Radio constraints on dark matter annihilation in the galactic halo and its substructures

Abstract

Annihilation of Dark Matter usually produces together with gamma rays comparable amounts of electrons and positrons. The e+e- gyrating in the galactic magnetic field then produce secondary synchrotron radiation which thus provides an indirect mean to constrain the DM signal itself. To this purpose, we calculate the radio emission from the galactic halo as well as from its expected substructures and we then compare it with the measured diffuse radio background. We employ a multi-frequency approach using data in the relevant frequency range 100 MHz-100 GHz, as well as the WMAP Haze data at 23 GHz. The derived constraints are of the order <sigma_A*v>=10^{-24} cm3 s^{-1} for a DM mass m_chi=100 GeV sensibly depending however on the astrophysical uncertainties, in particular on the assumption on the galactic magnetic field model. The signal from single bright clumps is instead largely attenuated by diffusion effects and offers only poor detection perspectives.

12 pages, 7 figures; v2: some references added, some discussions enlarged; matches journal version

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• Extended Anomalous Foreground Emission in the WMAP 3-Year Data
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Cited by in corpus (21)

• Gamma-ray and radio tests of the e+e- excess from DM annihilations
• Constraints on the Galactic Halo Dark Matter from Fermi-LAT Diffuse Measurements
• Constraining Very Heavy Dark Matter Using Diffuse Backgrounds of Neutrinos and Cascaded Gamma Rays
• Dark Matter Signals from Cascade Annihilations
• Particle Physics Implications for CoGeNT, DAMA, and Fermi
• Galactic Center Radio Constraints on Gamma-Ray Lines from Dark Matter Annihilation
• Background reionization history from omniscopes
• Galactic Signatures of Decaying Dark Matter
• Radio emission from dark matter annihilation in the Large Magellanic Cloud
• Diffuse gamma-ray background and cosmic-ray positrons from annihilating dark matter
• Revisiting the constraints on annihilating dark matter by radio observational data of M31
• The impact of propagation uncertainties on the potential Dark Matter contribution to the Fermi LAT mid-latitude gamma-ray data
• Multi-wavelength Searches for Particle Dark Matter
• Searching for Dark Matter Signals from Local Dwarf Spheroidal Galaxies at Low Radio Frequencies in the GLEAM Survey
• Analysing the radio flux density profile of the M31 galaxy: a possible dark matter interpretation
• Radio bounds on the mixed dark matter scenarios of primordial black holes and WIMPs
• Cosmic ray backgrounds for dark matter indirect detection
• A Search for Annihilating Dark Matter in 47 Tucanae and Omega Centauri
• Indirect evidence of GeV Dark Matter
• Dark Matter constraints from Planck observations of the Galactic polarized synchrotron emission
• Contribution of dark matter annihilation to gamma-ray burst afterglows near massive galaxy centers