The DESI Bright Galaxy Survey: Final Target Selection, Design, and Validation

Abstract Over the next 5 yr, the Dark Energy Spectroscopic Instrument (DESI) will use 10 spectrographs with 5000 fibers on the 4 m Mayall Telescope at Kitt Peak National Observatory to conduct the first Stage IV dark energy galaxy survey. At z < 0.6, the DESI Bright Galaxy Survey (BGS) will produce the most detailed map of the universe during the dark-energy-dominated epoch with redshifts of >10 million galaxies spanning 14,000 deg 2 . In this work, we present and validate the final BGS target selection and survey design. From the Legacy Surveys, BGS will target an r < 19.5 mag limited sample (BGS Bright), a fainter 19.5 < r < 20.175 color-selected sample (BGS Faint), and a smaller low- z quasar…

• NS
  National Science Foundation

  Awards: AST-2009735.836, 2009735, AST-0950945, DE-AC02-05CH11231, 0950945
• UD
  U.S. Department of Energy

  Awards: -AC02-05CH11231, 05CH11231, AC02-05CH11231, DE-AC02, DE-AC02-05CH11231, DE-AC02-
• NA
  National Aeronautics and Space Administration

  Awards: ST/T000244/1, DE-AC02-05CH11231
• GA
  Gordon and Betty Moore Foundation
• CI
  California Institute of Technology
• CA
  Chinese Academy of Sciences
• CN
  Consejo Nacional de Ciencia y Tecnología
• MD
  Ministerio de Ciencia e Innovación
• CÀ
  Commissariat à l'Énergie Atomique et aux Énergies Alternatives
• OO
  Office of Science

  Awards: AC02-05CH11231, -AC02-05CH11231, DE-AC02
• JP
  Jet Propulsion Laboratory
• SA
  Science and Technology Facilities Council

  Awards: ST/T000244, T000244, ST/T000244/1, ST/T000244/1
• DO
  Division of Astronomical Sciences

  Award: AST-0950945
• HE
  High Energy Physics

  Award: DE-AC02-05CH11231
• LB
  Lawrence Berkeley National Laboratory

  Awards: DE-AC02-05CH11231, 05CH11231, AC02-05CH11231