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

Journal Article · · Monthly Notices of the Royal Astronomical Society

In this work, 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 percent and 29 percent 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 percent in distance.

Research Organization:
SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Stony Brook Univ., NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Organization:
SPT Collaboration
Grant/Contract Number:
AC02-76SF00515; SC0018053; AC02-07CH11359
OSTI ID:
1836366
Alternate ID(s):
OSTI ID: 1839567; OSTI ID: 1856526; OSTI ID: 1975957
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 Vol. 510 Journal Issue: 1; ISSN 0035-8711
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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