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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Second season QUIET observations: Measurements of the cosmic microwave background polarization power spectrum at 95 GHz
Astrophysical Journal, Volume 760, No. 2, Article 145, Year 2012
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Description
The Q/U Imaging ExperimenT (QUIET) has observed the cosmic microwave background (CMB) at 43 and 95 GHz. The 43 GHz results have been published in a previous paper, and here we report the measurement of CMB polarization power spectra using the 95 GHz data. This data set comprises 5337 hr of observations recorded by an array of 84 polarized coherent receivers with a total array sensitivity of 87 μK. Four low-foreground fields were observed, covering a total of 1000 deg2 with an effective angular resolution of 128, allowing for constraints on primordial gravitational waves and high signal-to-noise measurements of the E-modes across three acoustic peaks. The data reduction was performed using two independent analysis pipelines, one based on a pseudo-C ℓ (PCL) cross-correlation approach, and the other on a maximum-likelihood (ML) approach. All data selection criteria and filters were modified until a predefined set of null tests had been satisfied before inspecting any non-null power spectrum. The results derived by the two pipelines are in good agreement. We characterize the EE, EB, and BB power spectra between ℓ = 25 and 975 and find that the EE spectrum is consistent with ΛCDM, while the BB power spectrum is consistent with zero. Based on these measurements, we constrain the tensor-to-scalar ratio to r = 1.1+0.9-0.8 (r < 2.8 at 95% C.L.) as derived by the ML pipeline, and r = 1.2+0.9- 0.8 (r < 2.7 at 95% C.L.) as derived by the PCL pipeline. In one of the fields, we find a correlation with the dust component of the Planck Sky Model, though the corresponding excess power is small compared to statistical errors. Finally, we derive limits on all known systematic errors, and demonstrate that these correspond to a tensor-to-scalar ratio smaller than r = 0.01, the lowest level yet reported in the literature. © 2012. The American Astronomical Society. All rights reserved..
Authors & Co-Authors
Araujo, D.
United States, New York
Columbia University
Bischoff, Colin A.
United States, Chicago
The Enrico Fermi Institute
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Brizius, A.
United States, Chicago
The Enrico Fermi Institute
Germany, Bonn
Max Planck Institute for Radio Astronomy
Buder, Immanuel
United States, Chicago
The Enrico Fermi Institute
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Chinone, Yuji
Japan, Tsukuba
High Energy Accelerator Research Organization, Tsukuba
Japan, Sendai
Tohoku University
Cleary, K.
United States, Pasadena
California Institute of Technology
Dumoulin, R. N.
United States, New York
Columbia University
Kusaka, Akito
United States, Chicago
The Enrico Fermi Institute
United States, Princeton
Princeton University
Monsalve, Raul A.
United States, Coral Gables
University of Miami
United States, Tempe
School of Earth and Space Exploration
Naess, Sigurd K.
Norway, Oslo
Universitetet I Oslo
Newburgh, Laura B.
United States, New York
Columbia University
United States, Princeton
Princeton University
Reeves, Rodrigo A.
United States, Pasadena
California Institute of Technology
Wehus, Ingunn Kathrine
United Kingdom, Oxford
University of Oxford
Norway, Oslo
Universitetet I Oslo
Zwart, Jonathan T.L.
United States, New York
Columbia University
South Africa, Bellville
University of the Western Cape
Bronfman, Leonardo
Chile, Santiago
Universidad de Chile
Bustos, R.
United States, Coral Gables
University of Miami
Chile, Santiago
Universidad de Chile
Chile, Biobio
Universidad de Concepcion
Church, Sarah E.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Dickinson, Clive
United Kingdom, Manchester
The University of Manchester
Eriksen, Hans Kristian K.
Norway, Oslo
Universitetet I Oslo
Gaier, Todd C.
United States, Pasadena
Jet Propulsion Laboratory
Gundersen, J. O.
United States, Coral Gables
University of Miami
Hasegawa, Masaya
Japan, Tsukuba
High Energy Accelerator Research Organization, Tsukuba
Hazumi, Masashi
Japan, Tsukuba
High Energy Accelerator Research Organization, Tsukuba
Huffenberger, Kevin M.
United States, Coral Gables
University of Miami
Ishidoshiro, K.
Japan, Tsukuba
High Energy Accelerator Research Organization, Tsukuba
Jones, Michael E.
United Kingdom, Oxford
University of Oxford
Kangaslahti, Pekka P.
United States, Pasadena
Jet Propulsion Laboratory
Kapner, D. J.
United States, Chicago
The Enrico Fermi Institute
United States, Kirkland
Micro Encoder Inc.
Kubik, D.
United States, Batavia
Fermi National Accelerator Laboratory
Lawrence, Charles R.
United States, Pasadena
Jet Propulsion Laboratory
Limon, Michele
United States, New York
Columbia University
McMahon, Jeffrey John
United States, Ann Arbor
University of Michigan, Ann Arbor
Miller, Amber D.
United States, New York
Columbia University
Nagai, M.
Japan, Tsukuba
High Energy Accelerator Research Organization, Tsukuba
Nguyên, Hien Trong
United States, Batavia
Fermi National Accelerator Laboratory
Nixon, G.
United States, Princeton
Princeton University
United States, Red Bank
Tradeworx, Inc.
Pearson, Timothy J.
United States, Pasadena
California Institute of Technology
Piccirillo, Lucio
United Kingdom, Manchester
The University of Manchester
Radford, Simon J.E.
United States, Pasadena
California Institute of Technology
Readhead, Anthony C.S.
United States, Pasadena
California Institute of Technology
Richards, Joseph L.
United States, Pasadena
California Institute of Technology
Samtleben, Dorothea Franziska Elisabeth
Germany, Bonn
Max Planck Institute for Radio Astronomy
Netherlands, Amsterdam
Fom-institute of Subatomic Physics - Nikhef
Seiffert, Michael D.
United States, Pasadena
Jet Propulsion Laboratory
Shepherd, M. C.
United States, Pasadena
California Institute of Technology
Smith, Kendrick M.
United States, Chicago
The Enrico Fermi Institute
United States, Princeton
Princeton University
Staggs, Suzanne T.
United States, Princeton
Princeton University
Tajima, Osamu
United States, Chicago
The Enrico Fermi Institute
Japan, Tsukuba
High Energy Accelerator Research Organization, Tsukuba
Thompson, K. L.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Vanderlinde, K.
United States, Chicago
The Enrico Fermi Institute
Canada, Montreal
Université Mcgill
Williamson, R.
United States, New York
Columbia University
United States, Chicago
The Enrico Fermi Institute
Statistics
Citations: 86
Authors: 50
Affiliations: 24
Identifiers
Doi:
10.1088/0004-637X/760/2/145
ISSN:
0004637X
e-ISSN:
15384357
Study Approach
Quantitative