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, 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 $2.32\pm 0.02$ and a break energy of $(279\pm 52)$ GeV using our baseline diffuse Galactic emission model. The total intensity attributed to the IGRB is $(7.2\pm 0.6)\times 10^{-6}$ cm${}^{-2}$ s${}^{-1}$ sr${}^{-1}$ above 100 MeV, with an additional $+15$%/$-30$% systematic uncertainty due to the Galactic diffuse foregrounds.

arXiv commentAccepted by The Astrophysical Journal

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• Randomness in the Dark Sector: Emergent Mass Spectra and Dynamical Dark Matter Ensembles
• High-energy neutrino emission subsequent to gravitational wave radiation from supermassive black hole mergers
• A Determination of the Gamma-ray Flux and Photon Spectral Index Distributions of Blazars from the Fermi-LAT 3LAC
• Origin of the light cosmic ray component below the ankle
• The Diffuse Gamma-Ray Flux from Clusters of Galaxies
• Cosmological Evolution of Fermi-LAT Gamma-ray Blazars Using Novel Nonparametric Methods
• Astrophysical interpretation of the anisotropies in the unresolved gamma-ray background
• The correlation of extragalactic $\gamma$-rays with cosmic matter density distributions from weak-gravitational lensing
• Extreme & High Synchrotron Peaked Blazars at the limit of Fermi-LAT detectability: the $\gamma$-ray spectrum of 1BIGB sources
• Dark Matter Line Searches with the Cherenkov Telescope Array
• Bounds on WIMP dark matter from galaxy clusters at low redshift
• Prospects for detection of a Galactic diffuse neutrino flux
• High-Energy Neutrinos from Gamma-Ray-Faint Accretion-Powered Hypernebulae
• Effect of axion-like particles on the spectrum of the extragalactic gamma-ray background
• Fluxes of diffuse gamma rays and neutrinos from cosmic-ray interactions with circumgalactic gas
• PeV scale Supersymmetry breaking and the IceCube neutrino flux
• Search for High-Energy Neutrinos from Ultra-Luminous Infrared Galaxies with IceCube
• A Phantom Menace: On the Morphology of the Galactic Center Excess
• Characterising the signatures of star-forming galaxies in the extra-galactic $\gamma$-ray background
• Gamma-ray and Neutrino Signals from Accretion Disk Coronae of Active Galactic Nuclei
• Robust inference of the Galactic centre gamma-ray excess spatial properties
• Constraints on the proton fraction of cosmic rays at the highest energies and the consequences for cosmogenic neutrinos and photons
• Using the Extragalactic Gamma-Ray Background to Constrain the Hubble Constant and Matter Density of the Universe
• Primordial Black Hole Constraints with Large Extra Dimensions
• The Sensitivity of Future Gamma-Ray Telescopes to Primordial Black Holes
• Measurement of redshift dependent cross correlation of HSC clusters and Fermi $\gamma$ rays
• Reconstructing WIMP properties through an interplay of signal measurements in direct detection, Fermi-LAT, and CTA searches for dark matter
• A general study of decaying scalar dark matter: existing limits and projected radio signals at the SKA
• Mergers of Maximally Charged Primordial Black Holes
• Constraining particle dark matter using local galaxy distribution
• The Gamma-ray Afterglows of Tidal Disruption Events
• Neutrinophilic Dark Matter in the epoch of IceCube and Fermi-LAT
• Transient High-energy Gamma-rays and Neutrinos from Nearby Type II Supernovae
• IceCube's astrophysical neutrino energy spectrum from CPT violation
• Extragalactic diffuse gamma-rays from dark matter annihilation: revised prediction and full modelling uncertainties
• Observable Signatures of Cosmic Rays Transport in Starburst Galaxies on Gamma-ray and Neutrino Observations
• SN 2023ixf -- an average-energy explosion with circumstellar medium and a precursor
• The effect of stellar encounters on the dark matter annihilation signal from prompt cusps
• Ultra high energy cosmic rays from non-relativistic quasar outflows
• New mechanism of producing superheavy Dark Matter
• Galactic Diffuse Neutrino Emission from Sources beyond the Discovery Horizon
