A Measurement of Gravitational Lensing of the Microwave Background Using South Pole Telescope Data
We use South Pole Telescope data from 2008 and 2009 to detect the non-Gaussian signature in the cosmic microwave background (CMB) produced by gravitational lensing and to measure the power spectrum of the projected gravitational potential. We constrain the ratio of the measured amplitude of the lens...
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ftcaltechauth:oai:authors.library.caltech.edu:b3f51-30t42 2024-09-15T18:36:45+00:00 A Measurement of Gravitational Lensing of the Microwave Background Using South Pole Telescope Data van Engelen, A. Lueker, M. Padin, S. Vieira, J. D. 2012-09-10 https://doi.org/10.1088/0004-637X/756/2/142 unknown American Astronomical Society https://doi.org/10.1088/0004-637X/756/2/142 oai:authors.library.caltech.edu:b3f51-30t42 eprintid:35299 resolverid:CaltechAUTHORS:20121106-101227703 info:eu-repo/semantics/openAccess Other Astrophysical Journal, 756(2), Art. No. 142, (2012-09-10) cosmic background radiation cosmological parameters cosmology: observations gravitational lensing: weak large-scale structure of universe info:eu-repo/semantics/article 2012 ftcaltechauth https://doi.org/10.1088/0004-637X/756/2/142 2024-08-06T15:35:05Z We use South Pole Telescope data from 2008 and 2009 to detect the non-Gaussian signature in the cosmic microwave background (CMB) produced by gravitational lensing and to measure the power spectrum of the projected gravitational potential. We constrain the ratio of the measured amplitude of the lensing signal to that expected in a fiducial ΛCDM cosmological model to be 0.86 ± 0.16, with no lensing disfavored at 6.3σ. Marginalizing over ΛCDM cosmological models allowed by the Wilkinson Microwave Anisotropy Probe (WMAP7) results in a measurement of A_lens = 0.90 ± 0.19, indicating that the amplitude of matter fluctuations over the redshift range 0.5 ≲ z ≲ 5 probed by CMB lensing is in good agreement with predictions. We present the results of several consistency checks. These include a clear detection of the lensing signature in CMB maps filtered to have no overlap in Fourier space, as well as a "curl" diagnostic that is consistent with the signal expected for ΛCDM. We perform a detailed study of bias in the measurement due to noise, foregrounds, and other effects and determine that these contributions are relatively small compared to the statistical uncertainty in the measurement. We combine this lensing measurement with results from WMAP7 to improve constraints on cosmological parameters when compared to those from WMAP7 alone: we find a factor of 3.9 improvement in the measurement of the spatial curvature of the universe, Ω_k = –0.0014 ± 0.0172; a 10% improvement in the amplitude of matter fluctuations within ΛCDM, σ_8 = 0.810 ± 0.026; and a 5% improvement in the dark energy equation of state, w = –1.04 ± 0.40. When compared with the measurement of w provided by the combination of WMAP7 and external constraints on the Hubble parameter, the addition of the lensing data improves the measurement of w by 15% to give w = –1.087 ± 0.096. © 2012 American Astronomical Society. Received 2012 February 3; accepted 2012 June 25; published 2012 August 23. We thank E. Anderes, S. Das, S. Dodelson, ... Article in Journal/Newspaper South pole Caltech Authors (California Institute of Technology) The Astrophysical Journal 756 2 142 |
institution |
Open Polar |
collection |
Caltech Authors (California Institute of Technology) |
op_collection_id |
ftcaltechauth |
language |
unknown |
topic |
cosmic background radiation cosmological parameters cosmology: observations gravitational lensing: weak large-scale structure of universe |
spellingShingle |
cosmic background radiation cosmological parameters cosmology: observations gravitational lensing: weak large-scale structure of universe van Engelen, A. Lueker, M. Padin, S. Vieira, J. D. A Measurement of Gravitational Lensing of the Microwave Background Using South Pole Telescope Data |
topic_facet |
cosmic background radiation cosmological parameters cosmology: observations gravitational lensing: weak large-scale structure of universe |
description |
We use South Pole Telescope data from 2008 and 2009 to detect the non-Gaussian signature in the cosmic microwave background (CMB) produced by gravitational lensing and to measure the power spectrum of the projected gravitational potential. We constrain the ratio of the measured amplitude of the lensing signal to that expected in a fiducial ΛCDM cosmological model to be 0.86 ± 0.16, with no lensing disfavored at 6.3σ. Marginalizing over ΛCDM cosmological models allowed by the Wilkinson Microwave Anisotropy Probe (WMAP7) results in a measurement of A_lens = 0.90 ± 0.19, indicating that the amplitude of matter fluctuations over the redshift range 0.5 ≲ z ≲ 5 probed by CMB lensing is in good agreement with predictions. We present the results of several consistency checks. These include a clear detection of the lensing signature in CMB maps filtered to have no overlap in Fourier space, as well as a "curl" diagnostic that is consistent with the signal expected for ΛCDM. We perform a detailed study of bias in the measurement due to noise, foregrounds, and other effects and determine that these contributions are relatively small compared to the statistical uncertainty in the measurement. We combine this lensing measurement with results from WMAP7 to improve constraints on cosmological parameters when compared to those from WMAP7 alone: we find a factor of 3.9 improvement in the measurement of the spatial curvature of the universe, Ω_k = –0.0014 ± 0.0172; a 10% improvement in the amplitude of matter fluctuations within ΛCDM, σ_8 = 0.810 ± 0.026; and a 5% improvement in the dark energy equation of state, w = –1.04 ± 0.40. When compared with the measurement of w provided by the combination of WMAP7 and external constraints on the Hubble parameter, the addition of the lensing data improves the measurement of w by 15% to give w = –1.087 ± 0.096. © 2012 American Astronomical Society. Received 2012 February 3; accepted 2012 June 25; published 2012 August 23. We thank E. Anderes, S. Das, S. Dodelson, ... |
format |
Article in Journal/Newspaper |
author |
van Engelen, A. Lueker, M. Padin, S. Vieira, J. D. |
author_facet |
van Engelen, A. Lueker, M. Padin, S. Vieira, J. D. |
author_sort |
van Engelen, A. |
title |
A Measurement of Gravitational Lensing of the Microwave Background Using South Pole Telescope Data |
title_short |
A Measurement of Gravitational Lensing of the Microwave Background Using South Pole Telescope Data |
title_full |
A Measurement of Gravitational Lensing of the Microwave Background Using South Pole Telescope Data |
title_fullStr |
A Measurement of Gravitational Lensing of the Microwave Background Using South Pole Telescope Data |
title_full_unstemmed |
A Measurement of Gravitational Lensing of the Microwave Background Using South Pole Telescope Data |
title_sort |
measurement of gravitational lensing of the microwave background using south pole telescope data |
publisher |
American Astronomical Society |
publishDate |
2012 |
url |
https://doi.org/10.1088/0004-637X/756/2/142 |
genre |
South pole |
genre_facet |
South pole |
op_source |
Astrophysical Journal, 756(2), Art. No. 142, (2012-09-10) |
op_relation |
https://doi.org/10.1088/0004-637X/756/2/142 oai:authors.library.caltech.edu:b3f51-30t42 eprintid:35299 resolverid:CaltechAUTHORS:20121106-101227703 |
op_rights |
info:eu-repo/semantics/openAccess Other |
op_doi |
https://doi.org/10.1088/0004-637X/756/2/142 |
container_title |
The Astrophysical Journal |
container_volume |
756 |
container_issue |
2 |
container_start_page |
142 |
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1810480462574911488 |