The Atacama Cosmology Telescope: Cosmological parameters from three seasons of data
Creators: name: Sievers, Jonathan L.
name: Hlozek, Renée A.
name: Nolta, Michael R.
name: Acquaviva, Viviana
name: Addison, Graeme E.
name: Ade, Peter A. R.
name: Aguirre, Paula
name: Amiri, Mandana
name: Appel, John William
name: Barrientos, L. Felipe
name: Battistelli, Elia S.
name: Battaglia, Nick
name: Bond, J. Richard
name: Brown, Ben
name: Burger, Bryce
name: Calabrese, Erminia
name: Chervenak, Jay
name: Crichton, Devin
name: Das, Sudeep
name: Devlin, Mark J.
name: Dicker, Simon R.
name: Doriese, W. Bertrand
name: Dunkley, Joanna
name: Dünner, Rolando
name: Essinger-Hileman, Thomas
name: Faber, David
name: Fisher, Ryan P.
name: Fowler, Joseph W.
name: Gallardo, Patricio
name: Gordon, Michael S.
name: Gralla, Megan B.
name: Hajian, Amir
name: Halpern, Mark
name: Hasselfield, Matthew
name: Hernández-Monteagudo, Carlos
name: Hill, J. Colin
name: Hilton, Gene C.
name: Hilton, Matt
name: Hincks, Adam D.
name: Holtz, Dave
name: Huffenberger, Kevin M.
name: Hughes, David H.
name: Hughes, John P.
name: Infante, Leopoldo
name: Irwin, Kent D.
name: Jacobson, David R.
name: Johnstone, Brittany
name: Juin, Jean Baptiste
name: Kaul, Madhuri
name: Klein, Jeff
name: Kosowsky, Arthur
name: Lau, Judy M
name: Limon, Michele
name: Lin, Yen-Ting
name: Louis, Thibaut
name: Lupton, Robert H.
name: Marriage, Tobias A.
name: Marsden, Danica
name: Martocci, Krista
name: Mauskopf, Phil
name: McLaren, Michael
name: Menanteau, Felipe
name: Moodley, Kavilan
name: Moseley, Harvey
name: Netterfield, Calvin B
name: Niemack, Michael D.
name: Page, Lyman A.
name: Page, William A.
name: Parker, Lucas
name: Partridge, Bruce
name: Plimpton, Reed
name: Quintana, Hernan
name: Reese, Erik D.
name: Reid, Beth
name: Rojas, Felipe
name: Sehgal, Neelima
name: Sherwin, Blake D.
name: Schmitt, Benjamin L.
name: Spergel, David N.
name: Staggs, Suzanne T.
name: Stryzak, Omelan
name: Swetz, Daniel S.
name: Switzer, Eric R.
name: Thornton, Robert
name: Trac, Hy
name: Tucker, Carole
name: Uehara, Masao
name: Visnjic, Katerina
name: Warne, Ryan
name: Wilson, Grant
name: Wollack, Ed
name: Zhao, Yue
name: Zunckel, Caroline
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We present constraints on cosmological and astrophysical parameters from high-resolution microwave background maps at 148 GHz and 218 GHz made by the Atacama Cosmology Telescope (ACT) in three seasons of observations from 2008 to 2010. A model of primary cosmological and secondary foreground parameters is fit to the map power spectra and lensing deflection power spectrum, including contributions from both the thermal Sunyaev-Zeldovich (tSZ) effect and the kinematic Sunyaev-Zeldovich (kSZ) effect, Poisson and correlated anisotropy from unresolved infrared sources, radio sources, and the correlation between the tSZ effect and infrared sources. The power ell^2 C_ell/2pi of the thermal SZ 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 the WMAP 7-year temperature and polarization power spectra, we find excellent consistency with the LCDM model. We constrain the number of effective relativistic 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 massless neutrinos. We constrain the sum of the neutrino masses to be Sigma m_nu &lt; 0.39 eV at 95% confidence when combining ACT and WMAP 7-year data with BAO and Hubble constant measurements. We constrain the amount of primordial helium to be Yp = 0.225 +\- 0.034, and measure no variation in the fine structure constant alpha since recombination, with alpha/alpha0 = 1.004 +/- 0.005. We also find no evidence for any running of the scalar spectral index, dns/dlnk = -0.004 +\- 0.012.
description: 26 pages, 22 figures. This paper is a companion to Das et al. (2013) and Dunkley et al. (2013). Matches published JCAP version