J/ApJS/264/9ivo://CDS.VizieR/J/ApJS/264/9doi:10.26093/cds/vizier.22640009CDSYang Q.Shen Y.2023-07-03T14:24:06Z2023-04-14T14:52:05ZCDS support team

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

cds-question@unistra.frquasarssurveysinfrared-photometryvisible-astronomybroad-band-photometryredshiftedWe present a catalog of 1.4 million photometrically selected quasar candidates in the southern hemisphere over the ~5000deg^2^ Dark Energy Survey (DES) wide survey area. We combine optical photometry from the DES second data release (DR2) with available near-infrared (NIR) and the all-sky unWISE mid-infrared photometry in the selection. We build models of quasars, galaxies, and stars with multivariate skew-t distributions in the multidimensional space of relative fluxes as functions of redshift (or color for stars) and magnitude. Our selection algorithm assigns probabilities for quasars, galaxies, and stars and simultaneously calculates photometric redshifts (photo-z) for quasar and galaxy candidates. Benchmarking on spectroscopically confirmed objects, we successfully classify (with photometry) 94.7% of quasars, 99.3% of galaxies, and 96.3% of stars when all IR bands (NIR YJHK and WISE W1W2) are available. The classification and photo-z regression success rates decrease when fewer bands are available. Our quasar (galaxy) photo-z quality, defined as the fraction of objects with the difference between the photo-z zp and the spectroscopic redshift zs, |{Delta}z|=|zs-zp|/(1+zs)<=0.1, is 92.2% (98.1%) when all IR bands are available, decreasing to 72.2% (90.0%) using optical DES data only. Our photometric quasar catalog achieves an estimated completeness of 89% and purity of 79% at r<21.5 (0.68 million quasar candidates), with reduced completeness and purity at 21.5<r<~24. Among the 1.4 million quasar candidates, 87857 have existing spectra, and 84978 (96.7%) of them are spectroscopically confirmed quasars.2023ApJS..264....9Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/264/9CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/241 : The 2dF QSO Redshift Survey (Croom+ 2004)VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)II/311 : WISE All-Sky Data Release (Cutri+ 2012)II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)II/359 : The VISTA Hemisphere Survey (VHS) catalog DR4.1 (McMahon+, 2013)II/343 : VIKING catalogue data release 2 (Edge+, 2016)V/156 : LAMOST DR7 catalogs (Luo+, 2019)II/363 : The band-merged unWISE Catalog (Schlafly+, 2019)VII/289 : SDSS quasar catalog, sixteenth data release (DR16Q) (Lyke+, 2020)I/350 : Gaia EDR3 (Gaia Collaboration, 2020)II/371 : The Dark Energy Survey (DES): Data Release 2 (Abbott+, 2021)J/ApJ/651/61 : Optically thick absorbers near luminous QSOs (Hennawi+, 2006)J/AJ/131/1 : Binary quasars in the SDSS (Hennawi+, 2006)J/AJ/132/999 : SDSS quasar lens search (Oguri+, 2006)J/AJ/131/2766 : Quasar luminosity function from SDSS-DR3 (Richards+, 2006)J/AJ/133/2222 : Clustering of high-redshift QSOs from SDSS (Shen+, 2007)J/ApJ/719/1672 : SDSS binary quasars at high redshift. I. (Hennawi+, 2010)J/ApJ/768/105 : z~5 QSO lum. function from SDSS Stripe 82 (McGreer+, 2013)J/ApJ/776/136 : QPQ VI. HI absorption of z~2 quasars (Prochaska+, 2013)J/AJ/154/269 : A new photo-z method for quasars in Stripe 82 (Yang+, 2017)J/ApJS/234/1 : Cat. of M, L, & T dwarfs from PS1 3{pi} Survey (Best+, 2018)J/ApJ/854/160 : SDSS & DES long-term variability QSOs (Rumbaugh+, 2018)J/ApJ/887/268 : Bright QSOs in Southern Hemisphere (Calderone+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/264/9https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/264/9http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/264/9https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/264/9https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/264/9http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/264/9GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/264/9/skewt (The DES DR2 skewt-QSO catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/264/9/skewt?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/264/9/skewt?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/264/9/skewt?GETtext/xml+votable180.050000true54.5600402-67.3905490.005555555555555556Cone search capability for table J/ApJS/264/9/rmphot (Quasar targets for the Black Hole Mapper - reverberation mapping (BHM-RM) program in SDSS-V (Appendix A))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/264/9/rmphot?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/264/9/rmphot?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/264/9/rmphot?GETtext/xml+votable180.050000true35.8288276-4.23626340.0055555555555555562/131 133-135 137-140 142 179-180 3/260-261 273 276-278 281-282 322 328 519 523 529-531 544 546-547 564-566 572 574 711 724 728 4/1024-1025 1028-1029 1031 1085 1088-1090 1101-1103 1116 1121-1123 1132 1136 1173-1174 1177-1178 1189-1190 1193 1216 1280 1282-1283 1294 1316 1318 1320-1322 2075 2087 2091 2114-2115 2181-2183 2268 2270 2292 2302 2440 2466 2472 2474 2839 2843 2900-2902 2904-2906 2916-2918 2920-2922 2964 2966 5/0 2 8-10 2856 2858 4109 4120-4121 4213 4317-4319 4337 4339 4348-4349 4351 4364-4365 4384 4399 4401-4403 4468-4470 4472-4474 4483 4532-4534 4536-4538 4548-4550 4552-4554 4671 4685-4687 4689-4691 4700 4705 4707 4716-4718 4720-4722 4749-4751 4755 4764 4771 4776-4777 4779-4782 4784 4800-4802 4868-4870 5124 5126 5146 5168 5170-5171 5182 5268 5270 5276 5292 5296 5632 6811 6814 6836 8277 8283 8285-8287 8293-8295 8297-8299 8343 8347 8359 8363 8453-8455 8720 8722-8723 9076-9078 9084 9086 9172 9176-9178 9200 9202-9203 9212 9214-9215 9386 9737-9739 9768-9770 9856 9858-9859 9902 11351 11355 11367 11371 11415 11420-11421 11423 11445 11447 11453 11455 11612 11628 11632 11676 11696 11712 11840-11841 11843-11845 11847 11860-11862 11868 12032 6/6 12 14-15 44 128 10741-10743 10748-10749 10751 11402-11403 11406 11428-11430 11436 12292 16416-16417 16420-16421 16432-16433 16435 16488-16489 16492-16493 16495 16768-16769 16772-16773 16784-16785 16787-16790 16832-16833 16836-16837 16848-16849 17247 17353 17381 17383 17391 17401-17403 17464-17466 17468-17469 17471 17540-17541 17567 17583 17587 17589-17591 17593-17595 17600-17601 17603 17884 17900 17904 17925-17927 17929-17931 18140 18156 18160 