The Atacama Cosmology Telescope: Cosmological parameters from three seasons of data
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 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.
Keywords
Cite
@article{arxiv.1301.0824,
title = {The Atacama Cosmology Telescope: Cosmological parameters from three seasons of data},
author = {Jonathan L. Sievers and Renée A. Hlozek and Michael R. Nolta and Viviana Acquaviva and Graeme E. Addison and Peter A. R. Ade and Paula Aguirre and Mandana Amiri and John William Appel and L. Felipe Barrientos and Elia S. Battistelli and Nick Battaglia and J. Richard Bond and Ben Brown and Bryce Burger and Erminia Calabrese and Jay Chervenak and Devin Crichton and Sudeep Das and Mark J. Devlin and Simon R. Dicker and W. Bertrand Doriese and Joanna Dunkley and Rolando Dünner and Thomas Essinger-Hileman and David Faber and Ryan P. Fisher and Joseph W. Fowler and Patricio Gallardo and Michael S. Gordon and Megan B. Gralla and Amir Hajian and Mark Halpern and Matthew Hasselfield and Carlos Hernández-Monteagudo and J. Colin Hill and Gene C. Hilton and Matt Hilton and Adam D. Hincks and Dave Holtz and Kevin M. Huffenberger and David H. Hughes and John P. Hughes and Leopoldo Infante and Kent D. Irwin and David R. Jacobson and Brittany Johnstone and Jean Baptiste Juin and Madhuri Kaul and Jeff Klein and Arthur Kosowsky and Judy M Lau and Michele Limon and Yen-Ting Lin and Thibaut Louis and Robert H. Lupton and Tobias A. Marriage and Danica Marsden and Krista Martocci and Phil Mauskopf and Michael McLaren and Felipe Menanteau and Kavilan Moodley and Harvey Moseley and Calvin B Netterfield and Michael D. Niemack and Lyman A. Page and William A. Page and Lucas Parker and Bruce Partridge and Reed Plimpton and Hernan Quintana and Erik D. Reese and Beth Reid and Felipe Rojas and Neelima Sehgal and Blake D. Sherwin and Benjamin L. Schmitt and David N. Spergel and Suzanne T. Staggs and Omelan Stryzak and Daniel S. Swetz and Eric R. Switzer and Robert Thornton and Hy Trac and Carole Tucker and Masao Uehara and Katerina Visnjic and Ryan Warne and Grant Wilson and Ed Wollack and Yue Zhao and Caroline Zunckel},
journal= {arXiv preprint arXiv:1301.0824},
year = {2015}
}
Comments
26 pages, 22 figures. This paper is a companion to Das et al. (2013) and Dunkley et al. (2013). Matches published JCAP version