DESI z >~ 5 Quasar Survey. I. A First Sample of 400 New Quasars at z ~ 4.7-6.6
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2023
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| author | Yang, Jinyi Fan, Xiaohui Gupta, Ansh Myers, Adam Palanque-Delabrouille, Nathalie Wang, Feige Yèche, Christophe Aguilar, Jessica Nicole Ahlen, Steven Alexander, David Brooks, David Dawson, Kyle de la Macorra, Axel Dey, Arjun Dhungana, Govinda Fanning, Kevin Font-Ribera, Andreu Gontcho, Satya Guy, Julien Honscheid, Klaus Juneau, Stephanie Kisner, Theodore Kremin, Anthony Guillou, Laurent Le Levi, Michael Magneville, Christophe Martini, Paul Meisner, Aaron Miquel, Ramon Moustakas, John Nie, Jundan Percival, Will Poppett, Claire Prada, Francisco Schlafly, Edward Tarlé, Gregory Magana, Mariana Vargas Weaver, Benjamin Alan Wechsler, Risa Zhou, Rongpu Zhou, Zhimin Zou, Hu |
| author_facet | Yang, Jinyi Fan, Xiaohui Gupta, Ansh Myers, Adam Palanque-Delabrouille, Nathalie Wang, Feige Yèche, Christophe Aguilar, Jessica Nicole Ahlen, Steven Alexander, David Brooks, David Dawson, Kyle de la Macorra, Axel Dey, Arjun Dhungana, Govinda Fanning, Kevin Font-Ribera, Andreu Gontcho, Satya Guy, Julien Honscheid, Klaus Juneau, Stephanie Kisner, Theodore Kremin, Anthony Guillou, Laurent Le Levi, Michael Magneville, Christophe Martini, Paul Meisner, Aaron Miquel, Ramon Moustakas, John Nie, Jundan Percival, Will Poppett, Claire Prada, Francisco Schlafly, Edward Tarlé, Gregory Magana, Mariana Vargas Weaver, Benjamin Alan Wechsler, Risa Zhou, Rongpu Zhou, Zhimin Zou, Hu |
| contents | We report the first results of a high-redshift ($z$ >~ 5) quasar survey using the Dark Energy Spectroscopic Instrument (DESI). As a DESI secondary target program, this survey is designed to carry out a systematic search and investigation of quasars at $z$ >~ 5, up to redshift 6.8. The target selection is based on the DESI Legacy Imaging Surveys (the Legacy Surveys) DR9 photometry, combined with the Pan-STARRS1 data and $J$-band photometry from public surveys. A first quasar sample has been constructed from the DESI Survey Validation 3 (SV3) and first-year observations until May 2022. This sample includes more than 400 new quasars at redshift 4.7 <= $z$ < 6.6, down to 21.5 magnitude in the $z$ band, discovered from 35% of the entire target sample. Remarkably, there are 220 new quasars identified at $z$ >= 5, more than one third of existing quasars previously published at this redshift. The observations so far result in an average success rate of 23% at $z$ > 4.7. The current spectral dataset has already allowed analysis of interesting individual objects (e.g., quasars with damped Ly$α$ absorbers and broad absorption line features), and statistical analysis will follow the survey's completion. A set of science projects will be carried out leveraging this program, including quasar luminosity function, quasar clustering, intergalactic medium, quasar spectral properties, intervening absorbers, and properties of early supermassive black holes. Additionally, a sample of 38 new quasars at $z$ ~ 3.8-5.7 discovered from a pilot survey in the DESI SV1 is also published in this paper. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2302_01777 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | DESI z >~ 5 Quasar Survey. I. A First Sample of 400 New Quasars at z ~ 4.7-6.6 Yang, Jinyi Fan, Xiaohui Gupta, Ansh Myers, Adam Palanque-Delabrouille, Nathalie Wang, Feige Yèche, Christophe Aguilar, Jessica Nicole Ahlen, Steven Alexander, David Brooks, David Dawson, Kyle de la Macorra, Axel Dey, Arjun Dhungana, Govinda Fanning, Kevin Font-Ribera, Andreu Gontcho, Satya Guy, Julien Honscheid, Klaus Juneau, Stephanie Kisner, Theodore Kremin, Anthony Guillou, Laurent Le Levi, Michael Magneville, Christophe Martini, Paul Meisner, Aaron Miquel, Ramon Moustakas, John Nie, Jundan Percival, Will Poppett, Claire Prada, Francisco Schlafly, Edward Tarlé, Gregory Magana, Mariana Vargas Weaver, Benjamin Alan Wechsler, Risa Zhou, Rongpu Zhou, Zhimin Zou, Hu Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics We report the first results of a high-redshift ($z$ >~ 5) quasar survey using the Dark Energy Spectroscopic Instrument (DESI). As a DESI secondary target program, this survey is designed to carry out a systematic search and investigation of quasars at $z$ >~ 5, up to redshift 6.8. The target selection is based on the DESI Legacy Imaging Surveys (the Legacy Surveys) DR9 photometry, combined with the Pan-STARRS1 data and $J$-band photometry from public surveys. A first quasar sample has been constructed from the DESI Survey Validation 3 (SV3) and first-year observations until May 2022. This sample includes more than 400 new quasars at redshift 4.7 <= $z$ < 6.6, down to 21.5 magnitude in the $z$ band, discovered from 35% of the entire target sample. Remarkably, there are 220 new quasars identified at $z$ >= 5, more than one third of existing quasars previously published at this redshift. The observations so far result in an average success rate of 23% at $z$ > 4.7. The current spectral dataset has already allowed analysis of interesting individual objects (e.g., quasars with damped Ly$α$ absorbers and broad absorption line features), and statistical analysis will follow the survey's completion. A set of science projects will be carried out leveraging this program, including quasar luminosity function, quasar clustering, intergalactic medium, quasar spectral properties, intervening absorbers, and properties of early supermassive black holes. Additionally, a sample of 38 new quasars at $z$ ~ 3.8-5.7 discovered from a pilot survey in the DESI SV1 is also published in this paper. |
| title | DESI z >~ 5 Quasar Survey. I. A First Sample of 400 New Quasars at z ~ 4.7-6.6 |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2302.01777 |