The Hubble constant from eight time-delay galaxy lenses

Philipp Denzel, Jonathan P. Coles, Prasenjit Saha, Liliya L.R. Williams

Research output: Contribution to journalArticlepeer-review

35 Scopus citations


We present a determination of the Hubble constant from the joint, free-form analysis of eight strongly, quadruply lensing systems. In the concordance cosmology, we find H0 = 71.8+3.9-3.3 km s-1 Mpc-1 with a precision of 4.97 percent. This is in agreement with the latest measurements from supernovae Type Ia and Planck observations of the cosmic microwave background. Our precision is lower compared to these and other recent time-delay cosmography determinations, because our modelling strategies reflect the systematic uncertainties of lensing degeneracies. We furthermore are able to find reasonable lensed image reconstructions by constraining to either value of H0 from local and early Universe measurements. This leads us to conclude that current lensing constraints on H0 are not strong enough to break the 'Hubble tension' problem of cosmology.

Original languageEnglish (US)
Pages (from-to)784-801
Number of pages18
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
StatePublished - Feb 1 2021
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2020 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.


  • cosmological parameters
  • gravitational lensing: Strong


Dive into the research topics of 'The Hubble constant from eight time-delay galaxy lenses'. Together they form a unique fingerprint.

Cite this