TY - JOUR
T1 - Overview of the DESI Milky Way Survey
AU - DESI Collaboration
AU - Cooper, Andrew P.
AU - Koposov, Sergey E.
AU - Allende Prieto, Carlos
AU - Manser, Christopher J.
AU - Kizhuprakkat, Namitha
AU - Myers, Adam D.
AU - Dey, Arjun
AU - Gänsicke, Boris T.
AU - Li, Ting S.
AU - Rockosi, Constance
AU - Valluri, Monica
AU - Najita, Joan
AU - Deason, Alis
AU - Raichoor, Anand
AU - Wang, M. Y.
AU - Ting, Y. S.
AU - Kim, Bokyoung
AU - Carrillo, Andreia
AU - Wang, Wenting
AU - Beraldo e Silva, Leandro
AU - Han, Jiwon Jesse
AU - Ding, Jiani
AU - Sánchez-Conde, Miguel
AU - Aguilar, Jessica N.
AU - Ahlen, Steven
AU - Bailey, Stephen
AU - Belokurov, Vasily
AU - Brooks, David
AU - Cunha, Katia
AU - Dawson, Kyle
AU - de la Macorra, Axel
AU - Doel, Peter
AU - Eisenstein, Daniel J.
AU - Fagrelius, Parker
AU - Fanning, Kevin
AU - Font-Ribera, Andreu
AU - Forero-Romero, Jaime E.
AU - Gaztañaga, Enrique
AU - A Gontcho, Satya Gontcho
AU - Guy, Julien
AU - Honscheid, Klaus
AU - Kehoe, Robert
AU - Kisner, Theodore
AU - Kremin, Anthony
AU - Landriau, Martin
AU - Levi, Michael E.
AU - Martini, Paul
AU - Meisner, Aaron M.
AU - Miquel, Ramon
AU - Percival, Will J.
N1 - Accepted for publication in ApJ, 44 pages, 25 figures, 4 tables, one of a suite of 8 papers detailing targeting for DESI; v2 added links to data shown in figures, added citations to other DESI papers, corrected author list and minor typos; v3 fixed minor errors in Fig. 6 and clarified associated text; v4 updated to include minor changes in response to review
PY - 2023/4/18
Y1 - 2023/4/18
N2 - We describe the Milky Way Survey (MWS) that will be undertaken with the Dark Energy Spectroscopic Instrument (DESI) on the Mayall 4 m telescope at the Kitt Peak National Observatory. Over the next 5 yr DESI MWS will observe approximately seven million stars at Galactic latitudes ∣b∣ > 20°, 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 100 pc of the Sun, and horizontal branch stars. We summarize the potential of DESI to advance understanding of the 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 for deriving 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 ≃1 km s−1 and [Fe/H] accurate to ≃0.2 dex for typical stars in our main sample. We find the stellar parameter distributions from ≈100 deg2 of SV observations with ≳90% completeness on our main sample are in good agreement with expectations from mock catalogs and previous surveys.
AB - We describe the Milky Way Survey (MWS) that will be undertaken with the Dark Energy Spectroscopic Instrument (DESI) on the Mayall 4 m telescope at the Kitt Peak National Observatory. Over the next 5 yr DESI MWS will observe approximately seven million stars at Galactic latitudes ∣b∣ > 20°, 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 100 pc of the Sun, and horizontal branch stars. We summarize the potential of DESI to advance understanding of the 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 for deriving 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 ≃1 km s−1 and [Fe/H] accurate to ≃0.2 dex for typical stars in our main sample. We find the stellar parameter distributions from ≈100 deg2 of SV observations with ≳90% completeness on our main sample are in good agreement with expectations from mock catalogs and previous surveys.
KW - UKRI
KW - STFC
KW - ST/T000406/1
UR - http://www.scopus.com/inward/record.url?scp=85153533198&partnerID=8YFLogxK
U2 - 10.3847/1538-4357/acb3c0
DO - 10.3847/1538-4357/acb3c0
M3 - Article
AN - SCOPUS:85153533198
SN - 0004-637X
VL - 947
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1
M1 - 37
ER -