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

Shajib, A J and Birrer, S and Desai, Shantanu and et al, . (2020) STRIDES: a 3.9 per cent measurement of the Hubble constant from the strong lens system DES J0408-5354. Monthly Notices of the Royal Astronomical Society, 494 (4). pp. 1-31. ISSN 0035-8711

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Abstract

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 DΔ t 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 m ∼ \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. © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.

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IITH Creators:

IITH Creators	ORCiD
Desai, Shantanu	https://orcid.org/0000-0002-0466-3288

Item Type:

Article

Additional Information:

AJS acknowledges the hospitality of the Aspen Center of Physics (ACP) and the Munich Institute for Astro- and Particle Physics (MIAPP) of the Excellence Cluster 'Universe', where part of this research was completed. ACP is supported by National Science Foundation grant PHY-1607611.

Uncontrolled Keywords:

cosmological parameters; cosmology: observations; distance scale; gravitational lensing: strong

Subjects:

Physics
Physics > Astronomy Astrophysics

Divisions:

Department of Physics

Depositing User:

. LibTrainee 2021

Date Deposited:

23 Nov 2022 12:20

Last Modified:

23 Nov 2022 12:20