Kavli Affiliate: Risa H. Wechsler
| First 5 Authors: Andrew P. Cooper, Sergey E. Koposov, Carlos Allende Prieto, Christopher J. Manser, Namitha Kizhuprakkat
| Summary:
We describe the Milky Way Survey (MWS) that will be undertaken with the Dark
Energy Spectroscopic Instrument (DESI) on the Mayall 4m Telescope at the Kitt
Peak National Observatory. Over the next 5 years DESI MWS will observe
approximately 7 million stars at Galactic latitudes |b|>20 deg, with an
inclusive target selection scheme focused on the thick disk and stellar halo.
MWS will also include several high-completeness samples of rare stellar types,
including white dwarfs, low-mass stars within 100pc of the Sun, and horizontal
branch stars. We summarize the potential of DESI to advance understanding of
Galactic structure and stellar evolution. We introduce the final definitions of
the main MWS target classes and estimate the number of stars in each class that
will be observed. We describe our pipelines to derive radial velocities,
atmospheric parameters and chemical abundances. We use ~500,000 spectra of
unique stellar targets from the DESI Survey Validation program (SV) to
demonstrate that our pipelines can measure radial velocities to approximately 1
km/s and [Fe/H] accurate to approximately 0.2 dex for typical stars in our main
sample. We find stellar parameter distributions from 100 sq. deg. of SV
observations with >90% completeness on our main sample are in good agreement
with expectations from mock catalogues and previous surveys.
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