Journal
ASTROPHYSICAL JOURNAL
Volume 832, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/0004-637X/832/1/95
Keywords
cosmology: observations; galaxies: clusters: general
Categories
Funding
- National Science Foundation [PLR-1248097]
- NSF Physics Frontier Center [PHY-1125897]
- Kavli Foundation
- Gordon and Betty Moore Foundation [GBMF 947]
- Kavli Institute for Cosmological Physics at the University of Chicago through grant NSF [PHY-1125897]
- US Department of Energy [DE-AC02-76SF00515, DE-AC02-06CH11357]
- National Sciences and Engineering Research Council of Canada
- Canada Research Chairs program
- Canadian Institute for Advanced Research
- Miller Research Fellowship
- Natural Science and Engineering Research Council of Canada Postgraduate Scholarship-Doctoral award
- Fermi Research Alliance, LLC [De-AC02-07CH11359]
- United States Department of Energy
- German Federal Ministry of Economics and Technology (BMWi) [50 OR 1210, 50 OR 1407]
- Alfred P. Sloan Foundation
- University of Melbourne
- Australian Research Council [DP150103208]
- NSERC
- FRQNT
- DFG Cluster of Excellence Origin and Structure of the universe
- Transregio program TR33 The Dark universe
- Danish National Research Foundation
- NSF [ANT-1009649]
- Direct For Mathematical & Physical Scien
- Division Of Physics [1125897] Funding Source: National Science Foundation
- Directorate For Geosciences
- Office of Polar Programs (OPP) [1248097] Funding Source: National Science Foundation
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We present cosmological parameter constraints obtained from galaxy clusters identified by their SunyaevZel'dovich effect signature in the 2500 square-degree South Pole Telescope Sunyaev Zel'dovich (SPT-SZ) survey. We consider the 377 cluster candidates identified at z > 0.25 with a detection significance greater than five, corresponding to the 95% purity threshold for the survey. We compute constraints on cosmological models using the measured cluster abundance as a function of mass and redshift. We include additional constraints from multi-wavelength observations, including Chandra X-ray data for 82 clusters and a weak lensing-based prior on the normalization of the mass-observable scaling relations. Assuming a spatially flat Lambda CDM cosmology, we combine the cluster data with a prior on H-0 and find sigma(8)= 0.784. +/- 0.039 and Omega(m) = 0.289. +/- 0.042, with the parameter combination sigma(8) (Omega(m)/0.27)(0.3) = 0.797 +/- 0.031. These results are in good agreement with constraints from the cosmic microwave background (CMB) from SPT, WMAP, and Planck, as well as with constraints from other cluster data sets. We also consider several extensions to Lambda CDM, including models in which the equation of state of dark energy w, the species-summed neutrino mass, and/or the effective number of relativistic species (N-eff) are free parameters. When combined with constraints from the Planck CMB, H-0, baryon acoustic oscillation, and SNe, adding the SPT cluster data improves the w constraint by 14%, to w = -1.023 +/- 0.042.
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