Cosmological Constraints from Gas Mass Fractions of Massive, Relaxed Galaxy Clusters

Mantz, Adam B.; Morris, R. Glenn; Allen, Steven W.; Canning, Rebecca E. A.; Baumont, Lucie; Benson, B. A.; Bleem, Lindsey E.; Ehlert, Steven R.; Floyd, Benjamin T.; Herbonnet, Ricardo

doi:10.1093/mnras/stab3390

Cosmological Constraints from Gas Mass Fractions of Massive, Relaxed Galaxy Clusters

Journal Article · 01 February 2022 · Monthly Notices of the Royal Astronomical Society

DOI:https://doi.org/10.1093/mnras/stab3390· OSTI ID:1903783

Mantz, Adam B.; Morris, R. Glenn; Allen, Steven W.; Canning, Rebecca E. A.; Baumont, Lucie; Benson, B. A.; Bleem, Lindsey E.; Ehlert, Steven R.; Floyd, Benjamin T.; Herbonnet, Ricardo

We present updated cosmological constraints from measurements of the gas mass fractions (f(gas)) of massive, dynamically relaxed galaxy clusters. Our new data set has greater leverage on models of dark energy, thanks to the addition of the Perseus cluster at low redshifts, two new clusters at redshifts z greater than or similar to 1, and significantly longer observations of four clusters at 0.6 < z < 0.9. Our low-redshift (z < 0.16) f(gas) data, combined with the cosmic baryon fraction measured from the cosmic microwave background (CMB), imply a Hubble constant of h = 0.722 +/- 0.067. Combining the full f(gas) data set with priors on the cosmic baryon density and the Hubble constant, we constrain the dark energy density to be Omega(Lambda) = 0.865 +/- 0.119 in non-flat Lambda cold dark matter (cosmological constant) models, and its equation of state to be in flat, constant-w models, respectively 41percent and 29percent tighter than our previous work, and comparable to the best constraints available from other probes. Combining f(gas), CMB, supernova, and baryon acoustic oscillation data, we also constrain models with global curvature and evolving dark energy. For the massive, relaxed clusters employed here, we find the scaling of f(gas) with mass to be consistent with a constant, with an intrinsic scatter that corresponds to just similar to 3percent in distance.

Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Aeronautics and Space Administration (NASA); South Pole Telescope - 3G; Gordon and Betty Moore Foundation; University of Chicago - Kavli Institute for Cosmological Physics

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1903783

Journal Information:: Monthly Notices of the Royal Astronomical Society, Vol. 510, Issue 1

Country of Publication:: United States

Language:: English

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Cosmological Constraints from Gas Mass Fractions of Massive, Relaxed Galaxy Clusters

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