Galactic synchrotron emission from WIMPs at radio frequencies

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 assu...

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Bibliographic Details
Published in:Journal of cosmology and astroparticle physics 2012-01, Vol.2012 (1), p.005-24
Main Authors: Fornengo, Nicolao, Lineros, Roberto A, Regis, Marco, Taoso, Marco
Format: Article
Language:English
Subjects:
ANNIHILATION
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Channels
COMPARATIVE EVALUATIONS
COSMIC RAY PROPAGATION
COSMOLOGY
CROSS SECTIONS
Dark matter
ELECTRONS
GEV RANGE
MAGNETIC FIELDS
Mathematical analysis
MHZ RANGE
MILKY WAY
NONLUMINOUS MATTER
POSITRONS
Radio
RADIOWAVE RADIATION
RELATIVISTIC RANGE
Surveys
SYNCHROTRON RADIATION
Synchrotrons
WIMPS
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Description
Summary: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][upsilon]) = 3 x 10 super(-26) cm super(3) s super(-1), and masses M sub(DM) [lap] 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.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2012/01/005