The Atacama Cosmology Telescope: Two-Season ACTPol Spectra and Parameters
Abstract
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 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%.
Keywords
Cite
@article{arxiv.1610.02360,
title = {The Atacama Cosmology Telescope: Two-Season ACTPol Spectra and Parameters},
author = {Thibaut Louis and Emily Grace and Matthew Hasselfield and Marius Lungu and Loïc Maurin and Graeme E. Addison and Peter A. R. Ade and Simone Aiola and Rupert Allison and Mandana Amiri and Elio Angile and Nicholas Battaglia and James A. Beall and Francesco de Bernardis and J. Richard Bond and Joe Britton and Erminia Calabrese and Hsiao-mei Cho and Steve K. Choi and Kevin Coughlin and Devin Crichton and Kevin Crowley and Rahul Datta and Mark J. Devlin and Simon R. Dicker and Joanna Dunkley and Rolando Dünner and Simone Ferraro and Anna E. Fox and Patricio Gallardo and Megan Gralla and Mark Halpern and Shawn Henderson and J. Colin Hill and Gene C. Hilton and Matt Hilton and Adam D. Hincks and Renée Hlozek and S. P. Patty Ho and Zhiqi Huang and Johannes Hubmayr and Kevin M. Huffenberger and John P. Hughes and Leopoldo Infante and Kent Irwin and Simon Muya Kasanda and Jeff Klein and Brian Koopman and Arthur Kosowsky and Dale Li and Mathew Madhavacheril and Tobias A. Marriage and Jeff McMahon and Felipe Menanteau and Kavilan Moodley and Charles Munson and Sigurd Naess and Federico Nati and Laura Newburgh and John Nibarger and Michael D. Niemack and Michael R. Nolta and Carolina Nuñez and Lyman A. Page and Christine Pappas and Bruce Partridge and Felipe Rojas and Emmanuel Schaan and Benjamin L. Schmitt and Neelima Sehgal and Blake D. Sherwin and Jon Sievers and Sara Simon and David N. Spergel and Suzanne T. Staggs and Eric R. Switzer and Robert Thornton and Hy Trac and Jesse Treu and Carole Tucker and Alexander Van Engelen and Jonathan T. Ward and Edward J. Wollack},
journal= {arXiv preprint arXiv:1610.02360},
year = {2017}
}
Comments
23 pages, 25 figures