Sloan Digital Sky Survey Quasar Catalog (Twelfth Data Release: DR12Q)

Sloan Digital Sky Survey Quasar Catalog (Twelfth Data Release: DR12Q) SDSS(QSO) ivo://nasa.heasarc/sdssquasar NASA/GSFC HEASARC Paris et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Quasar This table contains the Data Release 12 Quasar Catalog (DR12Q) from the Baryon Oscillation Spectroscopic Survey (BOSS) of the Sloan Digital Sky Survey III (SDSS-III). This catalog includes all SDSS-III/BOSS objects that were spectroscopically targeted as quasar candidates during the full survey and that are confirmed as quasars via visual inspection of the spectra, have luminosities M_i_[z=2] < -20.5 (in a LambdaCDM cosmology with H0 = 70 km/s/Mpc, OmegaM = 0.3, and OmegaLambda = 0.7), and either display at least one emission line with a full width at half maximum (FWHM) larger than 500 km/s or, if not, have interesting/complex absorption features. The catalog also includes previously known quasars (mostly from SDSS-I and II) that were re-observed by BOSS. The catalog contains 297,301 quasars (272,026 are new discoveries since the beginning of SDSS-III) detected over 9376 deg2 with robust identification and redshift measured by a combination of principal component eigenspectra. The number of quasars with z > 2.15 (184,101, of which 167,742 are new discoveries) is about an order of magnitude greater than the number of z > 2.15 quasars known prior to BOSS. Redshifts and FWHMs are provided for the strongest emission lines (C IV, C III], Mg II). The catalog identifies 29,580 broad absorption line quasars and their characteristics are listed in the file dr12qbal.dat that is available at the CDS (<a href="http://cdsarc.u-strasbg.fr/ftp/cats/VII/279/">http://cdsarc.u-strasbg.fr/ftp/cats/VII/279/</a>). For each object, the catalog presents five-band (u, g, r, i, z) CCD-based photometry with typical accuracy of 0.03 mag together with some information on the optical morphology and the selection criteria. When available, the catalog also provides information on the optical variability of quasars using SDSS and Palomar Transient Factory multi-epoch photometry. The catalog also contains X-ray, ultraviolet, near-infrared, and radio emission properties of the quasars, when available, from other large-area surveys. The calibrated digital spectra, covering the wavelength region 3600-10,500 Angstrom at a spectral resolution in the range 1300 < R < 2500, can be retrieved from the SDSS Catalog Archive Server at <a href="http://www.sdss.org/dr12/data_access/">http://www.sdss.org/dr12/data_access/</a>. In their paper, the authors also provide a supplemental list of an additional 4,841 quasars that have been identified serendipitously outside of the superset defined to derive the main quasar catalog, available as the file dr12qsp.dat that is available at the CDS (<a href="http://cdsarc.u-strasbg.fr/ftp/cats/VII/279/">http://cdsarc.u-strasbg.fr/ftp/cats/VII/279/</a>). This table contains the final quasar catalog of the SDSS-III/BOSS survey resulting from five years of observations. The catalog, which the authors call "DR12Q", contains 297,301 quasars, 184,101 of which have z > 2.15. the authors provide robust identification from visual inspection and refined redshift measurements based on the result of a principal component analysis of the spectra. The present catalog contains about 80% more quasars than their previous release (Paris et al., 2014, "DR10Q", <a href="https://cdsarc.cds.unistra.fr/ftp/cats/VII/270">CDS Cat. VII/270</a>). In SDSS-III, all fluxes in the 5 SDSS bands (u, g, r, i and z) are expressed in terms of "nanomaggies" (nMgy), which are a convenient linear unit. These quantities are related to standard AB magnitudes thus: an object with a flux F given in nMgy has a Pogson magnitude (on the AB scale) m = [22.5 mag] - 2.5*log10(F). A flux of 1 Mgy is therefore close to 3631 Jy, and 1 nMgy = ~3.631 uJy (µJy). This table was updated to DR12Q in July 2017 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/VII/279">CDS Catalog VII/279</a> file dr12q.dat. This is a service provided by NASA HEASARC . 