J/ApJS/250/26ivo://CDS.VizieR/J/ApJS/250/26doi:10.26093/cds/vizier.22500026CDSBoutsia K.Grazian A.Calderone G.Cristiani S.Cupani G.Guarneri F.,Fontanot F.Amorin R.D'Odorico V.Giallongo E.Salvato M.Omizzolo A.,Romano M.Menci N.2022-09-05T13:52:04Z2021-02-19T07:10:35ZCDS support team

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

cds-question@unistra.frquasarsvisible-astronomyspectroscopyredshiftedinfrared-photometryphotometryactive-galactic-nucleisurveysWe present the results of the spectroscopic follow-up of the QUasars as BRIght beacons for Cosmology in the Southern Hemisphere (QUBRICS; Calderone+ 2019, J/ApJ/887/268) survey. The selection method is based on a machine-learning approach applied to photometric catalogs, covering an area of ~12400deg^2^ in the Southern Hemisphere. The spectroscopic observations started in 2018 and identified 55 new, high-redshift (z>=2.5), bright (i<=18) quasi-stellar objects (QSOs), with the catalog published in late 2019. Here we report the current status of the survey, bringing the total number of bright QSOs at z>=2.5 identified by QUBRICS to 224. The success rate of the QUBRICS selection method, in its most recent training, is estimated to be 68%. The predominant contaminant turns out to be lower-z QSOs at z<2.5. This survey provides a unique sample of bright QSOs at high z available for a number of cosmological investigations. In particular, carrying out the redshift drift measurements (Sandage Test) in the Southern Hemisphere, using the High Resolution Spectrograph at the 39m Extremely Large Telescope appears to be possible with less than 2500hr of observations spread over 30 targets in 25yr.2020ApJS..250...26Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/250/26CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/335 : Revised cat. of GALEX UV sources (GUVcat_AIS GR6+7) (Bianchi+ 2017)I/345 : Gaia DR2 (Gaia Collaboration, 2018)II/358 : SkyMapper Southern Sky Survey. DR1.1 (Wolf+, 2018)VII/250 : The 2dF Galaxy Redshift Survey (2dFGRS) (2dFGRS Team, 1998-2003)VII/259 : 6dF galaxy survey final redshift release (Jones+, 2009)VII/258 : Quasars and Active Galactic Nuclei (13th Ed.) (Veron+ 2010)VII/286 : SDSS quasar catalog, fourteenth data release (Paris+, 2018)J/AJ/144/49 : Quasars from SDSS-DR7, WISE and UKIDSS surveys (Wu+, 2012)J/MNRAS/445/1745 : Giant Gemini GMOS survey. I. (Worseck+, 2014)J/ApJ/819/24 : z>4.5 QSOs with SDSS and WISE. I. Opt. spectra (Wang+, 2016)J/MNRAS/465/4914 : R-band light curves of HE 0435-1223 (Bonvin+, 2017)J/AJ/153/107 : Australian Dark Energy Survey (OzDES) QSO cat. (Tie+, 2017)J/ApJS/243/5 : The ELQS in the PS1 footprint (PS-ELQS) (Schindler+, 2019)J/ApJ/871/258 : ELQS in SDSS. III. Full ELQS quasar cat. (Schindler+, 2019)J/ApJ/887/268 : QSOs in the Southern Hemisphere (QUBRICS) (Calderone+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/250/26https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/250/26http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/250/26https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/250/26https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/250/26http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/250/26GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/250/26/table1 (All observed sources with secure redshift identification)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/250/26/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/250/26/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/250/26/table1?GETtext/xml+votable180.050000true315.3946667-30.17493060.005555555555555556Cone search capability for table J/ApJS/250/26/table2 (Additional identifications from the literature)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/250/26/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/250/26/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/250/26/table2?GETtext/xml+votable180.050000true10.8475833-0.26458330.005555555555555556Cone search capability for table J/ApJS/250/26/table3 (The Golden Southern QSOs for the Sandage Test)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/250/26/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/250/26/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/250/26/table3?GETtext/xml+votable180.050000true0.84563889-26.055083060.0055555555555555566/4137 16413 16435 16589 16638 16699 16742 