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The Sunyaev-Zel'dovich (SZ) effect has a distinct spectral signature thatallows its separation from fluctuations in the cosmic microwave background(CMB) and foregrounds. Using CMB anisotropies measured in Wilkinson MicrowaveAnisotropy Probe's five-year maps, we constrain the SZ fluctuations at large,degree angular scales corresponding to multipoles in the range from 10 to 400.We provide upper bounds on SZ fluctuations at multipoles greater than 50, andfind evidence for a hemispherically asymmetric signal at ten degrees angularscales. The amplitude of the detected signal cannot be easily explained withthe allowed number density and temperature of electrons in the Galactic halo.We have failed to explain the excess signal as a residual from known Galacticforegrounds or instrumental uncertainties such as 1/f-noise.

Constraints on the SZ Power Spectrum on Degree Angular Scales in WMAP Data