Measuring the Hubble constant with neutron star black hole mergers

Understand

The detection of GW170817 and the identification of its host galaxy have allowed for the first standard-siren measurement of the Hubble constant, with an uncertainty of $\sim 14\%$.

• As more detections of binary neutron stars with redshift measurement are made, the uncertainty will shrink.
• The dominating factors will be the number of joint detections and the uncertainty on the luminosity distance of each event.
• Neutron star black hole mergers are also promising sources for advanced LIGO and Virgo.