VizieR

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

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/MNRAS/498/4033
  Extreme quasar X-ray variability (Timlin+, 2020)
ReadMe+ftp
2020MNRAS.498.4033T
Similar Catalogs
Post annotation 		img(gal)
1.J/MNRAS/498/4033/appenaQuasars with duplicate Chandra observations (table A1) (1972 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)
  Name (char) Object Name (HHMMSS.ssss+DDMMSS.ssss) (meta.id;meta.main)
  RAJ2000 deg (i) Right Ascension (J2000) (pos.eq.ra;meta.main)
  DEJ2000 deg (i) Declination (J2000) (pos.eq.dec;meta.main)
  z  Redshift (Note 1)   (src.redshift)
  logNH [cm-2] log Galactic column density (Note 2)   (phys.columnDensity;pos.galactic)
  MJD d MJD of the Chandra observation (time.epoch;obs)
  imag mag Apparent i-band magnitude (phot.mag;em.opt.I)
  Ei mag Reddening in the i-band (Note 3)   (phot.color.excess)
  ObsID  Chandra observation ID (meta.id;obs)
  Theta arcmin Chandra off-axis angle (instr.offset)

ALL cols		    
 (i)indexed column
  Tefffull s Full-band effective exposure time (time.duration;obs.exposure)
  Pbsoft   [0/1] Binomial probability of detection (soft band) (stat.fit.goodness)
  Pbhard   [0/1] Binomial probability of detection (hard band) (stat.fit.goodness)
  Pbfull   [0/1] Binomial probability of detection (full band) (stat.fit.goodness)
  CTFull ct Net counts in the full band (phot.count;em.X-ray)
  E_CTFull ct One sigma upper limit on net counts (stat.error;stat.max)
  e_CTFull ct One sigma lower limit on net counts (stat.error)
  meanSRCExpf cm2.s Mean exposure map pixel value of the source region (stat.value;obs.field;stat.mean)
  meanBGExpf cm2.s Mean exposure map pixel value of the background region (instr.background;obs.field;stat.mean)
  ChipEdge   [0/1] Chip-edge flag (Note 4)   (meta.code)
  Tstart s Chandra start time (time.start)
  fbrightCl  (n) [0/1] Bright cluster flag (Note 5)   (meta.code)
  BALFlag  (n) [0/3] BAL flag (Note 6)   (meta.code)
  iMAG mag Absolute magnitude (corrected to z=2) (phys.magAbs)
  logL2500 [10-7W/Hz]Logarithm of the rest-frame monochromatic 2500Å luminosity (erg/s/Hz) (phys.luminosity)
  logF2500 [mW/m2/Hz]Logarithm of the rest-frame monochromatic 2500Å flux density (erg/cm2/s/Hz) (phot.flux)
  logR  Logarithm of the radio-loudness parameter, R (phot.flux;arith.ratio)
  SimbadName (char) (n)Designation understandable by the Simbad data-base (meta.id)

ALL cols		    
(n) indicates a possible blank or NULL column(i)indexed column
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usage  Display UCD1+    UCD1  
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