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We present the temperature power spectra of the cosmic microwave background(CMB) derived from the three seasons of data from the Atacama CosmologyTelescope (ACT) at 148 GHz and 218 GHz, as well as the cross-frequency spectrumbetween the two channels. We detect and correct for contamination due to theGalactic cirrus in our equatorial maps. We present the results of a number oftests for possible systematic error and conclude that any effects are notsignificant compared to the statistical errors we quote. Where they overlap, wecross-correlate the ACT and the South Pole Telescope (SPT) maps and show theyare consistent. The measurements of higher-order peaks in the CMB powerspectrum provide an additional test of the Lambda CDM cosmological model, andhelp constrain extensions beyond the standard model. The small angular scalepower spectrum also provides constraining power on the Sunyaev-Zel'dovicheffects and extragalactic foregrounds. We also present a measurement of the CMBgravitational lensing convergence power spectrum at 4.6-sigma detectionsignificance.

The Atacama Cosmology Telescope: Temperature and Gravitational Lensing Power Spectrum Measurements from Three Seasons of Data