• High-Energy Galactic Cosmic Rays (Astro2020 Science White Paper)
• Synergies across the spectrum for particle dark matter indirect detection: how HI intensity mapping meets gamma rays
• Robustness of the Galactic Center Excess Morphology Against Masking
• Bow Ties in the Sky II: Searching for Gamma-ray Halos in the Fermi Sky Using Anisotropy
• Constraints on dark matter with future MeV gamma-ray telescopes
• Constraints on late-forming exploding black holes
• How far are the sources of IceCube neutrinos? Constraints from the diffuse TeV gamma-ray background
• Ultrahigh energy cosmic rays and neutrinos from light nuclei composition
• High-energy gamma-ray emission from memory-burdened primordial black holes
• Cosmic rays from massive star clusters : A close look at Westerlund 1
• Neutrinos from Primordial Black Holes in Theories with Extra Dimensions
• Multi-wavelength radiation models for low-luminosity GRBs, and the implications for UHECRs
• Astroparticles from X-ray Binary Coronae
• Cosmic Gamma-ray Background Radiation
• The Steady-State Multi-TeV Diffuse Gamma-Ray Emission Predicted with GALPROP and Prospects for the Cherenkov Telescope Array
• A Cross-correlation Study between IceCube Neutrino Events and the Fermi Unresolved Gamma-ray Sky
• PeV-EeV neutrinos from gamma-ray blazars due to ultrahigh-energy cosmic-ray propagation
• New constraints on the gamma-ray and high energy neutrino fluxes from the circumstellar interaction of SN 2023ixf
• Antideuterons from Decaying Gravitino Dark Matter
• Twin Quark Dark Matter From Cogenesis
• The Effects Of Relativistic Hidden Sector Particles on the Matter Power Spectrum
• On the Merger Rate of Primordial Black Holes in Cosmic Voids
• Flat spectrum radio quasars and BL Lacs dominate the anisotropy of the unresolved gamma-ray background
• Carpet-2 search for PeV gamma rays associated with IceCube high-energy neutrino events
• Selected Topics in Cosmic Ray Physics
• New determination of the production cross section for $\gamma$ rays in the Galaxy
• Cosmological Evolution of Flat-Spectrum Radio Quasars based on the {\it Swift}/BAT 105-month Catalog and Their Contribution to the Cosmic MeV Gamma-ray Background Radiation
• Gamma Ray Signals from Cosmic Ray Scattering on Axion-Like Particles
• Cosmic Radio Background from Primordial Black Holes at Cosmic Dawn
• Identifying Galactic Sources of High-Energy Neutrinos
• Two-mediator dark matter models and cosmic electron excess
• Searching for dark matter annihilation from individual halos: uncertainties, scatter and signal-to-noise ratios
• High-Energy Gamma Rays and Neutrinos from Nearby Radio Galaxies
• Quantum gravity phenomenology at the dawn of the multi-messenger era -- A review
• Indirect effects of dark matter
• Development of dark disk model of positron anomaly origin
• Harnessing the Population Statistics of Subhalos to Search for Annihilating Dark Matter
• Limits on dark matter annihilation in prompt cusps from the isotropic gamma-ray background
• High-energy neutrinos from choked-jet supernovae: Searches and implications
• Got plenty of nothing: cosmic voids as a probe of particle dark matter
• The Andromeda Gamma-Ray Excess: Background Systematics of the Millisecond Pulsars and Dark Matter Interpretations
• Cosmological Constraints on Unstable Particles: Numerical Bounds and Analytic Approximations
• Cosmogenic photons strongly constrain UHECR source models
• Confronting recent AMS-02 positron fraction and Fermi-LAT Extragalactic Gamma-Ray Background measurements with gravitino dark matter
• How an era of kination impacts substructure and the dark matter annihilation rate
• Searches for correlation between UHECR events and high-energy gamma-ray Fermi-LAT data
• Constraints on dark matter and astrophysics from tomographic $\gamma$-ray cross-correlations
• Oscillations of sterile neutrinos from dark matter decay eliminates the IceCube-Fermi tension
• Simulations of Gravitational Heating Due to Early Matter Domination
• Lower Bound on the Cosmic TeV Gamma-ray Background Radiation
