U.S. Department of Energy Office of Scientific and Technical Information
Cluster Cosmology Constraints from the 2500 deg2 SPT-SZ Survey: Inclusion of Weak Gravitational Lensing Data from Magellan and the Hubble Space Telescope
Journal Article·· The Astrophysical Journal (Online)
We derive cosmological constraints using a galaxy cluster sample selected from the 2500 deg2 SPT-SZ survey. The sample spans the redshift range 0.25 < z < 1.75 and contains 343 clusters with SZ detection significance ξ > 5. The sample is supplemented with optical weak gravitational lensing measurements of 32 clusters with 0.29 < z < 1.13 (from Magellan and Hubble Space Telescope) and X-ray measurements of 89 clusters with 0.25 < z < 1.75 (from Chandra). We rely on minimal modeling assumptions: (i) weak lensing provides an accurate means of measuring halo masses, (ii) the mean SZ and X-ray observables are related to the true halo mass through power-law relations in mass and dimensionless Hubble parameter E(z) with a priori unknown parameters, and (iii) there is (correlated, lognormal) intrinsic scatter and measurement noise relating these observables to their mean relations. We simultaneously fit for these astrophysical modeling parameters and for cosmology. Assuming a flat νΛCDM model, in which the sum of neutrino masses is a free parameter, we measure Ωm = 0.276 ± 0.047, σ 8 = 0.781 ± 0.037, and σ 8(Ωm/0.3)0.2 = 0.766 ±0.025. The redshift evolutions of the X-ray YX–mass and Mgas–mass relations are both consistent with self-similar evolution to within 1σ. The mass slope of the YX–mass relation shows a 2.3σ deviation from self-similarity. Similarly, the mass slope of the Mgas–mass relation is steeper than self-similarity at the 2.5σ level. In a νwCDM cosmology, we measure the dark energy equation-of-state parameter w = -1.55 ± 0.41 from the cluster data. Here, we perform a measurement of the growth of structure since redshift z ~ 1.7 and find no evidence for tension with the prediction from general relativity. This is the first analysis of the SPT cluster sample that uses direct weak-lensing mass calibration and is a step toward using the much larger weak-lensing data set from DES. We provide updated redshift and mass estimates for the SPT sample.
Bocquet, S., et al. "Cluster Cosmology Constraints from the 2500 deg<sup>2</sup> SPT-SZ Survey: Inclusion of Weak Gravitational Lensing Data from Magellan and the <em>Hubble Space Telescope</em>." The Astrophysical Journal (Online), vol. 878, no. 1, Jun. 2019. https://doi.org/10.3847/1538-4357/ab1f10
Bocquet, S., Dietrich, J. P., Schrabback, T., Bleem, L. E., Klein, M., Allen, S. W., Applegate, D. E., Ashby, M. L. N., Bautz, M., Bayliss, M., Benson, B. A., Brodwin, M., Bulbul, E., Canning, R. E. A., Capasso, R., Carlstrom, J. E., Chang, C. L., Chiu, I., ... Zenteno, A. (2019). Cluster Cosmology Constraints from the 2500 deg<sup>2</sup> SPT-SZ Survey: Inclusion of Weak Gravitational Lensing Data from Magellan and the <em>Hubble Space Telescope</em>. The Astrophysical Journal (Online), 878(1). https://doi.org/10.3847/1538-4357/ab1f10
Bocquet, S., Dietrich, J. P., Schrabback, T., et al., "Cluster Cosmology Constraints from the 2500 deg<sup>2</sup> SPT-SZ Survey: Inclusion of Weak Gravitational Lensing Data from Magellan and the <em>Hubble Space Telescope</em>," The Astrophysical Journal (Online) 878, no. 1 (2019), https://doi.org/10.3847/1538-4357/ab1f10
@article{osti_1490847,
author = {Bocquet, S. and Dietrich, J. P. and Schrabback, T. and Bleem, L. E. and Klein, M. and Allen, S. W. and Applegate, D. E. and Ashby, M. L. N. and Bautz, M. and Bayliss, M. and others},
title = {Cluster Cosmology Constraints from the 2500 deg<sup>2</sup> SPT-SZ Survey: Inclusion of Weak Gravitational Lensing Data from Magellan and the <em>Hubble Space Telescope</em>},
annote = {We derive cosmological constraints using a galaxy cluster sample selected from the 2500 deg2 SPT-SZ survey. The sample spans the redshift range 0.25 5. The sample is supplemented with optical weak gravitational lensing measurements of 32 clusters with 0.29 Hubble Space Telescope) and X-ray measurements of 89 clusters with 0.25 m = 0.276 ± 0.047, σ 8 = 0.781 ± 0.037, and σ 8(Ωm/0.3)0.2 = 0.766 ±0.025. The redshift evolutions of the X-ray Y X–mass and M gas–mass relations are both consistent with self-similar evolution to within 1σ. The mass slope of the Y X–mass relation shows a 2.3σ deviation from self-similarity. Similarly, the mass slope of the M gas–mass relation is steeper than self-similarity at the 2.5σ level. In a νwCDM cosmology, we measure the dark energy equation-of-state parameter w = -1.55 ± 0.41 from the cluster data. Here, we perform a measurement of the growth of structure since redshift z ~ 1.7 and find no evidence for tension with the prediction from general relativity. This is the first analysis of the SPT cluster sample that uses direct weak-lensing mass calibration and is a step toward using the much larger weak-lensing data set from DES. We provide updated redshift and mass estimates for the SPT sample.},
doi = {10.3847/1538-4357/ab1f10},
url = {https://www.osti.gov/biblio/1490847},
journal = {The Astrophysical Journal (Online)},
issn = {ISSN 1538-4357},
number = {1},
volume = {878},
place = {United States},
publisher = {Institute of Physics (IOP)},
year = {2019},
month = {06}}
Argonne National Laboratory (ANL), Argonne, IL (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
National Aeronautic and Space Administration (NASA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
