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.
Haan, T. de, et al. "Cosmological constraints from Galaxy Clusters in 2500 square-degree SPT-SZ survey." The Astrophysical Journal (Online), vol. 832, no. 1, Nov. 2016. https://doi.org/10.3847/0004-637X/832/1/95
Haan, T. de, Benson, B. A., Bleem, L. E., Allen, S. W., Applegate, D. E., Ashby, M. L. N., Bautz, M., Bayliss, M., Bocquet, S., Brodwin, M., Carlstrom, J. E., Chang, C. L., Chiu, I., Cho, H-M., Clocchiatti, A., Crawford, T. M., Crites, A. T., Desai, S., ... Zenteno, A. (2016). Cosmological constraints from Galaxy Clusters in 2500 square-degree SPT-SZ survey. The Astrophysical Journal (Online), 832(1). https://doi.org/10.3847/0004-637X/832/1/95
Haan, T. de, Benson, B. A., Bleem, L. E., et al., "Cosmological constraints from Galaxy Clusters in 2500 square-degree SPT-SZ survey," The Astrophysical Journal (Online) 832, no. 1 (2016), https://doi.org/10.3847/0004-637X/832/1/95
@article{osti_1389305,
author = {Haan, T. de and Benson, B. A. and Bleem, L. E. and Allen, S. W. and Applegate, D. E. and Ashby, M. L. N. and Bautz, M. and Bayliss, M. and Bocquet, S. and Brodwin, M. and others},
title = {Cosmological constraints from Galaxy Clusters in 2500 square-degree SPT-SZ survey},
annote = {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.},
doi = {10.3847/0004-637X/832/1/95},
url = {https://www.osti.gov/biblio/1389305},
journal = {The Astrophysical Journal (Online)},
issn = {ISSN 1538-4357},
number = {1},
volume = {832},
place = {United States},
publisher = {Institute of Physics (IOP)},
year = {2016},
month = {11}}
USDOE Office of Science; National Science Foundation (NSF); Gordon and Betty Moore Foundation; Natural Sciences and Engineering Research Council of Canada (NSERC); Alfred P. Sloan Foundation
DOE Contract Number:
AC02-06CH11357
OSTI ID:
1389305
Journal Information:
The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 1 Vol. 832; ISSN 1538-4357