• Probing multicomponent FIMP scenarios with gamma-ray telescopes
• Constraints on ultracompact minihalos from the extragalactic gamma-ray background observation
• Weighing the Local Interstellar Medium using Gamma Rays and Dust
• Constraining dark matter annihilation with HSC Low Surface Brightness Galaxies
• A complete sample of LSP blazars fully described in $\gamma$-rays. New $\gamma$-ray detections and associations with Fermi-LAT
• Constraints on the hosts of UHECR accelerators
• The extragalactic $\gamma$-ray background: imprints from the physical properties and evolution of star-forming galaxy populations
• High-energy Gamma-rays from Magnetically Arrested Disks in Nearby Radio Galaxies
• Multi-messenger High-Energy Signatures of Decaying Dark Matter and the Effect of Background Light
• Addressing $\gamma$-ray emissions from dark matter annihilations in 45 milky way satellite galaxies and in extragalactic sources with particle dark matter models
• Gamma-ray Production in the Extended Halo of the Galaxy and Possible Implications for the Origin of Galactic Cosmic Rays
• Fireballs from Superconducting Cosmic Strings
• High Energy Gamma Rays from Nebulae Associated with Extragalactic Microquasars and Ultra-Luminous X-ray Sources
• Superheavy Supersymmetric Dark Matter for the origin of KM3NeT Ultra-High Energy signal
• Connecting direct and indirect detection with a dark spike in the cosmic-ray electron spectrum
• Searching for temporary gamma-ray dark blazars associated with IceCube neutrinos
• Constraining axionlike particles with invisible neutrino decay using the IceCube observations of NGC 1068
• Observing small-scale $\gamma$-ray anisotropies with the Cherenkov Telescope Array
• Gamma-Rays from Star Forming Activity Appear to Outshine Misaligned Active Galactic Nuclei
• "Non-Local" Effects from Boosted Dark Matter in Indirect Detection
• A decaying neutralino as dark matter and its gamma ray spectrum
• Sharp spectral features from light dark matter decay via gravity portals
• The prediction of using LHAASO's cosmic-ray electron measurements to constrain decaying heavy dark matter
• Early Decay of Peccei-Quinn Fermion and the IceCube Neutrino Events
• Constraining gravitational-wave backgrounds from conversions into photons in the Galactic magnetic field
• Gamma-ray signals from multicomponent scalar dark matter decays
• Dark Matter in Very Supersymmetric Dark Sectors
• The origin of the power-law form of the extragalactic gamma-ray flux
• Detectors for high-energy messengers from the Universe
• The Possibility of Investigating Ultra-High-Energy Cosmic-Ray Sources Using Data on the Extragalactic Diffuse Gamma-Ray Emission
• γ-Ray and ultra-high energy neutrino background suppression due to solar radiation
• Extragalactic Gamma-ray Background from Star-forming Galaxies: Will Empirical Scalings Suffice?
• Constraining Dark Matter and Ultra-High Energy Cosmic Ray Sources with Fermi-LAT Diffuse Gamma Ray Background
• Extracting the gamma-ray source-count distribution below the Fermi-LAT detection limit with deep learning
• Telescope Concepts in Gamma-Ray Astronomy
• Search for decaying heavy dark matter in an effective interaction framework: a comparison of $\gamma$-ray and radio observations
• 21-cm Constraints on Dark Matter Annihilation after an Early Matter-Dominated Era
• Diffuse neutrino flux from relativistic reconnection in AGN coronae
• Galactic Cosmic-Ray Induced Production of Lithium in the Small Magellanic Cloud
• Dark matter component decaying after recombination: constraints from diffuse gamma-ray and neutrino flux measurements
• Atmospheric Cherenkov Telescopes as a Potential Veto Array for Neutrino Astronomy
• Mapping large-scale diffuse gamma-ray emission in 10-100 TeV band with Cherenkov telescopes
• Gamma-ray and radio background constraints on cosmic rays in Milky Way circumgalactic medium
• Interpretations of the possible 42.7 GeV $\gamma$-ray line
• Astrophysical neutrinos: theory
• Probing local cosmic rays using Fermi-LAT observation of a mid-latitude region in the third Galactic quadrant
