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VII/289
  SDSS quasar catalog, sixteenth data release (DR16Q) (Lyke+, 2020)
ReadMe+ftp
2020ApJS..250....8L
Similar Catalogs
Post annotation 		img(gal)
1.VII/289/dr16q(c)The SDSS quasar-only catalog from DR16 (DR16Q) (original column names in green) (750414 rows)
2.VII/289/superset(c)The "superset" of all SDSS-IV/eBOSS objects targeted as quasars (original column names in green) (1440615 rows)
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Simple ConstraintList Of Constraints
 
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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)SDSS (char) (i) SDSS-DR16 designation (HHMMSS.ss+DDMMSS.s; J2000) (SDSS_NAME) (meta.id;meta.main)
   (ALL)RAJ2000 deg (i) Right Ascension (J2000) (RA) (pos.eq.ra;meta.main)
   (ALL)DEJ2000 deg (i) [-17.53/84.44] Declination (J2000) (DEC) (pos.eq.dec;meta.main)
   (ALL)Plate  Spectroscopic plate number (Note G1)   (obs.field)
   (ALL)MJD  (i) [51608/58543] Spectroscopic Modified Julian Date (Note G1)   (time.epoch)
   (ALL)Fiber  Spectroscopic fiber number (FIBERID) (Note G1)   (meta.number;pos.parallax.spect)
   (ALL)QN (char) Object classification post-QuasarNET (Busca & Balland 2018arXiv180809955B) (AUTOCLASS_PQN) (Note 1)   (meta.code)
   (ALL)DR14Q (char) Object classification based only on the DR14Q algorithm (AUTOCLASS_DR14Q) (meta.code.class;src.class)
   (ALL)QQN  Binary flag for QuasarNET quasar identification (1=QSO; -1=not processed by QuasarNET) (IS_QSO_QN) (meta.code)
   (ALL)zQN  (n) [-0.4/6.51] Redshift derived by QuasarNET (Z_QN) (src.redshift;pos.heliocentric)

ALL cols		    
(n) indicates a possible blank or NULL column(i)indexed column
   (ALL)10K   [0/1] Binary flag indicating objects selected for random visual inspection (0=not selected) (RANDOM_SELECT) (Note G2)   (meta.code)
   (ALL)z10K  (n) [0.1/4.3] Redshift from visual inspection of random set (Z_10K) (src.redshift;pos.heliocentric)
   (ALL)f_z10K   [-1/3] Confidence rating for visual inspection redshift of random set (3:highest confidence) (Z_CONF_10K) (Note G3)   (meta.code)
   (ALL)C10K  Binary flag indicating if the automated pipeline classification and redshift were correct in the random set (PIPE_CORR_10K) (Note G4)   (meta.code)
   (ALL)Q10K  Binary flag for random set quasar identification (1=QSO; -1=not randomly selected) (IS_QSO_10K) (meta.code)
   (ALL)THINGID  (n) SDSS identifier mainly for BOSS and eBOSS objects (THING_ID) (meta.id)
   (ALL)zvis  (n) [0.001/7.02] Redshift from visual inspection (Z_VI) (src.redshift;pos.heliocentric)
   (ALL)f_zvis  (n) [-1/3] Confidence rating for visual inspection redshift (3: highest confidence) (Z_CONF) (meta.code)
   (ALL)Class  (n) [0/50] Object classification from visual inspection (CLASS_PERSON) (Note 2)   (meta.code.class;src.class)
   (ALL)zDR12Q  (n) [0.04/6.5] Redshift taken from DR12Q (Cat. VII/279) visual inspection (Z_DR12Q) (src.redshift;pos.heliocentric)
   (ALL)QDR12Q  Flag indicating if an object was a quasar in DR12Q (1=QSO) (IS_QSO_DR12Q) (meta.code)
   (ALL)zDR7Q  (n) [0.06/5.47] Redshift taken from DR7Q (Cat. VII/260) catalog (Z_DR7Q_SCH) (src.redshift;pos.heliocentric)
   (ALL)QDR7Q  Flag indicating if an object was a quasar in DR7Q (IS_QSO_DR7Q) (meta.code)

