W-WIMP Annihilation as a Source of the Fermi Bubbles

Understand

The Fermi Gamma-ray Space Telescope discovered two \gamma-ray emitting bubble-shaped structures that extend nearly symmetrically on either side of our Galaxy and appear morphologically connected to the Galactic center.

• The origin of the emission is still not entirely clear.
• It was recently shown that the spectral shape of the emission from the Fermi bubbles is well described by an approximately 50 GeV dark matter particle annihilating to b \bar b, with a normalization corresponding to a velocity average annihilation cross section of < \sigma_b v > ~ 8 \times 10^{-27} cm^3/s.
• We study the minimal hidden sector recently introduced by Weinberg and examine to what extent its weakly-interacting massive particles (W-WIMPs) are capable of accommodating both the desired effective annihilation rate into quarks and the observed relic density.