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Simple TargetList Of TargetsFast Xmatch with large catalogs or Simbad
Target Name (resolved by Sesame) or Position:
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NB: The epoch used for the query is the original epoch of the table(s)Radius Box size

  
J/ApJ/651/61
  Optically thick absorbers near luminous quasars (Hennawi+, 2006)
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img(gal)
1.J/ApJ/651/61/ALSConfirmed or Tentative optically thick absorption-line systems near foreground quasars (35 rows)
2.J/ApJ/651/61/photom(c)Coordinates and photometry for projected quasar pairs in tables 1 and 2 (71 rows)

 
Query by Constraints constraints help applied on Columns (Output Order: + - )
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Column  Constraint Explain   (UCD)
  (1)Dthe arcsec Angular separation of the quasar pair sight lines (Note 2)   (pos.angDistance)
  (1)|DV| km/s Velocity difference between the absorber redshift and our best estimate of the redshift of the foreground quasar (phys.veloc;arith.diff)
  (1)DVfg km/s Estimated error on the foreground quasar redshift (stat.error)
  (1)e_logNHI [cm-2] (n) rms uncertainty on logNHI (stat.error)
  (1)gUV  Maximum enhancement of the quasar's ionizing photon flux over that of the extragalactic ionizing background, at the location of the background quasar sight line, assuming that gUV=1+FQSO/FUVB the quasar emission is isotropic (phot.flux;arith.ratio)
  (1)l_logNHI (char) Limit flag on logNHI (meta.code.error)
  (1)logNHI [cm-2] (n) Column density of the absorber from our fit to the HI profile (stat.weight)
  (1)n_System (char) [a-d] Note on System (Note 1)   (meta.note)
  (1)n_zfg (char) Emission line that was centered to determine foreground quasar redshift (zfg) (meta.note)
  (1)obs.bg (char) Instrument used to observed background quasar (meta.id;instr)
  (1)obs.fg (char) Instrument used to observed foreground quasar (meta.id;instr)

ALL cols
    
(n) indicates a possible blank or NULL column(i)indexed column
  (1)R kpc Radius (in (h–1kpc) (phys.size.radius)
  (ALL)recno  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)
   (ALL)System (char) (i) System name (SDSS JHHMM+DDMM) (meta.id;meta.main)
   (ALL)Type (char) O for Opticaly thick assorption-line system, or t for Tentative opticaly thick assorption-line systems, a for the five quasars on system J0127+1507 (meta.code)
  (1)zabs  Absorber redshift (src.redshift)
  (1)zbg  Background quasar redshift (src.redshift)
  (1)zfg  Foreground quasar redshift (src.redshift)
  (2)DEJ2000 "d:m:s" (i) Declination (J2000) (pos.eq.dec;meta.main)
  (2)gmag mag Extinction-corrected SDSS g magnitude (phot.mag;em.opt.B)
  (2)imag mag Extinction-corrected SDSS i magnitude (phot.mag;em.opt.I)
  (2)m_Name (char) [A-E] Multiplicity index on Name (Note 1)   (meta.code.multip)
  (2)Name (char) Quasar name (SDSS JHHMM+DDMM or 2QZ JHHMM+DDMM) (meta.id;meta.main)
  (2)RAJ2000 "h:m:s" (i) Right ascension (J2000) (pos.eq.ra;meta.main)
  (2)rmag mag Extinction-corrected SDSS r magnitude (phot.mag;em.opt.R)
  (2)SDSS (char) Display the SDSS data for this quasar (meta.ref.url)
  (2)umag mag Extinction-corrected SDSS u magnitude (phot.mag;em.opt.U)
  (2)z  Spectroscopic redshift (src.redshift)
  (2)zmag mag Extinction-corrected SDSS z magnitude (phot.mag;em.opt.I)

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