Consistency of cosmic microwave background temperature measurements in three frequency bands in the 2500-square-degree SPT-SZ survey
de Haan, T.
AffiliationUniv Arizona, Steward Observ
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PublisherIOP PUBLISHING LTD
CitationL.M. Mocanu et al JCAP07(2019)038
Rights© 2019 IOP Publishing Ltd and Sissa Medialab.
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AbstractWe 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 similar to 2500 deg(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 chi(2) value of 236.3 for 235 degrees of freedom, and the probability to exceed this chi(2) value is 46%.
Note12 month embargo; published online: 24 July 2019
VersionFinal accepted manuscript
SponsorsNational Science Foundation [PLR-1248097]; NSF Physics Frontier Center [PHY-0114422]; Kavli Foundation; Gordon and Betty Moore Foundation ; Office of Science of the U.S. Department of Energy [DE-AC02-05CH11231]; Open Science Grid, NSF [NSF PHY 1148698]; Australian Research Council's Future Fellowship [FT150100074]; NASA Office of Space Science