2017A&A...597A..79P https://heasarc.gsfc.nasa.gov/W3Browse/all/sdssquasar.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=sdssquasar& GET text/xml 180 99999 true 357.713124 -10.991653 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=sdssquasar GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_sdssquasar&Action=More+Options&Action=Parameter+Search&ConeAdd=1 GALAXY CATALOG 0.0166666666666667 Optical public sdssquasar Sloan Digital Sky Survey Quasar Catalog (Twelfth Data Release: D name SDSS-DR12 Source Designation, Corrected by CDS (SDSS JHHMMSS.ss+DDMMSS.s) meta.id;meta.main char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable vi_redshift Redshift from Visual Inspection src.redshift double nullable rmag PSF Magnitude in r Band (Not Corrected for Galactic Extinction) mag phot.mag;em.opt.R double nullable rmag_error Error in PSF Magnitude in r Band mag stat.error;phot.mag;em.opt.R double nullable gmag PSF Magnitude in g Band (Not Corrected for Galactic Extinction) mag phot.mag;em.opt double nullable gmag_error Error in PSF Magnitude in g Band mag stat.error;phot.mag;em.opt double nullable abs_imag Absolute i Magnitude mag phys.magAbs;em.opt.I double nullable xmm_best_fb_flux Total Flux (0.2-12keV) from XMM-Newton Computed from the Longest Observation erg/s/cm^2 phot.flux;em.X-ray double nullable xmm_best_fb_lx Total X-Ray Luminosity (0.2-12keV) from XMM-Newton Using the Longest Observation erg/s phys.luminosity;em.X-ray double nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable "__row" System index column char nullable ukidss_flux_y_band_error Error in Y-Band Density Flux from UKIDSS W/m^2/Hz stat.error;phot.flux;em.IR.J double nullable number_boss_spectra Number of Additional Spectra Available in SDSS-III/BOSS meta.number short nullable spect_date SDSS Spectroscopic Date mjd time.start;obs;spect int nullable mg_ii_blue_hwhm Blue HWHM of MgII Emission Line km/s spect.line.width;em.UV double nullable pipeline_redshift Redshift from BOSS Pipeline src.redshift double nullable c_iv_troughs_450_num Number of Distinct CIV Troughs of Width Larger Than 450 km/s meta.number short nullable target_flux_u_band Target Flux in the u Band (Not Corrected for Galactic Extinction) in nanomaggies nmaggy phot.flux.density;em.opt.U double nullable c_iv_amplitude Amplitude of CIV Emission Line in Units of Median RMS Pixel Noise spect.line.strength;em.UV double nullable c_iv_fwhm FWHM of CIV Emission Line km/s spect.line.width;em.UV double nullable c_iv_rf_ew Rest Frame Equivalent Width of CIV Emission line in {AA} Angstrom spect.line.eqWidth;em.UV double nullable pca_continuum_quality Estimator of the PCA Continuum Quality meta.code.qual;obs;spect double nullable imaging_date Date of Imaging Observation mjd time.start;obs;phot int nullable target_flux_r_band Target Flux in the r Band (Not Corrected for Galactic Extinction) in nanomaggies nmaggy phot.flux.density;em.opt.R double nullable kmag_flag K-Band Photometry Flag meta.code;phot.mag;em.IR.K short nullable flux_g_band_iv Inverse Variance of PSF Flux in g Band in nanomaggies nmaggy stat.variance;phot.flux.density;em.opt.B double nullable wise_w1_snr Signal-to-Noise Ratio in W1 Band stat.snr;phot.mag;em.IR.3-4um double nullable wise_w3_mag_error Error in W3 Magnitude