Multi-messenger constraints on dark matter annihilation into electron-positron pairs

Abstract

We investigate the production of electrons and positrons in the Milky Way within the context of dark matter annihilation. Upper limits on the relevant cross-section are obtained by combining observational data at different wavelengths (from Haslam, WMAP, and Fermi all-sky intensity maps) with recent measurements of the electron and positron spectra in the solar neighbourhood by PAMELA, Fermi, and HESS. We consider synchrotron emission in the radio and microwave bands, as well as inverse Compton scattering and final-state radiation at gamma-ray energies. According to our results, the dark matter annihilation cross-section into electron-positron pairs should not be higher than the canonical value for a thermal relic if the mass of the dark matter candidate is smaller than a few GeV. In addition, we also derive a stringent upper limit on the inner logarithmic slope, alpha, of the density profile of the Milky Way dark matter halo (alpha < 1 if m_dm < 5 GeV, alpha < 1.3 if m_dm < 100 GeV and alpha < 1.5 if m_dm < 2 TeV) assuming that cross-section = 3 x 10^(-26) cm^3 s(-1). A logarithmic slope steeper than alpha about 1.5 is hardly compatible with a thermal relic lighter than about 1 TeV, regardless of the dominant annihilation channel.

corrected results, added more annihilation channels, MNRAS in press

References in corpus (53)

• Observation of an anomalous positron abundance in the cosmic radiation
• Secluded WIMP Dark Matter
• A new measurement of the antiproton-to-proton flux ratio up to 100 GeV in the cosmic radiation
• CMB Constraints on WIMP Annihilation: Energy Absorption During the Recombination Epoch
• Weak Corrections are Relevant for Dark Matter Indirect Detection
• The cosmic-ray electron flux measured by the PAMELA experiment between 1 and 625 GeV
• Exciting Dark Matter and the INTEGRAL/SPI 511 keV signal
• Cosmological puzzle resolved by stellar feedback in high redshift galaxies
• A blueprint for detecting supersymmetric dark matter in the Galactic halo
• On possible interpretations of the high energy electron-positron spectrum measured by the Fermi Large Area Telescope
• Constraints on WIMP Dark Matter from the High Energy PAMELA $\bar{p}/p$ data
• Gamma-ray and radio tests of the e+e- excess from DM annihilations
• Inverse Compton Origin of the Hard X-Ray and Soft Gamma-Ray Emission from the Galactic Ridge
• PAMELA data and leptonically decaying dark matter
• Galactic secondary positron flux at the Earth
• Pulsars versus Dark Matter Interpretation of ATIC/PAMELA
• Precise constraints on the dark matter content of Milky Way dwarf galaxies for gamma-ray experiments
• Updated CMB constraints on Dark Matter annihilation cross-sections
• Impact of dark matter decays and annihilations on reionization
• Dark matter interpretation of recent electron and positron data
• The Most Dark Matter Dominated Galaxies: Predicted Gamma-ray Signals from the Faintest Milky Way Dwarfs
• Contraints on radiative dark-matter decay from the cosmic microwave background
• Inverse Compton constraints on the Dark Matter e+e- excesses
• TeV gamma-rays and the largest masses and annihilation cross sections of neutralino dark matter
• Constraining DM properties with SPI
• Testing astrophysical models for the PAMELA positron excess with cosmic ray nuclei
• Indirect Dark Matter Detection from Dwarf Satellites: Joint Expectations from Astrophysics and Supersymmetry
• Multi-wavelength signals of dark matter annihilations at the Galactic center
• Bounds on Cross-sections and Lifetimes for Dark Matter Annihilation and Decay into Charged Leptons from Gamma-ray Observations of Dwarf Galaxies
• The impacts of dark matter particle annihilation on recombination and the anisotropies of the cosmic microwave background
• H.E.S.S. constraints on Dark Matter annihilations towards the Sculptor and Carina Dwarf Galaxies
• Cosmic rays from Leptonic Dark Matter
• High Energy Positrons and the WMAP Haze from Exciting Dark Matter
• Continuum gamma-ray emission from light dark matter positrons and electrons
• The galactic 511 keV line from electroweak scale WIMPs
• Dark matter and pulsar signals for Fermi LAT, PAMELA, ATIC, HESS and WMAP data
• Gamma Rays from Clusters and Groups of Galaxies: Cosmic Rays versus Dark Matter
• Search for the light dark matter with an X-ray spectrometer
• Anisotropy probe of galactic and extra-galactic Dark Matter annihilations
• Indirect Dark Matter Detection Limits from the Ultra-Faint Milky Way Satellite Segue 1
• Challenges in Detecting Gamma-Rays From Dark Matter Annihilations in the Galactic Center
• Gamma Rays From The Galactic Center and the WMAP Haze
• Radio constraints on dark matter annihilation in the galactic halo and its substructures
• A Search for Dark Matter Annihilation with the Whipple 10m Telescope
• Optimal angular window for observing Dark Matter annihilation from the Galactic Center region: the case of gamma-ray lines
• The cosmic X-ray and gamma-ray background from dark matter annihilation
• Complementarity of Galactic radio and collider data in constraining WIMP dark matter models
• Dark Matter annihilation in Draco: new considerations of the expected gamma flux
• SZ effect from Dark Matter annihilation
• Testing the Dark Matter Interpretation of the PAMELA Excess through Measurements of the Galactic Diffuse Emission
• Multi-wavelength Searches for Particle Dark Matter
• Photons from Dark Matter in a (non-Universal) Extra Dimension model
• SZ effects from annihilating dark matter in the Milky Way: smooth halo, subhalos and intermediate-mass-black-holes

Cited by in corpus (5)

• Updated cosmic-ray and radio constraints on light dark matter: Implications for the GeV gamma-ray excess at the Galactic center
• Fitting the Fermi-LAT GeV excess: On the importance of including the propagation of electrons from dark matter
• Revisiting the constraints on annihilating dark matter by radio observational data of M31
• Dark Matter Annihilation Feedback in cosmological simulations I: Code convergence and idealised halos
• Predicting interstellar radiation fields from chemical evolution models