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We use data from the first 100 square-degree field observed by the South PoleTelescope (SPT) in 2008 to measure the angular power spectrum of temperatureanisotropies contributed by the background of dusty star-forming galaxies(DSFGs) at millimeter wavelengths. From the auto and cross-correlation of 150and 220 GHz SPT maps, we significantly detect both Poisson distributed and, forthe first time at millimeter wavelengths, clustered components of power from abackground of DSFGs. The spectral indices between 150 and 220 GHz of thePoisson and clustered components are found to be 3.86 +- 0.23 and 3.8 +- 1.3respectively, implying a steep scaling of the dust emissivity index beta ~ 2.The Poisson and clustered power detected in SPT, BLAST (at 600, 860, and 1200GHz), and Spitzer (1900 GHz) data can be understood in the context of a simplemodel in which all galaxies have the same graybody spectrum with dustemissivity index of beta = 2 and dust temperature T_d = 34 K. In this model,half of the 150 GHz background light comes from redshifts greater than 3.2. Wealso use the SPT data to place an upper limit on the amplitude of the kineticSunyaev-Zel'dovich power spectrum at l = 3000 of 13 uK^2 at 95% confidence.

Angular Power Spectra of the Millimeter Wavelength Background Light from Dusty Star-forming Galaxies with the South Pole Telescope