ALL cols		    
(n) indicates a possible blank or NULL column(i)indexed column
   (ALL)zDR6Q  (n) [0.07/5.5] Redshift taken from DR6 (Hewett & Wild, 2010, J/MNRAS/405/2302) (Z_DR6Q_HW) (src.redshift;pos.heliocentric)
   (ALL)zDR7Qa  (n) [0.06/5.5] Redshift taken from DR7 (Shen+ 2011, J/ApJS/194/45) catalog ancillary columns (Z_DR7Q_HW) (Note G5)   (src.redshift;pos.heliocentric)
   (ALL)QSO   [1/2] Flag indicating quasars included in final catalog (1=QSO; 2=questionable – see Section 3.6) (IS_QSO_FINAL) (meta.code)
   (ALL)z  (n) [-0.0027/7.03] Best available redshift (src.redshift;pos.heliocentric)
   (ALL)r_z (char) Source for redshift z (SOURCE_Z) (Note 3)   (meta.ref;pos.frame)
   (ALL)zPipe  (n) [-0.0084/7.05] Redshift from SDSS pipeline version v5130 (Z_PIPE) (src.redshift;pos.heliocentric)
   (ALL)q_zPipe   [-1/68] Quality flag on SDSS pipeline redshift estimate (ZWARNING) (G6) Binary flag (Note)   (meta.code.qual)
   (ALL)objID (char) SDSS object identification number (sky version, run, rerun, camera column, field number, and ID) (Note G7)   (meta.id)
   (ALL)zPCA   [-1008/7.3] PCA redshift derived by the redvsblue algorithm (Z_PCA) (src.redshift;pos.heliocentric)
   (ALL)q_zPCA   [0/1056] Warning flag for redvsblue redshift (ZWARN_PCA) (G6) Binary flag (Note)   (meta.code.qual)
   (ALL)Chi2PCA   [7/3.31e+7] Δχ2 for PCA redshift versus cubic continuum fit (DELTACHI2_PCA) (stat.fit.chi2)
   (ALL)zHa  (n) [-0.015/0.53] PCA line redshift for Hα from redvsblue (Z_HALPHA) (src.redshift;pos.heliocentric)
   (ALL)q_zHa   [0/7682] Warning flag for Hα (ZWARN_HALPHA) (G6) Binary flag (Note)   (meta.code.qual)

ALL cols		    
(n) indicates a possible blank or NULL column(i)indexed column
   (ALL)Chi2Ha   [0/2.2e+6] Δχ2 for Hα line redshift versus cubic continuum fit (DELTACHI2_HALPHA) (stat.fit.chi2)
   (ALL)zHb  (n) [-0.02/1.1] PCA line redshift for Hβ from redvsblue (Z_HBETA) (src.redshift;pos.heliocentric)
   (ALL)q_zHb   [0/7682] Warning flag for Hβ (ZWARN_HBETA) (G6) Binary flag (Note)   (meta.code.qual)
   (ALL)Chi2Hb   [0/525536] Δχ2 for Hβ line versus cubic continuum fit (DELTACHI2_HBETA) (stat.fit.chi2)
   (ALL)zMgII  (n) [0.28/2.6] PCA line redshift for MgII from redvsblue (Z_MGII) (src.redshift;pos.heliocentric)
   (ALL)q_zMgII   [0/7682] Warning flag for MgII (ZWARN_MGII) (G6) Binary flag (Note)   (meta.code.qual)
   (ALL)Chi2MgII   [0/384079] Δχ2 for MgII line redshift versus cubic continuum fit (DELTACHI2_MGII) (stat.fit.chi2)
   (ALL)zCIII  (n) [0.8/4.3] PCA line redshift for CIII] from redvsblue (Z_CIII) (src.redshift;pos.heliocentric)
   (ALL)q_zCIII   [0/7682] Warning flag for CIII] (ZWARN_CIII) (G6) Binary flag (Note)   (meta.code.qual)
   (ALL)Chi2CIII   [0/547655] Δχ2 for CIII] line redshift versus cubic continuum fit (DELTACHI2_CIII) (stat.fit.chi2)
   (ALL)zCIV  (n) [1.3/5.5] PCA line redshift for CIV from redvsblue (Z_CIV) (src.redshift;pos.heliocentric)
   (ALL)q_zCIV   [0/7682] Warning flag for CIV (ZWARN_CIV) (G6) Binary flag (Note)   (meta.code.qual)
   (ALL)Chi2CIV   [0/5.5e+6] Δχ2 for CIV line redshift versus cubic continuum fit (DELTACHI2_CIV) (stat.fit.chi2)