18204 18220 18224 18240 18304 18655 18671 18675 18677-18679 18681-18683 18804-18806 18808-18810 18812 18819 18825-18827 18896 19013 19015-19017 19019 19060-19062 19064 19066 19068 19075 19078-19079 19081-19083 19112-19113 19115 19140-19142 19144-19146 19148 19152 19212 19232 19484 19520 20500 20502 20508 20510-20511 20576 20578-20579 20678 20698 20720 20722-20723 21078 21084 21086 21108 21112-21113 21172-21174 21176-21178 21188-21189 21192-21194 22532 22534 22536-22538 22560 22562 22568 22570 22656 22658 22664 23210 27238-27239 27250-27251 27260 27262 27332-27333 27348 33105 33107 33130-33131 33138-33139 33165-33167 33170-33171 33187 33366-33367 33369 33371 33381-33383 33385-33387 33431 33433-33435 33447 33451 33792-33794 33796 33803 33805-33807 33809-33811 34884 34886-34887 36316-36318 36340 36342 36348 36350 36692 36696 36698 36716 36718 36806 36826 36854 37538-37539 38912-38914 38920 38925-38927 38938 38945-38947 38960 38962 38968 38970 39056-39058 39064-39066 39084 39088 39430-39431 39440 39442 39448 39450 39472 39474 39480 39482 39568 39570 39576 39600 39602 45397 45399 45402-45403 45415 45419 45461 45463 45466-45467 45477 45479 45483 45654-45655 45659 45688-45689 45691 45777 45785 45787 45809 45811 46452-46453 46456 46516 46520 46532 46536 46708 46712 46768-46770 46772 46776 46788 46792 46852 46856 47189 47368-47369 47371 47385 47413 47415 47452-47454 47476 47480 47556 48132 48136 49119 49141 491433.830199579824256e-20 6.090060298487514e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/264/9?format=asciiOpticalInfrareddefaultJ/ApJS/264/9/skewtThe DES DR2 skewt-QSO catalogNbNIR[0/4] Number of NIR bands (NBAND_NIR)meta.numberintsepNIR[0/2] Angular distance between DES and NIR coordinates (SEPARATION_NIR)arcsecpos.angDistancefloatYmag2[12.8/23.3]? Y band (AB) magnitude (MAG_Y)magphot.mag;em.IR.Jdoublenullablee_Ymag2[0.001/0.7]? Uncertainty on Ymag (MAGERR_Y)magstat.errordoublenullableJmag[13.8/25.4]? J-band (AB) magnitude (MAG_J)magphot.mag;em.IR.Jdoublenullablee_Jmag[0.001/8]? Uncertainty on Jmag (MAGERR_J)magstat.error;phot.magdoublenullableHmag[13/24.1]? H-band (AB) magnitude (MAG_H)magphot.mag;em.IR.Hdoublenullablee_Hmag[0.0009/5]? Uncertainty on Hmag (MAGERR_H)magstat.error;phot.magdoublenullableKmag[12.3/22.7]? K band (AB) magnitude (MAG_K)magphot.mag;em.IR.Kdoublenullablee_Kmag[0.0009/2.2]? Uncertainty on Kmag (MAGERR_K)magstat.error;phot.magdoublenullableBandW[W1/W2 ] WISE bands (BAND_WISE)meta.code;instr.filtercharNbW[0/2] Number of WISE bands (NBAND_WISE)meta.numberintsepWISE[0/2]? Angular distance between DES and unWISE coordinates (SEPARATION_WISE)arcsecpos.angDistancefloatnullableW1mag[11.3/22.5]? WISE W1 (3.4um) band (AB) magnitude (MAG_W1)magphot.mag;em.IR.3-4umdoublenullablee_W1mag[0.0003/0.5]? Uncertainty on W1mag (MAGERR_W1)magstat.error;phot.magdoublenullableW2mag[10.7/21.5]? WISE W2 (4.6um) band (AB) magnitude (MAG_W2)magphot.mag;em.IR.4-8umdoublenullablee_W2mag[-1.5/0.5]? Uncertainty on W2mag (MAGERR_W2)magstat.error;phot.magdoublenullableCombDES, NIR, and MIR band combination (COMBINATION)meta.notecharRef[grizy] DES reference band (REFERENCE_BAND)meta.ref;instr.bandpasscharCoadID[870246065/1700559127] Unique identifier for the coadded objects (COADD_OBJECT_ID)meta.id;meta.mainlongDEJ2000[-67.5/5.4] DES declination (J2000) (DELTAWIN_J2000)degpos.eq.dec;meta.mainindexedClCoad[0/3]? DES morphological object classification variable (EXTENDED_COADD) (1)meta.code.classintnullableSNmax[5/9989] Max. S/N of the PSF mag in DES (SN_MAX_PSF)stat.snrfloatSN3[3/11] Number of bands in DES with S/N>3meta.numberintBand[grizy] DES bands (BAND_DES)meta.code;instr.filterchargmagPSF[-18.3/25.5]? g-band DES PSF magnitude (MAG_PSF_G)magphot.mag;em.opt.Bdoublenullablee_gmagPSF[0.0002/1.3]? gmagPSF uncertainty (MAGERR_PSF_G)magstat.errordoublenullablermagPSF[14.3/25]? r-band DES PSF magnitude (MAG_PSF_R)magphot.mag;em.opt.Rdoublenullablee_rmagPSF[0.0001/1.1]? rmagPSF uncertainty (MAGERR_PSF_R)magstat.errordoublenullableimagPSF[14.7/24.8]? i-band DES PSF magnitude (MAG_PSF_I)magphot.mag;em.opt.Idoublenullablee_imagPSF[0.0002/2.2]? imagPSF uncertainty (MAGERR_PSF_I)magstat.errordoublenullablezmagPSF[14.5/24]? z-band DES PSF magnitude (MAG_PSF_Z)magphot.mag;em.opt.Idoublenullablee_zmagPSF[0.0003/2.1]? zmagPSF uncertainty (MAGERR_PSF_Z)magstat.errordoublenullableYmagPSF[14.2/23.2]? Y-band DES PSF magnitude (MAG_PSF_Y)magphot.mag;em.IR.Jdoublenullablee_YmagPSF[0.0005/4]? YmagPSF uncertainty (MAGERR_PSF_Y)magstat.errordoublenullablegmag[12.8/37.6]? DES AUTO g-band magnitude (MAG_AUTO_G)magphot.mag;em.opt.Bfloatnullablee_gmag[9e-5/28100] Uncertainty on gmag (MAGERR_AUTO_G)magstat.error;phot.magdoublermag[13/32.2]? DES AUTO r-band magnitude (MAG_AUTO_R)magphot.mag;em.opt.Rfloatnullablee_rmag[7e-5/271] Uncertainty on rmag (MAGERR_AUTO_R)magstat.error;phot.magdoubleimag[13.6/33.1]? DES AUTO i-band magnitude (MAG_AUTO_I)magphot.mag;em.opt.Ifloatnullablee_imag[0.0002/1493] Uncertainty on imag (MAGERR_AUTO_I)magstat.error;phot.magdoublezmag[13.3/33.8]? DES AUTO z-band magnitude (MAG_AUTO_Z)magphot.mag;em.opt.Ifloatnullablee_zmag[0.0002/2282] Uncertainty on zmag (MAGERR_AUTO_Z)magstat.error;phot.magdoubleYmag[12.9/33.5]? DES AUTO Y-band magnitude (MAG_AUTO_Y)magphot.mag;em.IR.Jfloatnullablee_Ymag[0.0004/9385] Uncertainty on Ymag (MAGERR_AUTO_Y)magstat.error;phot.magdoublesigPlx[0/5]? Gaia DR2 parallax significance (PLXSIG)stat.fit.goodness;pos.parallaxfloatnullablesigPM[0/5]? Gaia DR2 proper-motion significance (PMSIG)stat.fit.goodness;pos.pmfloatnullablesepGaia[0/2]? Angular distance between DES and Gaia coordinates (SEPARATION_GAIA)arcsecpos.angDistancefloatnullableDist[0.001/10] Angular distance to the closest neighbor within 9"arcsecpos.angDistancedoubleCatNIRNIR survey; i.e. VHS, VIKING, LAS, 2MASS or UHS (SURVEY_NIR)meta.idcharBandNIR[JHKY ] NIR bands (BAND_NIR)meta.code;instr.filtercharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000DES right ascension (J2000) (ALPHAWIN_J2000)degpos.eq.ra;meta.mainindexedCNT9[0/29] Number of sources with a 9" radius circular aperturemeta.numberintPqso[0.3/1] P_QSO_, skewt-QSO probability fitting to QSO models, described in Equation (10) (P_QSO)stat.fit.goodnessfloatzphotQ[0.1/7.4] Quasar photo-z (PHOTOZ_QSO)src.redshift.photfloatz1Q[0.05/7.2] Lower