VizieR

CfA VizieR . ADAC VizieR . Cambridge (UK) VizieR . IUCAA VizieR . INASAN 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/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. (meta.record)
  GroupID   [10859/292717] SDSS DR16 repeat catalog object identifier (meta.id)
  m_GroupID  (n)Number of SDSS spectra in this table for this quasar (meta.number)
  Plate   [309/11703] SDSS spectroscopic plate number (meta.id;instr.plate)
  MJD d [51792/58543] Modified Julian Date of spectroscopic observation (time.epoch)
  Fiber   [2/1000] SDSS spectroscopic fiber number (meta.number;pos.parallax.spect)
  RAJ2000 deg (i) Right Ascension (J2000) (pos.eq.ra;meta.main)
  DEJ2000 deg (i) [-8.5/65.6] Declination (J2000) (pos.eq.dec;meta.main)
  z   [1.5/4] Spectroscopic redshift (src.redshift)
  Nep   [2/23] Number of spectroscopic observations (meta.number)
  FIRST   [-1/1] FIRST detection code (1=detected; -1=out of FIRST footprint) (meta.code)

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 (phot.flux.density;em.radio.750-1500MHz)
  Flag   [-1/1] Brightest/faintest epoch flag (1=brightest or -1=faintest epoch) (meta.code.error)
  1450avg   [1/2.1] Rest frame 1450Å continuum variability (Note 1)   (src.var;spect.continuum)
  F1450 cW/m2/nm [-0.007/122] Rest frame 1450Å flux density; erg/s/cm2/Å (phot.flux)
  SN1450   [-0.012/26] Signal-to-Noise at 1450Å (stat.snr)
  SNCIV   [0.1/57.2] Signal-to-Noise of CIV line (stat.snr)
  L1350 [10-7W] [-1/47.2] Log monochromatic 1350Å luminosity; erg/s (phys.luminosity)
  e_L1350 [10-7W] (n) [0/0.3] Uncertainty in L1350 (stat.error)
  FWHM-civ km/s [1199/13274] Whole CIV line Full-Width at Half-Maximum (spect.line.width)
  e_FWHM-civ km/s (n) [0.2/7636] Uncertainty in FWHM-civ (stat.error)
  EW-civ 0.1nm [13.6/283.8] Rest frame broad CIV equivalent width; in Angstroms (spect.line.eqWidth)
  e_EW-civ 0.1nm (n) [0/89.6] Uncertainty in EW-civ (stat.error;spect.line.eqWidth)
  BH-civ [Msun] (n) [7.2/9.8] Log virial BH mass from CIV (Note 2)   (phys.mass)
  e_BH-civ [Msun] (n) [0.001/1.2] Uncertainty in BH-civ (stat.error)
  BH-mean [Msun] (n) [7.4/10] Log adopted fiducial virial BH mass (Note 3)   (phys.mass)
  e_BH-mean [Msun] (n) [0.002/1.2] Uncertainty in BH-mean (stat.error)
  LogEdd [-] (n) [-2.1/0.3] Log Eddington ratio based on logMBHa (phys.mass;arith.ratio)
  chi2   [1.4/33] Reduced χ2 for CIV line fitting (stat.fit.chi2)
  Type   [0/1] Type (0=changing-look quasar (CLQ); 1=extreme variability quasar (EVQ), 650 occurrences) (meta.code)
  DR16  Display data from the SDSS DR16 (V/154) and DR16Q (VII/289) catalogs (meta.ref.url)
  Sp  Interactive spectrum from SDSS-DR16 (meta.ref.url)
spectrum
  SimbadName (char) (n)Designation understandable by the Simbad data-base (meta.id)
  NED  ask the NED data-base about this object (meta.ref.url)

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