AWhat changed
Suyu and colleagues combined earlier measured time delays in the four-image lens B1608+656 with Hubble imaging, a new lens-galaxy velocity-dispersion measurement and an environment model. Their Bayesian analysis quantified how the density profile and matter along the line of sight affect a time-delay distance and cosmological inferences.
Scientific scope
Suyu and colleagues combined earlier measured time delays in the four-image lens B1608+656 with Hubble imaging, a new lens-galaxy velocity-dispersion measurement and an environment model. Their Bayesian analysis quantified how the density profile and matter along the line of sight affect a time-delay distance and cosmological inferences. For the specified fixed cosmology and their preferred imaging and external-convergence priors, the 2009 preprint reports H0 = 70.6 ± 3.1 km s−1 Mpc−1. This is not an assumption-free measurement: the central value and precision change under alternative external-convergence priors, and the result relies on lens and stellar-dynamics models, simulations and prior choices. The separate result H0 = 69.7 +4.9/−5.0 combines the lens with WMAP5 under flatness and a constant variable equation-of-state parameter. The original lens discovery, earlier time-delay measurements and 1964 time-delay concept are distinct earlier contributions; the study uses a single lens, not a sample of independently measured systems.
Evidence
The linked original works support the scoped statement and contribution attribution. WRS has not independently replayed experiments or reconstructed a full mathematical proof. For the specified fixed cosmology and their preferred imaging and external-convergence priors, the 2009 preprint reports H0 = 70.6 ± 3.1 km s−1 Mpc−1. This is not an assumption-free measurement: the central value and precision change under alternative external-convergence priors, and the result relies on lens and stellar-dynamics models, simulations and prior choices. The separate result H0 = 69.7 +4.9/−5.0 combines the lens with WMAP5 under flatness and a constant variable equation-of-state parameter. The original lens discovery, earlier time-delay measurements and 1964 time-delay concept are distinct earlier contributions; the study uses a single lens, not a sample of independently measured systems.
Contributors
- The named authors in the research record · SCIENCE: These are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.
Provisional WRS assessment, edition 2026-10-28.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.
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