Target Selection and Validation of DESI Emission Line Galaxies
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 o...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astronomical Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/1538-3881/acb213 |
| _version_ | 1827830940417654784 |
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| author | 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 |
| author_facet | 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 |
| author_sort | A. Raichoor |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-12T04:36:58Z |
| format | Article |
| id | doaj.art-644aa4d188fd4ed987e08402f4db4c33 |
| institution | Directory Open Access Journal |
| issn | 1538-3881 |
| language | English |
| last_indexed | 2024-03-12T04:36:58Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astronomical Journal |
| spelling | doaj.art-644aa4d188fd4ed987e08402f4db4c332023-09-03T09:55:17ZengIOP PublishingThe Astronomical Journal1538-38812023-01-01165312610.3847/1538-3881/acb213Target Selection and Validation of DESI Emission Line GalaxiesA. Raichoor0https://orcid.org/0000-0001-5999-7923J. Moustakas1https://orcid.org/0000-0002-2733-4559Jeffrey A. Newman2https://orcid.org/0000-0001-8684-2222T. Karim3https://orcid.org/0000-0002-5652-8870S. Ahlen4https://orcid.org/0000-0001-6098-7247Shadab Alam5https://orcid.org/0000-0002-3757-6359S. Bailey6https://orcid.org/0000-0003-4162-6619D. Brooks7https://orcid.org/0000-0002-8458-5047K. Dawson8https://orcid.org/0000-0002-0553-3805A. de la Macorra9A. de Mattia10A. Dey11https://orcid.org/0000-0002-4928-4003Biprateep Dey12https://orcid.org/0000-0002-5665-7912G. Dhungana13https://orcid.org/0000-0002-5402-1216S. Eftekharzadeh14D. J. Eisenstein15https://orcid.org/0000-0002-2929-3121K. Fanning16A. Font-Ribera17https://orcid.org/0000-0002-3033-7312J. García-Bellido18https://orcid.org/0000-0002-9370-8360E. Gaztañaga19https://orcid.org/0000-0001-9632-0815S. Gontcho A Gontcho20https://orcid.org/0000-0003-3142-233XJ. Guy21https://orcid.org/0000-0001-9822-6793K. Honscheid22M. Ishak23https://orcid.org/0000-0002-6024-466XR. Kehoe24https://orcid.org/0000-0002-7101-697XT. Kisner25https://orcid.org/0000-0003-3510-7134Anthony Kremin26https://orcid.org/0000-0001-6356-7424Ting-Wen Lan27https://orcid.org/0000-0001-8857-7020M. Landriau28https://orcid.org/0000-0003-1838-8528L. Le Guillou29https://orcid.org/0000-0001-7178-8868Michael E. Levi30https://orcid.org/0000-0003-1887-1018C. Magneville31M. Manera32P. Martini33https://orcid.org/0000-0002-4279-4182Aaron M. Meisner34https://orcid.org/0000-0002-1125-7384Adam D. Myers35Jundan Nie36https://orcid.org/0000-0001-6590-8122N. Palanque-Delabrouille37https://orcid.org/0000-0003-3188-784XW. J. Percival38https://orcid.org/0000-0002-0644-5727C. Poppett39F. Prada40https://orcid.org/0000-0001-7145-8674A. J. Ross41V. Ruhlmann-Kleider42C. G. Sabiu43https://orcid.org/0000-0002-5513-5303E. F. Schlafly44https://orcid.org/0000-0002-3569-7421D. Schlegel45https://orcid.org/0000-0002-5042-5088Gregory Tarlé46https://orcid.org/0000-0003-1704-0781B. A. Weaver47Christophe Yèche48https://orcid.org/0000-0001-5146-8533Rongpu Zhou49https://orcid.org/0000-0001-5381-4372Zhimin Zhou50https://orcid.org/0000-0002-4135-0977H. Zou51https://orcid.org/0000-0002-6684-3997Lawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA ; araichoor@lbl.govDepartment of Physics and Astronomy, Siena College , 515 Loudon Road, Loudonville, NY 12211, USADepartment of Physics & Astronomy and Pittsburgh Particle Physics, Astrophysics, and Cosmology Center (PITT PACC), University of Pittsburgh , 3941 O’Hara Street, Pittsburgh, PA 15260, USACenter for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USAPhysics Dept., Boston University , 590 Commonwealth Avenue, Boston, MA 02215, USAInstitute for Astronomy, University of Edinburgh , Royal Observatory, Blackford Hill, Edinburgh, EH9 3HJ, UKLawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA ; araichoor@lbl.govDepartment of Physics & Astronomy, University College London , Gower Street, London, WC1E 6BT, UKDepartment of Physics and Astronomy, The University of Utah , 115 South 1400 East, Salt Lake City, UT 84112, USAInstituto de Física, Universidad Nacional Autónoma de México , Cd. de México C.P. 04510, MéxicoIRFU, CEA, Université Paris-Saclay , F-91191 Gif-sur-Yvette, FranceNSF's NOIRLab , 950 N. Cherry Ave., Tucson, AZ 85719, USADepartment of Physics & Astronomy and Pittsburgh Particle Physics, Astrophysics, and Cosmology Center (PITT PACC), University of Pittsburgh , 3941 O’Hara Street, Pittsburgh, PA 15260, USADepartment of