J/ApJS/269/27ivo://CDS.VizieR/J/ApJS/269/27doi:10.26093/cds/vizier.22690027CDSYang J.Fan X.Gupta A.Myers A.D.Palanque-Delabrouille N.Wang F.,Yeche C.Aguilar J.N.Ahlen S.Alexander D.M.Brooks D.Dawson K.,de la Macorra A.Dey A.Dhungana G.Fanning K.Font-Ribera A.,Gontcho S.Guy J.Honscheid K.Juneau S.Kisner T.Kremin A.,Le Guillou L.Levi M.Magneville C.Martini P.Meisner A.Miquel R.,Moustakas J.Nie J.Percival W.Poppett C.Prada F.Schlafly E.,Tarle G.Vargas Magana M.Weaver B.A.Wechsler R.Zhou R.Zhou Z.,Zou Hu2025-07-10T20:14:33Z2024-02-29T13:22:05ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frquasarsvisible-astronomyspectroscopysurveysredshiftedWe 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 4.8<z<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 2022 May. This sample includes more than 400 new quasars at redshift 4.7<=z<6.6, down to 21.5 magnitude (AB) 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 data set has already allowed analysis of interesting individual objects (e.g., quasars with damped Ly{alpha} 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.2023ApJS..269...27Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/269/27CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)II/367 : The VISTA Hemisphere Survey (VHS) catalog DR5 (McMahon+, 2020)VII/289 : SDSS quasar catalog, sixteenth data release (DR16Q) (Lyke+, 2020)VII/292 : DESI Legacy Imaging Surveys DR8 (Duncan, 2022)J/ApJS/197/19 : First brown dwarfs discovered by WISE (Kirkpatrick+, 2011)J/ApJ/755/89 : Metallicities of damped Ly{alpha} systems (Rafelski+, 2012)J/ApJ/746/169 : Luminosity function of broad-line quasars (Shen+, 2012)J/ApJ/764/45 : Luminosity function of broad-line quasars. II. (Kelly+, 2013)J/ApJ/792/30 : NEOWISE magnitudes for near-Earth objects (Mainzer+, 2014)J/ApJ/814/118 : L/T transition dwarfs with PS1 & WISE. II. (Best+, 2015)J/ApJS/227/11 : PS1 z>5.6 quasars follow-up (Banados+, 2016)J/ApJ/819/24 : z>4.5 QSOs with SDSS and WISE. I. Opt. spectra (Wang+, 2016)J/AJ/155/131 : z~5 QSO luminosity function from the CFHTLS (McGreer+, 2018)J/ApJ/873/35 : Gemini GNIRS NIR sp. of 50 QSOs at z>~5.7 (Shen+, 2019)J/MNRAS/494/789 : NIR and MIR photometry of known z>=5 quasars (Ross+, 2020)J/ApJ/923/262 : NIR spectroscopic obs. of z>6.5 quasars (Yang+, 2021)J/A+A/668/A27 : 24 new radio-bright quasars spectra (Gloudemans+, 2022)J/A+A/659/A1 : LOFAR Two-metre Sky Survey (LoTSS) DR2 (Shimwell+, 2022)J/ApJS/259/18 : SHELLQs. XVI. New quasars at 5.8<z<7 (Matsuoka+, 2022)J/ApJS/265/29 : PS1 z>5.6 QSO Survey. II. Quasars follow-up (Banados+, 2023)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/269/27https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/269/27http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/269/27https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/269/27https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/269/27http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/269/27GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/269/27/table1 (The 412 new quasars from our main selection)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/269/27/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/269/27/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/269/27/table1?GETtext/xml+votable180.050000true0.4485-3.879860.005555555555555556Cone search capability for table J/ApJS/269/27/table2 (The 38 new quasars from the selection during the DESI first Survey Validation (SV1) between 2020-Dec and 2021-May)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/269/27/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/269/27/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/269/27/table2?GETtext/xml+votable180.050000true87.16687-22.553830.0055555555555555566/46 