Cosmological Constraints from Sunyaev-Zel'dovich-selected Clusters with X-Ray Observations in the First 178 deg^2 of the South Pole Telescope Survey
We use measurements from the South Pole Telescope (SPT) Sunyaev-Zel'dovich (SZ) cluster survey in combination with X-ray measurements to constrain cosmological parameters. We present a statistical method that fits for the scaling relations of the SZ and X-ray cluster observables with mass while...
Published in: | The Astrophysical Journal |
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Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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American Astronomical Society
2013
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Online Access: | https://authors.library.caltech.edu/37093/ https://authors.library.caltech.edu/37093/1/0004-637X_763_2_147.pdf https://authors.library.caltech.edu/37093/7/1112.5435v1.pdf https://resolver.caltech.edu/CaltechAUTHORS:20130222-154859231 |
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Open Polar |
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Caltech Authors (California Institute of Technology) |
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English |
description |
We use measurements from the South Pole Telescope (SPT) Sunyaev-Zel'dovich (SZ) cluster survey in combination with X-ray measurements to constrain cosmological parameters. We present a statistical method that fits for the scaling relations of the SZ and X-ray cluster observables with mass while jointly fitting for cosmology. The method is generalizable to multiple cluster observables, and self-consistently accounts for the effects of the cluster selection and uncertainties in cluster mass calibration on the derived cosmological constraints. We apply this method to a data set consisting of an SZ-selected catalog of 18 galaxy clusters at z > 0.3 from the first 178 deg^2 of the 2500 deg^2 SPT-SZ survey, with 14 clusters having X-ray observations from either Chandra or XMM-Newton. Assuming a spatially flat ΛCDM cosmological model, we find the SPT cluster sample constrains σ_8(Ω_m /0.25)^(0.30) = 0.785 ± 0.037. In combination with measurements of the cosmic microwave background (CMB) power spectrum from the SPT and the seven-year Wilkinson Microwave Anisotropy Probe data, the SPT cluster sample constrains σ_8 = 0.795 ± 0.016 and Ω_m = 0.255 ± 0.016, a factor of 1.5 improvement on each parameter over the CMB data alone. We consider several extensions beyond the ΛCDM model by including the following as free parameters: the dark energy equation of state (w), the sum of the neutrino masses (Σm ν), the effective number of relativistic species (N_(eff)), and a primordial non-Gaussianity (f_(NL)). We find that adding the SPT cluster data significantly improves the constraints on w and Σm_ν beyond those found when using measurements of the CMB, supernovae, baryon acoustic oscillations, and the Hubble constant. Considering each extension independently, we best constrain w = –0.973 ± 0.063 and the sum of neutrino masses Σm_ν < 0.28 eV at 95% confidence, a factor of 1.25 and 1.4 improvement, respectively, over the constraints without clusters. Assuming a ΛCDM model with a free N_(eff) and Σm_ν, we measure N_(eff) = 3.91 ± 0.42 and constrain Σm_ν < 0.63 eV at 95% confidence. We also use the SPT cluster sample to constrain f_(NL) = –220 ± 317, consistent with zero primordial non-Gaussianity. Finally, we discuss the current systematic limitations due to the cluster mass calibration, and future improvements for the recently completed 2500 deg^2 SPT-SZ survey. The survey has detected ~500 clusters with a median redshift of ~0.5 and a median mass of ~2.3 × 10^(14) M_☉ h^(–1) and, when combined with an improved cluster mass calibration and existing external cosmological data sets will significantly improve constraints on w. |
format |
Article in Journal/Newspaper |
author |
Benson, B. A. Lueker, M. Padin, S. Shirokoff, E. Vieira, J. D. |
spellingShingle |
Benson, B. A. Lueker, M. Padin, S. Shirokoff, E. Vieira, J. D. Cosmological Constraints from Sunyaev-Zel'dovich-selected Clusters with X-Ray Observations in the First 178 deg^2 of the South Pole Telescope Survey |
author_facet |
Benson, B. A. Lueker, M. Padin, S. Shirokoff, E. Vieira, J. D. |
author_sort |
Benson, B. A. |
title |
Cosmological Constraints from Sunyaev-Zel'dovich-selected Clusters with X-Ray Observations in the First 178 deg^2 of the South Pole Telescope Survey |
title_short |
Cosmological Constraints from Sunyaev-Zel'dovich-selected Clusters with X-Ray Observations in the First 178 deg^2 of the South Pole Telescope Survey |
title_full |
Cosmological Constraints from Sunyaev-Zel'dovich-selected Clusters with X-Ray Observations in the First 178 deg^2 of the South Pole Telescope Survey |
title_fullStr |
Cosmological Constraints from Sunyaev-Zel'dovich-selected Clusters with X-Ray Observations in the First 178 deg^2 of the South Pole Telescope Survey |
title_full_unstemmed |
Cosmological Constraints from Sunyaev-Zel'dovich-selected Clusters with X-Ray Observations in the First 178 deg^2 of the South Pole Telescope Survey |
title_sort |
cosmological constraints from sunyaev-zel'dovich-selected clusters with x-ray observations in the first 178 deg^2 of the south pole telescope survey |
publisher |
American Astronomical Society |
publishDate |
2013 |
url |
