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A measurement of the Hubble constant from angular diameter distances to two gravitational lenses
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A measurement of the Hubble constant from angular diameter distances to two gravitational lenses
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Journal Article
A measurement of the Hubble constant from angular diameter distances to two gravitational lenses
2019
Overview
The local expansion rate of the Universe is parametrized by the Hubble constant, H0, the ratio between recession velocity and distance. Different techniques lead to inconsistent estimates of H0. Observations of Type Ia supernovae (SNe) can be used to measure H0, 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,
810
-
130
+
160
and
1230
-
150
+
180
megaparsec, at redshifts z = 0.295 and 0.6304. Using these absolute distances to calibrate 740 previously measured relative distances to SNe, we measure the Hubble constant to be
H
0
=
82
.
4
-
8
.
3
+
8
.
4
kilometers per second per megaparsec.
Publisher
American Association for the Advancement of Science,The American Association for the Advancement of Science
