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arxiv: 1301.0824 · v3 · submitted 2013-01-04 · 🌌 astro-ph.CO

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

Jonathan L. Sievers , Ren\'ee A. Hlozek , Michael R. Nolta , Viviana Acquaviva , Graeme E. Addison , Peter A. R. Ade , Paula Aguirre , Mandana Amiri
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John William Appel L. Felipe Barrientos Elia S. Battistelli Nick Battaglia J. Richard Bond Ben Brown Bryce Burger Erminia Calabrese Jay Chervenak Devin Crichton Sudeep Das Mark J. Devlin Simon R. Dicker W. Bertrand Doriese Joanna Dunkley Rolando D\"unner Thomas Essinger-Hileman David Faber Ryan P. Fisher Joseph W. Fowler Patricio Gallardo Michael S. Gordon Megan B. Gralla Amir Hajian Mark Halpern Matthew Hasselfield Carlos Hern\'andez-Monteagudo J. Colin Hill Gene C. Hilton Matt Hilton Adam D. Hincks Dave Holtz Kevin M. Huffenberger David H. Hughes John P. Hughes Leopoldo Infante Kent D. Irwin David R. Jacobson Brittany Johnstone Jean Baptiste Juin Madhuri Kaul Jeff Klein Arthur Kosowsky Judy M Lau Michele Limon Yen-Ting Lin Thibaut Louis Robert H. Lupton Tobias A. Marriage Danica Marsden Krista Martocci Phil Mauskopf Michael McLaren Felipe Menanteau Kavilan Moodley Harvey Moseley Calvin B Netterfield Michael D. Niemack Lyman A. Page William A. Page Lucas Parker Bruce Partridge Reed Plimpton Hernan Quintana Erik D. Reese Beth Reid Felipe Rojas Neelima Sehgal Blake D. Sherwin Benjamin L. Schmitt David N. Spergel Suzanne T. Staggs Omelan Stryzak Daniel S. Swetz Eric R. Switzer Robert Thornton Hy Trac Carole Tucker Masao Uehara Katerina Visnjic Ryan Warne Grant Wilson Ed Wollack Yue Zhao Caroline Zunckel
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classification 🌌 astro-ph.CO
keywords powerconstraincosmologicaleffectparameterssourcesspectraspectrum
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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 < 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.

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