THE ATACAl\fA COSMOLOGY TELESCOPE: A MEASUREMENT OF THE COSMIC MICROWAVE BACKGROUND POWER SPECTRUM AT 148 AND 218 GHZ FROM THE 2008 SOUTHERN SURVEY

\Ve present measurements of the cosmic microwave background (CMB) power spectrum made by the Atacama Cosmology Telescope at 148 GHz and 218 GHz, as well as the cross-frequency spectrum between the two channels. Our results dearly show the second through the seventh acoustic peaks in the CMB power spectrum. The measurements of these higher-order peaks provide an additional test of the ACDM cosmological model. At f. > 3000, we detect power in excess of the primary anisotropy spectrum of the CMB. At lower rnultipoles 500 < ji < 3000, we find evidence for gravitational lensing of the CMB in the power spectrum at the 2.8Cl level. \Ve also detect a low level of Galactic dust in our maps, which demonstrates tlmt we can recover known faint, diffuse signals. Sub,iect headings: cosmology: cosmic microwave background, cosmology: observations 1 Berkeley Center for Cosmological Physics, LBL and Department of Physics, University of California, Berkeley, CA, USA 94720 2 Joseph Henry Laboratories of Physics, Jadwin Hall, Princeton University, Princeton, NJ, CSA 08544 3 Department of Astrophysical Sciences, Peyton Hall, Princeton University, Princeton, NJ USA 08544 4 Current address: Dept. of Physics and Astronomy, The Johns Hopkins University, 3400 N. Charles St., Baltimore, MD 21218-2686 5 School of Physics and Astronomy, Cardiff University, The Parade, Cardiff, Wales, UK CF24 3AA 6 Departamento de Astronomfa y Astroffsica, Facultad de Ffsica, Pontificia Universidad Catolica, Casilla 306, Santiago 22, Chile 7 Department of Physics and Astronomy, University of British Columbia. Vancouver. BC. Canada V6T 1Z4 8 Depa~tment of Physics, University of Rome "La Sapienza", Piazzale Aldo Moro 5, 1-00185 Rome, Italy 9 Canadian Institute for Theoretical Astrophysics, University of Toronto, Toronto, ON, Canada 1\,15S 3H8 10 Department of Physics and Astronomy, Cniversity of Pittsburfh, Pittsburgh, PA, USA 15260 1 Code 553/665, NASA/Goddard Space Flight Center, Greenbelt, J\! D, USA 20771 12 Department of Physics and Astronomy, University of Pennsylvania, 209 South 33rd Street, Philadelphia, PA, USA 19104 13 ;'-JIST Quantum Devices Group, 325 Broadway l\lailcode 817.03, Boulder, CO. CSA 80305 14 Department of' Astrophysics, Oxford University, Oxford, UK OX1 3RH 15 Max Planck Institut fiir Astrophysik. Postfach 1317, DGarching bei l\! iinchen, Germany Astrophysics and Cosmology Research Unit. School of Mathematical Sciences, Cniversity of KwaZulu-Natal, Durban, South Africa for High Performance Computing, CSIR Campus, 15 Lower Hope St., Rosebank, Cape Town. South Africa 18 Department of Physics, University of Miami, Coral Gables, FL. USA 33124 19 Instituto Nacional de Astroffsica, Optica y Electronica (INAOE), Tonantzintla, Puebla, Mexico 20 Department of Physics and Astronomy. Rutgers, The State University of New Jersey, Piscataway. NJ USA 08854-8019 21 Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, Stanford, CA, USA 94305-4085 22 Department of Physics, Stanford University, Stanford, CA, USA 94305-4085 23 Columbia Astrophysics Laboratory, 550 W. 120th St. Mail Code 5247. New York. NY USA 10027 24 Instit{,te for the Physics and Mathematics of the universe, University of Tokyo, Kashiwa, Chiba 277-8568, Japan Kavli Institute for Cosmological Physics, 5620 South Ellis Ave., Chicago, IL, USA 60637 26 Department of Physics, Cniversity of Toronto. 60 St. George Street, Toronto. ON, Canada 1\15S 1A7 27 Department of Physics and Astronomy, Haverford College, Haverford. PA, USA 19041 28 Institut de Ciencies del Cosmos (ICC), C niversity of Barcelona. Barcelona 08028 . Spain 29 Department of Physics , Vvest Chester university of PennWest Chester, PA. USA 19383 Department of Physics, Carnegie J\! ellon University, Pittsburgh. PA 15213 :)f Harvard-Smithsonian Center for Astrophysics, Harvard University, Cambridge, MA, USA 02138 https://ntrs.nasa. gov/search.jsp? R=20120002591 2020-03-09T13:59:54+00:00Z