Constraints on the Hubble constant from Supernova Refsdal's reappearance
Abstract
The gravitationally lensed Supernova Refsdal appeared in multiple images, produced through gravitational lensing by a massive foreground galaxy cluster. After the supernova appeared in 2014, lens models of the galaxy cluster predicted an additional image of the supernova would appear in 2015, which was subsequently observed. We use the time delays between the images to perform a blinded measurement of the expansion rate of the Universe, quantified by the Hubble constant (H0). Using eight cluster lens models, we infer H0 = 64.8 +4.4-4.3 km / s / Mpc, where Mpc is the megaparsec. Using the two models most consistent with the observations, we find H0 = 66.6 +4.1-3.3 km / s / Mpc. The observations are best reproduced by models that assign dark-matter halos to individual galaxies and the overall cluster.
Cite
@article{arxiv.2305.06367,
title = {Constraints on the Hubble constant from Supernova Refsdal's reappearance},
author = {Patrick L. Kelly and Steven Rodney and Tommaso Treu and Masamune Oguri and Wenlei Chen and Adi Zitrin and Simon Birrer and Vivien Bonvin and Luc Dessart and Jose M. Diego and Alexei V. Filippenko and Ryan J. Foley and Daniel Gilman and Jens Hjorth and Mathilde Jauzac and Kaisey Mandel and Martin Millon and Justin Pierel and Keren Sharon and Stephen Thorp and Liliya Williams and Tom Broadhurst and Alan Dressler and Or Graur and Saurabh Jha and Curtis McCully and Marc Postman and Kasper Borello Schmidt and Brad E. Tucker and Anja von der Linden},
journal= {arXiv preprint arXiv:2305.06367},
year = {2023}
}
Comments
Published in Science on May 11, 2023; this version updated to reflect minor edits to galley proofs. Companion paper presenting time-delay and relative magnification measurements published in ApJ (DOI: 10.3847/1538-4357/ac4ccb)