# Hubble constant from GW events

I am trying to get the Hubble constant from gravitational wave events. On the GWOSC website, for all events, redshift and Luminosity distances are mentioned. Now, by this information, I can get my Hubble constant by the equation $$cz=H_0 D_l$$. By the above logic, I applied it to some events, but I am getting $$H_0$$ to be around $$47$$ km/s Mpc, which is very far away from around its actual predicted value. For example taking the GW190413_134308 event, on GWOSC, the redshift for this event is given as $$0.71$$ and the luminosity distance is given as $$4450$$. By the above equation, I am getting the $$H_0$$ value to be $$47.86$$ km/s Mpc.

I know I am doing something horribly wrong, can anyone please point this out to to me?

• Are you aware of the new paper arxiv.org/abs/2111.03604 where they do this calculation? Nov 18 '21 at 15:09