Estimating systematic bias in gravitational-wave dark siren cosmology measurements

The discovery of GW170817 provided the first direct gravitational-wave measurement of the Hubble constant, H0, demonstrating the potential power of standard-siren cosmology. The dark siren approach can be utilized for gravitational-wave sources in the absence of an electromagnetic counterpart: one considers all galaxies contained within the localization volume as potential hosts. This method can be improved by weighting the potential host galaxies by their luminosities to account for physically-motivated prescriptions (e.g., tracing star formation or stellar mass). Using mock galaxy catalogs, we explore the impact of these weightings on the measurement of H0, focusing on the bias in H0 inference that results from incorrectly weighted prescriptions.