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R. Bond, J. Sievers, J. W. Appel, J. W. Fowler, K. D. Irwin, K. M. Huffenberger, K. Moodley, L. A. Page, L. F. Barrientos, L. Infante, L. Parker, M. Amiri, M. D. Niemack, M. Halpern, M. Hasselfield, M. Hilton, M. J. Devlin, M. Kaul, M. Limon, M. R. Nolta, N. Sehgal, P. Aguirre, P. A. R. Ade, P. Mauskopf, R. Dunner, R. Hlozek, R. H. Lupton, R. P. Fisher, R. Thornton, R. Warne, S. Das, S. R. Dicker, S. T. Staggs, T. A. Marriage, T. Essinger-Hileman, V. Acquaviva, W. Bertrand Doriese, Y-T. Lin, Y. Zhao","submitted_at":"2010-09-04T20:05:06Z","abstract_excerpt":"We present cosmological parameters derived from the angular power spectrum of the cosmic microwave background (CMB) radiation observed at 148 GHz and 218 GHz over 296 deg^2 with the Atacama Cosmology Telescope (ACT) during its 2008 season. ACT measures fluctuations at scales 500<l<10000. We fit a model for the lensed CMB, Sunyaev-Zel'dovich (SZ), and foreground contribution to the 148 GHz and 218 GHz power spectra, including thermal and kinetic SZ, Poisson power from radio and infrared point sources, and clustered power from infrared point sources. 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D. Hincks, A. Hajian, A. Kosowsky, B. Brown, B. Burger, B. Partridge, B. Reid, B. Sherwin, C. B Netterfield, C. Hernandez-Monteagudo, C. Tucker, D. H. Hughes, D. Marsden, D. N. Spergel, D. S. Swetz, E. R. Switzer, E. S. Battistelli, E. Wollack, F. Menanteau, G. C. Hilton, H. Moseley, H. Trac, J. B. Juin, J. Chervenak, J. Dunkley, J. Klein, J. M Lau, J. P. Hughes, J. R. Bond, J. Sievers, J. W. Appel, J. W. Fowler, K. D. Irwin, K. M. Huffenberger, K. Moodley, L. A. Page, L. F. Barrientos, L. Infante, L. Parker, M. Amiri, M. D. Niemack, M. Halpern, M. Hasselfield, M. Hilton, M. J. Devlin, M. Kaul, M. Limon, M. R. Nolta, N. Sehgal, P. Aguirre, P. A. R. Ade, P. Mauskopf, R. Dunner, R. Hlozek, R. H. Lupton, R. P. Fisher, R. Thornton, R. Warne, S. Das, S. R. Dicker, S. T. Staggs, T. A. Marriage, T. Essinger-Hileman, V. Acquaviva, W. Bertrand Doriese, Y-T. Lin, Y. 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