The Astronomical Journal (Jan 2023)
Target Selection and Validation of DESI Emission Line Galaxies
- A. Raichoor,
- J. Moustakas,
- Jeffrey A. Newman,
- T. Karim,
- S. Ahlen,
- Shadab Alam,
- S. Bailey,
- D. Brooks,
- K. Dawson,
- A. de la Macorra,
- A. de Mattia,
- A. Dey,
- Biprateep Dey,
- G. Dhungana,
- S. Eftekharzadeh,
- D. J. Eisenstein,
- K. Fanning,
- A. Font-Ribera,
- J. García-Bellido,
- E. Gaztañaga,
- S. Gontcho A Gontcho,
- J. Guy,
- K. Honscheid,
- M. Ishak,
- R. Kehoe,
- T. Kisner,
- Anthony Kremin,
- Ting-Wen Lan,
- M. Landriau,
- L. Le Guillou,
- Michael E. Levi,
- C. Magneville,
- M. Manera,
- P. Martini,
- Aaron M. Meisner,
- Adam D. Myers,
- Jundan Nie,
- N. Palanque-Delabrouille,
- W. J. Percival,
- C. Poppett,
- F. Prada,
- A. J. Ross,
- V. Ruhlmann-Kleider,
- C. G. Sabiu,
- E. F. Schlafly,
- D. Schlegel,
- Gregory Tarlé,
- B. A. Weaver,
- Christophe Yèche,
- Rongpu Zhou,
- Zhimin Zhou,
- H. Zou
Affiliations
- A. Raichoor
- ORCiD
- Lawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA ; [email protected]
- J. Moustakas
- ORCiD
- Department of Physics and Astronomy, Siena College , 515 Loudon Road, Loudonville, NY 12211, USA
- Jeffrey A. Newman
- ORCiD
- Department of Physics & Astronomy and Pittsburgh Particle Physics, Astrophysics, and Cosmology Center (PITT PACC), University of Pittsburgh , 3941 O’Hara Street, Pittsburgh, PA 15260, USA
- T. Karim
- ORCiD
- Center for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA
- S. Ahlen
- ORCiD
- Physics Dept., Boston University , 590 Commonwealth Avenue, Boston, MA 02215, USA
- Shadab Alam
- ORCiD
- Institute for Astronomy, University of Edinburgh , Royal Observatory, Blackford Hill, Edinburgh, EH9 3HJ, UK
- S. Bailey
- ORCiD
- Lawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA ; [email protected]
- D. Brooks
- ORCiD
- Department of Physics & Astronomy, University College London , Gower Street, London, WC1E 6BT, UK
- K. Dawson
- ORCiD
- Department of Physics and Astronomy, The University of Utah , 115 South 1400 East, Salt Lake City, UT 84112, USA
- A. de la Macorra
- Instituto de Física, Universidad Nacional Autónoma de México , Cd. de México C.P. 04510, México
- A. de Mattia
- IRFU, CEA, Université Paris-Saclay , F-91191 Gif-sur-Yvette, France
- A. Dey
- ORCiD
- NSF's NOIRLab , 950 N. Cherry Ave., Tucson, AZ 85719, USA
- Biprateep Dey
- ORCiD
- Department of Physics & Astronomy and Pittsburgh Particle Physics, Astrophysics, and Cosmology Center (PITT PACC), University of Pittsburgh , 3941 O’Hara Street, Pittsburgh, PA 15260, USA
- G. Dhungana
- ORCiD
- Department of Physics, Southern Methodist University , 3215 Daniel Avenue, Dallas, TX 75275, USA
- S. Eftekharzadeh
- Universities Space Research Association , NASA Ames Research Centre, USA
- D. J. Eisenstein
- ORCiD
- Center for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA
- K. Fanning
- Department of Physics, The Ohio State University , 191 West Woodruff Avenue, Columbus, OH 43210, USA; Center for Cosmology and AstroParticle Physics, The Ohio State University , 191 West Woodruff Avenue, Columbus, OH 43210, USA
- A. Font-Ribera
- ORCiD
- Institut de Física d’Altes Energies (IFAE) , The Barcelona Institute of Science and Technology, Campus UAB, E-08193 Bellaterra, Barcelona, Spain
- J. García-Bellido
- ORCiD
- Instituto de Física Teórica (IFT) UAM/CSIC, Universidad Autónoma de Madrid , Cantoblanco, E-28049, Madrid, Spain
- E. Gaztañaga
- ORCiD
- Institut d’Estudis Espacials de Catalunya (IEEC) , E-08034 Barcelona, Spain; Institute of Space Sciences , ICE-CSIC, Campus UAB, Carrer de Can Magrans s/n, E-08913 Bellaterra, Barcelona, Spain
- S. Gontcho A Gontcho
- ORCiD
- Lawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA ; [email protected]
- J. Guy
- ORCiD
- Lawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA ; [email protected]
- K. Honscheid
- Department of Physics, The Ohio State University , 191 West Woodruff Avenue, Columbus, OH 43210, USA; Center for Cosmology and AstroParticle Physics, The Ohio State University , 191 West Woodruff Avenue, Columbus, OH 43210, USA
- M. Ishak
- ORCiD
- Department of Physics, The University of Texas at Dallas , Richardson, TX 75080, USA
- R. Kehoe
- ORCiD
- Department of Physics, Southern Methodist University , 3215 Daniel Avenue, Dallas, TX 75275, USA
- T. Kisner
- ORCiD
- Lawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA ; [email protected]
- Anthony Kremin
- ORCiD
- Lawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA ; [email protected]
- Ting-Wen Lan
- ORCiD
- Graduate Institute of Astrophysics and Department of Physics, National Taiwan University , No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan
- M. Landriau
- ORCiD
- Lawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA ; [email protected]
- L. Le Guillou
- ORCiD
- Sorbonne Université , CNRS/IN2P3, Laboratoire de Physique Nucléaire et de Hautes Energies (LPNHE), F-75005 Paris, France
- Michael E. Levi
- ORCiD
- Lawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA ; [email protected]
- C. Magneville
- IRFU, CEA, Université Paris-Saclay , F-91191 Gif-sur-Yvette, France
- M. Manera
- Institut de Física d’Altes Energies (IFAE) , The Barcelona Institute of Science and Technology, Campus UAB, E-08193 Bellaterra, Barcelona, Spain; ISerra Húnter Fellow, Departament de Física, Universitat Auònoma de Barcelona , Bellaterra, Spain
- P. Martini
- ORCiD
- Center for Cosmology and AstroParticle Physics, The Ohio State University , 191 West Woodruff Avenue, Columbus, OH 43210, USA; Department of Astronomy, The Ohio State University , 4055 McPherson Laboratory, 140 W 18th Avenue, Columbus, OH 43210, USA
- Aaron M. Meisner
- ORCiD
- NSF's NOIRLab , 950 N. Cherry Ave., Tucson, AZ 85719, USA
- Adam D. Myers
- Department of Physics & Astronomy, University of Wyoming , 1000 E. University, Dept. 3905, Laramie, WY 82071, USA
- Jundan Nie
- ORCiD
- National Astronomical Observatories, Chinese Academy of Sciences , A20 Datun Road, Chaoyang District, Beijing, 100012, People’s Republic of China
- N. Palanque-Delabrouille
- ORCiD
- Lawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA ; [email protected]; IRFU, CEA, Université Paris-Saclay , F-91191 Gif-sur-Yvette, France
- W. J. Percival
- ORCiD
- Department of Physics and Astronomy, University of Waterloo , 200 University Avenue W, Waterloo, ON N2L 3G1, Canada; Perimeter Institute for Theoretical Physics , 31 Caroline Street North, Waterloo, ON N2L 2Y5, Canada; Waterloo Centre for Astrophysics, University of Waterloo , 200 University Avenue W, Waterloo, ON N2L 3G1, Canada
- C. Poppett
- Lawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA ; [email protected]; Space Sciences Laboratory, University of California , Berkeley, 7 Gauss Way, Berkeley, CA 94720, USA; University of California , Berkeley, 110 Sproul Hall #5800 Berkeley, CA 94720, USA
- F. Prada
- ORCiD
- Instituto de Astrofísica de Andalucía (CSIC) , Glorieta de la Astronomía, s/n, E-18008 Granada, Spain
- A. J. Ross
- Center for Cosmology and AstroParticle Physics, The Ohio State University , 191 West Woodruff Avenue, Columbus, OH 43210, USA
- V. Ruhlmann-Kleider
- IRFU, CEA, Université Paris-Saclay , F-91191 Gif-sur-Yvette, France
- C. G. Sabiu
- ORCiD
- Natural Science Research Institute, University of Seoul , 163 Seoulsiripdae-ro, Dongdaemun-gu, Seoul, Republic of Korea
- E. F. Schlafly
- ORCiD
- Space Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA
- D. Schlegel
- ORCiD
- Lawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA ; [email protected]
- Gregory Tarlé
- ORCiD
- University of Michigan , Ann Arbor, MI 48109, USA
- B. A. Weaver
- NSF's NOIRLab , 950 N. Cherry Ave., Tucson, AZ 85719, USA
- Christophe Yèche
- ORCiD
- IRFU, CEA, Université Paris-Saclay , F-91191 Gif-sur-Yvette, France
- Rongpu Zhou
- ORCiD
- Lawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA ; [email protected]
- Zhimin Zhou
- ORCiD
- National Astronomical Observatories, Chinese Academy of Sciences , A20 Datun Road, Chaoyang District, Beijing, 100012, People’s Republic of China
- H. Zou
- ORCiD
- National Astronomical Observatories, Chinese Academy of Sciences , A20 Datun Road, Chaoyang District, Beijing, 100012, People’s Republic of China
- DOI
- https://doi.org/10.3847/1538-3881/acb213
- Journal volume & issue
-
Vol. 165,
no. 3
p. 126
Abstract
The Dark Energy Spectroscopic Instrument (DESI) will precisely constrain cosmic expansion and the growth of structure by collecting ∼40 million extragalactic redshifts across ∼80% of cosmic history and one-third of the sky. The Emission Line galaxy (ELG) sample, which will comprise about one-third of all DESI tracers, will be used to probe the universe over the 0.6 < z < 1.6 range, including the 1.1 < z < 1.6 range, which is expected to provide the tightest constraints. We present the target selection for the DESI Survey Validation (SV) and Main Survey ELG samples, which relies on the imaging of the Legacy Surveys. The Main ELG selection consists of a g -band magnitude cut and a ( g − r ) versus ( r − z ) color box, while the SV selection explores extensions of the Main selection boundaries. The Main ELG sample is composed of two disjoint subsamples, which have target densities of about 1940 deg ^−2 and 460 deg ^−2 , respectively. We first characterize their photometric properties and density variations across the footprint. We then analyze the DESI spectroscopic data that have been obtained from 2020 December to 2021 December in the SV and Main Survey. We establish a preliminary criterion for selecting reliable redshifts, based on the [O ii ] flux measurement, and assess its performance. Using this criterion, we are able to present the spectroscopic efficiency of the Main ELG selection, along with its redshift distribution. We thus demonstrate that the Main selection 1940 deg ^−2 subsample alone should provide 400 deg ^−2 and 460 deg ^−2 reliable redshifts in the 0.6 < z < 1.1 and the 1.1 < z < 1.6 ranges, respectively.
Keywords