The Atacama Cosmology Telescope: Two-season ACTPol spectra and parameters

Thibaut Louis, Emily Grace, Matthew Hasselfield, Marius Lungu, Loïc Maurin, Graeme E. Addison, Peter A.R. Ade, Simone Aiola, Rupert Allison, Mandana Amiri, Elio Angile, Nicholas Battaglia, James A. Beall, Francesco De Bernardis, J. Richard Bond, Joe Britton, Erminia Calabrese, Hsiao Mei Cho, Steve K. Choi, Kevin CoughlinDevin Crichton, Kevin Crowley, Rahul Datta, Mark J. Devlin, Simon R. Dicker, Joanna Dunkley, Rolando Dünner, Simone Ferraro, Anna E. Fox, Patricio Gallardo, Megan Gralla, Mark Halpern, Shawn Henderson, J. Colin Hill, Gene C. Hilton, Matt Hilton, Adam D. Hincks, Renée Hlozek, S. P. Patty Ho, Zhiqi Huang, Johannes Hubmayr, Kevin M. Huffenberger, John P. Hughes, Leopoldo Infante, Kent Irwin, Simon Muya Kasanda, Jeff Klein, Brian Koopman, Arthur Kosowsky, Dale Li, Mathew Madhavacheril, Tobias A. Marriage, Jeff McMahon, Felipe Menanteau, Kavilan Moodley, Charles Munson, Sigurd Naess, Federico Nati, Laura Newburgh, John Nibarger, Michael D. Niemack, Michael R. Nolta, Carolina Nuñez, Lyman A. Page, Christine Pappas, Bruce Partridge, Felipe Rojas, Emmanuel Schaan, Benjamin L. Schmitt, Neelima Sehgal, Blake D. Sherwin, Jon Sievers, Sara Simon, David N. Spergel, Suzanne T. Staggs, Eric R. Switzer, Robert Thornton, Hy Trac, Jesse Treu, Carole Tucker, Alexander Van Engelen, Jonathan T. Ward, Edward J. Wollack

Research output: Contribution to journalArticlepeer-review


We present the temperature and polarization angular power spectra measured by the Atacama Cosmology Telescope Polarimeter (ACTPol). We analyze night-time data collected during 2013-14 using two detector arrays at 149 GHz, from 548 deg2 of sky on the celestial equator. We use these spectra, and the spectra measured with the MBAC camera on ACT from 2008-10, in combination with planck and wmap data to estimate cosmological parameters from the temperature, polarization, and temperature-polarization cross-correlations. We find the new ACTPol data to be consistent with the ΛCDM model. The ACTPol temperature-polarization cross-spectrum now provides stronger constraints on multiple parameters than the ACTPol temperature spectrum, including the baryon density, the acoustic peak angular scale, and the derived Hubble constant. The new ACTPol data provide information on damping tail parameters. The joint uncertainty on the number of neutrino species and the primordial helium fraction is reduced by 20% when adding ACTPol to Planck temperature data alone.

Original languageEnglish (US)
Article number031
JournalJournal of Cosmology and Astroparticle Physics
Issue number6
StatePublished - Jun 15 2017


  • CMBR experiments
  • CMBR polarisation
  • cosmological parameters from CMBR

ASJC Scopus subject areas

  • Astronomy and Astrophysics


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