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J/ApJ/651/61
  Optically thick absorbers near luminous quasars (Hennawi+, 2006)
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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)
  (ALL)recno  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)
   (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)
   (ALL)System (char) (i) System name (SDSS JHHMM+DDMM) (meta.id;meta.main)
  (1)n_System (char) [a-d] Note on System (Note 1)   (meta.note)
  (1)zbg  Background quasar redshift (src.redshift)
  (1)zfg  Foreground quasar redshift (src.redshift)
  (1)Dthe arcsec Angular separation of the quasar pair sight lines (Note 2)   (pos.angDistance)
  (1)R kpc Radius (in (h–1kpc) (phys.size.radius)
  (1)zabs  Absorber redshift (src.redshift)
  (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)

ALL cols
    
 (i)indexed column
  (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)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)n_zfg (char) Emission line that was centered to determine foreground quasar redshift (zfg) (meta.note)
  (1)obs.fg (char) Instrument used to observed foreground quasar (meta.id;instr)
  (1)obs.bg (char) Instrument used to observed background quasar (meta.id;instr)
  (2)Name (char) Quasar name (SDSS JHHMM+DDMM or 2QZ JHHMM+DDMM) (meta.id;meta.main)
  (2)m_Name (char) [A-E] Multiplicity index on Name (Note 1)   (meta.code.multip)
  (2)RAJ2000 "h:m:s" (i) Right ascension (J2000) (pos.eq.ra;meta.main)
  (2)DEJ2000 "d:m:s" (i) Declination (J2000) (pos.eq.dec;meta.main)
  (2)z  Spectroscopic redshift (src.redshift)
  (2)umag mag Extinction-corrected SDSS u magnitude (phot.mag;em.opt.U)
  (2)gmag mag Extinction-corrected SDSS g magnitude (phot.mag;em.opt.B)
  (2)rmag mag Extinction-corrected SDSS r magnitude (phot.mag;em.opt.R)
  (2)imag mag Extinction-corrected SDSS i magnitude (phot.mag;em.opt.I)
  (2)zmag mag Extinction-corrected SDSS z magnitude (phot.mag;em.opt.I)
  (2)SDSS (char) Display the SDSS data for this quasar (meta.ref.url)

ALL cols
    
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