6533b85cfe1ef96bd12bca6d
RESEARCH PRODUCT
Galactic synchrotron emission from WIMPs at radio frequencies
Marco RegisMarco TaosoRoberto A. LinerosNicolao Fornengosubject
PhysicsAnnihilation010308 nuclear & particles physicsAstrophysics::High Energy Astrophysical PhenomenaDark matterFOS: Physical sciencesSynchrotron radiationAstronomy and AstrophysicsCosmic rayAstrophysicsElectronAstrophysics::Cosmology and Extragalactic Astrophysics7. Clean energy01 natural sciencesAstrophysics - Astrophysics of GalaxiesSynchrotronlaw.inventionGalactic haloPositronlawAstrophysics of Galaxies (astro-ph.GA)0103 physical sciences010303 astronomy & astrophysicsdescription
Dark matter annihilations in the Galactic halo inject relativistic electrons and positrons which in turn generate a synchrotron radiation when interacting with the galactic magnetic field. We calculate the synchrotron flux for various dark matter annihilation channels, masses, and astrophysical assumptions in the low-frequency range and compare our results with radio surveys from 22 MHz to 1420 MHz. We find that current observations are able to constrain particle dark matter with "thermal" annihilation cross-sections, i.e. (\sigma v) = 3 x 10^-26 cm^3/s, and masses M_DM < 10 GeV. We discuss the dependence of these bounds on the astrophysical assumptions, namely galactic dark matter distribution, cosmic rays propagation parameters, and structure of the galactic magnetic field. Prospects for detection in future radio surveys are outlined.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2011-10-19 |