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/743/171
  The 2LAC catalog (Ackermann+, 2011)
ReadMe+ftp
2011ApJ...743..171A
Similar Catalogs
[METAcat] [METAcells] [stats]
Post annotation 		img(gal)
1.J/ApJ/743/171/2LAC2LAC catalog: high latitude (tables 3 and 7) and low-latitude sources ((tables 4 and 8) (1121 rows) (released 2017-09-22)
[METAtab] [METAcola]

Simple ConstraintList Of Constraints
 
Query by Constraints constraints help applied on Columns (Output Order: + - ) [METAcola]
ShowSortColumn  Constraint Explain   (UCD)
  recno  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)
  S (char) Sample: Low-latitude (|b|<10°) or High-latitude (meta.id)
  2FGL (char) (i) Name of the 2FGL source (JHHMM.m+DDMM) (meta.id;meta.main)
  T (char) T indicates TeV-sources (properties in table 9) (meta.ref.url)
  Cl? (char) [NY] Source in Clean sample: Y=Yes, N=No (meta.code)
  List (char) [NY] Source in 2FGL list: Y=Yes, N=No (meta.code)
  CName (char) Name of the counterpart (meta.id)
  RAJ2000 deg (i) Counterpart right ascension (J2000) (pos.eq.ra;meta.main)
  DEJ2000 deg (i) Counterpart declination (J2000) (pos.eq.dec;meta.main)
  Sep deg [0.001/0.454] 2FGL and its counterpart angular separation (pos;arith.diff)
  ePos deg [0.01/0.387] The 95% error radius (stat.error)

ALL cols		    
 (i)indexed column
  OType (char) Optical object type (Note G1)   (spect.dopplerVeloc.opt;em.opt)
  SED (char) Type of SED; "-" indicates a NULL value (Note G2)   (meta.note)
  z  (n) [0/3.215] Redshift (Note 1)   (src.redshift)
  SpI   [1.12/3] Spectral Index α (spect.index)
  e_SpI  Error in SpInd (stat.error)
  pr  (n) The Bayesian probability of counterpart (stat.fit.goodness)
  NSpr  (n) The logN-logS probability of counterpart (stat.fit.goodness)
  RGpr  (n) Likelihood ratio reliability for Radio-Gamma association (stat.fit.goodness)
  XGpr  (n) Likelihood ratio reliability for X-Gamma association (stat.fit.goodness)
  SimbadName (char) Designation understandable by the Simbad data-base (meta.id)
  TS  Test Statistics: significance (stat.fit.goodness)
  RFlux mJy (n) [4/138488] Radio flux (phot.flux.density;em.radio)
  XFlux 10-16W/m2(n) [0.26/7640] X-ray flux; in units of 10–13erg/cm2/s (phot.flux;em.X-ray)
  Vmag1 mag (n) [8.08/23.15] USNO V band magnitude (phot.mag;em.opt.V)
  Vmag2 mag (n) SDSS V band magnitude (phot.mag;em.opt.V)
  aox  (n) Rest frame, multi-frequency optical/X-ray spectral index (between 5000Å and 1keV) (Note 1)   (spect.index)
  aro  (n) Rest frame, multi-frequency radio/optical spectral index (between 5GHz and 5000Å) (Note 1)   (spect.index)

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  
.errorfile=/tmp/V-3.err (2025-08-24T01:12:23)
-3
-source=J/ApJ/743/171/2LAC
-ref=VIZ68aa66f7367682
elapse time 0

Options: wopt=0, optS=0, onote=0, opt1=8, opos=0

Contents of error file (/tmp/V-3.err):
-rwxr-xr-x 1 root root 963736 Jun 11 08:12 /srv/httpd/bin/vizier
set(0 'metaviz@VIZIR')
----db1_query(0 'metaviz@VIZIR'):
[1755997943]   Select ucdid, name, class, explain From METAucd where ucdid=112
----db1_reset(0 'metaviz@VIZIR')
----db1_query(0 'metaviz@VIZIR'):
[1755997943]   Select ucdid, name, class, explain From METAucd where ucdid=933
----db1_reset(0 'metaviz@VIZIR')
----db1_query(0 'metaviz@VIZIR'):
[1755997943]   Select famid, name, explain From METAfam where famid=769
----db1_reset(0 'metaviz@VIZIR')
----db1_query(0 'metaviz@VIZIR'):
[1755997943]   Select famid, name, explain From METAfam where famid=747
----db1_reset(0 'metaviz@VIZIR')
----inherit(u=used, h=hidden):
     [u] +source=J/ApJ/743/171/2LAC
     [u] -ref=VIZ68aa66f7367682
====inherit(): added 0 hidden fields
----free temporary files
----db1_close(0 'metaviz@VIZIR')
----db1_close(1 'metaviz@VIZIR')
→ Cite/acknowledge VizieR catalogue
→ Rules of usage of VizieR data

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