The cosmic X-ray and gamma-ray background from dark matter annihilation

Abstract

(Abridged) The extragalactic background light (EBL) observed at multiple wavelengths is a promising tool to probe the nature of dark matter since it might contain a significant contribution from gamma-rays produced promptly by dark matter annihilation. Additionally, the electrons and positrons produced in the annihilation give energy to the CMB photons to populate the EBL with X-rays and gamma-rays. We here create full-sky maps of the radiation from both of these contributions using the high-resolution Millennium-II simulation. We use upper limits on the contributions of unknown sources to the EBL to constrain the intrinsic properties of dark matter using a model-independent approach that can be employed as a template to test different particle physics models (including those with a Sommerfeld enhancement). These upper limits are based on observations spanning eight orders of magnitude in energy (from soft X-rays measured by CHANDRA to gamma-rays measured by Fermi), and on expectations for the contributions from blazars and star forming galaxies. To exemplify this approach, we analyze a set of benchmark Sommerfeld-enhanced models that give the correct dark matter abundance, satisfy CMB constraints, and fit the cosmic ray spectra measured by PAMELA and Fermi without any contribution from local subhalos. We find that these models are in conflict with the EBL constraints unless the contribution of unresolved subhalos is small and the annihilation signal dominates the EBL. We conclude that provided the collisionless cold dark matter paradigm is accurate, even for conservative estimates of the contribution from unresolved subhalos and astrophysical backgrounds, the EBL is at least as sensitive a probe of these types of scenarios as the CMB. Our results disfavor an explanation of the positron excess measured by PAMELA based only on dark matter annihilation in the smooth Galactic halo.

arXiv comment18 pages, 7 figures, accepted for publication in Physical Review D. New Appendix D and other minor additions

References in corpus (63)

