Cosmological constraints from gas mass fractions of massive, relaxed galaxy clusters

Journal Article · 25 November 2021 · Monthly Notices of the Royal Astronomical Society

DOI: https://doi.org/10.1093/mnras/stab3390 · OSTI ID:1836366

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

ABSTRACT We present updated cosmological constraints from measurements of the gas mass fractions (fgas) 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) fgas 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 fgas 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 $$w=-1.13_{-0.20}^{+0.17}$$ 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 fgas, 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 fgas with mass to be consistent with a constant, with an intrinsic scatter that corresponds to just ∼3 per cent in distance.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Stony Brook University, NY (United States)
• Sponsoring Organization: USDOE; USDOE Office of Science (SC), High Energy Physics (HEP)
• Contributing Organization: SPT Collaboration
• Grant/Contract Number: AC02-07CH11359; AC02-76SF00515; SC0018053
• OSTI ID: 1836366
• Report Number(s): FERMILAB-PUB-21-728-PPD; arXiv:2111.09343
• Journal Information: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 1 Vol. 510; ISSN 0035-8711
• Publisher: Oxford University PressCopyright Statement
• Country of Publication: United Kingdom
• Language: English