mag stat.error;phot.mag;em.IR.8-15um double nullable bii Galactic Latitude degree pos.galactic.lat double nullable xmm_best_sb_flux Soft (0.2-2keV) X-Ray Flux from XMM-Newton erg/s/cm^2 phot.flux;em.X-ray.soft double nullable umag PSF Magnitude in u Band (Not Corrected for Galactic Extinction) mag phot.mag;em.opt.U double nullable sf_gal_ext_g_band Recalculated Galactic Extinction in g mag phys.absorption;em.opt.B double nullable xmm_mean_fb_flux_error Error in Total Flux (0.2-12keV) from XMM-Newton erg/s/cm^2 stat.error;phot.flux;em.X-ray double nullable var_flag Flag for Variability Information (0 If Not Available) meta.code;src.var short nullable hmag_snr H-Band Signal-to-Noise Ratio stat.snr;phot.mag;em.IR.H double nullable mg_ii_fwhm FWHM of MgII Emission Line km/s spect.line.width;em.UV double nullable mg_ii_red_hwhm Red HWHM of MgII Emission Line km/s spect.line.width;em.UV double nullable field_number SDSS Field Number meta.id;obs.field short nullable wise_w4_mag WISE W4 Magnitude (Vega) mag phot.mag;em.IR.15-30um double nullable c_iii_rf_ew Rest Frame Equivalent Width of CIII Emission Line Angstrom spect.line.eqWidth;em.UV double nullable c_iv_trough_ai_error Error in the Absorption Index of CIV Trough km/s stat.error;obs;spect double nullable c_iv_troughs_450_min_vel Minimum Velocity of the CIV Troughs km/s spect.line.broad;em.UV double nullable sf_gal_ext_z_band Recalculated Galactic Extinction in z mag phys.absorption;em.opt double nullable jmag 2MASS J Magnitude (Vega) mag phot.mag;em.IR.J double nullable rass_log_count_rate Logarithm RASS Full Band Count Rate log(ct/s) phot.count;em.X-ray.soft double nullable wise_w4_chi2 Chi^2 in W4 Band stat.fit.chi2;phot.mag;em.IR.15-30um double nullable umag_error Error in PSF Magnitude in u Band mag stat.error;phot.mag;em.opt.U double nullable flux_g_band PSF Flux in g Band (Not Corrected for Galactic Extinction) in nanomaggies nmaggy phot.flux.density;em.opt.B double nullable spect_plate_number SDSS Spectroscopic Plate Number meta.id;instr.plate short nullable sf_gal_ext_r_band Recalculated Galactic Extinction in r mag phys.absorption;em.opt.R double nullable ukidss_flux_y_band Y-Band Flux Density from UKIDSS W/m^2/Hz phot.flux;em.IR.J double nullable eboss_ts_flag Target Selection Flag for the SDSS-IV/eBOSS Pilot Survey meta.code;phot char nullable sdss_2mass_offset SDSS-2MASS Separation arcsec pos.angDistance;em.opt;em.IR double nullable xmm_best_hb_lx Hard (4.5-12keV) X-Ray Luminosity from XMM-Newton erg/s phys.luminosity;em.X-ray.medium double nullable sdss_first_offset SDSS-FIRST Separation arcsec pos.angDistance;em.opt;em.radio.750-1500MHz double nullable c_iv_troughs_450_max_vel Maximum Velocity of the CIV Troughs km/s spect.line.broad;em.UV double nullable c_iv_trough_ai Absorption Index of CIV Trough km/s meta.code;obs;spect double nullable flux_r_band_iv Inverse Variance of PSF Flux in r Band in nanomaggies nmaggy stat.variance;phot.flux.density;em.opt.R double nullable flux_r_band PSF Flux in r Band (Not Corrected for Galactic Extinction) in nanomaggies nmaggy phot.flux.density;em.opt.R double nullable thing_id Unique Identifier of SDSS Source meta.id int nullable gi_color_offset Delta(g-i)=(g-i)-<(g-i)>_redshift_ (Galactic Extinction Corrected) mag phot.color;em.opt;arith.diff double nullable si_iv_trough_rf_ew Rest Frame Equivalent Width of the SiIV Trough Angstrom spect.line.eqWidth;em.UV double nullable gal_ext_i_band Galactic Extinction in i Band mag phys.absorption;em.opt.I double nullable c_iv_troughs_2k_num Number of Distinct CIV Troughs of Width Larger Than 2000 km/s meta.number short nullable xmm_best_hb_flux_error Error in Hard (4.5-12keV) X-Ray Flux from XMM-Newton