• A Universal Density Profile from Hierarchical Clustering
• Observation of an anomalous positron abundance in the cosmic radiation
• The Aquarius Project: the subhalos of galactic halos
• A Theory of Dark Matter
• Dark Matter Candidates from Particle Physics and Methods of Detection
• Resolving Cosmic Structure Formation with the Millennium-II Simulation
• DarkSUSY: Computing Supersymmetric Dark Matter Properties Numerically
• The Diversity and Similarity of Simulated Cold Dark Matter Halos
• Cluster Magnetic Fields
• Non-Perturbative Effect on Dark Matter Annihilation and Gamma Ray Signature from Galactic Center
• Pulsars as the Sources of High Energy Cosmic Ray Positrons
• The Spectrum of the Isotropic Diffuse Gamma-Ray Emission Derived From First-Year Fermi Large Area Telescope Data
• CMB Constraints on WIMP Annihilation: Energy Absorption During the Recombination Epoch
• Explosive Dark Matter Annihilation
• Cores in Dwarf Galaxies from Dark Matter with a Yukawa Potential
• Absolute measurement of the unresolved cosmic X-ray background in the 0.5-8 keV band with Chandra
• Detecting Dark Matter Annihilation with CMB Polarization : Signatures and Experimental Prospects
• The Space Density of Compton Thick AGN and the X-ray Background
• CMB constraints on Dark Matter models with large annihilation cross-section
• A new determination of the extragalactic diffuse gamma-ray background from EGRET data
• Cosmological dark matter annihilations into gamma-rays - a closer look
• Sommerfeld Enhancements for Thermal Relic Dark Matter
• A blueprint for detecting supersymmetric dark matter in the Galactic halo
• Particle Models and the Small-Scale Structure of Dark Matter
• Cosmic X-ray background and Earth albedo Spectra with Swift/BAT
• The Fermi-LAT high-latitude Survey: Source Count Distributions and the Origin of the Extragalactic Diffuse Background
• WIMPonium and Boost Factors for Indirect Dark Matter Detection
• INTEGRAL observations of the cosmic X-ray background in the 5-100 keV range via occultation by the Earth
• The Evolution of Swift/BAT blazars and the origin of the MeV background
• Constraints on Cosmological Dark Matter Annihilation from the Fermi-LAT Isotropic Diffuse Gamma-Ray Measurement
• Can the WIMP annihilation boost factor be boosted by the Sommerfeld enhancement?
• Dark matter interpretation of recent electron and positron data
• GeV Gamma-Ray Attenuation and the High-Redshift UV Background
• Anisotropy of the cosmic gamma-ray background from dark matter annihilation
• Detecting dark matter WIMPs in the Draco dwarf: a multi-wavelength perspective
• The Clumpiness of Cold Dark Matter: Implications for the Annihilation Signal
• Dark Matter Candidates - Axions, Neutralinos, Gravitinos, and Axinos
• Full calculation of clumpiness boost factors for antimatter cosmic rays in the light of Lambda-CDM N-body simulation results
• Galactic Substructure and Dark Matter Annihilation in the Milky Way Halo
• WIMPonium
• Is the PAMELA anomaly caused by the supernova explosions near the Earth?
• Cosmic Gamma-Ray Background from Star-Forming Galaxies
• Relic density and CMB constraints on dark matter annihilation with Sommerfeld enhancement
• Resolving the unresolved cosmic X-ray background in the Chandra Deep Fields
• Consistent Scenarios for Cosmic-Ray Excesses from Sommerfeld-Enhanced Dark Matter Annihilation
• Extragalactic Inverse Compton Light from Dark Matter Annihilation and the Pamela Positron Excess
• Anisotropy probe of galactic and extra-galactic Dark Matter annihilations
• Supersymmetric Dark Matter and the Extragalactic Gamma Ray Background
• Thermal Relic Abundances of Particles with Velocity-Dependent Interactions
• Indirect Dark Matter Detection Limits from the Ultra-Faint Milky Way Satellite Segue 1
• Implications of the Fermi-LAT diffuse gamma-ray measurements on annihilating or decaying Dark Matter
• Robust identification of isotropic diffuse gamma rays from Galactic dark matter
• Discovery of new faint radio emission on 8$\arcdeg$ to 3$\arcmin$ scales in the Coma field, and some Galactic and extragalactic implications
• Imprint of galaxy clustering in the cosmic gamma-ray background
• Extragalactic gamma-ray background radiation from dark matter annihilation
• Caustics in growing Cold Dark Matter Haloes
• Angular Signatures of Annihilating Dark Matter in the Cosmic Gamma-Ray Background
• Substructure Boosts to Dark Matter Annihilation from Sommerfeld Enhancement
• The Contribution Of Inverse Compton Scattering To The Diffuse Extragalactic Gamma-Ray Background From Annihilating Dark Matter
• The Signature of Large Scale Structures on the Very High Energy Gamma-Ray Sky
• Lifetime Constraints for Late Dark Matter Decay
• Sommerfeld Enhancement of DM Annihilation: Resonance Structure, Freeze-Out and CMB Spectral Bound
• A new Determination of the Extragalactic Background of Diffuse Gamma Rays taking into account Dark Matter Annihilation

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• The evolution of CMB spectral distortions in the early Universe
• New synthesis models of consistent extragalactic background light over cosmic time
• The nature of the Diffuse Gamma-Ray Background
• Which spectral distortions does $\Lambda$CDM actually predict?
• WMAP7 and future CMB constraints on annihilating dark matter: implications for GeV-scale WIMPs
• Prospects of detecting gamma-ray emission from galaxy clusters: cosmic rays and dark matter annihilations
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• Constraints on WIMP and Sommerfeld-Enhanced Dark Matter Annihilation from HESS Observations of the Galactic Center
• Tomographic-spectral approach for dark matter detection in the cross-correlation between cosmic shear and diffuse gamma-ray emission
• Les Houches Lectures on Indirect Detection of Dark Matter
• Highlights and Discoveries from the Chandra X-ray Observatory
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• Clustering in the Phase Space of Dark Matter Haloes. II. Stable Clustering and Dark Matter Annihilation
• Search for dark matter signals with Fermi-LAT observation of globular clusters NGC 6388 and M 15
• Sommerfeld-Enhanced Annihilation in Dark Matter Substructure: Consequences for Constraints on Cosmic-Ray Excesses
• Electrons and Positrons in Cosmic Rays
• Multi-messenger constraints on dark matter annihilation into electron-positron pairs
• Review of Indirect WIMP Search Experiments
• Extracting the size of the cosmic electron-positron anomaly
• Prospects of future MeV telescopes in probing weak-scale Dark Matter
• Saas-Fee Lecture Notes: Multi-messenger Astronomy and Dark Matter
• Numerical Simulations of the Dark Universe: State of the Art and the Next Decade
• Gamma-ray effects of dark forces in dark matter clumps