Galaxy-dark matter connection from weak lensing in imaging surveys: Impact of photometric redshift errors

The uncertainties in photometric redshifts and stellar masses from imaging surveys affect galaxy sample selection, their abundance measurements, as well as the measured weak lensing signals. We develop a framework to assess the systematic effects arising from the use of redshifts and stellar masses derived from photometric data, and explore their impact on the inferred galaxy-dark matter connection. We use galaxy catalogues from the UniverseMachine (UM) galaxy formation model to create Pz-mock galaxy samples that approximately follow the redshift errors in the Subaru HSC survey. We focus on galaxy stellar-mass thresholds ranging from \(\log\left[M_*/(h^{-2}M_\odot)\right]\) from \(8.6\) to \(11.2\) in steps of 0.2 dex within two redshift bins \(0.30-0.55\) and \(0.55-0.80\). A comparison of the Pz-mock samples to true galaxy samples in UM shows a relatively mild sample contamination for thresholds with \(\log\left[M_{*,\rm limit}/(h^{-2}M_\odot)\right]