Physics, Southern Methodist University , 3215 Daniel Avenue, Dallas, TX 75275, USAUniversities Space Research Association , NASA Ames Research Centre, USACenter for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USADepartment 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, USAInstitut de Física d’Altes Energies (IFAE) , The Barcelona Institute of Science and Technology, Campus UAB, E-08193 Bellaterra, Barcelona, SpainInstituto de Física Teórica (IFT) UAM/CSIC, Universidad Autónoma de Madrid , Cantoblanco, E-28049, Madrid, SpainInstitut 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, SpainLawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA ; araichoor@lbl.govLawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA ; araichoor@lbl.govDepartment 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, USADepartment of Physics, The University of Texas at Dallas , Richardson, TX 75080, USADepartment of Physics, Southern Methodist University , 3215 Daniel Avenue, Dallas, TX 75275, USALawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA ; araichoor@lbl.govLawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA ; araichoor@lbl.govGraduate Institute of Astrophysics and Department of Physics, National Taiwan University , No. 1, Sec. 4, Roosevelt Road, Taipei 10617, TaiwanLawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA ; araichoor@lbl.govSorbonne Université , CNRS/IN2P3, Laboratoire de Physique Nucléaire et de Hautes Energies (LPNHE), F-75005 Paris, FranceLawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA ; araichoor@lbl.govIRFU, CEA, Université Paris-Saclay , F-91191 Gif-sur-Yvette, FranceInstitut 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, SpainCenter 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, USANSF's NOIRLab , 950 N. Cherry Ave., Tucson, AZ 85719, USADepartment of Physics & Astronomy, University of Wyoming , 1000 E. University, Dept. 3905, Laramie, WY 82071, USANational Astronomical Observatories, Chinese Academy of Sciences , A20 Datun Road, Chaoyang District, Beijing, 100012, People’s Republic of ChinaLawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA ; araichoor@lbl.gov; IRFU, CEA, Université Paris-Saclay , F-91191 Gif-sur-Yvette, FranceDepartment 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, CanadaLawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA ; araichoor@lbl.gov; 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, USAInstituto de Astrofísica de Andalucía (CSIC) , Glorieta de la Astronomía, s/n, E-18008 Granada, SpainCenter for Cosmology and AstroParticle Physics, The Ohio State University , 191 West Woodruff Avenue, Columbus, OH 43210, USAIRFU, CEA, Université Paris-Saclay , F-91191 Gif-sur-Yvette, FranceNatural Science Research Institute, University of Seoul , 163 Seoulsiripdae-ro, Dongdaemun-gu, Seoul, Republic of KoreaSpace Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USALawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA ; araichoor@lbl.govUniversity of Michigan , Ann Arbor, MI 48109, USANSF's NOIRLab , 950 N. Cherry Ave., Tucson, AZ 85719, USAIRFU, CEA, Université Paris-Saclay , F-91191 Gif-sur-Yvette, FranceLawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA ; araichoor@lbl.govNational Astronomical Observatories, Chinese Academy of Sciences , A20 Datun Road, Chaoyang District, Beijing, 100012, People’s Republic of ChinaNational Astronomical Observatories, Chinese Academy of Sciences , A20 Datun Road, Chaoyang District, Beijing, 100012, People’s Republic of ChinaThe 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.https://doi.org/10.3847/1538-3881/acb213Emission line galaxiesSurveysLarge-scale structure of the universe |
| spellingShingle | 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 Target Selection and Validation of DESI Emission Line Galaxies The Astronomical Journal Emission line galaxies Surveys Large-scale structure of the universe |
| title | Target Selection and Validation of DESI Emission Line Galaxies |
| title_full | Target Selection and Validation of DESI Emission Line Galaxies |
| title_fullStr | Target Selection and Validation of DESI Emission Line Galaxies |
| title_full_unstemmed | Target Selection and Validation of DESI Emission Line Galaxies |
| title_short | Target Selection and Validation of DESI Emission Line Galaxies |
| title_sort | target selection and validation of desi emission line galaxies |
| topic | Emission line galaxies Surveys Large-scale structure of the universe |
| url | https://doi.org/10.3847/1538-3881/acb213 |
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