VizieR

CfA VizieR . ADAC VizieR . Cambridge (UK) VizieR . IUCAA VizieR . INASAN VizieR .

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/905/52
  Extreme variability QSOs from SDSS DR16 (Guo+, 2020)
ReadMe+ftp
2020ApJ...905...52G
Similar Catalogs
spectrum
Post annotation 		img(gal)
1.J/ApJ/905/52/table3Catalog[spectrum] (696 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);phys.veloc.orbital;arith.diff;phys.veloc)
  GroupID   [10859/292717] SDSS DR16 repeat catalog object identifier ((unassigned);phys.veloc.orbital;arith.diff;spect.line.veloc)
  m_GroupID  (n)Number of SDSS spectra in this table for this quasar ((unassigned);phys.veloc.orbital;arith.diff;src.var)
  Plate   [309/11703] SDSS spectroscopic plate number ((unassigned);phys.veloc.orbital;arith.diff;spect.line.veloc;phys.atmol.qn.F)
  MJD d [51792/58543] Modified Julian Date of spectroscopic observation ((unassigned);phys.veloc.orbital;arith.diff;pos.centroid;meta.main)
  Fiber   [2/1000] SDSS spectroscopic fiber number ((unassigned);phys.veloc.orbital;arith.diff;src.var;instr.det.psf;meta.main)
  RAJ2000 deg Right Ascension (J2000) ((unassigned);phys.at.moment.magnetic;arith.diff;(unassigned);arith)
  DEJ2000 deg [-8.5/65.6] Declination (J2000) ((unassigned);(unassigned);arith;(unassigned);arith)
  z   [1.5/4] Spectroscopic redshift (meta.code.mime;(unassigned);arith.diff;pos.parallax;meta.main)
  Nep   [2/23] Number of spectroscopic observations ((unassigned);(unassigned);(unassigned);src.var)
  FIRST   [-1/1] FIRST detection code (1=detected; -1=out of FIRST footprint) ((unassigned);(unassigned);(unassigned);pos.eq.dec)

ALL cols		    
(n) indicates a possible blank or NULL column(i)indexed column
  F1.4GHz mJy (n) [0.7/160] Observed FIRST 20cm flux density ((unassigned);stat.error;arith.factor;phys.atmol.sWeight.nuclear;(unassigned);(unassigned))
  Flag   [-1/1] Brightest/faintest epoch flag (1=brightest or -1=faintest epoch) ((unassigned);phys.veloc.orbital;arith.diff;pos.galactic.lon)
  1450avg   [1/2.1] Rest frame 1450Å continuum variability (Note 1)   ((unassigned);phys.veloc.orbital;arith.diff;pos.cartesian;(unassigned);meta.main)
  F1450 cW/m2/nm [-0.007/122] Rest frame 1450Å flux density; erg/s/cm2/Å ((unassigned);phys.veloc.orbital;arith.diff;meta.abstract)
  SN1450   [-0.012/26] Signal-to-Noise at 1450Å ((unassigned);(unassigned);(unassigned);meta.abstract;meta.main)
  SNCIV   [0.1/57.2] Signal-to-Noise of CIV line ((unassigned);(unassigned);(unassigned);meta.abstract;meta.main)
  L1350 [10-7W] [-1/47.2] Log monochromatic 1350Å luminosity; erg/s ((unassigned);(unassigned);(unassigned);(unassigned))
  e_L1350 [10-7W] (n) [0/0.3] Uncertainty in L1350 ((unassigned);(unassigned);(unassigned);time.age;meta.main)
  FWHM-civ km/s [1199/13274] Whole CIV line Full-Width at Half-Maximum (meta.id.parent;(unassigned);arith.factor;phys.atmol.element;meta.main)
  e_FWHM-civ km/s (n) [0.2/7636] Uncertainty in FWHM-civ ((unassigned);(unassigned);(unassigned);time.age;meta.main)
  EW-civ 0.1nm [13.6/283.8] Rest frame broad CIV equivalent width; in Angstroms ((unassigned);(unassigned);(unassigned);phys.at.moment.magnetic;meta.main)
  e_EW-civ 0.1nm (n) [0/89.6] Uncertainty in EW-civ (phot.color;(unassigned);arith.grad;time.age;phys.atmol.number;meta.main)
  BH-civ [Msun] (n) [7.2/9.8] Log virial BH mass from CIV (Note 2)   ((unassigned);phys.veloc.orbital;arith.diff;(unassigned))
  e_BH-civ [Msun] (n) [0.001/1.2] Uncertainty in BH-civ ((unassigned);(unassigned);(unassigned);time.age;meta.main)
  BH-mean [Msun] (n) [7.4/10] Log adopted fiducial virial BH mass (Note 3)   ((unassigned);(unassigned);stat.min;(unassigned))
  e_BH-mean [Msun] (n) [0.002/1.2] Uncertainty in BH-mean ((unassigned);(unassigned);(unassigned);time.age;meta.main)
  LogEdd [-] (n) [-2.1/0.3] Log Eddington ratio based on logMBHa ((unassigned);(unassigned);(unassigned);(unassigned);instr.offset)
  chi2   [1.4/33] Reduced {chi}2 for CIV line fitting ((unassigned);phys.veloc.orbital;arith.diff;time.resolution;meta.main)
  Type   [0/1] Type (0=changing-look quasar (CLQ); 1=extreme variability quasar (EVQ), 650 occurrences) ((unassigned);phys.veloc.orbital;arith.diff;pos.eq.dec)
  DR16  Display data from the SDSS DR16 (V/154) and DR16Q (VII/289) catalogs ((unassigned);(unassigned);(unassigned);pos.geocentric)
  Sp  Interactive spectrum from SDSS-DR16 ((unassigned);(unassigned);(unassigned);pos.geocentric)
spectrum
  SimbadName (char) (n)Designation understandable by the Simbad data-base ((unassigned);(unassigned);(unassigned);spect.line.veloc)
  NED  ask the NED data-base about this object ((unassigned);(unassigned);(unassigned);pos.geocentric)

ALL cols		    
(n) indicates a possible blank or NULL column(i)indexed column
Adapt form
 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=846455075 Where phase=3 and catid=19050052
**** 
**** --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/VR451138.err (2026-10-27T22:24:34)
-3
-source=J/ApJ/905/52
-ref=VIZ6ae124a36e242
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