https://authors.library.caltech.edu/37093/ https://authors.library.caltech.edu/37093/1/0004-637X_763_2_147.pdf https://authors.library.caltech.edu/37093/7/1112.5435v1.pdf https://resolver.caltech.edu/CaltechAUTHORS:20130222-154859231 |
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ENVELOPE(158.317,158.317,-80.867,-80.867) ENVELOPE(-66.200,-66.200,-66.817,-66.817) |
geographic |
Hubble South Pole Wilkinson |
geographic_facet |
Hubble South Pole Wilkinson |
genre |
South pole |
genre_facet |
South pole |
op_relation |
https://authors.library.caltech.edu/37093/1/0004-637X_763_2_147.pdf https://authors.library.caltech.edu/37093/7/1112.5435v1.pdf Benson, B. A. and Lueker, M. and Padin, S. and Shirokoff, E. and Vieira, J. D. (2013) Cosmological Constraints from Sunyaev-Zel'dovich-selected Clusters with X-Ray Observations in the First 178 deg^2 of the South Pole Telescope Survey. Astrophysical Journal, 763 (2). Art. No. 147. ISSN 0004-637X. doi:10.1088/0004-637X/763/2/147. https://resolver.caltech.edu/CaltechAUTHORS:20130222-154859231 <https://resolver.caltech.edu/CaltechAUTHORS:20130222-154859231> |
op_rights |
other |
op_doi |
https://doi.org/10.1088/0004-637X/763/2/147 |
container_title |
The Astrophysical Journal |
container_volume |
763 |
container_issue |
2 |
container_start_page |
147 |
_version_ |
1766202127571484672 |
spelling |
ftcaltechauth:oai:authors.library.caltech.edu:37093 2023-05-15T18:22:43+02:00 Cosmological Constraints from Sunyaev-Zel'dovich-selected Clusters with X-Ray Observations in the First 178 deg^2 of the South Pole Telescope Survey Benson, B. A. Lueker, M. Padin, S. Shirokoff, E. Vieira, J. D. 2013-02-01 application/pdf https://authors.library.caltech.edu/37093/ https://authors.library.caltech.edu/37093/1/0004-637X_763_2_147.pdf https://authors.library.caltech.edu/37093/7/1112.5435v1.pdf https://resolver.caltech.edu/CaltechAUTHORS:20130222-154859231 en eng American Astronomical Society https://authors.library.caltech.edu/37093/1/0004-637X_763_2_147.pdf https://authors.library.caltech.edu/37093/7/1112.5435v1.pdf Benson, B. A. and Lueker, M. and Padin, S. and Shirokoff, E. and Vieira, J. D. (2013) Cosmological Constraints from Sunyaev-Zel'dovich-selected Clusters with X-Ray Observations in the First 178 deg^2 of the South Pole Telescope Survey. Astrophysical Journal, 763 (2). Art. No. 147. ISSN 0004-637X. doi:10.1088/0004-637X/763/2/147. https://resolver.caltech.edu/CaltechAUTHORS:20130222-154859231 <https://resolver.caltech.edu/CaltechAUTHORS:20130222-154859231> other Article PeerReviewed 2013 ftcaltechauth https://doi.org/10.1088/0004-637X/763/2/147 2021-11-11T18:52:56Z We use measurements from the South Pole Telescope (SPT) Sunyaev-Zel'dovich (SZ) cluster survey in combination with X-ray measurements to constrain cosmological parameters. We present a statistical method that fits for the scaling relations of the SZ and X-ray cluster observables with mass while jointly fitting for cosmology. The method is generalizable to multiple cluster observables, and self-consistently accounts for the effects of the cluster selection and uncertainties in cluster mass calibration on the derived cosmological constraints. We apply this method to a data set consisting of an SZ-selected catalog of 18 galaxy clusters at z > 0.3 from the first 178 deg^2 of the 2500 deg^2 SPT-SZ survey, with 14 clusters having X-ray observations from either Chandra or XMM-Newton. Assuming a spatially flat ΛCDM cosmological model, we find the SPT cluster sample constrains σ_8(Ω_m /0.25)^(0.30) = 0.785 ± 0.037. In combination with measurements of the cosmic microwave background (CMB) power spectrum from the SPT and the seven-year Wilkinson Microwave Anisotropy Probe data, the SPT cluster sample constrains σ_8 = 0.795 ± 0.016 and Ω_m = 0.255 ± 0.016, a factor of 1.5 improvement on each parameter over the CMB data alone. We consider several extensions beyond the ΛCDM model by including the following as free parameters: the dark energy equation of state (w), the sum of the neutrino masses (Σm ν), the effective number of relativistic species (N_(eff)), and a primordial non-Gaussianity (f_(NL)). We find that adding the SPT cluster data significantly improves the constraints on w and Σm_ν beyond those found when using measurements of the CMB, supernovae, baryon acoustic oscillations, and the Hubble constant. Considering each extension independently, we best constrain w = –0.973 ± 0.063 and the sum of neutrino masses Σm_ν < 0.28 eV at 95% confidence, a factor of 1.25 and 1.4 improvement, respectively, over the constraints without clusters. Assuming a ΛCDM model with a free N_(eff) and Σm_ν, we measure N_(eff) = 3.91 ± 0.42 and constrain Σm_ν < 0.63 eV at 95% confidence. We also use the SPT cluster sample to constrain f_(NL) = –220 ± 317, consistent with zero primordial non-Gaussianity. Finally, we discuss the current systematic limitations due to the cluster mass calibration, and future improvements for the recently completed 2500 deg^2 SPT-SZ survey. The survey has detected ~500 clusters with a median redshift of ~0.5 and a median mass of ~2.3 × 10^(14) M_☉ h^(–1) and, when combined with an improved cluster mass calibration and existing external cosmological data sets will significantly improve constraints on w. Article in Journal/Newspaper South pole Caltech Authors (California Institute of Technology) Hubble ENVELOPE(158.317,158.317,-80.867,-80.867) South Pole Wilkinson ENVELOPE(-66.200,-66.200,-66.817,-66.817) The Astrophysical Journal 763 2 147 |