Target Selection for the DESI Peculiar Velocity Survey

Understand

We describe the target selection and characteristics of the DESI Peculiar Velocity Survey, the largest survey of peculiar velocities (PVs) using both the fundamental plane (FP) and the Tully-Fisher (TF) relationship planned to date.

• We detail how we identify suitable early-type galaxies (ETGs) for the FP and suitable late-type galaxies (LTGs) for the TF relation using the photometric data provided by the DESI Legacy Imaging Survey DR9.
• Subsequently, we provide targets for 373 533 ETGs and 118 637 LTGs within the DESI 5-year footprint.
• We validate these photometric selections using existing morphological classifications.