ALL cols		    
(n) indicates a possible blank or NULL column(i)indexed column
   (ALL)zLyA  (n) [1.9/7.3] PCA line redshift for Lyα from redvsblue (Z_LYA) (src.redshift;pos.heliocentric)
   (ALL)q_zLyA   [0/7682] Warning flag for Lyα (ZWARN_LYA) (G6) Binary flag (Note)   (meta.code.qual)
   (ALL)Chi2LyA   [0/4.5e+6] Δχ2 for Lyα line redshift versus cubic continuum fit (DELTACHI2_LYA) (stat.fit.chi2)
  (1)zLyaB  (n) [0.03/4] PCA redshift derived from spectra masked blueward of Lyα (Z_LYAWG) (src.redshift;pos.heliocentric)
   (ALL)zDLA1  (n) [1.9/6.2] Redshift for damped Lyα feature 1 (Z_DLA1) (src.redshift;pos.heliocentric)
   (ALL)zDLA2  (n) [2/5.2] Redshift for damped Lyα feature 2 (Z_DLA2) (src.redshift;pos.heliocentric)
   (ALL)zDLA3  (n) [2.1/4.9] Redshift for damped Lyα feature 3 (Z_DLA3) (src.redshift;pos.heliocentric)
   (ALL)zDLA4  (n) [2.4/3.7] Redshift for damped Lyα feature 4 (Z_DLA4) (src.redshift;pos.heliocentric)
   (ALL)zDLA5  (n) [2.8/3.3] Redshift for damped Lyα feature 5 (Z_DLA5) (src.redshift;pos.heliocentric)
   (ALL)NHIDLA1 [-] (n) [20.3/22] Absorber column density for damped Lyα feature 1 (NHI_DLA1) (phys.columnDensity)
   (ALL)NHIDLA2 [-] (n) [20.3/21.8] Absorber column density for damped Lyα feature 2 (NHI_DLA2) (phys.columnDensity)
   (ALL)NHIDLA3 [-] (n) [20.3/21.4] Absorber column density for damped Lyα feature 3 (NHI_DLA3) (phys.columnDensity)
   (ALL)NHIDLA4 [-] (n) [20.3/21.1] Absorber column density for damped Lyα feature 4 (NHI_DLA4) (phys.columnDensity)

ALL cols		    
(n) indicates a possible blank or NULL column(i)indexed column
   (ALL)NHIDLA5 [-] (n) [20.5/20.6] Absorber column density for damped Lyα feature 5 (NHI_DLA5) (phys.columnDensity)
  (1)f_zDLA1  Confidence of detection for damped Lyα feature 1 (CONF_DLA1) (meta.code)
  (1)f_zDLA2  Confidence of detection for damped Lyα features (CONF_DLA2) (meta.code)
  (1)f_zDLA3  Confidence of detection for damped Lyα features (CONF_DLA3) (meta.code)
  (1)f_zDLA4  Confidence of detection for damped Lyα features (CONF_DLA4) (meta.code)
  (1)f_zDLA5  Confidence of detection for damped Lyα features (CONF_DLA5) (meta.code)
   (ALL)PBAL   [-1/1] BAL probability (BAL_PROB) (Note G8)   (stat.fit.goodness)
   (ALL)BI(CIV) km/s (n) [/109061] BALnicity index for the CIV region (BI_CIV) (spect.line.eqWidth)
   (ALL)e_BI(CIV) km/s (n) [0/3.1e+38] BI(CIV) uncertainty (ERR_BI_CIV) (stat.error)
   (ALL)AI(CIV) km/s (n) [-618/121609] Absorption index for the CIV region (AI_CIV) (spect.index)
   (ALL)e_AI(CIV) km/s (n) [0/10897] AI(CIV) uncertainty (ERR_AI_CIV) (stat.error)
   (ALL)BI(SIIV) km/s (n) [/85220] BALnicity index for the SiIV region (BI_SIIV) (spect.line.eqWidth)
   (ALL)e_BI(SIIV) km/s (n) [0/1985] BI(SIIV) uncertainty (ERR_BI_SIIV) (stat.error)

