The Fermi Haze from Dark Matter Annihilations and Anisotropic Diffusion

Details The Fermi Haze from Dark Matter Annihilations and Anisotropic Diffusion The Fermi Haze from Dark Matter Annihilations and Anisotropic Diffusion

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21743210d&link_type=abstract

American Astronomical Society, AAS Meeting #217, #432.10; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astrophysics

Scientific paper

Recently we identified a large extended diffuse gamma-ray structure
towards the Galactic center in full sky gamma-ray maps produced by the
Fermi Gamma-Ray Space Telescope. This feature was dubbed the Fermi
"haze" (Dobler et al. 2010) and more recently the Fermi "bubbles" (Su
et al 2010). The Fermi haze is hard spectrum inverse Compton
radiation from a population of energetic electrons that are too hard
to be produced by typical astrophysical mechanisms, such as supernova
shocks. While more exotic astrophysical scenarios may be plausible,
here we explore the possibility that the hard spectrum electrons are
due to dark matter annihlations in the Galactic halo and are
propagated to the required volume by anisotropic diffusion effects.
We develop a self-consistent anisotropic diffusion model and show that
both the morphology and spectrum are well fit by the model. In
addition, this model (which utilizes an XDM model for the dark matter
particle with a self-annihilation cross section Sommerfeld enhancement
of 100) also produces the microwave synchrotron haze and locally
observed cosmic-ray excesses by Fermi and PAMELA.

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