limit of quasar photo-z (Z1_QSO)src.redshift.phot;stat.minfloatz2Q[0.15/7.9]? Upper limit of quasar photo-z (Z2_QSO)src.redshift.phot;stat.maxfloatnullablePzQ[1e-7/1] Probability of quasar photo-z locating within (z1Q, z2Q), described in Equation (5) (P_QSO_Z)stat.fit.goodnessdoublePgal[6e-21/0.5] P_Galaxy_, skewt-QSO probability fitting to galaxy models (P_GALAXY)stat.fit.goodnessdoublezphotG[0.02/1.5] Galaxy photo-z (PHOTOZ_GALAXY)src.redshift.photfloatz1G[0.01/1.5] Lower limit of galaxy photo-z (Z1_GALAXY)src.redshift.phot;stat.minfloatz2G[0.03/1.5]? Upper limit of galaxy photo-z (Z2_GALAXY)src.redshift.phot;stat.maxfloatnullablePzG[5e-7/1] Probability of galaxy photo-z locating within (z1G, z2G), described in Equation (7) (P_GALAXY_Z)stat.fit.goodnessdoublePstar[5e-17/0.5] P_Star_, skewt-QSO probability fitting to star models (P_STAR)stat.fit.goodnessdoublezsp[0.0038/6.9]? Spectroscopic redshift (Z_SPEC)src.redshiftdoublenullableCatzspSpectroscopic redshift catalog, i.e., SDSS, Milliquas, or LAMOST (Z_SPEC_CAT)meta.idcharClspSpectroscopic classification (i.e. 84978 "QSO", 2261 "Galaxy" and 618 "Star") (CLASS_SPEC)meta.code.class;src.classcharPhotDES photometry fitting to quasar and star models; "PSF" or "AUTO" (PHOTOMETRY)meta.notecharJ/ApJS/264/9/rmphotQuasar targets for the Black Hole Mapper - reverberation mapping (BHM-RM) program in SDSS-V (Appendix A)RAJ2000[6.9/216.7] Fiducial right ascension (J2000) (RA)degpos.eq.ra;meta.mainindexedDEJ2000[-68.4/55] Fiducial declination (J2000) (DEC)degpos.eq.dec;meta.mainindexedDist[0.018/1.8] Angular distance from the field center (DISTANCE)degpos.angDistancefloatE(B-V)[0.003/0.32]? Galactic reddening E(B-V) from Schlegel+ (1998ApJ...500..525S) (EBV)magphot.color.excessdoublenullableDESA flag set to 1 if in DES photometric catalogmeta.codegmagDES[13.7/25]? g-band DES PSF magnitude (DES_MAGg)magphot.mag;em.opt.BfloatnullablezmagDES[14/23]? z-band DES PSF magnitude (DES_MAGz)magphot.mag;em.opt.Ifloatnullablee_zmagDES[0.0002/0.25]? zmagDES uncertainty (DES_MAGERRz)magstat.errorfloatnullableYmagDES[11.7/22.6]? Y-band DES PSF magnitude (DES_MAGY)magphot.mag;em.IR.Jfloatnullablee_YmagDES[0.0001/0.5]? YmagDES uncertainty (DES_MAGERRY)magstat.errorfloatnullablePS1A flag set to 1 if in PS1 photometric catalogmeta.codeintgmagPS1[12.2/29.2]? g-band PS1 PSF magnitude (PS1_MAGg)magphot.mag;em.opt.Bfloatnullablee_gmagPS1[0.0003/1135]? gmagPS1 uncertainty (PS1_MAGERRg)magstat.errordoublenullablermagPS1[10.5/27.7]? r-band PS1 PSF magnitude (PS1_MAGr)magphot.mag;em.opt.Rfloatnullablee_rmagPS1[0.0002/17]? rmagPS1 uncertainty (PS1_MAGERRr)magstat.errordoublenullableimagPS1[10.6/23.6]? i-band PS1 PSF magnitude (PS1_MAGi)magphot.mag;em.opt.Ifloatnullablee_imagPS1[0.0002/0.5]? imagPS1 uncertainty (PS1_MAGERRi)magstat.errordoublenullablee_gmagDES[0.0002/0.3]? gmagDES uncertainty (DES_MAGERRg)magstat.errorfloatnullablermagDES[14.5/24.2]? r-band DES PSF magnitude (DES_MAGr)magphot.mag;em.opt.Rfloatnullablee_rmagDES[0.0002/0.25]? rmagDES uncertainty (DES_MAGERRr)magstat.errorfloatnullableimagDES[14.3/23.7]? i-band DES PSF magnitude (DES_MAGi)magphot.mag;em.opt.Ifloatnullablee_imagDES[0.0002/0.24]? imagDES