Khaled Said

Khaled Said

The Dark Energy Spectroscopic Instrument (DESI) Peculiar Velocity Survey aims to measure the peculiar velocities of early- and late-type galaxies within the DESI footprint using both the Fundamental Plane and Tully-Fisher relations. These direct measurements promise to tighten constraints on the growth rate by a factor of 2.5 at z=0.1 compared to redshift-space distortions alone. I’ll present our method for assessing stellar velocity dispersions from DESI spectra and establishing the Fundamental Plane. After calibrating our sample using SBF, we constructed the Hubble diagram and estimated a Hubble constant of H0 = 76.05 ± 0.35 (statistical) ± 0.49 (systematic FP) ± 4.86 (statistical due to calibration) km s^-1 Mpc^-1. I’ll discuss key systematics and their impacts and look ahead to upcoming DESI releases and future surveys like WALLABY and 4HS.