STRIDES: a 3.9 per cent measurement of the Hubble constant from the strong lens system DES J0408−5354

By Anowar J. Shajib, Simon Birrer, T. Treu, A. Agnello, Elizabeth Buckley-Geer, J. Chan, L. Christensen, C. Lemon, H. Lin, M. Millon and 81 more. Monthly notices of the Royal Astronomical Society, 2019

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We present a blind time-delay cosmographic analysis for the lens system DES J0408−5354. This system is extraordinary for the presence of two sets of multiple images at different redshifts, which provide the opportunity to obtain more information at the cost of increased modelling complexity with respect to previously analysed systems. We perform detailed modelling of the mass distribution for this lens system using three band Hubble Space Telescope imaging. We combine the measured time delays, line-of-sight central velocity dispersion of the deflector, and statistically constrained external convergence with our lens models to estimate two cosmological distances. We measure the ‘effective’ time-delay distance corresponding to the redshifts of the deflector and the lensed quasar $D_{\Delta t}^{\rm eff}=$$3382_{-115}^{+146}$ Mpc and the angular diameter distance to the deflector Dd = $1711_{-280}^{+376}$ Mpc, with covariance between the two distances. From these constraints on the cosmological distances, we infer the Hubble constant H0= $74.2_{-3.0}^{+2.7}$ km s−1 Mpc−1 assuming a flat ΛCDM cosmology and a uniform prior for Ωm as $\Omega _{\rm m} \sim \mathcal {U}(0.05, 0.5)$. This measurement gives the most precise constraint on H0 to date from a single lens. Our measurement is consistent with that obtained from the previous sample of six lenses analysed by the H0 Lenses in COSMOGRAIL’s Wellspring (H0LiCOW) collaboration. It is also consistent with measurements of H0 based on the local distance ladder, reinforcing the tension with the inference from early Universe probes, for example, with 2.2σ discrepancy from the cosmic microwave background measurement.

Subfields: Astronomy and Astrophysics, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/aac13c0486c10af740ef0062276a72222266a046

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Citations in the corpus

Cosmology Intertwined II: The Hubble Constant Tension (2020, unknown): “[32] DES Collaboration, A.”
TDCOSMO IV: Hierarchical time-delay cosmography -- joint inference of the Hubble constant and galaxy density profiles (2020, methodology): “For 23 of the SLACS lenses there are available external shear measurements by Shajib et al. (2020b), which we used, optionally, as a third constraint.”
Hubble Tension: The Evidence of New Physics (2023, background): “Adding a new H0LiCOW H0 result [174] (DES J0408-5354) reduces the statistical significance to 1.”
TDCOSMO. I. An exploration of systematic uncertainties in the inference of $H_0$ from time-delay cosmography (2019, methodology): “These steps are nontrivial from a modeling point of view, considering that the analysis of any single system currently requires a year of expert investigator time and on the order of a million CPU hours (e.g., Shajib et al. 2020).”