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We present constraints on cosmological and astrophysical parameters fromhigh-resolution microwave background maps at 148 GHz and 218 GHz made by theAtacama Cosmology Telescope (ACT) in three seasons of observations from 2008 to2010. A model of primary cosmological and secondary foreground parameters isfit to the map power spectra and lensing deflection power spectrum, includingcontributions from both the thermal Sunyaev-Zeldovich (tSZ) effect and thekinematic Sunyaev-Zeldovich (kSZ) effect, Poisson and correlated anisotropyfrom unresolved infrared sources, radio sources, and the correlation betweenthe tSZ effect and infrared sources. The power ell^2 C_ell/2pi of the thermalSZ power spectrum at 148 GHz is measured to be 3.4 +\- 1.4 muK^2 at ell=3000,while the corresponding amplitude of the kinematic SZ power spectrum has a 95%confidence level upper limit of 8.6 muK^2. Combining ACT power spectra with theWMAP 7-year temperature and polarization power spectra, we find excellentconsistency with the LCDM model. We constrain the number of effectiverelativistic degrees of freedom in the early universe to be Neff=2.79 +\- 0.56,in agreement with the canonical value of Neff=3.046 for three masslessneutrinos. We constrain the sum of the neutrino masses to be Sigma m_nu < 0.39eV at 95% confidence when combining ACT and WMAP 7-year data with BAO andHubble constant measurements. We constrain the amount of primordial helium tobe Yp = 0.225 +\- 0.034, and measure no variation in the fine structureconstant alpha since recombination, with alpha/alpha0 = 1.004 +/- 0.005. Wealso find no evidence for any running of the scalar spectral index, dns/dlnk =-0.004 +\- 0.012.

The Atacama Cosmology Telescope: Cosmological parameters from three seasons of data