Cluster Cosmology Constraints from the 2500 deg2 SPT-SZ Survey: Inclusion of Weak Gravitational Lensing Data from Magellan and the Hubble Space Telescope

By S. Bocquet, J. Dietrich, T. Schrabback, L. Bleem, Michel C. A. Klein, S. Allen, D. Applegate, M. Ashby, M. Bautz, M. Bayliss and 70 more. Astrophysical Journal, 2018

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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, σ8 = 0.781 ± 0.037, and σ8(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. 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.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/2e89a2f164c48afe5cdb321e601661afcda0a504

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Citations in the corpus

PICO: Probe of Inflation and Cosmic Origins (2019, background): “A similar level of tension for σ8 (∼ 2σ ) arises when comparing Planck CMB spectra and cluster counts from Planck and other surveys [138, 139].”
The Atacama Cosmology Telescope: A Catalog of >4000 Sunyaev–Zel’dovich Galaxy Clusters (2020, methodology): “In particular, we used redshifts from previously published SZ surveys by ACT (Menanteau et al. 2013; Sifón et al. 2016; Hilton et al. 2018), Planck (Planck Collaboration et al. 2016b), and SPT (Bleem et al. 2015b, 2020; Bocquet et al. 2019); optically selected cluster catalogs based on SDSS (Wen et ”
Measurements of the E -mode polarization and temperature- E -mode correlation of the CMB from SPT-3G 2018 data (2021, methodology): “2σ higher than the SZ-selected galaxy cluster measurement from the SPT-SZ survey [72].”
KiDS+VIKING-450: Cosmic shear tomography with optical and infrared data (2018, background): “…of type Ia (e.g. Betoule et al. 2014) over galaxy redshift surveys (e.g. Alam et al. 2017), determinations of the galaxy cluster mass function (e.g. Bocquet et al. 2019), to measurements of gravitational lensing (Jee et al. 2016; Hildebrandt et al. 2017; Troxel et al. 2018a; Hikage et al. 2019).”