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Simple TargetList Of TargetsFast Xmatch with large catalogs or Simbad
Target Name (resolved by Sesame) or Position:
 Target dimension:
NB: The epoch used for the query is the original epoch of the table(s)Radius Box size

  
J/A+A/710/A170
  4MOST ChANGES high-redshift QSO candidates (Mkrtchyan+, 2026)
ReadMe+ftp
2026A&A...710A.170M
Similar Catalogs
Post annotation 		img(gal)
1.J/A+A/710/A170/catalogCatalog of high-redshift quasar candidates (6104 rows)

Simple ConstraintList Of Constraints
 
Query by Constraints constraints help applied on Columns (Output Order: + - )
ShowSortColumn  Constraint Explain   (UCD)
  recno  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)
  ObjectId  Source ID from DELVE DR2 (object_id) (meta.id;meta.main)
  RAJ2000 deg (i) Right ascension (J2000, DELVE DR2, Drlica-Wagner et al., 2022ApJS..261...38D) (ra) (pos.eq.ra;meta.main)
  DEJ2000 deg (i) Declination (J2000, DELVE DR2, Drlica-Wagner et al., 2022ApJS..261...38D) (dec) (pos.eq.dec;meta.main)
  BDchi2min  Minimum chi2 for best-fit brown dwarf template (BDchi2min) (stat.fit.chi2;stat.min)
  BDchi2 (char) Best-fit brown dwarf template type template (MD1, MD2, MD3, BD1, BD2, BD3) (BDchi2) (meta.id;stat.fit)
  QSOchi2min  Minimum chi2 for best-fit QSO template (QSOchi2min) (stat.fit.chi2)
  zQSO  Photometric redshift from best-fit QSO template (QSO_z) (src.redshift.phot)
  Rchi2  Ratio of QSO to BD chi2; values <1 indicate better QSO fit (R_chi2) (stat.fit.chi2)
  Ftestvalue  F-test statistic value; >10 required for selection (Ftestvalue) (stat.fit.param)
  BICvalue  Bayesian Information Criterion; >0 required for selection (BIC_value) (stat.fit.param)

ALL cols		    
 (i)indexed column
  E(B-V)QSO mag E(B-V) dust reddening of best-fit QSO template (QSO_EBV) (phot.color.excess)
  EMlineQSO  Emission line strength of best-fit QSO template (-2, 0, 2) (QSO_EMline) (spect.line.intensity)
  NPoints  Number of photometric bands used in SED fitting (Data_Points) (meta.number)
  QSOPar  Number of free parameters of best-fit QSO template (QSO_Par) (meta.number)
  Prior   [1/2] Source priority tier (1=higher, 2=lower confidence) (Prioritization) (Note 1)   (meta.code)
  gmagDEL mag (n) AB Kron g-band magnitude (DELVE DR2) (maggdelve) (phot.mag;em.opt.B)
  e_gmagDEL mag (n) Uncertainty on maggdelve (magerrgdelve) (stat.error)
  imagDEL mag (n) AB Kron i-band magnitude (DELVE DR2) (magidelve) (phot.mag;em.opt.I)
  e_imagDEL mag (n) Uncertainty on magidelve (magerridelve) (stat.error)
  rmagDEL mag (n) AB Kron r-band magnitude (DELVE DR2) (magrdelve) (phot.mag;em.opt.R)
  e_rmagDEL mag (n) Uncertainty on magrdelve (magerrrdelve) (stat.error)
  zmagDEL mag (n) AB Kron z-band magnitude (DELVE DR2) (magzdelve) (phot.mag;em.opt.I)
  e_zmagDEL mag (n) Uncertainty on magzdelve (magerrzdelve) (stat.error)

ALL cols		    
(n) indicates a possible blank or NULL column(i)indexed column
  W1mag mag (n) WISE W1 (3.4 micron) magnitude (CatWISE 2020); AB system (w1mpro) (phot.mag;em.IR.3-4um)
  e_W1mag mag (n) Uncertainty on w1mpro (w1sigmpro) (stat.error;phot.mag)
  W2mag mag (n) WISE W2 (4.6 micron) magnitude (CatWISE 2020); AB system (w2mpro) (phot.mag;em.IR.4-8um)
  e_W2mag mag (n) Uncertainty on w2mpro (w2sigmpro) (stat.error;phot.mag)
  YmagV mag (n) VHS/VIKING Y-band Petrosian magnitude; AB system (ypetromag) (phot.mag;em.IR.J)
  e_YmagV mag (n) Uncertainty on ypetromag (ypetromagerr) (stat.error)
  JmagV mag (n) VHS/VIKING J-band Petrosian magnitude; AB system (jpetromag) (phot.mag;em.IR.J)
  e_JmagV mag (n) Uncertainty on jpetromag (jpetromagerr) (stat.error;phot.mag)
  HmagV mag (n) VHS/VIKING H-band Petrosian magnitude; AB system (hpetromag) (phot.mag;em.IR.H)
  e_HmagV mag (n) Uncertainty on hpetromag (hpetromagerr) (stat.error;phot.mag)
  KsmagV mag (n) VHS/VIKING Ks-band Petrosian magnitude; AB system (kspetromag) (phot.mag;em.IR.K)
  e_KsmagV mag (n) Uncertainty on kspetromag (kspetromagerr) (stat.error;phot.mag)
  gmagDEC mag (n) AB Kron g-band magnitude (DECaLS DR10, Dey et al., 2019AJ....157..168D) (maggdecals) (phot.mag;em.opt.B)
  snrgDEC  (n) Signal-to-noise ratio for maggdecals (snrgdecals) (meta.note)
  rmagDEC mag (n) AB Kron r-band magnitude (DECaLS DR10, Dey et al., 2019AJ....157..168D) (magrdecals) (phot.mag;em.opt.R)
  snrrDEC  (n) Signal-to-noise ratio for magrdecals (snrrdecals) (meta.note)
  imagDEC mag (n) AB Kron i-band magnitude (DECaLS DR10, Dey et al., 2019AJ....157..168D) (magidecals) (phot.mag;em.opt.I)
  snriDEC  (n) Signal-to-noise ratio for magidecals (snridecals) (meta.note)
  zmagDEC mag (n) AB Kron z-band magnitude (DECaLS DR10, Dey et al., 2019AJ....157..168D) (magzdecals) (phot.mag;em.opt.I)
  snrzDEC  (n) Signal-to-noise ratio for magzdecals (snrzdecals) (meta.note)
  E(B-V) mag Galactic dust reddening E(B-V) from SFD maps (Schlegel et al., 1998ApJ...500..525S) (ebv) (phot.color.excess)

ALL cols		    
(n) indicates a possible blank or NULL column(i)indexed column
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