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The extraction of a 'haze' from the WMAP microwave skymaps is based onsubtraction of known foregrounds, viz. free-free (bremsstrahlung), thermal dustand synchrotron, each traced by other skymaps. While the 408 MHz all-sky surveyis used for the synchrotron template, the WMAP bands are at tens of GHz wherethe spatial distribution of the radiating cosmic ray electrons ought to bequite different because of the energy-dependence of their diffusion in theGalaxy. The systematic uncertainty this introduces in the residual skymap iscomparable to the claimed haze and can, for certain source distributions, havea very similar spectrum and latitudinal profile and even a somewhat similarmorphology. Hence caution must be exercised in interpreting the 'haze' as aphysical signature of, e.g., dark matter annihilation in the Galactic centre.

Systematic effects in the extraction of the 'WMAP haze'