uncertainty (DES_MAGERRi)magstat.errorfloatnullablezmagPS1[11/28.7]? z-band PS1 PSF magnitude (PS1_MAGz)magphot.mag;em.opt.Ifloatnullablee_zmagPS1[0.0002/66]? zmagPS1 uncertainty (PS1_MAGERRz)magstat.errordoublenullableymagPS1[9.7/26.6]? y-band PS1 PSF magnitude (PS1_MAGy)magphot.mag;em.IR.Jfloatnullablee_ymagPS1[0.0003/205]? ymagPS1 uncertainty (PS1_MAGERRy)magstat.error;pos.cartesian.ydoublenullablegmagNSC[11.3/24.5]? g-band NSC PSF magnitude (NSC_MAGg)magphot.mag;em.opt.Bfloatnullablee_gmagNSC[0.0001/0.3]? gmagNSC uncertainty (NSC_MAGERRg)magstat.errorfloatnullablermagNSC[11.5/24.4]? r-band NSC PSF magnitude (NSC_MAGr)magphot.mag;em.opt.Rfloatnullablee_rmagNSC[0.0002/0.3]? rmagNSC uncertainty (NSC_MAGERRr)magstat.errorfloatnullableimagNSC[11.4/23.8]? i-band NSC PSF magnitude (NSC_MAGi)magphot.mag;em.opt.Ifloatnullablee_imagNSC[0.0001/0.3]? imagNSC uncertainty (NSC_MAGERRi)magstat.errorfloatnullablezmagNSC[11/23.7]? z-band NSC PSF magnitude (NSC_MAGz)magphot.mag;em.opt.Ifloatnullablee_zmagNSC[0.0001/0.3]? zmagNSC uncertainty (NSC_MAGERRz)magstat.errorfloatnullableYmagNSC[10.9/22.6]? Y-band NSC PSF magnitude (NSC_MAGY)magphot.mag;em.IR.Jfloatnullablee_YmagNSC[0.0002/0.3]? YmagNSC uncertainty (NSC_MAGERRY)magstat.errorfloatnullableSDSSA flag set to 1 if in SDSS photometric catalogmeta.codeintumagSDSS[10.9/26.6]? u-band SDSS PSF magnitude (SDSS_MAGu)magphot.mag;em.opt.Ufloatnullablee_umagSDSS[0.0004/431]? umagSDSS uncertainty (SDSS_MAGERRu)magstat.error;pos.cartesian.xdoublenullablegmagSDSS[9.8/26.3]? g-band SDSS PSF magnitude (SDSS_MAGg)magphot.mag;em.opt.Bfloatnullablee_gmagSDSS[0.0001/438]? gmagSDSS uncertainty (SDSS_MAGERRg)magstat.errordoublenullablermagSDSS[9.4/25.6]? r-band SDSS PSF magnitude (SDSS_MAGr)magphot.mag;em.opt.Rfloatnullablee_rmagSDSS[0.0001/17]? rmagSDSS uncertainty (SDSS_MAGERRr)magstat.errordoublenullableimagSDSS[9.8/24.4]? i-band SDSS PSF magnitude (SDSS_MAGi)magphot.mag;em.opt.IfloatnullableGCatA flag set to 1 if in Gaia photometric catalogmeta.code.error;phot;meta.tableintGmag[6.8/21.8]? Gaia G-band magnitude (Gaia_MAG_G)magphot.mag;em.optfloatnullablee_Gmag[0.0001/0.08]? Uncertainty on the Gmag (Gaia_MAGERR_G)magstat.error;phot.magfloatnullableBPmag[6.9/23]? Gaia BP-band magnitude (Gaia_MAG_GBP)magphot.mag;em.opt.Bfloatnullablee_BPmag[0.0001/28]? Uncertainty on the BPmag (Gaia_MAGERR_GBP)magstat.error;phot.magfloatnullableRPmag[6.7/23]? Gaia RP-band magnitude (Gaia_MAG_GRP)magphot.mag;em.opt.Rfloatnullablee_RPmag[0.0001/26]? Uncertainty on the RPmag (Gaia_MAGERR_GRP)magstat.error;phot.magfloatnullablesigPlx[0/552]? Gaia DR2 parallax significance (PLXSIG)stat.fit.goodness;pos.parallaxdoublenullablesigPM[0.01/4366]? Gaia DR2 proper-motion significance (PMSIG)stat.fit.goodness;pos.pmdoublenullableWISEA flag set to 1 if in WISE photometric catalogmeta.codeintW1mag[6.6/20.2]? WISE W1 (3.4um) band magnitude (Vega) (WISE_MAGW1)magphot.mag;em.IR.3-4umfloatnullablee_W1mag[0.0002/0.4]? Uncertainty on the W1mag (WISE_MAGERRW1)magstat.error;phot.magfloatnullableW2mag[6.3/18.4]? WISE W2 (4.6um) band magnitude (Vega) (WISE_MAGW2)magphot.mag;em.IR.4-8umfloatnullablee_W2mag[0.0005/0.3]? Uncertainty