First cosmological results using Type Ia supernovae from the Dark Energy Survey: measurement of the Hubble constant
First cosmological results using Type Ia supernovae from the Dark Energy Survey: measurement of the Hubble constant
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DOI：
10.1093/mnras/stz978
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发表时间：
2018-11
影响因子：
4.8
通讯作者：
E. MacAulay;R. Nichol;David Bacon;D. Brout;T. Davis;B. Zhang;B. Bassett;D. Scolnic;A. Moller-A
中科院分区：
文献类型：
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作者：
E. MacAulay;R. Nichol;David Bacon;D. Brout;T. Davis;B. Zhang;B. Bassett;D. Scolnic;A. Moller-A
我们提出了一种改进的测量哈勃常数（H0）使用的“反距离阶梯”的方法，它将来自暗能量巡天（DES）的207颗Ia型超新星（SNe Ia）在红移0.018 < z < 0.85处的信息添加到现有的122颗低红移超新星的距离测量中（z < 0.07）超新星Ia（低z）和重子声振荡（BAO）的测量。传统的Ia型超新星的H0测量使用视差和造父变星的距离阶梯，而反距离阶梯则依赖于来自BAO的绝对距离测量来校准Ia型超新星的本征星等。我们发现H0 = 67.8 ± 1.3 km s−1 Mpc−1（统计和系统不确定性，68%置信度）。我们的测量对基本的宇宙学模型做了最小的假设，我们的分析是盲目的，以减少确认偏差。我们研究了可能的系统不确定性，所有这些都低于统计不确定性。我们的H0值与假设ΛCDM宇宙的宇宙微波背景辐射的估计一致。
We present an improved measurement of the Hubble constant (H0) using the ‘inverse distance ladder’ method, which adds the information from 207 Type Ia supernovae (SNe Ia) from the Dark Energy Survey (DES) at redshift 0.018 < z < 0.85 to existing distance measurements of 122 low-redshift (z < 0.07) SNe Ia (Low-z) and measurements of Baryon Acoustic Oscillations (BAOs). Whereas traditional measurements of H0 with SNe Ia use a distance ladder of parallax and Cepheid variable stars, the inverse distance ladder relies on absolute distance measurements from the BAOs to calibrate the intrinsic magnitude of the SNe Ia. We find H0 = 67.8 ± 1.3 km s−1 Mpc−1 (statistical and systematic uncertainties, 68 per cent confidence). Our measurement makes minimal assumptions about the underlying cosmological model, and our analysis was blinded to reduce confirmation bias. We examine possible systematic uncertainties and all are below the statistical uncertainties. Our H0 value is consistent with estimates derived from the Cosmic Microwave Background assuming a ΛCDM universe.