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/ApJS/269/7
  Chandra Cygnus OB2 Legacy Survey: X-ray Catalog (Wright+ 2023)
ReadMe+ftp
2023ApJS..269....7W
Similar Catalogs
Post annotation 		img(gal)
1.J/ApJS/269/7/table2Chandra Cygnus OB2 Legacy Survey Catalog (7924 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)
  Number   [1/7924] X-ray source number within the Chandra Cygnus OB2 Legacy Survey (meta.id)
  Name (char) IAU source name, CXOCOB2 JHHMMSS.ss+DDMMSS.s (meta.id;meta.main)
  RAJ2000 deg (i) Right ascension (J2000.0) (pos.eq.ra;meta.main)
  DEJ2000 deg (i) Declination (J2000.0) (pos.eq.dec;meta.main)
  PosErr arcsec 1 sigma error circle around source position (stat.error)
  PosType (char) Method used to estimate source position (Note 1)   (meta.code)
  SusFlag   [0] Flag indicating the source is close to known PSF feature (Note 2)   (meta.code)
  Signif  Source significance (from full band) (stat.fit.goodness)
  PrbNoSrc  Base 10 logarithm of the p-value for no-source null hypothesis (stat.fit.goodness)
  PrbBand (char) Band used for PrbNoSrc (Note 3)   (instr.bandpass)

ALL cols		    
 (i)indexed column
  DetMeth   [0/5] Method used for detecting the candidate source (Note 4)   (meta.code)
  ExpTmTot s Total exposure time in all observations (time.duration;obs)
  ExpTmNom s Exposure time in all merged observations used for photometry (instr.setup;obs)
  ExpTmFra  Fration of ExpTmTot used for photometry (time.expo)
  NumObTot  Total number of observations of the source (meta.number)
  NumObNom  Number of observations of the source merged for photometry (meta.number)
  b_Theta arcmin Smallest off-axis angle for merged observations (instr.offset)
  Theta arcmin Average off-axis angle for merged observations (instr.offset)
  B_Theta arcmin Largest off-axis angle for merged observations (instr.offset;stat.max)
  PSFFrac  Average PSF fraction (at 1.5keV) for merged observations (instr.det.psf)
  SrcArea pix+2 Average aperture area for merged observations (phys.angSize;instr.fov)
  ProbKSs  Smallest p-value for the non-variable null hypothesis from a single observation (stat.fit.goodness)
  ProbKSm  Smallest p-value for the non-variable null hypothesis from all merged observations (stat.fit.goodness)

ALL cols		    
 (i)indexed column
  SCntFull ct Observed counts in merged source apertures (full band) (phot.count;em.X-ray)
  SCntSoft ct Observed counts in merged source apertures (soft band) (phot.count;em.X-ray)
  SCntHard ct Observed counts in merged source apertures (hard band) (phot.count;em.X-ray)
  BCntFull ct Observed counts in merged background regions (full band) (phot.count;em.X-ray)
  BCntSoft ct Observed counts in merged background regions (soft band) (phot.count;em.X-ray)
  BCntHard ct Observed counts in merged background regions (hard band) (phot.count;em.X-ray)
  BkgScale  Scaling of the background extraction region (instr.background)
  NCntFull ct Net counts in merged source apertures (full band) (phot.count;em.X-ray)
  NCntSoft ct Net counts in merged source apertures (soft band) (phot.count;em.X-ray)
  NCntHard ct Net counts in merged source apertures (hard band) (phot.count;em.X-ray)
  ARFFull 10-7J/cm2/phMean ARF value (full band) (in erg/cm2/ph) (Note 5)   (stat.value;stat.mean)
  ARFSoft 10-7J/cm2/phMean ARF value (soft band) (in erg/cm2/ph) (Note 5)   (stat.value;stat.mean)
  ARFHard 10-7J/cm2/phMean ARF value (hard band) (in erg/cm2/ph) (Note 5)   (stat.value;stat.mean)

ALL cols		    
 (i)indexed column
  MedEFull keV Median energy of the observed spectrum (full band) (em.energy)
  MedESoft keV (n) Median energy of the observed spectrum (soft band) (em.energy)
  MedEHard keV (n) Median energy of the observed spectrum (hard band) (em.energy)
  FluxFull mW/m2 Energy flux of the observed spectrum (full band) (in erg/cm2/s) (phot.flux;em.X-ray)
  FluxSoft mW/m2 (n) Energy flux of the observed spectrum (soft band) (in erg/cm2/s) (phot.flux;em.X-ray)
  FluxHard mW/m2 (n) Energy flux of the observed spectrum (hard band) (in erg/cm2/s) (phot.flux;em.X-ray)
  b_NCntFull ct 1 sigma lower bound on NCntFull (stat.stdev;stat.min)
  B_NCntFull ct 1 sigma upper bound on NCntFull (stat.stdev;stat.max)
  b_NCntSoft ct (n) 1 sigma lower bound on NCntSoft (stat.stdev;stat.min)
  B_NCntSoft ct 1 sigma upper bound on NCntSoft (stat.stdev;stat.max)
  b_NCntHard ct (n) 1 sigma lower bound on NCntHard (stat.stdev;stat.min)
  B_NCntHard ct 1 sigma upper bound on NCntHard (stat.stdev;stat.max)

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