Article

The Atacama Cosmology Telescope: DR4 maps and cosmological parameters

Austermann, JEJoseph Henry Laboratories of Physics, Jadwin Hall, Princeton University, Princeton, NJ 08544, U.S.AAbitbol, MHSchool of Physics and Astronomy, Cardiff University, The Parade, Cardiff, Wales, CF24 3AA, U.KCalabrese, EUniversité Paris-Saclay, CNRS, Institut d'astrophysique spatiale, 91405, Orsay, FranceAddison, GECenter for Computational Astrophysics, Flatiron Institute, 162 5th Avenue, New York, NY 10010, U.S.AMaurin, LDepartment of Physics and Astronomy, University of Pennsylvania, 209 South 33rd Street, Philadelphia, PA 19104, U.S.ANaess, SDepartment of Physics, University of Oxford, Keble Road, Oxford, U.K. OX1 3RHBecker, DTDept. of Physics and Astronomy, The Johns Hopkins University, 3400 N. Charles St., Baltimore, MD 21218-2686, U.S.ABattaglia, NSchool of Physics and Astronomy, Cardiff University, The Parade, Cardiff, Wales, CF24 3AA, U.KAmodeo, SDepartment of Physics, University of Oxford, Keble Road, Oxford, U.K. OX1 3RHAde, PARDepartment of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z4, CanadaAmiri, MDepartment of Astronomy, Cornell University, Ithaca, NY 14853, U.S.ACampusano, LEDepartment of Physics and Astronomy, University of Pennsylvania, 209 South 33rd Street, Philadelphia, PA 19104, U.S.ABond, JRNIST Quantum Devices Group, 325 Broadway Mailcode 817.03, Boulder, CO 80305, U.S.ATaylor BaildonDepartment of Physics, University of Michigan, Ann Arbor 48103, U.S.ABeall, JADepartment of Astronomy, Cornell University, Ithaca, NY 14853, U.S.AAngile, ENIST Quantum Devices Group, 325 Broadway Mailcode 817.03, Boulder, CO 80305, U.S.ACothard, NFDepartment of Astronomy, Cornell University, Ithaca, NY 14853, U.S.AChesmore, GENIST Quantum Devices Group, 325 Broadway Mailcode 817.03, Boulder, CO 80305, U.S.ABruno, SMCanadian Institute for Theoretical Astrophysics, University of Toronto, Toronto, ON M5S 3H8, CanadaBean, RJoseph Henry Laboratories of Physics, Jadwin Hall, Princeton University, Princeton, NJ 08544, U.S.ACrowley, KTDepartment of Astronomy, Cornell University, Ithaca, NY 14853, U.S.ACalafut, VUniversidad de Chile, Dept Astronomía Casilla 36-D, Santiago, ChileCho, H-MClark, SEDepartment of Physics, University of Chicago, Chicago, IL 60637, U.S.ACarrero, FSLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park, California 94025, U.S.ADuivenvoorden, AJDepartment of Physics, Cornell University, Ithaca, NY 14853, U.S.ADenison, EVInstitute for Advanced Study, 1 Einstein Dr, Princeton, NJ 08540, U.S.ACrichton, DDepartment of Applied and Engineering Physics, Cornell University, Ithaca, NY 14853, U.S.AChoi, SKAstrophysics Research Centre, School of Mathematics, Statistics and Computer Science, University of KwaZulu-Natal, Durban 4001, South AfricaEssinger-Hileman, TJoseph Henry Laboratories of Physics, Jadwin Hall, Princeton University, Princeton, NJ 08544, U.S.ADevlin, MJDAMTP, Centre for Mathematical Sciences, University of Cambridge, Wilberforce Road, Cambridge CB3 OWA, U.KDuff, SMDept. of Physics and Astronomy, The Johns Hopkins University, 3400 N. Charles St., Baltimore, MD 21218-2686, U.S.ADarwish, ONIST Quantum Devices Group, 325 Broadway Mailcode 817.03, Boulder, CO 80305, U.S.ADatta, RDepartment of Physics and Astronomy, University of Pennsylvania, 209 South 33rd Street, Philadelphia, PA 19104, U.S.AGallardo, PADepartment of Physics, Cornell University, Ithaca, NY 14853, U.S.ADünner, RNIST Quantum Devices Group, 325 Broadway Mailcode 817.03, Boulder, CO 80305, U.S.AGluscevic, VJoseph Henry Laboratories of Physics, Jadwin Hall, Princeton University, Princeton, NJ 08544, U.S.ADuell, CJDepartment of Astrophysical Sciences, Peyton Hall, Princeton University, Princeton, NJ U.S.A. 08544Golec, JEInstituto de Astrofísica and Centro de Astro-Ingeniería, Facultad de Fìsica, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 7820436 Macul, Santiago, ChileFankhanel, MNASA/Goddard Space Flight Center, Greenbelt, MD 20771, U.S.AFerraro, SFuzia, BBerkeley Center for Cosmological Physics, LBL and Department of Physics, University of California, Berkeley, CA 94720, U.S.ADunkley, JNIST Quantum Devices Group, 325 Broadway Mailcode 817.03, Boulder, CO 80305, U.S.AAlonso, DDepartment of Physics, Florida State University, Tallahassee FL 32306, U.S.AGralla, MDepartment of Physics, Cornell University, Ithaca, NY 14853, U.S.AFox, AEUniversity of Southern California. Department of Physics and Astronomy, 825 Bloom Walk ACB 439, Los Angeles, CA 90089-0484, U.S.AGrace, EDepartment of Physics, University of Chicago, Chicago, IL 60637, U.S.ASchmitt, BLJoseph Henry Laboratories of Physics, Jadwin Hall, Princeton University, Princeton, NJ 08544, U.S.AAiola, SDepartment of Astronomy/Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721-0065, U.S.AYilun GuanDepartment of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, U.S.A

