Galactic synchrotron emission from WIMPs at radio frequencies

Details Galactic synchrotron emission from WIMPs at radio frequencies Galactic synchrotron emission from WIMPs at radio frequencies

2011-10-19

arxiv.org/abs/1110.4337v2

JCAP01(2012)005

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

25 pages, 9 figures. Published JCAP version

Scientific paper

10.1088/1475-7516/2012/01/005

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.

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