| Abstract: |
The Dark Energy Spectroscopic Instrument (DESI) will perform a spectroscopic redshift survey of 24 million galaxies and quasars at the Kitt Peak National Observatory 4-m Mayall telescope from 2018–2023. These include 4M luminous red galaxies, 18M emission line galaxies, and 2.4M quasars with 0.7M Lyman-alpha forest lines-of-sight. These enable DESI to map the expansion history of the universe to redshift 3 with unprecedented accuracy using the baryon acoustic oscillation method. During bright time, DESI will observe an additional 10M nearby galaxies and 10M stars. I will describe the science reach of DESI, the new spectrographs fed by 5000 robotically positioned fiber optics, and the data systems for target selection, survey planning, simulations, and processing the data. While building off the heritage of previous galaxy redshift surveys, DESI is upgrading all aspects of the pipelines and algorithms to maximize the science reach of the new instrument and survey. |
