA-RAY EMISSION BETWEEN 100 MeV AND 820 GeV
Abstract
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 IGRBmore »
- Authors:
-
- Deutsches Elektronen Synchrotron DESY, D-15738 Zeuthen (Germany)
- Department of Physics and Astronomy, Clemson University, Kinard Lab of Physics, Clemson, SC 29634-0978 (United States)
- W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305 (United States)
- Santa Cruz Institute for Particle Physics, Department of Physics and Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064 (United States)
- Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa (Italy)
- Laboratoire AIM, CEA-IRFU/CNRS/Université Paris Diderot, Service d'Astrophysique, CEA Saclay, F-91191 Gif sur Yvette (France)
- Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, I-34127 Trieste (Italy)
- Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova (Italy)
- Kavli Institute for Cosmological Physics, University of Chicago, Chicago, IL 60637 (United States)
- Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, and Università di Trieste, I-34127 Trieste (Italy)
- NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)
- Laboratoire Univers et Particules de Montpellier, Université Montpellier 2, CNRS/IN2P3, F-34095 Montpellier (France)
- Publication Date:
- OSTI Identifier:
- 22364446
- Resource Type:
- Journal Article
- Journal Name:
- Astrophysical Journal
- Additional Journal Information:
- Journal Volume: 799; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; APPROXIMATIONS; COSMIC GAMMA SOURCES; GAMMA RADIATION; GEV RANGE; INDEXES; MEV RANGE; MILKY WAY; PHOTON EMISSION; SPACE; TELESCOPES
Citation Formats
Ackermann, M., Buehler, R., Ajello, M., Albert, A., Blandford, R. D., Bloom, E. D., Bottacini, E., Caliandro, G. A., Atwood, W. B., Baldini, L., Bellazzini, R., Ballet, J., Barbiellini, G., Bastieri, D., Buson, S., Bechtol, K., Bissaldi, E., Brandt, T. J., Bregeon, J., Bruel, P., E-mail: markus.ackermann@desy.de, E-mail: bechtol@kicp.uchicago.edu, and others, and. THE SPECTRUM OF ISOTROPIC DIFFUSE GAMMA-RAY EMISSION BETWEEN 100 MeV AND 820 GeV. United States: N. p., 2015.
Web. doi:10.1088/0004-637X/799/1/86.
Ackermann, M., Buehler, R., Ajello, M., Albert, A., Blandford, R. D., Bloom, E. D., Bottacini, E., Caliandro, G. A., Atwood, W. B., Baldini, L., Bellazzini, R., Ballet, J., Barbiellini, G., Bastieri, D., Buson, S., Bechtol, K., Bissaldi, E., Brandt, T. J., Bregeon, J., Bruel, P., E-mail: markus.ackermann@desy.de, E-mail: bechtol@kicp.uchicago.edu, & others, and. THE SPECTRUM OF ISOTROPIC DIFFUSE GAMMA-RAY EMISSION BETWEEN 100 MeV AND 820 GeV. United States. https://doi.org/10.1088/0004-637X/799/1/86
Ackermann, M., Buehler, R., Ajello, M., Albert, A., Blandford, R. D., Bloom, E. D., Bottacini, E., Caliandro, G. A., Atwood, W. B., Baldini, L., Bellazzini, R., Ballet, J., Barbiellini, G., Bastieri, D., Buson, S., Bechtol, K., Bissaldi, E., Brandt, T. J., Bregeon, J., Bruel, P., E-mail: markus.ackermann@desy.de, E-mail: bechtol@kicp.uchicago.edu, and others, and. 2015.
"THE SPECTRUM OF ISOTROPIC DIFFUSE GAMMA-RAY EMISSION BETWEEN 100 MeV AND 820 GeV". United States. https://doi.org/10.1088/0004-637X/799/1/86.