16753 16784 16791 16847 16853 16880 16892 16987 17014 17028 17031 17083 17141 17148 17167 17246 17314 17388 17412 17439 17462 17495 17525 17538 17558 17653 17710 17948 17992 18069 18446 18577 18583 18874 18958 18975 18978 20493 20538 20632 21030 21068 21102 21161 21164 21184 21200 21820 22604 22611 22656 22696 22733 22756 22781 22794 22827 22831 22922 22953 23110 23174 23185 23193 24661 24785 24790 24856 25065 25102 25166 25270 25273 25281 25415 25545 25709 25800 25824 25827 26258 26648 26651 26664 26701 26748 26757 26808 26810 26931 27140 27146 27163 27172 27175 27186 27189 27195 27206 30023 31313 32845 32854 32887 32894 32900 32949 32997 33006 33038 33117 33131 33173 33353 33366 33398 33429 33511 33543 33567 33577 33588 33615 33746 33759 33806 33853 33858 33866 33898 33931 33965 33967 33972 33974 33982 34036 34046 34067 34072 34087 34092 34102 34113 34122 34141 34171 34197 34207 34277 34294 34331 34337 34343 34361 34366 34409 34444 34455 34469 34483 34546 34554 34570 34576 34588 34605 34618 34620 34646 34669 34688 34711 34720 34729 34741 34754 34760 34777 34782 34832 34843 34884 34905 34954 34988 35006 35322 35363 35419 35488 35516 35657 35711 35793 35826 35887 35902 35917 35960 35969 35993 35995 36103 36107 36114 36117 36122 36134 36165 36281 36290 36345 36359 36391 36461 36500 36502 36506 36557 36568 36632 36635 36669 36674 36677 36699 36741 36758 37383 37389 37517 38741 38744 38775 38907 38926 39073 39076 39082 39430 39586 40256 40272 40296 40396 40446 40773 40953 43498 43733 43902 44285 44437 44552 44565 44847 45187 45206 45258 45269 45283 45336 45349 45357 45359 45366 45415 45441 45479-45480 45575 45647 45791 45831 45858 45870 45889 45918 45933 45991 45999 46001 46031 46036 46080 46108 46113 46125 46147 46199 46286 46349 46466 46471 46525 46561 46570 46603 46636 46646 46661 46746 46803 46840 46942 47214 47412 47430 47442-47443 47507 47517 47532 47548 47558 47576 47603 47941 48175 48186 48222 48234 48357 48367 48388 48430 48494 48566 48610 48641 48644 48646 48654 48704 48720 48765 48839 48923 491091.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/250/26?format=asciiOpticalInfrareddefaultJ/ApJS/250/26/table1All observed sources with secure redshift identificationID[107306/318699655] Skymapper identifiermeta.id;meta.mainlongSimbadNameSimbad column added by the CDSmeta.idcharnullablef_IDFlag on ID (1)meta.codecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainimag[14.6/18.4] Apparent i band AB magnitudemagphot.mag;em.opt.Ifloatzspec[0/4.8] Spectroscopic redshiftsrc.redshiftfloatClassClass ("QSO": 251 occurrences; "AGN": 25 occurrences; "GAL": 9 occurrences or "STAR": 18 occurrences)src.classcharPapICandidate in Paper I (Calderone+ 2019ApJ...887..268C ; yes: 259 occurrences) (2)meta.codecharNewCandidate with new training set (yes:205 occurrences) (2)meta.codecharObs[2018/2020] Year of the observationtime.epochObs2? Month for the second observationtime.epochintnullableInstInstrument code(s) (3)meta.code;instrcharJ/ApJS/250/26/table2Additional identifications from the literatureSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[1459087/318330107] Skymapper identifiermeta.id;meta.mainlongRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainimag[15.1/18] i-band AB magnitudemagphot.mag;em.opt.Ifloatzsp[0.2/3.13] Spectroscopic redshiftsrc.redshiftfloatClassObject class ("QSO" or "AGN")meta.code.classcharSurveySurvey identifier (1)meta.idchar6dFDisplay the 6dF galaxy survey (VII/259) within 3"meta.ref.urlcharJ/ApJS/250/26/table3The Golden Southern QSOs for the Sandage TestSimbadNameSimbad column added by the CDSmeta.idcharnullablet22.5[39.9/99.4] Total time required to carry out the Sandage Test (velocity accuracy of 22.5cm/s)htime.epochfloatID[397340/318204033] Skymapper identifiermeta.id;meta.mainlongC19Display data from Paper I (Calderone+, 2019, J/ApJ/887/268)meta.ref.urlintnullableGaiaDisplay the Gaia DR2 data (I/345) within 3"meta.ref.urlcharSMSSSkyMapper name of the source (JHHMMSS.ss+DDMMSS.s)meta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-69.4/-0.7] Declination (J2000)degpos.eq.dec;meta.mainrmag[16.6/18.1]? r-band AB magnitudemagphot.mag;em.opt.Rfloatnullableimag[16.3/17.5] i-band AB magnitudemagphot.mag;em.opt.IfloatGmag[16.5/18.6] Gaia G-band magnitudemagphot.mag;em.optfloatz[2.8/4.8] Redshiftsrc.redshiftfloatf_rmag[*] * : no value of rmagmeta.codechar