Prospects for Measuring the Hubble Constant with Neutron-Star-Black-Hole Mergers
Stephen M Feeney1, Hiranya V Peiris1,2, Samaya M Nissanke3,4
1Department of Physics & Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom.
Abstract:
Gravitational wave (GW) and electromagnetic (EM) observations of neutron-star-black-hole (NSBH) mergers can provide precise local measurements of the Hubble constant (H_{0}), ideal for resolving the current H_{0} 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 H_{0} 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.
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