Cosmological constraints from gas mass fractions of massive, relaxed galaxy clusters
Cosmological constraints from gas mass fractions of massive, relaxed galaxy clusters
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来自大质量松弛星系团气体质量分数的宇宙学约束
DOI：
10.1093/mnras/stab3390
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发表时间：
2021
影响因子：
4.8
通讯作者：
Herbonnet, Ricardo
中科院分区：
文献类型：
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作者：
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
我们给出了最新的宇宙学约束，通过测量大质量、动力学松弛的星系团的气体质量分数(FGA)。我们的新数据集在暗能量模型上有更大的优势，这要归功于低红移的英仙座星系团的加入，红移≳1的两个新星系团，以及在0.6<；z<；0.9时对四个星团的显著延长的观测。我们的低红移(z<；0.16)fgas数据，与从宇宙微波背景(Cmb)测量的宇宙重子分数相结合，意味着哈勃常数h=0.722±0.067。结合完整的气体数据集和关于宇宙重子密度和哈勃常数的先验数据，我们将非平坦的兰姆达冷暗物质(宇宙常数)模型中的暗能量密度约束为ΩΛ=0.865 ±0.119，并将其状态方程约束为平坦的恒定w模型，分别比我们以前的工作紧41 / 和29 /min，并可与其他探测器提供的最佳约束相媲美。结合GAS、CMB、超新星和重子声振荡数据，我们还约束了具有全球曲率和演化暗能量的模型。对于这里使用的大质量松弛星团，我们发现气体与质量的比例与一个常数一致，其本征散射对应于距离仅为∼3 Per Cent。
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 redshiftsz≳ 1, and significantly longer observations of four clusters at 0.6 <z< 0.9. Our low-redshift (z< 0.16)fgasdata, combined with the cosmic baryon fraction measured from the cosmic microwave background (CMB), imply a Hubble constant ofh= 0.722 ± 0.067. Combining the fullfgasdata 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 bein flat, constant-wmodels, respectively 41 per cent and 29 per cent tighter than our previous work, and comparable to the best constraints available from other probes. Combiningfgas, 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 offgaswith mass to be consistent with a constant, with an intrinsic scatter that corresponds to just ∼3 per cent in distance.