Determining H0 with Bayesian hyper-parameters
Abstract
We re-analyse recent Cepheid data to estimate the Hubble parameter H0 by using Bayesian hyper-parameters (HPs). We consider the two data sets from Riess et al. 2011 and 2016 (labelled R11 and R16, with R11 containing less than half the data of R16) and include the available anchor distances (megamaser system NGC4258, detached eclipsing binary distances to LMC and M31, and MW Cepheids with parallaxes), use a weak metallicity prior and no period cut for Cepheids. We find that part of the R11 data is down-weighted by the HPs but that R16 is mostly consistent with expectations for a Gaussian distribution, meaning that there is no need to down-weight the R16 data set. For R16, we find a value of H0 = 73.75 ± 2.11 km s-1 Mpc-1 if we use HPs for all data points (including Cepheid stars, supernovae type Ia, and the available anchor distances), which is about 2.6 σ larger than the Planck 2015 value of H0 = 67.81 ± 0.92 km s-1 Mpc-1 and about 3.1 σ larger than the updated Planck 2016 value 66.93 ± 0.62 km s-1 Mpc-1. If we perfom a standard χ2 analysis as in R16, we find H0 = 73.46 ± 1.40 (stat) km s-1 Mpc-1. We test the effect of different assumptions, and find that the choice of anchor distances affects the final value significantly. If we exclude the Milky Way from the anchors, then the value of H0 decreases. We find however no evident reason to exclude the MW data. The HP method used here avoids subjective rejection criteria for outliers and offers a way to test datasets for unknown systematics.
- Publication:
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Journal of Cosmology and Astroparticle Physics
- Pub Date:
- March 2017
- DOI:
- 10.1088/1475-7516/2017/03/056
- arXiv:
- arXiv:1611.06088
- Bibcode:
- 2017JCAP...03..056C
- Keywords:
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- Astrophysics - Cosmology and Nongalactic Astrophysics;
- General Relativity and Quantum Cosmology
- E-Print:
- 44 pages, 18 figures, 11 tables. Matches version accepted for publication in JCAP