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

Z. Hou, K. Aylor, B. A. Benson, L. E. Bleem, J. E. Carlstrom, C. L. Chang, H. M. Cho, R. Chown, T. M. Crawford, A. T. Crites, T. De Haan, M. A. Dobbs, W. B. Everett, B. Follin, E. M. George, N. W. Halverson, N. L. Harrington, G. P. Holder, W. L. Holzapfel, J. D. HrubesR. Keisler, L. Knox, A. T. Lee, E. M. Leitch, D. Luong-Van, D. P. Marrone, J. J. McMahon, S. S. Meyer, M. Millea, L. M. Mocanu, J. J. Mohr, T. Natoli, Y. Omori, S. Padin, C. Pryke, C. L. Reichardt, J. E. Ruhl, J. T. Sayre, K. K. Schaffer, E. Shirokoff, Z. Staniszewski, A. A. Stark, K. T. Story, K. Vanderlinde, J. D. Vieira, R. Williamson

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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.

Original languageEnglish (US)
Article number3
JournalAstrophysical Journal
Volume853
Issue number1
DOIs
StatePublished - Jan 20 2018

Bibliographical note

Funding Information:
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.

Publisher Copyright:
© 2018. The American Astronomical Society. All rights reserved..

Keywords

  • cosmic background radiation
  • methods: data analysis

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