erg/s/cm^2 stat.error;phot.flux;em.X-ray.medium double nullable morphology_flag SDSS Morphology Flag (0=Point Source, 1=Extended) meta.code;src.morph short nullable wise_w2_chi2 Chi^2 in W2 Band stat.fit.chi2;phot.mag;em.IR.4-8um double nullable target_flux_z_band Target Flux in the z Band (Not Corrected for Galactic Extinction) in nanomaggies nmaggy phot.flux.density;em.opt double nullable gal_ext_g_band Galactic Extinction in g Band mag phys.absorption;em.opt.B double nullable c_iii_blue_hwhm Blue HWHM of CIII Emission Line km/s spect.line.width;em.UV double nullable al_iii_trough_rf_ew Rest Frame Equivalent Width of the AlIII Trough Angstrom spect.line.eqWidth;em.UV double nullable sdss_dr7_plate_number SDSS-DR7 Spectroscopic Plate Number If the Quasar Is Known from DR7 meta.id;instr.plate int nullable wise_w3_chi2 Chi^2 in W3 Band stat.fit.chi2;phot.mag;em.IR.8-15um double nullable ukidss_flux_h_band H-Band Flux Density from UKIDSS W/m^2/Hz phot.flux;em.IR.H double nullable xmm_mean_fb_flux Total Weighted Average Flux (0.2-12keV) from XMM-Newton erg/s/cm^2 phot.flux;em.X-ray double nullable target_flux_g_band Target Flux in the g Band (Not Corrected for Galactic Extinction) in nanomaggies nmaggy phot.flux.density;em.opt.B double nullable uniform_sample_flag Uniform Sample Flag meta.code short nullable wise_w2_mag_error Error in W2 Magnitude mag stat.error;phot.mag;em.IR.4-8um double nullable jmag_flag J-Band Photometry Flag meta.code;phot.mag;em.IR.J short nullable hmag 2MASS H Magnitude (Vega) mag phot.mag;em.IR.H double nullable first_match_flag Flag Indicates FIRST Match meta.code;src;em.radio.750-1500MHz short nullable mg_ii_amplitude Amplitude of MgII Emission Line in Units of Median RMS Pixel Noise spect.line.strength;em.UV double nullable snr_5150_angstrom Median Signal-to-Noise Ratio in the Window 5100-5250 Angstrom (Rest Frame) stat.snr;obs;spect;em.opt.V double nullable galex_fuv_flux_iv Inverse Variance of FUV Flux (in nanomaggies^-2) nmaggy^-2 stat.variance;phot.flux.density;em.UV.100-200nm double nullable c_iii_amplitude Amplitude of CIII Emission Complex in Units of Median RMS Pixel Noise spect.line.strength;em.UV double nullable var_sfpar_gamma Structure Function Parameter Gamma as Defined in Palanque-Delabrouille et al. stat.param;src.var double nullable galex_match_flag Flag Indicates GALEX Match meta.code;src;em.UV short nullable snr_3000_angstrom Median Signal-to-Noise Ratio in the Window 2950-3050 Angstrom (Rest Frame) stat.snr;obs;spect;em.UV.200-300nm double nullable gal_ext_u_band Galactic Extinction in u Band mag phys.absorption;em.opt.U double nullable imag_error Error in PSF Magnitude in i Band mag stat.error;phot.mag;em.opt.I double nullable c_iv_rf_ew_error Uncertainty on the Rest Frame Equivalent Width of CIV Emission Line Angstrom stat.error;spect.line.eqWidth;em.UV double nullable sdss_wise_offset SDSS-WISE Separation arcsec pos.angDistance;em.opt;em.IR double nullable flux_z_band_iv Inverse Variance of PSF Flux in z Band in nanomaggies (G2) nmaggy stat.variance;phot.flux.density;em.opt double nullable sdss_xmm_offset SDSS-XMM-Newton Separation arcsec pos.angDistance;em.opt;em.X-ray double nullable c_iv_trough_bi_error Error in the Balnicity Index of CIV Trough km/s stat.error;obs;spect double nullable mg_ii_rf_ew Rest Frame Equivalent Width of MgII Emission Line Angstrom spect.line.eqWidth;em.UV double nullable sf_gal_ext_u_band Recalculated Galactic Extinction in u mag phys.absorption;em.opt.U double nullable wise_w3_snr Signal-to-Noise Ratio in W3 Band stat.snr;phot.mag;em.IR.8-15um double nullable flux_u_band_iv Inverse Variance of PSF Flux in u Band in nanomaggies nmaggy stat.variance;phot.flux.density;em.opt.U