Reconstructing cosmic growth with kinetic Sunyaev-Zel’dovich observations in the era of stage IV experiments
Future ground-based cosmic microwave background (CMB) experiments will generate competitive large-scale structure data sets by precisely characterizing CMB secondary anisotropies over a large fraction of the sky. We describe a method for constraining the growth rate of structure to sub-1% precision...
| Main Authors: | , , , |
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| Format: | Journal article |
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American Physical Society
2016
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| _version_ | 1797075400613953536 |
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| author | Alonso, D Louis, T Bull, P Ferreira, P |
| author_facet | Alonso, D Louis, T Bull, P Ferreira, P |
| author_sort | Alonso, D |
| collection | OXFORD |
| description | Future ground-based cosmic microwave background (CMB) experiments will generate competitive large-scale structure data sets by precisely characterizing CMB secondary anisotropies over a large fraction of the sky. We describe a method for constraining the growth rate of structure to sub-1% precision out to z≈1, using a combination of galaxy cluster peculiar velocities measured using the kinetic Sunyaev-Zel'dovich (kSZ) effect, and the velocity field reconstructed from galaxy redshift surveys. We consider only thermal SZ-selected cluster samples, which will consist of O(104-105) sources for Stage 3 and 4 CMB experiments respectively. Three different methods for separating the kSZ effect from the primary CMB are compared, including a novel blind "constrained realization" method that improves signal-to-noise by a factor of ∼2 over a commonly-used aperture photometry technique. Assuming a correlation between the integrated tSZ y-parameter and the cluster optical depth, it should then be possible to break the kSZ velocity-optical depth degeneracy. The effects of including CMB polarization and SZ profile uncertainties are also considered. In the absence of systematics, a combination of future Stage 4 experiments should be able to measure the product of the growth and expansion rates, α≡fH, to better than 1% in bins of Δz=0.1 out to z≈1 - competitive with contemporary redshift-space distortion constraints from galaxy surveys. We conclude with a discussion of the likely impact of various systematics. |
| first_indexed | 2024-03-06T23:49:53Z |
| format | Journal article |
| id | oxford-uuid:723d8f38-8c72-475f-8e22-c546ad97ea01 |
| institution | University of Oxford |
| last_indexed | 2024-03-06T23:49:53Z |
| publishDate | 2016 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | oxford-uuid:723d8f38-8c72-475f-8e22-c546ad97ea012022-03-26T19:48:46ZReconstructing cosmic growth with kinetic Sunyaev-Zel’dovich observations in the era of stage IV experimentsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:723d8f38-8c72-475f-8e22-c546ad97ea01Symplectic Elements at OxfordAmerican Physical Society2016Alonso, DLouis, TBull, PFerreira, PFuture ground-based cosmic microwave background (CMB) experiments will generate competitive large-scale structure data sets by precisely characterizing CMB secondary anisotropies over a large fraction of the sky. We describe a method for constraining the growth rate of structure to sub-1% precision out to z≈1, using a combination of galaxy cluster peculiar velocities measured using the kinetic Sunyaev-Zel'dovich (kSZ) effect, and the velocity field reconstructed from galaxy redshift surveys. We consider only thermal SZ-selected cluster samples, which will consist of O(104-105) sources for Stage 3 and 4 CMB experiments respectively. Three different methods for separating the kSZ effect from the primary CMB are compared, including a novel blind "constrained realization" method that improves signal-to-noise by a factor of ∼2 over a commonly-used aperture photometry technique. Assuming a correlation between the integrated tSZ y-parameter and the cluster optical depth, it should then be possible to break the kSZ velocity-optical depth degeneracy. The effects of including CMB polarization and SZ profile uncertainties are also considered. In the absence of systematics, a combination of future Stage 4 experiments should be able to measure the product of the growth and expansion rates, α≡fH, to better than 1% in bins of Δz=0.1 out to z≈1 - competitive with contemporary redshift-space distortion constraints from galaxy surveys. We conclude with a discussion of the likely impact of various systematics. |
| spellingShingle | Alonso, D Louis, T Bull, P Ferreira, P Reconstructing cosmic growth with kinetic Sunyaev-Zel’dovich observations in the era of stage IV experiments |
| title | Reconstructing cosmic growth with kinetic Sunyaev-Zel’dovich observations in the era of stage IV experiments |
| title_full | Reconstructing cosmic growth with kinetic Sunyaev-Zel’dovich observations in the era of stage IV experiments |
| title_fullStr | Reconstructing cosmic growth with kinetic Sunyaev-Zel’dovich observations in the era of stage IV experiments |
| title_full_unstemmed | Reconstructing cosmic growth with kinetic Sunyaev-Zel’dovich observations in the era of stage IV experiments |
| title_short | Reconstructing cosmic growth with kinetic Sunyaev-Zel’dovich observations in the era of stage IV experiments |
| title_sort | reconstructing cosmic growth with kinetic sunyaev zel dovich observations in the era of stage iv experiments |
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