Dark Energy Survey Year 1 Results: A Precise H0 Estimate from DES Y1, BAO, and D/H Data
Dark Energy Survey Year 1 Results: A Precise H0 Estimate from DES Y1, BAO, and D/H Data
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DOI：
10.1093/mnras/sty1939
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发表时间：
2018-11-01
影响因子：
4.8
通讯作者：
Zuntz, J.
中科院分区：
文献类型：
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作者：
Abbott, T. M. C.;Abdalla, F. B.;Zuntz, J.
我们将暗能量调查第一年的聚类和弱透镜数据与重子声振荡和大爆炸核合成实验相结合，以约束哈勃常数。假设具有最小中微子质量 (Sigma m(v), = 0.06 eV) 的平坦 Lambda CDM 模型，我们发现 H-0 = 67.4(-1.2)(+1.1) km s(-1) Mpc(-1) (68% CL)。该结果完全独立于基于距离阶梯、宇宙微波背景各向异性（温度和偏振）和强透镜约束的哈勃常数测量。现在有五个数据集： (a) 没有共享的观测系统； (b) 每个都将哈勃常数限制在百分之几的水平上。我们比较了这五个独立估计值，发现作为一个集合，它们之间的差异在 2.5 sigma 水平上显着（chi(2)/dof = 24/11，超过概率 = 1.1%）。将一致性阈值设置为 30 sigma 后，我们将所有五个数据集组合起来，得出 H-0 = 69.3(-0.6)(+0.4) km s(-1) Mpc(-1)。
We combine Dark Energy Survey Year 1 clustering and weak lensing data with baryon acoustic oscillations and Big Bang nucleosynthesis experiments to constrain the Hubble constant. Assuming a flat Lambda CDM model with minimal neutrino mass (Sigma m(v), = 0.06 eV), we find H-0 = 67.4(-1.2)(+1.1) km s(-1) Mpc(-1) (68 per cent CL). This result is completely independent of Hubble constant measurements based on the distance ladder, cosmic microwave background anisotropies (both temperature and polarization), and strong lensing constraints. There are now five data sets that: (a) have no shared observational systematics; and (b) each constrains the Hubble constant with fractional uncertainty at the few-per cent level. We compare these five independent estimates, and find that, as a set, the differences between them are significant at the 2.5 sigma level (chi(2)/dof = 24/11, probability to exceed = 1.1 per cent). Having set the threshold for consistency at 30 sigma we combine all five data sets to arrive at H-0 = 69.3(-0.6)(+0.4) km s(-1) Mpc(-1).