TY - JOUR
T1 - Cosmological constraints from gas mass fractions of massive, relaxed galaxy clusters
AU - Mantz, Adam B.
AU - Allen, Steven W.
AU - Canning, Rebecca E. A.
AU - Baumont, Lucie
AU - Benson, Bradford
AU - Bleem, Lindsey E.
AU - Ehlert, Steven R.
AU - Floyd, Benjamin
AU - Herbonnet, Ricardo
AU - Kelly, Patrick L.
AU - Liang, Shuang
AU - Linden, Anja von der
AU - McDonald, Michael
AU - Rapetti, David A.
AU - Schmidt, Robert W.
AU - Werner, Norbert
AU - Wright, Adam
N1 - To be published in MNRAS. See https://github.com/abmantz/fgas-cosmo for code and https://github.com/abmantz/fgas-2021-paper for data presented in figures/tables
PY - 2022/2/1
Y1 - 2022/2/1
N2 - We present updated cosmological constraints from measurements of the gas mass fractions ( ƒgas ) 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 ≳ 1, and significantly longer observations of four clusters at 0.6 < z < 0.9. Our low-redshift ( z < 0.16) ƒgas 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 ƒgas data set with priors on the cosmic baryon density and the Hubble constant, we constrain the dark energy density to be ΩΛ = 0.865 ± 0.119 in non-flat Lambda cold dark matter (cosmological constant) models, and its equation of state to be w = −1 . 13 + 0 . 17 −0 . 20 in flat, constant -w models, respectively 41 per cent and 29 per cent tighter than our previous work, and comparable to the best constraints available from other probes. Combining ƒgas, 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 ƒgas with mass to be consistent with a constant, with an intrinsic scatter that corresponds to just ∼3 per cent in distance.
AB - We present updated cosmological constraints from measurements of the gas mass fractions ( ƒgas ) 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 ≳ 1, and significantly longer observations of four clusters at 0.6 < z < 0.9. Our low-redshift ( z < 0.16) ƒgas 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 ƒgas data set with priors on the cosmic baryon density and the Hubble constant, we constrain the dark energy density to be ΩΛ = 0.865 ± 0.119 in non-flat Lambda cold dark matter (cosmological constant) models, and its equation of state to be w = −1 . 13 + 0 . 17 −0 . 20 in flat, constant -w models, respectively 41 per cent and 29 per cent tighter than our previous work, and comparable to the best constraints available from other probes. Combining ƒgas, 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 ƒgas with mass to be consistent with a constant, with an intrinsic scatter that corresponds to just ∼3 per cent in distance.
KW - astro-ph.CO
KW - cosmological parameters
KW - cosmology: observations
KW - dark matter
KW - distance scale
KW - galaxies : clusters : general
KW - X-rays: galaxies: clusters
U2 - 10.1093/mnras/stab3390
DO - 10.1093/mnras/stab3390
M3 - Article
SN - 0035-8711
VL - 510
SP - 131
EP - 145
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 1
ER -