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Consistency of cosmic microwave background temperature measurements in three frequency bands in the 2500-square-degree SPT-SZ survey

Mocanu, L. M. and Crites, A. T. (2019) Consistency of cosmic microwave background temperature measurements in three frequency bands in the 2500-square-degree SPT-SZ survey. Journal of Cosmology and Astroparticle Physics, 2019 (7). Art. No. 038. ISSN 1475-7516. doi:10.1088/1475-7516/2019/07/038.

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We present an internal consistency test of South Pole Telescope (SPT) measurements of the cosmic microwave background (CMB) temperature anisotropy using three-band data from the SPT-SZ survey. These measurements are made from observations of ~ 2500 °2 of sky in three frequency bands centered at 95, 150, and 220 GHz. We combine the information from these three bands into six semi-independent estimates of the CMB power spectrum (three single-frequency power spectra and three cross-frequency spectra) over the multipole range 650<ℓ<3000. We subtract an estimate of foreground power from each power spectrum and evaluate the consistency among the resulting CMB-only spectra. We determine that the six foreground-cleaned power spectra are consistent with the null hypothesis, in which the six cleaned spectra contain only CMB power and noise. A fit of the data to this model results in a χ^2 value of 236.3 for 235 degrees of freedom, and the probability to exceed this χ^2 value is 46%.

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Additional Information:© 2019 IOP Publishing Ltd and Sissa Medialab. Received 1 May 2019; Accepted 7 July 2019; Published 24 July 2019. The South Pole Telescope program is supported by the National Science Foundation through grant PLR-1248097. Partial support is also provided by the NSF Physics Frontier Center grant PHY-0114422 to the Kavli Institute of Cosmological Physics at the University of Chicago, the Kavli Foundation, and the Gordon and Betty Moore Foundation through grant GBMF#947 to the University of Chicago. This research used resources of the National Energy Research Scientific Computing Center, which is supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231, and the resources of the University of Chicago Computing Cooperative (UC3), supported in part by the Open Science Grid, NSF grant NSF PHY 1148698. CR acknowledges support from an Australian Research Council’s Future Fellowship (FT150100074). Some of the results in this paper have been derived using the HEALPix [17] package. We acknowledge the use of the Legacy Archive for Microwave Background Data Analysis (LAMBDA). Support for LAMBDA is provided by the NASA Office of Space Science.
Funding AgencyGrant Number
Kavli FoundationUNSPECIFIED
Gordon and Betty Moore Foundation947
Department of Energy (DOE)DE-AC02-05CH11231
Australian Research CouncilFT150100074
Issue or Number:7
Record Number:CaltechAUTHORS:20190724-110432838
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Official Citation:L.M. Mocanu et al JCAP07(2019)038
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97387
Deposited By: Tony Diaz
Deposited On:24 Jul 2019 22:00
Last Modified:16 Nov 2021 17:31

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