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

2017; Institute of Physics; Volume: 2017; Issue: 06 Linguagem: Inglês

10.1088/1475-7516/2017/06/031

1475-7516

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

Astrophysics and Cosmic Phenomena

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 deg$^2$ 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 LCDM 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. Adding the new data to planck temperature data tightens the limits on damping tail parameters, for example reducing the joint uncertainty on the number of neutrino species and the primordial helium fraction by 20%.