Publication details

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 Bradford BLEEM Lindsey E. EHLERT Steven R. FLOYD Benjamin HERBONNET Ricardo KELLY Patrick L. LIANG Shuang VON DER LINDEN Anja MCDONALD Michael RAPETTI David A. SCHMIDT Robert W. WERNER Norbert WRIGHT Adam

Year of publication 2022
Type Article in Periodical
Magazine / Source Monthly Notices of the Royal Astronomical Society
MU Faculty or unit

Faculty of Science

Keywords cosmological parameters; cosmology: observations; dark matter; distance scale; galaxies: clusters: general; X-rays: galaxies: clusters
Description 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.
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