Cosmological constraints from galaxy clusters in the 2500 square-degree spt-sz survey [electronic resource].
- Washington, D.C. : United States. Dept. of Energy, 2016.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
- Physical Description:
- Article numbers 95 : digital, PDF file
- Additional Creators:
- SLAC National Accelerator Laboratory
United States. Department of Energy
United States. Department of Energy. Office of Scientific and Technical Information
- Here, we present cosmological constraints obtained from galaxy clusters identified by their Sunyaev-Zel'dovich effect signature in the 2500 square degree South Pole Telescope Sunyaev Zel'dovich 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 also 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 LCDM cosmology, where the species-summed neutrino mass has the minimum allowed value (mnu = 0.06 eV) from neutrino oscillation experiments, we combine the cluster data with a prior on H0 and find σ<sub>8</sub> = 0.797±0.031 and Ω<sub>m</sub> = 0.289±0.042, with the parameter combination σ<sub>8</sub>(Ω<sub>m</sub>/0.27)<sup>0.3</sup> = 0.784±0.039. These results are in good agreement with constraints from the CMB from SPT, WMAP, and Planck, as well as with constraints from other cluster datasets. Adding mnu as a free parameter, we find mnu = 0.14±0.08 eV when combining the SPT cluster data with Planck CMB data and BAO data, consistent with the minimum allowed value. Finally, we consider a cosmology where mnu and N<sub>eff</sub> are fixed to the LCDM values, but the dark energy equation of state parameter w is free. Using the SPT cluster data in combination with an H<sub>0</sub> prior, we measure w = -1.28±0.31, a constraint consistent with the LCDM cosmological model and derived from the combination of growth of structure and geometry. When combined with primarily geometrical constraints from Planck CMB, H<sub>0</sub>, BAO and SNe, adding the SPT cluster data improves the w constraint from the geometrical data alone by 14%, to w = -1.023±0.042.
- Published through SciTech Connect.
The Astrophysical Journal (Online) 832 1 ISSN 1538-4357 AM
T. de Haan; B. A. Benson; L. E. Bleem; S. W. Allen; D. E. Applegate; M. L. N. Ashby; M. Bautz; M. Bayliss; S. Bocquet; M. Brodwin; J. E. Carlstrom; C. L. Chang; I. Chiu; H-M. Cho; A. Clocchiatti; T. M. Crawford; A. T. Crites; S. Desai; J. P. Dietrich; M. A. Dobbs; A. N. Doucouliagos; R. J. Foley; W. R. Forman; G. P. Garmire; E. M. George; et al.
- Funding Information:
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