• Decaying Fermionic Dark Matter Search with CALET
• The Observation of High-Energy Neutrinos from the Cosmos: Lessons Learned for Multimessenger Astronomy
• Contribution of Cosmic Rays from Sources with a Monoenergetic Proton Spectrum to the Extragalactic Diffuse Gamma-Ray Emission
• Revisiting gravitino dark matter in thermal leptogenesis
• Gamma-rays from the circumgalactic medium of M31
• On the measurement of handedness in Fermi Large Area Telescope data
• The Cherenkov Telescope Array Will Test Whether Pulsars Generate the Galactic Center Gamma-Ray Excess
• Constraining the hadronic properties of star-forming galaxies above $1\mathrm{GeV}$ with 15-years Fermi-LAT data
• High-Significance Detection of Correlation Between the Unresolved Gamma-Ray Background and the Large Scale Cosmic Structure
• Investigating starburst-driven neutrino emission from galaxies in the Great Observatories All-Sky LIRG Survey
• Multimessenger Astronomy with Neutrinos
• Limit on an Isotropic Diffuse Gamma-Ray Population with HAWC
• Extragalactic cosmic ray sources with very small contribution in the particle flux on the Earth and their study
• The Dawn of Multi-Messenger Astronomy
• Multi-messenger connection in high-energy neutrino astronomy
• Challenges for Cosmic-ray Experiments
• Evidence for GeV Cosmic Rays from White Dwarfs in the Local Cosmic Ray Spectra and in the Gamma-ray Emissivity of the Inner Galaxy
• Galactic Gamma Ray Background from Interactions of Cosmic Rays
• A relook at the GZK Neutrino-Photon Connection: Impact of Extra-galactic Radio Background & UHECR properties
• Neutrino Sources from a Multi-Messenger Perspective
• The diffuse extragalactic gamma-ray background radiation: star-forming galaxies are not the dominant component
• Limits on Early Matter Domination from the Isotropic Gamma-Ray Background
• Ultra High Energy Neutrino Event KM3-230213A as a Signal of Electroweak Vacuum Turbulence in Merging Black Hole Binaries
• Constraining blazar heating with the 2<z<3 Lyman-$\alpha$ forest
• Very-high-energy observations of the Seyfert galaxy NGC 4151 with MAGIC -- Indication of another gamma-ray obscured candidate neutrino source
• How do the dynamics of the Milky Way -- Large Magellanic Cloud system affect gamma-ray constraints on particle dark matter?
• IceCube PeV Neutrinos and Leptophilic Dark Matter
• The decaying and scattering properties of the $d^{\ast }$(2380) hexaquark Bose Einstein Condensate dark matter
• Prospects of detecting a large-scale anisotropy of ultra-high-energy cosmic rays from a nearby source with the K-EUSO orbital telescope
• Cosmic Gamma Ray Constraints on the Indirect Effects of Dark Matter
• Exploring the MeV Sky with a Combined Coded Mask and Compton Telescope: The Galactic Explorer with a Coded Aperture Mask Compton Telescope (GECCO)
• Confronting cosmic ray electron and positron excesses with hybrid triplet Higgs portal dark matter
• Acoustic Neutrino Detection In a Adriatic Multidisciplinary Observatory (ANDIAMO)
• Constraints on the AGN flares as sources of ultra-high energy cosmic rays from the Fermi-LAT observations
• The Galactic Isotropic $\gamma$-ray Background and Implications for Dark Matter
• Observational constraints on dark matter decaying via gravity portals
• The GALPROP Cosmic-ray Propagation and Non-thermal Emissions Framework: Release v57
• Fundamental Physics With Cosmic High-Energy Gamma Rays
• Constraints on the origins of the Galactic neutrino flux
• Cosmological abundance of primordial black holes in mixed dark matter scenarios incorporating Kaluza-Klein dark matter
• Ultra-high energy event KM3-230213A as a cosmogenic neutrino in light of minimal UHECR flux models
• Observations of the Fermi bubbles and the Galactic center excess with the DArk Matter Particle Explorer
• Massive Star Clusters as sources of high-energy gamma radiation
• Source Count Distribution of Fermi LAT Gamma-Ray Blazars Using Novel Nonparametric Methods
• Searches for beyond-standard-model physics with astroparticle physics instruments