ALL cols		    
(n) indicates a possible blank or NULL column(i)indexed column
   (ALL)AI(SIIV) km/s (n) [/45671] Absorption index for the SiIV region (AI_SIIV) (spect.index)
   (ALL)e_AI(SIIV) km/s (n) [0/1622] AI(SIIV) uncertainty (ERR_AI_SIIV) (stat.error)
   (ALL)Btarg1  BOSS target selection flag for the main survey (BOSS_TARGET1) Binary flag (meta.code)
   (ALL)eBOSST0  eBOSS target selection flag for the pilot survey (SEQUELS) (EBOSS_TARGET0) Binary flag (meta.code)
   (ALL)eBOSST1  eBOSS target selection flag for the main survey (EBOSS_TARGET1) Binary flag (meta.code)
   (ALL)eBOSST2  eBOSS target 2 selection flag for the main survey (EBOSS_TARGET2) Binary flag (meta.code)
   (ALL)Atarg1  BOSS target selection flag for the ancillary surveys (ANCILLARY_TARGET1) Binary flag (meta.code)
   (ALL)Atarg2  BOSS target 2 selection flag for the ancillary surveys (ANCILLARY_TARGET2) (meta.code)
   (ALL)NspI   [0/1] Number of additional spectra from SDSS-I/II (NSPEC_SDSS) (Note G9)   (meta.number)
   (ALL)NspBOSS   [0/73] Number of additional spectra from BOSS/eBOSS (NSPEC_BOSS) (Note G9)   (meta.number)
   (ALL)Nsp   [0/73] Total number of additional spectra (NSPEC) (Note G9)   (meta.number)
   (ALL)Sky  (n) [2] SDSS photometric sky version number (SKYVERSION) (meta.number)
   (ALL)Run  (n) [94/8162] SDSS imaging run number of photometric measurements (RUN_NUMBER) (meta.id)

ALL cols		    
(n) indicates a possible blank or NULL column(i)indexed column
   (ALL)Rerun  (n) [157/301] SDSS photometric processing rerun number (RERUN_NUMBER) (meta.id)
   (ALL)Cam  (n) [1/6] SDSS camera column number (CAMCOL_NUMBER) (meta.id)
   (ALL)Field  (n) [11/872] SDSS field number (FIELD_NUMBER) (meta.id;obs.field)
   (ALL)photID  (n) [2/4093] SDSS photometric ID (ID_NUMBER) (meta.id;phot)
   (ALL)lambda 0.1nm [4000/7500] Wavelength for which the fiber placement was optimized to account for atmospheric differential refraction (Dawson+ 2013AJ....145...10D), in Å (LAMBDA_EFF) (em.wl)
   (ALL)Offset um [0/300] Backstopping offset distance (ZOFFSET) (pos.distance;instr.offset;arith.diff)
   (ALL)Xfocal mm [-325/325] Hole x-axis position in focal plane (pos.cartesian.x;instr.plate)
   (ALL)Yfocal mm [-325/326] Hole y-axis position in focal plane (pos.cartesian.y;instr.plate)
   (ALL)Chunk (char) Name of tiling chunk (from the plate-list product) (obs.field)
   (ALL)Tile   [-3/17691] Tile number (obs.field)
   (ALL)SN2   [0/334] Overall (S/N)2 measure for plate, minimum of all four cameras (PLATESN2) (stat.snr)
   (ALL)Fu 3.63uJy (n) [-45/2001] PSF flux in u-band in nMgy (not corrected for Galactic extinction) (PSFFLUXu) (phot.mag;em.opt.U)
   (ALL)Fg 3.63uJy (n) [-0.3/1756] PSF flux in g-band in nMgy (not corrected for Galactic extinction) (PSFFLUXg) (phot.mag;em.opt.B)

