VizieR

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VizieR

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/ApJ/887/134
  Classification of Fermi blazar cand. from the 4FGL (Kang+, 2019)
ReadMe+ftp
2019ApJ...887..134K
Similar Catalogs
Post annotation 		img(gal)
1.J/ApJ/887/134/table3The classification of Fermi blazar candidates of an unknown type (BCUs) (1312 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. ((unassigned);(unassigned);(unassigned);phys.veloc)
  Seq   [1/1312] Sequential running identifier ((unassigned);meta.version;arith.diff;phys.veloc)
  4FGL (char) 4FGL Source Name ((unassigned);(unassigned);(unassigned);spect.line.veloc;arith)
  Cntpt (char) Counterpart name (spect.index;instr.det;stat.min;spect.line.veloc)
  C4FGL (char) Optical class (always "bcu") (Note 1)   (instr.fov;phys.atmol.term;arith.grad;pos.galactic)
  CRF (char) Random Forest classification ("bll": 835 occurrences or "fsrq": 477 occurrences) (Note 2)   ((unassigned);(unassigned);(unassigned);phys.atmol.sweight;meta.main)
  PBi-RF   [0/1] Probability BCU i belongs to BL Lac using RF ((unassigned);meta.version;arith.diff;phys.polarization.circular;meta.main)
  PFi-RF   [0/1] Probability BCU i belongs to FSRQ using RF (time.equinox;phys.recombination.coeff;arith.factor;phys.polarization.circular;meta.main)
  CSVM (char) Support Vector Machines classification ("bll": 858 occurrences or "fsrq": 454 occurrences) (Note 2)   (pos.cylindrical;em.mm.400-750GHz;arith;phys.atmol.sweight;meta.main)
  PBi-SVM   [0.016/1] Probability BCU i belongs to BL Lac using SVM ((unassigned);(unassigned);(unassigned);phys.polarization.circular;meta.main)
  PFi-SVM   [0.0005/0.99] Probability BCU i belongs to FSRQ using SVM ((unassigned);(unassigned);(unassigned);phys.polarization.circular;meta.main)
  CANN (char) Artificial neural network classification ("bll": 868 occurrences or "fsrq": 444 occurrences) (Note 2)   ((unassigned);meta.version;arith.diff;phys.atmol.sweight;meta.main)
  PBi-ANN   [0.1/0.9] Probability BCU i belongs to BL Lac using ANN (pos.galactic.lon;meta.id;arith.factor;phys.polarization.circular;meta.main)
  PFi-ANN   [0.1/0.9] Probability BCU i belongs to FSRQ using ANN ((unassigned);instr.bandpass;stat.min;phys.polarization.circular;meta.main)
  Simbad  ask the Simbad data-base about this object (time.equinox;(unassigned);arith.factor;pos.geocentric)
  _RA deg Right Ascension (J2000) from SIMBAD (not part of the original data) ((unassigned);(unassigned);(unassigned);(unassigned);arith)
  _DE deg Declination (J2000) from SIMBAD (not part of the original data) ((unassigned);(unassigned);(unassigned);(unassigned);arith)

ALL cols		    
 (i)indexed column
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 Display your selection only Reset to default columns
usage  Display UCD1+    UCD1  

The following problems were encountered in this VizieR run:
****Error execute query: UPDATE METAstat set nother=nother+1, tother=846455017 Where phase=3 and catid=18870134
**** 
**** --POSTGRES MSG db=1
**** Report from: stdb_pg,     Status: STDB_ERR 
****ERROR:  invalid page in block 0 of relation base/16403/6104 
****ERROR:  invalid page in block 0 of relation base/16403/6104
If you can't find a solution, report to CDS and insert into your message the following details:

.errorfile=/tmp/VR448709.err (2026-10-27T22:23:36)
-3
-source=J/ApJ/887/134/table3
-ref=VIZ6ae124696d8c5
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