2019/09/12 by Inh Jee, Sherry H. Suyu, Sherry Suyu +4 · 69 citations
Physics and Astronomy · #Angular diameter #Angular velocity #Astronomy and Astrophysical Research #Cosmology and Gravitation Theories #Gravitation #Gravitational constant #Gravitational lens #Hubble's law #Measure (data warehouse) #Pulsars and Gravitational Waves Research #Redshift #astro-ph.CO
paper · pdf · open access · doi:10.1126/science.aat7371
published in Science 365(6458), 1134-1138 (American Association for the Advancement of Science) · This paper presents the measurements of angular diameter distances to two time-delay lenses, and the Hubble constant derived only from these two distances and the JLA supernova sample. One of the distance measurements is further used for the cosmological inference in the H0LiCOW XIII paper (arxiv:1907.04869). Published in Science
openalex publication_date 2019/09/12 · arxiv created 2019/09/15 · arxiv updated 2019/09/17 · openalex created_date 2019/09/19 · openalex updated_date 2026/08/06
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.