ALL cols		    
(n) indicates a possible blank or NULL column(i)indexed column
   (ALL)Fr 3.63uJy (n) [-0.6/1646] PSF flux in r-band in nMgy (not corrected for Galactic extinction) (PSFFLUXr) (phot.mag;em.opt.R)
   (ALL)Fi 3.63uJy (n) [-31/2324] PSF flux in i-band in nMgy (not corrected for Galactic extinction) (PSFFLUXi) (phot.mag;em.opt.I)
   (ALL)Fz 3.63uJy (n) [-3.2/1777] PSF flux in z-band in nMgy (not corrected for Galactic extinction) (PSFFLUXz) (phot.mag;em.opt.I)
   (ALL)IVFu 3.63uJy (n) [0/233] Inverse variance of Fu in nMgy (PSFFLUX_IVARu) (phot.mag;em.opt.U)
   (ALL)IVFg 3.63uJy (n) [0/643] Inverse variance of Fg in nMgy (PSFFLUX_IVARg) (phot.mag;em.opt.B)
   (ALL)IVFr 3.63uJy (n) [0/160] Inverse variance of Fr in nMgy (PSFFLUX_IVARr) (phot.mag;em.opt.R)
   (ALL)IVFi 3.63uJy (n) [0/74] Inverse variance of Fi in nMgy (PSFFLUX_IVARi) (phot.mag;em.opt.I)
   (ALL)IVFz 3.63uJy (n) [0/9] Inverse variance of Fz in nMgy (PSFFLUX_IVARz) (phot.mag;em.opt.I)
   (ALL)umag mag (n) [14.2/31] PSF (AB) magnitude in u band (not corrected for Galactic extinction) (PSFMAGu) (phot.mag;em.opt.U)
   (ALL)gmag mag (n) [14.3/26.4] PSF (AB) magnitude in g band (not corrected for Galactic extinction) (PSFMAGg) (phot.mag;em.opt.B)
   (ALL)rmag mag (n) [14.4/26.6] PSF (AB) magnitude in r band (not corrected for Galactic extinction) (PSFMAGr) (phot.mag;em.opt.R)
   (ALL)imag mag (n) [14/30] PSF (AB) magnitude in i band (not corrected for Galactic extinction) (PSFMAGi) (phot.mag;em.opt.I)
   (ALL)zmag mag (n) [14.3/24.5] PSF (AB) magnitude in z band (not corrected for Galactic extinction) (PSFMAGz) (src.redshift;pos.heliocentric)

ALL cols		    
(n) indicates a possible blank or NULL column(i)indexed column
   (ALL)e_umag mag (n) [0.007/2.7e+6] umag uncertainty (PSFMAGERRu) (stat.error;phot.mag)
   (ALL)e_gmag mag (n) [0.007/38] gmag uncertainty (PSFMAGERRg) (stat.error;phot.mag)
   (ALL)e_rmag mag (n) [0.005/26] rmag uncertainty (PSFMAGERRr) (stat.error;phot.mag)
   (ALL)e_imag mag (n) [0.006/2.4e+6] imag uncertainty (PSFMAGERRi) (stat.error;phot.mag)
   (ALL)e_zmag mag (n) [0.008/114] zmag uncertainty (PSFMAGERRz) (stat.error;phot.mag)
   (ALL)Extu mag (n) [0.009/3.8] Galactic extinction in the u-band from Schlafly & Finkbeiner (2011ApJ...737..103S) (EXTINCTIONu) (phys.absorption)
   (ALL)Extg mag (n) [0.007/2.8] Galactic extinction in the g-band from Schlafly & Finkbeiner (2011ApJ...737..103S) (EXTINCTIONg) (phys.absorption)
   (ALL)Extr mag (n) [0.005/2.1] Galactic extinction in the r-band from Schlafly & Finkbeiner (2011ApJ...737..103S) (EXTINCTIONr) (phys.absorption)
   (ALL)Exti mag (n) [0.003/1.6] Galactic extinction in the i-band from Schlafly & Finkbeiner (2011ApJ...737..103S) (EXTINCTIONi) (phys.absorption)
   (ALL)Extz mag (n) [0.002/1.1] Galactic extinction in the z-band from Schlafly & Finkbeiner (2011ApJ...737..103S) (EXTINCTIONz) (phys.absorption)
  (1)iMAG mag [-31.4/2] Absolute i-band magnitude, Mi[z=2] using zPCA redshift, corrected for extinction (M_I) (Note 4)   (phys.magAbs)
   (ALL)SNR   [-1.6/77] S/N median value for all good pixels in the five bands (SN_MEDIAN_ALL) (stat.snr)
  (1)GALEX  GALEX matching flag (1=match) (GALEX_MATCHED) (meta.code)

