A Comparison of Maps and Power Spectra Determined from South Pole Telescope and Planck Data
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...
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American Astronomical Society
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ftcaltechauth:oai:authors.library.caltech.edu:84434 2023-05-15T18:22:11+02:00 A Comparison of Maps and Power Spectra Determined from South Pole Telescope and Planck Data Hou, Z. Crites, A. T. 2018-01-20 application/pdf https://authors.library.caltech.edu/84434/ https://authors.library.caltech.edu/84434/1/Hou_2018_ApJ_853_3.pdf https://authors.library.caltech.edu/84434/2/1704.00884.pdf https://resolver.caltech.edu/CaltechAUTHORS:20180119-155940651 en eng American Astronomical Society https://authors.library.caltech.edu/84434/1/Hou_2018_ApJ_853_3.pdf https://authors.library.caltech.edu/84434/2/1704.00884.pdf 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. doi:10.3847/1538-4357/aaa3ef. https://resolver.caltech.edu/CaltechAUTHORS:20180119-155940651 <https://resolver.caltech.edu/CaltechAUTHORS:20180119-155940651> other Article PeerReviewed 2018 ftcaltechauth https://doi.org/10.3847/1538-4357/aaa3ef 2021-11-18T18:44:50Z 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. Article in Journal/Newspaper South pole Caltech Authors (California Institute of Technology) South Pole The Astrophysical Journal 853 1 3 |
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Caltech Authors (California Institute of Technology) |
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English |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Hou, Z. Crites, A. T. |
spellingShingle |
Hou, Z. Crites, A. T. A Comparison of Maps and Power Spectra Determined from South Pole Telescope and Planck Data |
author_facet |
Hou, Z. Crites, A. T. |
author_sort |
Hou, Z. |
title |
A Comparison of Maps and Power Spectra Determined from South Pole Telescope and Planck Data |
title_short |
A Comparison of Maps and Power Spectra Determined from South Pole Telescope and Planck Data |
title_full |
A Comparison of Maps and Power Spectra Determined from South Pole Telescope and Planck Data |
title_fullStr |
A Comparison of Maps and Power Spectra Determined from South Pole Telescope and Planck Data |
title_full_unstemmed |
A Comparison of Maps and Power Spectra Determined from South Pole Telescope and Planck Data |
title_sort |
comparison of maps and power spectra determined from south pole telescope and planck data |
publisher |
American Astronomical Society |
publishDate |
2018 |
url |
https://authors.library.caltech.edu/84434/ https://authors.library.caltech.edu/84434/1/Hou_2018_ApJ_853_3.pdf https://authors.library.caltech.edu/84434/2/1704.00884.pdf https://resolver.caltech.edu/CaltechAUTHORS:20180119-155940651 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
https://authors.library.caltech.edu/84434/1/Hou_2018_ApJ_853_3.pdf https://authors.library.caltech.edu/84434/2/1704.00884.pdf 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. doi:10.3847/1538-4357/aaa3ef. https://resolver.caltech.edu/CaltechAUTHORS:20180119-155940651 <https://resolver.caltech.edu/CaltechAUTHORS:20180119-155940651> |
op_rights |
other |
op_doi |
https://doi.org/10.3847/1538-4357/aaa3ef |
container_title |
The Astrophysical Journal |
container_volume |
853 |
container_issue |
1 |
container_start_page |
3 |
_version_ |
1766201551050768384 |