138 162 178 613 665 686 767 2055 2058 2061 2080 2091 2094 2099 2110 2140 4144 4146 4153 4155 4198 4205 4211 4293 4404 4418 4752 4770 4774 4794 4843 4847 4973 5014 5018 5026 5043 5056 5103 5230 5239 5295 5315 5319 5362-5363 5407 5427 5454 5458 5825 5828 5910 5961 6174 6199 6376 6383 6414 6424 6426 6430 6432 6535 6598 6625 6684-6685 6725 6749 6874 6917 7034 7160 7231 7256 7271 7288 7564 7612 7979 7982 8061 8063 8068 8150 8156 8219 8339 8392 8400 8422 8458 8472 8529 8578 8584 8610 8625 8672 8887 8927 9075 9159 9178 9184 9192 9198 9234 9275 9288 9306 9342 9385 9401 9405 9415 9424 9453 9487 9505 9518 9535 9539 9591 9594 9634 9648 9672 9716 9729 9739 9744 9748 9774 9862 9872 9921 9985 10015 10046 10065 10200 10202 10229 10360 10372 10418 10497 10529 10541 10646 10681 10696 10733 10757-10758 10762 10780 10788 10792 10800 10868 10905 10938 11857 12315 12630 12766 13331 13354 13415 13570 14880 14884 15086 15251 15260 15308 16005 16023 16042 16857 16885 17146 17209 17251 17294 17330 17342 17393 17474 17525 17538 17704-17705 17806 17808 17880 17882 17888 17899 17939 17978 18004 18046-18047 18129 18144 18210 18229 18240 18273 18308 18321 18333 18423 18428 18505 18559 18605 18642 18649 18724 18749 18810 18848 18885 18894 18947 18950 19005 19181 19206 19222 19263 19292 19296 19301 19351 19402 19477 19499 19534 19552 19621 19653 19660-19661 19672 19716 19753 19769 19844 19899 19942 19947 20011 20018 20101 20163 20228 20230 20311-20312 20717 20719 21813 21840 21860 21956 21981 22009 22571 22575 22627-22628 22634 22643 22665 22686-22687 22697 22704 22721 22768 22782 22923 23061 23072 23075 23097 23101 23104 23106 23170 23175 23195 25503 25541 25551 25559 25566 25582 25874-25875 25888 25890 25908 25917 25972 26041 26105 26127 26159 26175 26181 26214 26248 26256 26273 26292 26311 26376 26400 26743 26857 26859 26867 26897 26920 26922 26926 26942-26943 26969 26982 27002 27037 27046 27085 27110 27115 27122 27147 27150 27169 27192 27203 27206 27215 27269 27287 27309 27314 27320 27322 27333 27339 27344 27350 27358 27360-27361 27381 27417-27418 27423 27430 27448 27490 27498 27506 27569 27587 27612 27698 27715 27782 27871 28035 28148 28199 28467 28475 28478 28561 28593 28637 28641 28645 31142 31203 31206 31336 31431-31432 31441 31456 31477 31534 31550 31592 31616 31620 31682 31690 31717 31724 32454 32470 32668 32679 32745 36217 36350 36532 36623 36660 36688 36749 36780 36787 36812 36825 36835 36846 40907-40908 40926 40945 44922 45005 45012 45051 45054 49128 49132https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/269/27?format=asciiOpticaldefaultJ/ApJS/269/27/table1The 412 new quasars from our main selectionrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDESIQuasar name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharf_DESI[bc ] Flag on DESI (1)meta.codecharRAJ2000Right Acsension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainz[4.4/6.6] Redshift (G1)src.redshiftfloatzmag[18.9/21.5] Apparent z-band magnitude from Legacy Surveysmagphot.mag;em.opt.Ifloate_zmag[0.004/0.08] Uncertainty on zmagmagstat.error;phot.magfloatDR8Display data from DESI Legacy Surveys DR8 (VII/292) within 0.3"meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJS/269/27/table2The 38 new quasars from the selection during the DESI first Survey Validation (SV1) between 2020-Dec and 2021-MayrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDESIQuasar name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainz[3.8/5.8] Redshift (G1)src.redshiftfloatzmag[18/21.4] Apparent z-band magnitude from Legacy Surveysmagphot.mag;em.opt.Ifloate_zmag[0.002/0.05] Uncertainty on zmagmagstat.error;phot.magfloatDR8Display data from DESI Legacy Surveys DR8 (VII/292) within 0.3"meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar