"This excess diffuse emission is centered on the Galac-
tic center, and can be parameterized by a simple two-
dimensional Gaussian template (` = 15, b = 25).
The template-correlated spectrum of this emission is sig-
nificantly harder than either 0 emission or ICS from
softer electrons, whose fitted spectra agree well with
models. This harder spectrum coupled with the distinct
spatial morphology of the gamma-ray and microwave
haze are evidence that these electrons originate from a
separate component than the softer SN shock-accelerated
electrons."
http://arxiv.org/PS_cache/arxiv/pdf/0910/0910.4583v1.pdf THE FERMI HAZE:
A GAMMA-RAY COUNTERPART TO THE MICROWAVE HAZE
Gregory Dobler,1,2,5 Douglas P. Finkbeiner,1,3 Ilias Cholis,4
Tracy Slatyer,1,3 & Neal Weiner4
Reread pages 335-351 of Witt's book and it you will find an identical argument with an explination. Unless you want me to transcribe those pages for you to read here.