ALL cols		    
(n) indicates a possible blank or NULL column(i)indexed column
  (1)FFUV 3.63uJy [-1.4/1318] FUV flux for GALEX in nMgy (FUV) (phot.flux;em.UV)
  (1)IVFUV 3.63uJy [-1/68408] Inverse variance of FFUV in nMgy (FUV_IVAR) (phot.flux;em.UV)
  (1)FNUV 3.63uJy [-1.3/1235] NUV flux for GALEX in nMgy (NUV) (phot.flux;em.UV)
  (1)IVNUV 3.63uJy Inverse variance of the NUV flux in nMgy (NUV_IVAR) (phot.flux;em.UV)
  (1)UKIDSS  UKIDSS DR8 matching flag (UKIDSS_MATCHED) (meta.code)
  (1)FY W/m2/Hz (n) [-5e-30/1.2e-29] Y-band flux density from UKIDSS (YFLUX) (phot.flux.density;em.IR)
  (1)e_FY W/m2/Hz (n) [5.8e-33/6.7e-30] FY uncertainty (YFLUX_ERR) (stat.error)
  (1)FJ W/m2/Hz (n) J-band flux density from UKIDSS (JFLUX) (phot.flux.density;em.IR.J)
  (1)e_FJ W/m2/Hz (n) FJ uncertainty (JFLUX_ERR) (stat.error)
  (1)FH W/m2/Hz (n) H-band flux density from UKIDSS (HFLUX) (phot.flux.density;em.IR.H)
  (1)e_FH W/m2/Hz (n) FH uncertainty (HFLUX_ERR) (stat.error)
  (1)FK W/m2/Hz (n) K-band flux density from UKIDSS (KFLUX) (phot.mag;em.IR.K)
  (1)e_FK W/m2/Hz (n) FK uncertainty (KFLUX_ERR) (stat.error)

ALL cols		    
(n) indicates a possible blank or NULL column(i)indexed column
  (1)FW1 309.05nJy [-84770/197356] WISE flux in the W1 band (3.4um; Vega, nanomaggies) (W1_FLUX) (Note 5)   (phot.mag;em.IR.3-4um)
  (1)IVW1 309.05nJy-2(n) [4.5e-6/0.14] Inverse variance of FW1 (Vega, nanomaggies–2) (W1_FLUX_IVAR) (phot.mag;em.IR.3-4um)
  (1)W1mag mag (n) [9.2/31.2] WISE W1-band magnitude (Vega) (W1_MAG) (phot.mag;em.IR.3-4um)
  (1)e_W1mag mag (n) [0.0001/52540] W1mag uncertainty (W1_MAG_ERR) (stat.error;phot.mag)
  (1)Chi2W1   [-1/1.2e+6] Profile-weighted ξ2 for the W1 band (W1_CHI2) (stat.fit.chi2)
  (1)SNFW1   [-5564/14926] Signal-to-noise ratio for the W1 band from the flux and inverse variance (W1_FLUX_SNR) (stat.snr)
  (1)fracW1   [-1/1] Fraction of source in profile-weighted fit (W1_SRC_FRAC) (stat.fit.omc)
  (1)ExtFW1   [-12060/6841] Amount of flux added to the profile by nearby sources (W1_EXT_FLUX) (stat.fit.omc)
  (1)ExtW1   [-205/2488] Fraction of profile flux from nearby sources (W1_EXT_FRAC) (stat.fit.omc)
  (1)NW1   [-1/3817] Number of pixels included in the profile fit (W1_NPIX) (meta.number)
  (1)FW2 167.66nJy [-127664/527681] WISE flux in the W2 band (4.6um; Vega, nanomaggies) (W2_FLUX) (phot.mag;em.IR.4-8um)
  (1)IVW2 167.66nJy-2(n) [0/0.011] Inverse variance of FW2 (Vega, nanomaggies–2) (W2_FLUX_IVAR) (phot.mag;em.IR.4-8um)
  (1)W2mag mag (n) [8.1/31.4] WISE W2-band magnitude (Vega) (W2_MAG) (phot.mag;em.IR.4-8um)

ALL cols		    
(n) indicates a possible blank or NULL column(i)indexed column
  (1)e_W2mag mag (n) [0.0002/245404] W2mag uncertainty (W2_MAG_ERR) (stat.error;phot.mag)
  (1)Chi2W2   [-1/114995] Profile-weighted ξ2 for the W2 band (W2_CHI2) (stat.fit.chi2)
  (1)SNFW2   [-2241/6734] Signal-to-noise ratio for the W2 band from flux and inverse variance (W2_FLUX_SNR) (stat.snr)
  (1)fracW2   [-1/1] Fraction of source in the profile-weighted fit (W2_SRC_FRAC) (stat.fit.omc)
  (1)ExtFW2   [-9089/6580] Amount of flux added to the profile by nearby sources (W2_EXT_FLUX) (stat.fit.omc)
  (1)ExtW2   [-9.7/12145] Fraction of profile flux from nearby sources (W2_EXT_FRAC) (stat.fit.omc)
  (1)NW2   [-1/3306] Number of pixels included in the profile fit (W2_NPIX) (meta.number)
  (1)FIRST  Matching flag for FIRST (FIRST_MATCHED) (meta.code)
  (1)F1.4p mJy (n) [0.75/14775] FIRST peak flux density at 20cm (FIRST_FLUX) (phot.flux.density;em.radio.750-1500MHz)
  (1)SNF  (n) [5/21190] FIRST flux density S/N (FIRST_SNR) (stat.snr)
  (1)SepF arcsec (n) [/2] SDSS-FIRST separation (SDSS2FIRST_SEP) (pos;arith.diff)
  (1)Jmag mag (n) [13/19] 2MASS (Vega) J-band magnitude (phot.mag;em.IR.J)
  (1)e_Jmag mag (n) [0.018/3] Jmag uncertainty (JMAG_ERR) (stat.error;phot.mag)