@article{osti_22364446,
title = {THE SPECTRUM OF ISOTROPIC DIFFUSE GAMMA-RAY EMISSION BETWEEN 100 MeV AND 820 GeV},
author = {Ackermann, M. and Buehler, R. and Ajello, M. and Albert, A. and Blandford, R. D. and Bloom, E. D. and Bottacini, E. and Caliandro, G. A. and Atwood, W. B. and Baldini, L. and Bellazzini, R. and Ballet, J. and Barbiellini, G. and Bastieri, D. and Buson, S. and Bechtol, K. and Bissaldi, E. and Brandt, T. J. and Bregeon, J. and Bruel, P., E-mail: markus.ackermann@desy.de, E-mail: bechtol@kicp.uchicago.edu and others, and},
abstractNote = {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{sup –6} cm{sup –2} s{sup –1} sr{sup –1} above 100 MeV, with an additional +15%/–30% systematic uncertainty due to the Galactic diffuse foregrounds.},
doi = {10.1088/0004-637X/799/1/86},
url = {https://www.osti.gov/biblio/22364446},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 799,
place = {United States},
year = {Tue Jan 20 00:00:00 EST 2015},
month = {Tue Jan 20 00:00:00 EST 2015}
}
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Differential limit on the extremely-high-energy cosmic neutrino flux in the presence of astrophysical background from nine years of IceCube data
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Unresolved Gamma-Ray Sky through its Angular Power Spectrum
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Using the Extragalactic Gamma-Ray Background to Constrain the Hubble Constant and Matter Density of the Universe
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Open Questions in Cosmic-Ray Research at Ultrahigh Energies
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Search for dark matter annihilations towards the inner Galactic halo from 10 years of observations with H.E.S.S
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Acceleration and Propagation of Ultra High Energy Cosmic Rays
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Resolving the Extragalactic $\gamma$-Ray Background above 50 GeV with the Fermi Large Area Telescope
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Open Questions in Cosmic-Ray Research at Ultrahigh Energies
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Constraints on Gamma-Ray and Neutrino Emission from NGC 1068 with the MAGIC Telescopes
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The Origin of the Extragalactic Gamma-Ray Background and Implications for Dark-Matter Annihilation
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Limits on Dark Matter Annihilation Signals from the Fermi LAT 4-year Measurement of the Isotropic Gamma-Ray Background
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Testing the Dark Matter Scenario for PeV Neutrinos Observed in IceCube
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WIMP searches with gamma rays in the Fermi era: challenges, methods and results
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Dark matter searches in the gamma-ray extragalactic background via cross-correlations with galaxy catalogues
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IceCube neutrinos, decaying dark matter, and the Hubble constant
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Ultrahard spectra of PeV neutrinos from supernovae in compact star clusters
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Hidden Cosmic-Ray Accelerators as an Origin of TeV-PeV Cosmic Neutrinos
text, January 2015
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Evidence against star-forming galaxies as the dominant source of IceCube neutrinos
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A Composite Model for the 750 GeV Diphoton Excess
text, January 2016
- Harigaya, Keisuke; Nomura, Yasunori
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Extragalactic Background Light: Measurements and Applications
preprint, January 2016
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Production of keV Sterile Neutrinos in Supernovae: New Constraints and Gamma Ray Observables
text, January 2016
- Argüelles, Carlos A.; Brdar, Vedran; Kopp, Joachim
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A Case for Radio Galaxies as the Sources of IceCube's Astrophysical Neutrino Flux
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Heavy right-handed neutrino dark matter and PeV neutrinos at IceCube
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Cosmological constraints on dark matter annihilation and decay: Cross-correlation analysis of the extragalactic $γ$-ray background and cosmic shear
text, January 2016
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Search for dark matter annihilations towards the inner Galactic halo from 10 years of observations with H.E.S.S
text, January 2016
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Testing decay of astrophysical neutrinos with incomplete information
text, January 2016
- Bustamante, Mauricio; Beacom, John F.; Murase, Kohta
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The e-ASTROGAM mission (exploring the extreme Universe with gamma rays in the MeV-GeV range)
text, January 2016
- De Angelis, Alessandro; Tatischeff, Vincent; Tavani, Marco
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Cross-correlation of weak lensing and gamma rays: implications for the nature of dark matter
text, January 2016
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Bow Ties in the Sky II: Searching for Gamma-ray Halos in the Fermi Sky Using Anisotropy
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Linking High-Energy Cosmic Particles by Black-Hole Jets Embedded in Large-Scale Structures
text, January 2017
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Active Galactic Nuclei: what's in a name?
text, January 2017
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Extragalactic Gamma-ray Background from Star-forming Galaxies: Will Empirical Scalings Suffice?
text, January 2017
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Imprints of Cosmic Rays in Multifrequency Observations of the Interstellar Emission
text, January 2017
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Cumulative Neutrino and Gamma-Ray Backgrounds from Halo and Galaxy Mergers
text, January 2017
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New synthesis models of consistent extragalactic background light over cosmic time
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SED constraints on the highest-$z$ blazar jet: QSO J0906+6930
text, January 2018
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Unexpected Dip in the Solar Gamma-Ray Spectrum
text, January 2018
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A Multimessenger Picture of the Flaring Blazar TXS 0506+056: implications for High-Energy Neutrino Emission and Cosmic Ray Acceleration
text, January 2018
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Neutrinophilic Dark Matter in the epoch of IceCube and Fermi-LAT
text, January 2018
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Cosmic infrared background excess from axion-like particles and implications for multi-messenger observations of blazars
text, January 2018
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The Giant Radio Array for Neutrino Detection (GRAND): Science and Design
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Escape of cosmic rays from the Galaxy and effects on the circumgalactic medium
text, January 2019
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Background for a gamma-ray satellite on a low-Earth orbit
text, January 2019
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The Extragalactic Gamma-Ray Background from Core Dominated Radio Galaxies
text, January 2019
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Searching for gamma-ray emission from galaxy clusters at low redshift
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Detection of cross-correlation between gravitational lensing and gamma rays
text, January 2019
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{\it Fermi}-LAT Stacking Analysis Technique: An Application to Extreme Blazars and Prospects for their CTA Detection
text, January 2019
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Breaking a dark degeneracy: The gamma-ray signature of early matter domination
text, January 2019
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