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

  • Jonathan L. Sievers
  • , Renée A. Hlozek
  • , Michael R. Nolta
  • , Viviana Acquaviva
  • , Graeme E. Addison
  • , Peter A.R. Ade
  • , Paula Aguirre
  • , Mandana Amiri
  • , 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 Dünner, 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 Hernández-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
  • Princeton University
  • University of Toronto
  • City University of New York
  • University of British Columbia
  • University of Oxford
  • Cardiff University
  • Pontificia Universidad Católica de Chile
  • University of Rome La Sapienza
  • Carnegie Mellon University
  • University of Pittsburgh
  • NASA Goddard Space Flight Center
  • Johns Hopkins University
  • Lawrence Berkeley National Laboratory
  • Argonne National Laboratory
  • University of Pennsylvania
  • National Institute of Standards and Technology
  • Max Planck Institute for Astrophysics
  • University of Nottingham
  • University of KwaZulu-Natal
  • University of Miami
  • Instituto Nacional de Astrofisica Optica y Electronica
  • Rutgers - The State University of New Jersey, New Brunswick
  • West Chester University
  • Columbia University
  • The University of Tokyo
  • Academia Sinica - Institute of Astronomy and Astrophysics
  • University of California at Santa Barbara
  • Arizona State University
  • Cornell University
  • Haverford College
  • The University of Chicago
  • University of Massachusetts

Research output: Contribution to journalArticlepeer-review

281 Scopus citations

Abstract

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 ℓ2Cℓ/2π of the thermal SZ power spectrum at 148 GHz is measured to be 3.4±1.4 μK2 at ℓ = 3000, while the corresponding amplitude of the kinematic SZ power spectrum has a 95% confidence level upper limit of 8.6 μK2. 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 Σmν < 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 α since recombination, with α/α0 = 1.004±0.005. We also find no evidence for any running of the scalar spectral index, dns/dln k = -0.004±0.012.

Original languageEnglish
Article number060
JournalJournal of Cosmology and Astroparticle Physics
Volume2013
Issue number10
DOIs
StatePublished - Oct 2013

Keywords

  • CMBR experiments
  • cosmological parameters from CMBR
  • physics of the early universe
  • Sunyaev-Zeldovich effect

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