ALL cols		    
(n) indicates a possible blank or NULL column(i)indexed column
  (1)SNRJ  (n) [2.9/215] 2MASS J-band S/N (JSNR) (stat.snr)
  (1)f_Jmag   [-1/6] 2MASS J-band photometry flag (JRDFLAG) (meta.code)
  (1)Hmag mag (n) [12.2/18.2] 2MASS (Vega) H-band magnitude (phot.mag;em.IR.H)
  (1)e_Hmag mag (n) [0.015/0.6] Hmag uncertainty (HMAG_ERR) (stat.error;phot.mag)
  (1)SNRH  (n) [1.9/213] 2MASS H-band S/N (HSNR) (stat.snr)
  (1)f_Hmag  2MASS H-band photometry flag (HRDFLAG) (meta.code)
  (1)Kmag mag (n) [11.3/17.7] 2MASS (Vega) K-band magnitude (phot.mag;em.IR.K)
  (1)e_Kmag mag (n) [0.017/1] Kmag uncertainty (KMAG_ERR) (stat.error;phot.mag)
  (1)SNRK  (n) [2.2/259] 2MASS K-band S/N (KSNR) (stat.snr)
  (1)f_Kmag  2MASS K-band photometry flag (KRDFLAG) (meta.code)
  (1)Sep2M arcsec (n) [0.002/2] SDSS-2MASS separation (SDSS2MASS_SEP) (pos;arith.diff)
  (1)2RXS (char) 2nd ROSAT identifier ( 2RXS_ID) (meta.id.cross)
  (1)RARdeg deg (n) Right ascension of the ROSAT source (J2000) ( 2RXS_RA) (pos.eq.ra)

ALL cols		    
(n) indicates a possible blank or NULL column(i)indexed column
  (1)DERdeg deg (n) Declination of the ROSAT source (J2000) ( 2RXS_DEC) (pos.eq.dec)
  (1)F0.5-2 mW/m2 (n) [1e-13/5.6e-11] ROSAT source flux in the 0.5-2.0keV band in erg/s/cm2 ( 2RXSSRCFLUX) (phot.flux;em.X-ray.soft)
  (1)e_F0.5-2 mW/m2 (n) [0/3.6e-12] F0.5-2 uncertainty ( 2RXSSRCFLUX_ERR) (stat.error)
  (1)SepRX arcsec (n) [0.12/97.4] SDSS-ROSAT separation (SDSS2ROSAT_SEP) (pos;arith.diff)
  (1)XMM  (n) XMM source number (XMM_SRC_ID) (meta.id.cross)
  (1)RAXdeg deg (n) XMM right ascension (J2000) (XMM_RA) (pos.eq.ra)
  (1)DEXdeg deg (n) XMM declination (J2000) (XMM_DEC) (pos.eq.dec)
  (1)F0.2-2 mW/m2 (n) [0/6.4e-12] XMM soft (0.2-2.0keV) X-ray flux in erg/s/cm2 (XMM_SOFT_FLUX) (phot.flux;em.X-ray)
  (1)e_F0.2-2 mW/m2 (n) [5.2e-17/5e-14] F0.2-2 uncertainty (XMM_SOFT_FLUX_ERR) (stat.error)
  (1)F2-12 mW/m2 (n) [0/8.6e-12] XMM hard (2.0-12.0keV) X-ray flux in erg/s/cm2 (XMM_HARD_FLUX) (phot.flux;em.X-ray)
  (1)e_F2-12 mW/m2 (n) [3.5e-16/3.3e-13] F2-12 uncertainty (XMM_HARD_FLUX_ERR) (stat.error)
  (1)F0.2-12 mW/m2 (n) [1.8e-15/1.5e-11] XMM total (0.2-12.0keV) X-ray flux in erg/s/cm2 (XMM_TOTAL_FLUX) (phot.flux;em.X-ray)
  (1)e_F0.2-12 mW/m2 (n) [5.5e-16/4.7e-13] F0.2-12 uncertainty (XMM_TOTAL_FLUX_ERR) (stat.error)

