A measurement of the Hubble constant from angular diameter distances to two gravitational lenses
Year: 2019
Type: article
Abstract: The local expansion rate of the Universe is parametrized by the Hubble constant, [Formula: see text], the ratio between recession velocity and distance. Different techniques lead to inconsistent estimates of [Formula: see text] Observations of Type Ia supernovae (SNe) can be used to measure [Formula: see text], but this requires an external calibrator to convert relative distances to absolute ones. We use the angular diameter distance to strong gravitational lenses as a suitable calibrator, which is only weakly sensitive to cosmological assumptions. We determine the angular diameter distances to two gravitational lenses, [Formula: see text] and [Formula: see text] megaparsec, at redshifts [Formula: see text] and 0.6304. Using these absolute distances to calibrate 740 previously measured relative distances to SNe, we measure the Hubble constant to be [Formula: see text] kilometers per second per megaparsec.
Source: Science
Authors: Inh Jee, Sherry H. Suyu, Eiichiro Komatsu, Christopher D. Fassnacht, Stefan Hilbert, Léon V. E. Koopmans
Institutions: Max Planck Institute for Astrophysics, Institute of Astronomy and Astrophysics, Academia Sinica, Technical University of Munich, Academia Sinica, Kavli Institute for the Physics and Mathematics of the Universe, The University of Tokyo, University of California, Davis, Excellence Cluster Universe, Ludwig-Maximilians-Universität München, University of Groningen
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2972836678