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We study the Sunyaev-Zel'dovich effect potentially generated by relativisticelectrons injected from dark matter annihilation or decay in the Galaxy, andcheck whether it could be observed by Planck or the Atacama Large MillimeterArray (ALMA), or even imprint the current CMB data as, e.g., the specificfluctuation excess claimed from an recent reanalysis of the WMAP-5 data. Wefocus on high-latitude regions to avoid contamination of the Galacticastrophysical electron foreground, and consider the annihilation or decaycoming from the smooth dark matter halo as well as from subhalos, furtherextending our analysis to a generic modeling of spikes arising aroundintermediate-mass black holes. We show that all these dark Galactic componentsare unlikely to produce any observable Sunyaev-Zel'dovich effect. For aself-annihilating dark matter particle of 10 GeV with canonical properties, thelargest optical depth we find is $\tau_e \lesssim 10^{-7}$ for massive isolatedsubhalos hosting intermediate-mass black holes. We conclude that dark matterannihilation or decay on the Galactic scale cannot lead to significantSunyaev-Zel'dovich distortions of the CMB spectrum.

SZ effects from annihilating dark matter in the Milky Way: smooth halo, subhalos and intermediate-mass-black-holes