Dark matter and synchrotron emission from galactic center radio filaments

Tim Linden*, Dan Hooper, Farhad Yusef-Zadeh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

The inner degrees of the Galactic center contain a large population of filamentary structures observed at radio frequencies. These so-called non-thermal radio filaments (NRFs) trace magnetic field lines and have attracted significant interest due to their hard (Sv ν -0.1 ± 0.4) synchrotron emission spectra. The origin of these filaments remains poorly understood. We show that the electrons and positrons created through the annihilations of a relatively light (∼5-10 GeV) dark matter particle with the cross section predicted for a simple thermal relic can provide a compelling match to the intensity, spectral shape, and flux variation of the NRFs. Furthermore, the characteristics of the dark matter particle necessary to explain the synchrotron emission from the NRFs are consistent with those required to explain the excess γ-ray emission observed from the Galactic center by the Fermi Large Area Telescope, as well as the direct detection signals observed by CoGeNT and DAMA/LIBRA.

Original languageEnglish (US)
Article number95
JournalAstrophysical Journal
Volume741
Issue number2
DOIs
StatePublished - Nov 10 2011

Keywords

  • Galaxy: center
  • ISM: magnetic fields
  • acceleration of particles
  • dark matter
  • diffusion
  • radiation mechanisms: non-thermal
  • radio continuum: ISM

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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