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H0ly Cow! A New Measurement of the Hubble Constant

12 Jul 2019, 14:57 UTC
H0ly Cow! A New Measurement of the Hubble Constant
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Title: A SHARP view of H0LiCOW: H0 from three time-delay gravitational lens systems with adaptive optics imagingAuthors: Geoff C.-F. Chen, Christopher D. Fassnacht, Sherry. H. Suyu, et al.First Author’s Institution: Department of Physics, University of California, Davis, CA 95616, USAStatus: Submitted to MNRAS; open access on the arXiv A Growing Universe… and TensionThe rate of expansion of the universe is governed by a parameter called the Hubble constant (H0), measured in units km/s/Mpc (the “clunky-looking” units are explained well in this astrobite). H0 is one of the most important cosmological parameters––it can constrain models of the evolution of our universe––but there are two sets of observationally measured H0 values that significantly disagree with each other. The first type of measurement comes from astronomers who look at the “early” universe by studying the cosmic microwave background (CMB) and baryon acoustic oscillations (BAO), which give snapshots of the universe at only a few hundred thousand years old. A recent measurement of H0 from using this method was made by the Planck satellite, with a value of H0 = 67.27 +/- 0.6 km/s/Mpc. However, astronomers who look at the “late” universe, when the universe is billions of years old, are studying Type-Ia supernovae ...

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