• Obscured $pp$-channel neutrino sources
• 2FHL: The second Catalog of hard {\it Fermi}-LAT sources
• Neutrino and Cosmic-Ray Emission and Cumulative Background from Radiatively Inefficient Accretion Flows in Low-Luminosity Active Galactic Nuclei
• First constraints on axion-like particles from Galactic sub-PeV gamma rays
• The Contribution From TeV Halos to the Isotropic Gamma-Ray Background
• Towards a Measurement of the $e^{+}{e}^{-}$ Flux above 1 TeV with HAWC
• Composite asymmetric dark matter with a dark photon portal: Multimessenger tests
• The calibrations of DAMPE $\gamma$-ray effective area
• Limits on primordial black holes detectability with Isatis: A BlackHawk tool
• Status of space-based gamma-ray astronomy
• Dark Matter and Galaxy Cross-Correlations with the Cherenkov Telescope Array Observatory
• Probing the anomalous positron fraction origin with fully leptonic decaying gravitino dark matter candidates
• A GeV-TeV particle component and the barrier of cosmic-ray sea in the Central Molecular Zone
• Consideration of a loop decay of dark matter particle into electron-positron from point of view of possible FSR suppression
• An Interpretation of the Cosmic Ray $e^{+}+e^{-}$ Spectrum from 10 GeV to 3 TeV Measured by CALET on the ISS
• Selected results from IceCube
• A geomagnetic filter for the Fermi-LAT background
• On the contribution of cosmic-ray interactions in the circumgalactic gas to the observed high-energy neutrino flux
• Ultra High Energy Cosmic Rays: Origin, Composition and Spectrum
• Neutrino Constrains to the Diffuse Gamma-Ray Emission from Accretion Shocks
• Non-Thermal Production of Sexaquark Dark Matter
• Ultra-high energy cosmic rays from supermassive black holes: particle flux on the Earth and extragalactic diffuse emission
• Supermassive black holes and their surroundings: MeV signatures
• Statistical Measurement of the Gamma-ray Source-count Distribution as a Function of Energy
• On the baryon acoustic oscillation amplitude as a probe of radiation density
• The "Dark disk" model in the light of DAMPE experiment
• Solar gamma ray probe of local cosmic ray electrons
• Revisiting Disk Winds in Active Galactic Nuclei as an Origin of Cosmic Gamma-ray and Neutrino Backgrounds
• Diffuse continuum emission and large extended sources at MeV energies
• A 3D Monte Carlo calculation of the inverse Compton emission from the Sun and stars in presence of magnetic and electric fields
• Modeling the imprints of large-scale magnetized structures on $\gamma$-rays from extragalactic transients
• SimProp v2r3: Monte Carlo simulation code of UHECR propagation
• Theory of high-energy messengers
• Extragalactic Searches for Dark Matter Annihilation
• Measurement of High Energy Gamma Rays from 200 MeV to 1 TeV with the Alpha Magnetic Spectrometer on the International Space Station
• Aspects of astrophysical particle production and beyond the Standard Model phenomenology
• Common origin of the diffuse high energy backgrounds of gamma rays, neutrinos and cosmic ray positrons?
• Particle Reacceleration by Turbulence and Radio Constraints on Multi-Messenger High-Energy Emission from the Coma Cluster
• Isotropic diffuse and extragalactic $\gamma$-ray background: emission from extragalactic sources vs dark matter annihilating particles
• Implications of gamma-ray and neutrino observations on source models of ultrahigh energy cosmic rays
• Production and signatures of multi-flavour dark matter scenarios with t-channel mediators
• The Anisotropies and Origins of Ultrahigh Energy Cosmic Rays
• Ultrahigh energy cosmic ray nuclei from remnants of dead quasars
• Study of cosmic ray sources using data on extragalactic diffuse gamma-ray emission
• Thermally produced scalar singlet as leptonphilic dark matter
• Fenomenología de modelos supersimétricos: partículas y materia oscura
• Wiener filtering and multi-tracer techniques for dark matter cross-correlations between gamma-ray emission and galaxy catalogs
• The Gamma-ray Luminosity Function of Flat-Spectrum Radio Quasars
• Extreme Transients in Gamma Rays