double nullable camera_column_number SDSS Camera Column Number meta.id;obs short nullable jmag_error Error in J Magnitude (Vega) mag stat.error;phot.mag;em.IR.J double nullable wise_w3_mag WISE W3 Magnitude (Vega) mag phot.mag;em.IR.8-15um double nullable hmag_error Error in H Magnitude mag stat.error;phot.mag;em.IR.H double nullable log_nh_gal Logarithm of Galactic HI Column Density log(cm^-2) phys.columnDensity double nullable wise_ph_flag WISE Photometric Quality Flag char nullable wise_w4_mag_error Error in W4 Magnitude mag stat.error;phot.mag;em.IR.15-30um double nullable c_iv_troughs_2k_min_vel Minimum Velocity of the CIV Troughs km/s spect.line.broad;em.UV double nullable flux_z_band PSF Flux in z Band (Not Corrected for Galactic Extinction) in nanomaggies nmaggy phot.flux.density;em.opt double nullable sf_gal_ext_i_band Recalculated Galactic Extinction in i mag phys.absorption;em.opt.I double nullable flux_u_band PSF Flux in u Band (Not Corrected for Galactic Extinction) in nanomaggies nmaggy phot.flux.density;em.opt.U double nullable pipeline_redshift_error Error in BOSS Pipeline Redshift (Error Codes -4, -5, -6) stat.error;src.redshift double nullable wise_w1_chi2 Chi^2 in W1 Band stat.fit.chi2;phot.mag;em.IR.3-4um double nullable sdss_dr7_fiber_number SDSS-DR7 Spectroscopic Fiber Number If the Quasar Is Known from DR7 meta.id;obs.param short nullable c_iv_red_hwhm Red HWHM of CIV Emission Line km/s spect.line.width;em.UV double nullable galex_fuv_flux GALEX FUV Flux (in nanomaggies) nmaggy phot.flux.density;em.UV.100-200nm double nullable ukidss_flux_k_band_error Error in K-Band Flux Density from UKIDSS W/m^2/Hz stat.error;phot.flux;em.IR.K double nullable wise_cc_flag WISE Contamination and Confusion Flag meta.code.qual;em.IR char nullable zmag_error Error in PSF Magnitude in z Band mag stat.error;phot.mag;em.opt double nullable imag PSF Magnitude in i Band (Not Corrected for Galactic Extinction) mag phot.mag;em.opt.I double nullable sdss_dr7_spect_date SDSS-DR7 Spectroscopic Date If the Quasar Is Known from DR7 mjd time.start;obs;spect int nullable ukidss_flux_h_band_error Error in H-Band Flux Density from UKIDSS W/m^2/Hz stat.error;phot.flux;em.IR.H double nullable kmag_snr K-Band Signal-to-Noise Ratio stat.snr;phot.mag;em.IR.K double nullable c_iv_troughs_2k_max_vel Maximum Velocity of the CIV Troughs km/s spect.line.broad;em.UV double nullable pipeline_redshift_flag ZWARNING Flag (BOSS Pipeline Redshift Warning Flag) meta.code;src.redshift short nullable c_iv_trough_bi Balnicity Index of CIV Trough km/s meta.code;obs;spect double nullable lii Galactic Longitude degree pos.galactic.lon double nullable ukidss_match_flag Flag Indicates UKIDSS Match meta.code;src;em.IR short nullable c_iii_rf_ew_error Uncertainty on the Rest Frame Equivalent Width of CIII Emission Complex Angstrom stat.error;spect.line.eqWidth;em.UV double nullable wise_w4_snr Signal-to-Noise Ratio in W4 Band stat.snr;phot.mag;em.IR.15-30um double nullable snr_overall Median Signal-to-Noise Ratio over the Whole Spectrum stat.snr;obs;spect double nullable wise_w2_snr Signal-to-Noise Ratio in W2 Band stat.snr;phot.mag;em.IR.4-8um double nullable target_flux_i_band Target Flux in the i Band (Not Corrected for Galactic Extinction) in nanomaggies nmaggy phot.flux.density;em.opt.I double nullable c_iii_redshift Redshift of CIII Emission Complex src.redshift double nullable gal_ext_z_band Galactic Extinction in z Band mag phys.absorption;em.opt double nullable spectral_index Spectral Index Measurement spect.index double nullable mg_ii_redshift Redshift of MgII Emission Line src.redshift double nullable galex_nuv_flux GALEX NUV Flux (in nanomaggies) nmaggy