ALL cols		    
(n) indicates a possible blank or NULL column(i)indexed column
  (1)SepXM arcsec (n) [0.0026/12] SDSS-XMM-Newton separation (SDSS2XMM_SEP) (pos;arith.diff)
  (1)MatchG   [0/1] Gaia matching flag (GAIA_MATCHED) (meta.code)
  (1)Gaia  (n) Gaia DR2 identifier (GAIA_DESIGNATION) (meta.id.cross)
  (1)RAGdeg deg (n) Gaia barycentric right ascension (J2015.5) (GAIA_RA) (pos.eq.ra)
  (1)DEGdeg deg (n) Gaia barycentric declination (J2015.5) (GAIA_DEC) (pos.eq.dec)
  (1)Plx mas [-25.2/14] Gaia absolute stellar parallax (J2015.5) (GAIA_PARALLAX) (pos.parallax)
  (1)e_Plx mas (n) [0/1415] Plx uncertainty (GAIA_PARALLAX_ERR) (stat.error;pos.parallax)
  (1)pmRA mas/yr [-42/38.3] Gaia proper motion in RA (J2015.5) (GAIA_PM_RA) (pos.pm;pos.eq.ra)
  (1)e_pmRA mas/yr (n) [0/763] pmRA uncertainty (GAIA_PM_RA_ERR) (stat.error;pos.pm;pos.eq.ra)
  (1)pmDE mas/yr [-40.1/43.3] Gaia proper motion in DEC (J2015.5) (GAIA_PM_DEC) (pos.pm;pos.eq.dec)
  (1)e_pmDE mas/yr (n) [0/725] pmDE uncertainty (GAIA_PM_DEC_ERR) (stat.error;pos.pm;pos.eq.dec)
  (1)Gmag mag (n) [14.6/22] Gaia mean magnitude in the G band (Vega) (GAIA_G_MAG) (phot.mag;em.opt)
  (1)SNG  (n) [5/1805] Mean flux over the standard deviation in the (Vega) G band (GAIA_G_FLUX_SNR) (stat.snr)

ALL cols		    
(n) indicates a possible blank or NULL column(i)indexed column
  (1)BPmag mag (n) [0/23.6] Gaia mean magnitude in the (Vega) BP band (GAIA_BP_MAG) (phot.mag;em.opt.B)
  (1)SNBP  (n) [0/9423] Mean flux over the standard deviation in the (Vega) BP band (GAIA_BP_FLUX_SNR) (stat.snr)
  (1)RPmag mag (n) [0/23.2] Gaia mean magnitude in the (Vega) RP band (GAIA_RP_MAG) (phot.mag;em.opt.R)
  (1)SNRP  (n) [0/39131] Mean flux over the standard deviation in the (Vega) RP band (GAIA_RP_FLUX_SNR) (stat.snr)
  (1)SepG arcsec (n) [0.0001/0.5] SDSS-Gaia separation (SDSS2GAIA_SEP) (pos;arith.diff)
   (ALL)Sp (char) Display the SDSS data for this quasar (meta.ref.url)
  (1)Simbad (char) ask the Simbad data-base about this object (meta.ref.url)
  (2)DR16Q  (n)Source is included in SDSS quasar-only catalog (meta.ref.url)
  (2)Prim   [0/1] Flag to indicate if observation is primary observation appearing in DR16Q or a duplicate (1=Primary) (PRIM_REC) (meta.code)
  (2)q_zDLA1  Confidence of detection for damped Lyα feature 1 (CONF_DLA1) Binary flag (meta.code.qual)
  (2)q_zDLA2  Confidence of detection for damped Lyα features (CONF_DLA2) Binary flag (meta.code.qual)
  (2)q_zDLA3  Confidence of detection for damped Lyα features (CONF_DLA3) Binary flag (meta.code.qual)
  (2)q_zDLA4  Confidence of detection for damped Lyα features (CONF_DLA4) Binary flag (meta.code.qual)

ALL cols		    
(n) indicates a possible blank or NULL column(i)indexed column
  (2)q_zDLA5  Confidence of detection for damped Lyα features (CONF_DLA5) Binary flag (meta.code.qual)

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