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A Comparison of Maps and Power Spectra Determined from South Pole Telescope and Planck Data

Hou, Z. and Crites, A. T. (2018) A Comparison of Maps and Power Spectra Determined from South Pole Telescope and Planck Data. Astrophysical Journal, 853 (1). Art. No. 3. ISSN 1538-4357. https://resolver.caltech.edu/CaltechAUTHORS:20180119-155940651

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Abstract

We study the consistency of 150 GHz data from the South Pole Telescope (SPT) and 143 GHz data from the Planck satellite over the patch of sky covered by the SPT-SZ survey. We first visually compare the maps and find that the residuals appear consistent with noise after accounting for differences in angular resolution and filtering. We then calculate (1) the cross-spectrum between two independent halves of SPT data, (2) the cross-spectrum between two independent halves of Planck data, and (3) the cross-spectrum between SPT and Planck data. We find that the three cross-spectra are well fit (PTE = 0.30) by the null hypothesis in which both experiments have measured the same sky map up to a single free calibration parameter—i.e., we find no evidence for systematic errors in either data set. As a by-product, we improve the precision of the SPT calibration by nearly an order of magnitude, from 2.6% to 0.3% in power. Finally, we compare all three cross-spectra to the full-sky Planck power spectrum and find marginal evidence for differences between the power spectra from the SPT-SZ footprint and the full sky. We model these differences as a power law in spherical harmonic multipole number. The best-fit value of this tilt is consistent among the three cross-spectra in the SPT-SZ footprint, implying that the source of this tilt is a sample variance fluctuation in the SPT-SZ region relative to the full sky. The consistency of cosmological parameters derived from these data sets is discussed in a companion paper.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/1538-4357/aaa3efDOIArticle
http://iopscience.iop.org/article/10.3847/1538-4357/aaa3ef/metaPublisherArticle
https://arxiv.org/abs/1704.00884arXivDiscussion Paper
Additional Information:© 2018 The American Astronomical Society. Received 2017 April 4; revised 2017 December 1; accepted 2017 December 19; published 2018 January 17. The South Pole Telescope is supported by the National Science Foundation through grant PLR-1248097. Partial support is also provided by the NSF Physics Frontier Center grant PHY-1125897 to the Kavli Institute of Cosmological Physics at the University of Chicago, the Kavli Foundation, and the Gordon and Betty Moore Foundation grant GBMF 947. The McGill group acknowledges funding from the National Sciences and Engineering Research Council of Canada, the Canada Research Chairs program, and the Canadian Institute for Advanced Research. Argonne National Laboratory work was supported under U.S. Department of Energy contract DE-AC02-06CH11357. B.B. is supported by the Fermi Research Alliance, LLC under contract No. De-AC02-07CH11359 with the U.S. Department of Energy. C.R. acknowledges support from an Australian Research Councils Future Fellowship (FT150100074). We thank D. Rapetti for comments on the manuscript, and we thank an anonymous referee for helpful suggestions.
Funders:
Funding AgencyGrant Number
NSFPLR-1248097
NSFPHY-1125897
Kavli FoundationUNSPECIFIED
Gordon and Betty Moore FoundationGBMF 947
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Canada Research Chairs ProgramUNSPECIFIED
Canadian Institute for Advanced Research (CIFAR)UNSPECIFIED
Department of Energy (DOE)DE-AC02-06CH11357
Department of Energy (DOE)DE-AC02-07CH11359
Australian Research CouncilFT150100074
Subject Keywords:cosmic background radiation – methods: data analysis
Issue or Number:1
Record Number:CaltechAUTHORS:20180119-155940651
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180119-155940651
Official Citation:Z. Hou et al 2018 ApJ 853 3
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84434
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:20 Jan 2018 00:22
Last Modified:03 Oct 2019 19:18

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