J/A+A/668/A27ivo://CDS.VizieR/J/A+A/668/A27doi:10.26093/cds/vizier.36680027CDSGloudemans A.J.Duncan K.J.Saxena A.Harikane Y.Hill G.J.,Zeimann G.R.Rottgering H.J.A.Yang D.Best P.N.Banados E.Drabent A.,Hardcastle M.J.Hennawi J.F.Lansbury G.Magliocchetti M.Miley G.K.,Nanni R.Shimwell T.W.Smith D.J.B.Venemans B.P.Wagenveld J.D.2023-10-06T13:58:57Z2022-11-29T09:16:53ZCDS support team

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

cds-question@unistra.frquasarsradio-galaxiesvisible-astronomyWe present the discovery of 20 new radio bright quasars (and the independent confirmation of 4) between 4.9<z<6.6. These quasars have been selected by combining an optical dropout selection driven by the g-, r-, and z-bands from the Dark Energy Spectroscopic Instrument (DESI) Legacy Imaging Surveys with low-frequency radio observations from the LOFAR Two-metre Sky Survey. Our radio detection requirement strongly decreases the contamination of stellar sources and allows for selecting these quasars in a broad redshift range. Despite selecting our quasar candidates using fewer and less conservative colour restrictions, both the optical and near-infrared colours, Ly{alpha} emission line properties, and dust reddening, E(B-V), measurements of our quasar sample do not deviate from the known radio-quiet quasar population, suggesting similar optical quasar properties of the radio-loud and radio-quiet quasar population at high-z. Our campaign demonstrates the potential for discovering new high-z quasar populations through next generation radio continuum surveys.2022A&A...668A..27Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/668/A27CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/668/A27https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/668/A27http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/668/A27https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/668/A27https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/668/A27http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/668/A27GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/668/A27/table3 (Measurements of high-z quasars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/668/A27/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/668/A27/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/668/A27/table3?GETtext/xml+votable180.050000true6.640029463325.28142182680.005555555555555556Cone search capability for table J/A+A/668/A27/list (List of fits spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/668/A27/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/668/A27/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/668/A27/list?GETtext/xml+votable180.050000true6.640029463325.28142182680.0055555555555555566/2198 5352 5537-5538 5563 5605 7189 7525 7557 7595 9039 9383 10134 10627 10720 11030 11449 11832 12756 19942 19947 19964 20047 201829.54153977050123e-26 1.987820871092403e-24https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/668/A27?format=asciiOpticalRadiodefaultJ/A+A/668/A27/table3Measurements of high-z quasarsF1.4GHz? Total flux FIRST at 1.4GHzmJyphot.flux.density;em.radio.750-1500MHzfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSimbadNameSimbad column added by the CDSmeta.idcharnullableNameSource namemeta.id;meta.maincharRAJ2000Optical right ascension Legacy Surveys DR8 (J2000.0)degpos.eq.ra;meta.mainDEJ2000Optical declination Legacy Surveys DR8 (J2000.0)degpos.eq.dec;meta.mainRALdegRight ascension from LoTSS-DR2 (J2000.0)degpos.eq.raDELdegDeclination from LoTSS-DR2 (J2000.0)degpos.eq.deczspSpectroscopic redshiftsrc.redshiftfloate_zspSpectroscopic redshift errorstat.errorfloatF144MHzTotal flux at 144MHzmJyphot.flux.density;em.radio.100-200MHzfloate_F144MHzTotal flux err at 144MHzmJystat.errorfloatL144MHzRadio luminosity at 144MHzW/Hzphys.luminosity;em.radio.100-200MHzdoublee_L144MHzRadio luminosity error at 144MHzW/Hzstat.errordoublee_F1.4GHz? Total flux error FIRST at 1.4GHzmJystat.errorfloatnullableF3GHz? Total flux VLASS at 3GHzmJyphot.flux.density;em.radio.1500-3000MHzfloatnullablee_F3GHz? Total flux error VLASS at 3GHzmJystat.errorfloatnullablealphaLF? Spectral index between 144MHz-1.4GHz (LOFAR-VLASS)spect.indexfloatnullablee_alphaLF? Spectral index error between 144MHz-1.4GHz (LOFAR-VLASS)stat.errorfloatnullablealphaFV? Spectral index between 1.4GHz-3GHz (FIRST-VLASS)spect.indexfloatnullablee_alphaFV? Spectral index error between 1.4GHz-3GHz (FIRST-VLASS)stat.errorfloatnullablealphaLV? Spectral index between 144MHz-3GHz (LOFAR-VLASS)spect.indexfloatnullablee_alphaLV? Spectral index error between 144MHz-3GHz (LOFAR-VLASS)stat.errorfloatnullableR5GHzRadio-loudness f_5GHz_/f4400{AA}phot.flux;arith.ratiofloate_R5GHzRadio-loudness errorstat.errorfloatb_LLyaLy{alpha} luminosity 16th percentile in erg/s1e-07Wphys.luminositydoubleLLyaLy{alpha} luminosity 50th percentile in erg/s1e-07Wphys.luminosity;em.UVdoubleB_LLyaLy{alpha} luminosity 84th percentile in erg/s1e-07Wphys.luminositydoubleb_EWLyaEquivalent width Ly{alpha} 16th percentile0.1nmspect.line.eqWidthfloatEWLyaEquivalent width Ly{alpha} 50th percentile0.1nmspect.line.eqWidthfloatB_EWLyaEquivalent width Ly{alpha} 84th percentile0.1nmspect.line.eqWidthfloatb_M1450Absolute magnitude at 1450{AA} 16th percentilemagphys.magAbsfloatM1450Absolute magnitude at 1450{AA} 50th percentilemagphys.magAbsfloatB_M1450Absolute magnitude at 1450{AA} 84th percentilemagphys.magAbsfloatb_M2500Absolute magnitude at 2500{AA} 16th percentilemagphys.magAbsfloatM2500Absolute magnitude at 2500{AA} 50th percentilemagphys.magAbsfloatB_M2500Absolute magnitude at 2500{AA} 84th percentilemagphys.magAbsfloatb_M4400Absolute magnitude at 4000{AA} 16th percentilemagphys.magAbsfloatM4400Absolute magnitude at 4000{AA} 50th percentilemagphys.magAbsfloatB_M4400Absolute magnitude at 4000{AA} 84th percentilemagphys.magAbsfloatJ/A+A/668/A27/listList of fits spectraNameSource namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000.0)degpos.eq.ra;meta.mainDEJ2000Declination (J2000.0)degpos.eq.dec;meta.mainObs.dateObservations date (DD-MM-YYYY)time.epoch;obsnullableInstName of instrumentmeta.id;instrcharTelName of telescopemeta.id;instr.telcharspShow the spectrummeta.ref.urlcharFileNameName of FITS spectrum in subdirectory fitsmeta.id;meta.fitschar