on the W2mag (WISE_MAGERRW2)magstat.error;phot.magfloatnullablesepWISE[0.003/2]? Angular distance between WISE and the fiducial coordinates (SEPARATION_WISE)arcsecpos.angDistancefloatnullableNIRA flag set to 1 if in NIR photometric catalogmeta.codeintYmag[10.5/21.7]? Y band (Vega) magnitude (NIR_MAGY)magphot.mag;em.IR.Jdoublenullablee_Ymag[0.0003/0.6]? Uncertainty on the Ymag (NIR_MAGERRY)magstat.error;phot.magdoublenullableJmag[9.6/21.4]? J-band (Vega) magnitude (NIR_MAGJ)magphot.mag;em.IR.Jdoublenullablee_Jmag[0.0002/1]? Uncertainty on the Jmag (NIR_MAGERRJ)magstat.error;phot.magdoublenullableHmag[10/20.6]? H-band (Vega) magnitude (NIR_MAGH)magphot.mag;em.IR.Hdoublenullablee_Hmag[0.0004/0.5]? Uncertainty on the Hmag (NIR_MAGERRH)magstat.error;phot.magdoublenullableKmag[9.5/21.4]? K band (Vega) magnitude (NIR_MAGK)magphot.mag;em.IR.Kdoublenullablee_Kmag[0.0004/0.6]? Uncertainty on the Kmag (NIR_MAGERRK)magstat.error;phot.magdoublenullablesepNIR[0.002/2]? Angular distance between NIR and the fiducial coordinates (SEPARATION_NIR)arcsecpos.angDistancefloatnullableimag[10.5/24.4]? i-band PSF magnitude (MI)magphot.mag;em.opt.IfloatnullableNopt[3/5] Number of optical bands used in skewt-QSO (NBAND_OPTICAL)meta.numberintCombOptical, NIR, and MIR survey combination (Combination)meta.notecharlogQSO[-37.2/5.2] Natural logarithmic probability of a target fitting to QSO (Equation (9)) (LOG_QSO)stat.fit.goodnessdoublePqso[0.3/1] PQSO, skewt-QSO probability fitting to QSO models, described in Equation (10) (P_QSO)stat.fit.goodnessfloatPstar[0/0.5] PStar, skewt-QSO probability fitting to star models (P_STAR)stat.fit.goodnessdoublePgal[8.4e-9/0.5] PGalaxy, skewt-QSO probability fitting to galaxy models (P_GALAXY)stat.fit.goodnessdoublePqGaia[/1]? P_QSO using Gaia/NSC photometric data (for the S-CVZ field) (P_QSO_Gaia)stat.fit.goodnessdoublenullablePsGaia[/1]? P_Star using Gaia/NSC photometric data (for the S-CVZ field) (P_STAR_Gaia)stat.fit.goodnessdoublenullablePgalGaia[/1]? Galaxy using Gaia/NSC photometric data (for the S-CVZ field) (P_GALAXY_Gaia)stat.fit.goodnessdoublenullablezphotQ[0.1/6.5] Quasar photo-z (PHOTOZ_QSO)src.redshift.photfloatz1Q[0.05/6] Lower limit of quasar photo-z (z1_QSO)src.redshift.phot;stat.minfloatz2Q[0.1/6.3]? Upper limit of quasar photo-z (z2_QSO)src.redshift.phot;stat.maxfloatnullablePqsoz[8e-7/1] Probability of quasar photo-z locating within (z1QSO, z2QSO), described in Equation (5) (P_QSO_z)stat.fit.goodnessdoubleCatNIRNIR survey (SURVEY_NIR)meta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFieldField identifier (FIELD_NAME)meta.id;obs.fieldcharr_posFiducial coordinates reference, priority: Gaia>DES>PS1>NSC (POS_REF)meta.ref;pos.framecharNSCA flag set to 1 if in NSC catalogmeta.codeinte_imagSDSS[0.0001/646]? imagSDSS uncertainty (SDSS_MAGERRi)magstat.errordoublenullablezmagSDSS[9.5/24]? z-band SDSS PSF magnitude (SDSS_MAGz)magphot.mag;em.opt.Ifloatnullablee_zmagSDSS[0.0002/42]? zmagSDSS uncertainty (SDSS_MAGERRz)magstat.errordoublenullableCatOptOptical survey used in skewt-QSO, e.g., DES, PS1, Gaia, NSC (OPTICAL_SURVEY)meta.idchar