Gravitational wave (GW) and electromagnetic (EM) observations of neutron-star-black-hole (NSBH) mergers can provide precise local measurements of the Hubble constant (H0), ideal for resolving the current H0 tension. We perform end-to-end analyses of realistic populations of simulated NSBHs, incorporating both GW and EM selection for the first time. We show that NSBHs could achieve unbiased 1.5-2.4% precision H0 estimates by 2030. The achievable precision is strongly affected by the details of spin precession and tidal disruption, highlighting the need for improved modeling of NSBH mergers.
@article{arxiv.2012.06593,
title = {Prospects for Measuring the Hubble Constant with Neutron-Star-Black-Hole Mergers},
author = {Stephen M. Feeney and Hiranya V. Peiris and Samaya M. Nissanke and Daniel J. Mortlock},
journal= {arXiv preprint arXiv:2012.06593},
year = {2021}
}
Comments
Version published in Physical Review Letters. 10 pages, 3 figures. Code available at https://github.com/sfeeney/nsbh