The Hubble constant from eight time-delay galaxy lenses

Author:

Denzel Philipp12ORCID,Coles Jonathan P3,Saha Prasenjit12ORCID,Williams Liliya L R4

Affiliation:

1. Institute for Computational Science, University of Zurich, CH-8057 Zurich, Switzerland

2. Physics Institute, University of Zurich, CH-8057 Zurich, Switzerland

3. Physik-Department T38, Technische Universität München, James-Franck-Str. 1, D-85748 Garching, Germany

4. School of Physics and Astronomy, University of Minnesota, 116 Church Street SE, Minneapolis, MN 55455, USA

Abstract

ABSTRACT 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 $H_0{} = 71.8^{+3.9}_{-3.3}\, \mathrm{km}\, \mathrm{s}^{-1}\, \mathrm{Mpc}^{-1}{}{}$ with a precision of $4.97{{\ \rm per\ cent}}$. 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.

Funder

Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung

National Aeronautics and Space Administration

European Space Agency

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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