2020en

ABI

Abstract

We present new arcminute-resolution maps of the Cosmic Microwave Background temperature and polarization anisotropy from the Atacama Cosmology Telescope, using data taken from 2013&ndash;2016 at 98 and 150 GHz. The maps cover more than 17,000 deg2, the deepest 600 deg2&nbsp;with noise levels below&nbsp;10&mu;K-arcmin. We use the power spectrum derived from almost 6,000 deg2&nbsp;of these maps to constrain cosmology. The ACT data enable a measurement of the angular scale of features in both the divergence-like polarization and the temperature anisotropy, tracing both the velocity and density at last-scattering. From these one can derive the distance to the last-scattering surface and thus infer the local expansion rate,&nbsp;H0. By combining ACT data with large-scale information from&nbsp;WMAP&nbsp;we measure&nbsp;H0=67.6&plusmn;&nbsp;1.1&nbsp;km/s/Mpc, at 68% confidence, in excellent agreement with the independently-measured&nbsp;Planck&nbsp;satellite estimate (from ACT alone we find&nbsp;H0=67.9&plusmn;&nbsp;1.5&nbsp;km/s/Mpc). The&nbsp;&Lambda;CDM model provides a good fit to the ACT data, and we find no evidence for deviations: both the spatial curvature, and the departure from the standard lensing signal in the spectrum, are zero to within 1&sigma;; the number of relativistic species, the primordial Helium fraction, and the running of the spectral index are consistent with&nbsp;&Lambda;CDM predictions to within 1.5&ndash;2.2&sigma;. We compare ACT,&nbsp;WMAP, and&nbsp;Planck&nbsp;at the parameter level and find good consistency; we investigate how the constraints on the correlated spectral index and baryon density parameters readjust when adding CMB large-scale information that ACT does not measure. The DR4 products presented here will be publicly released on the NASA Legacy Archive for Microwave Background Data Analysis.

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