Andrew Cooper (National Tsing Hua University)
I will introduce the Dark Energy Spectroscopic Instrument (DESI), a new 5000-fibre wide-field spectrograph on the 4m Mayall telescope. From 2020 to 2025, DESI will survey a 14,000 square degree footprint to obtain optical/NIR spectra at resolution R=2000-5500 for roughly 35M galaxies and up to 10M stars. I will explain why this enormous dataset will be an unprecedented resource for discoveries in cosmology, galaxy formation and the history of the Milky Way. I’ll also describe the Legacy Survey (LS), DESI’s companion g, r and z-band imaging program over the same footprint. Images from LS are ~2 mag. deeper than those of SDSS, with finer resolution. The LS observations were recently completed and a large fraction of the images and catalogs are already public. I’ll talk briefly about my work as part of the DESI Milky Way Survey and the problems in Galactic Archaeology we will tackle with DESI and LS data. Finally I’ll set out routes for engaging with DESI and LS in Taiwan, through the use of public data, synergy with other missions such as PFS, and opportunities for student participation in the DESI Milky Way and Bright Galaxy survey programs at NTHU.