phot.flux.density;em.UV.200-300nm double nullable imaging_run_number SDSS Imaging Run Number of Photometric Measurements meta.id;obs;phot short nullable phot_proc_rerun_number SDSS Photometric Processing Rerun Number meta.number;obs char nullable ukidss_flux_k_band K-Band Flux Density from UKIDSS W/m^2/Hz phot.flux;em.IR.K double nullable ukidss_flux_j_band J-Band Flux Density from UKIDSS W/m^2/Hz phot.flux;em.IR.J double nullable ukidss_flux_j_band_error Error in J-Band Flux Density from UKIDSS W/m^2/Hz stat.error;phot.flux;em.IR.J double nullable snr_20_cm Signal-to-Noise Ratio of the FIRST Flux Density stat.snr;phot.flux.density;em.radio.750-1500MHz double nullable xmm_best_sb_lx Soft (0.2-2keV) X-Ray Luminosity from XMM-Newton erg/s phys.luminosity;em.X-ray.soft double nullable c_iii_fwhm FWHM of CIII Emission Complex km/s spect.line.width;em.UV double nullable spect_fiber_number SDSS Spectroscopic Fiber Number meta.id;obs.param short nullable wise_w2_mag WISE W2 Magnitude (Vega) mag phot.mag;em.IR.4-8um double nullable flux_i_band PSF Flux in i Band (Not Corrected for Galactic Extinction) in nanomaggies nmaggy phot.flux.density;em.opt.I double nullable anc_ts_flag_1 BOSS Target Selection Flag for Ancillary Programs 1 meta.code;phot char nullable c_iv_blue_hwhm Blue HWHM of CIV Emission Line km/s spect.line.width;em.UV double nullable xmm_best_sb_flux_error Error in Soft (0.2-2keV) X-Ray Flux from XMM-Newton erg/s/cm^2 stat.error;phot.flux;em.X-ray.soft double nullable c_iv_trough_chi2 Chi^2 of the Trough from Eq. 3 in Paris et al. (2012, Cat. VII/269) stat.fit.chi2;obs;spect double nullable xmm_best_hb_flux Hard (4.5-12keV) X-Ray Flux from XMM-Newton erg/s/cm^2 phot.flux;em.X-ray.medium double nullable pca_redshift Refined PCA Redshift src.redshift double nullable zmag PSF Magnitude in z Band (Not Corrected for Galactic Extinction) mag phot.mag;em.opt double nullable flux_i_band_iv Inverse Variance of PSF Flux in i Band in nanomaggies nmaggy stat.variance;phot.flux.density;em.opt.I double nullable c_iii_red_hwhm Red HWHM of CIII Emission Line km/s spect.line.width;em.UV double nullable hmag_flag H-Band Photometry Flag meta.code;phot.mag;em.IR.H short nullable pca_redshift_error Error in Refined PCA Redshift stat.error;src.redshift double nullable wise_w1_mag WISE W1 Magnitude (Vega) mag phot.mag;em.IR.3-4um double nullable kmag_error Error in K Magnitude mag stat.error;phot.mag;em.IR.K double nullable rass_snr Signal-to-Noise Ratio of the RASS Count Rate stat.snr;phot.count;em.X-ray.soft double nullable xmm_best_hb_flux_flag Flag for Upper Limit of Hard X-Ray Flux meta.code;phys.luminosity;em.X-ray.medium short nullable gal_ext_r_band Galactic Extinction in r Band mag phys.absorption;em.opt.R double nullable mg_ii_rf_ew_error Uncertainty on the Rest Frame Equivalent Width of MgII Emission Angstrom stat.error;spect.line.eqWidth;em.UV double nullable boss_ts_flag BOSS Target Selection Flag for the Main Survey meta.code;phot char nullable galex_nuv_flux_iv Inverse Variance of NUV Flux (in nanomaggies^-2) nmaggy^-2 stat.variance;phot.flux.density;em.UV.200-300nm double nullable sdss_rass_offset SDSS-RASS Separation arcsec pos.angDistance;em.opt;em.X-ray double nullable xmm_best_fb_flux_error Error in Total Flux (0.2-12keV) from XMM-Newton erg/s/cm^2 stat.error;phot.flux;em.X-ray double nullable number_xmm_detections Number of Detections by XMM-Newton meta.number;em.X-ray int nullable bal_vi_flag BAL Flag from Visual Inspection meta.code;obs;spect short nullable c_iv_redshift Redshift of CIV Emission Line src.redshift double nullable flux_20_cm FIRST Peak Flux Density at 20 cm mJy phot.flux.density;em.radio.750-1500MHz double nullable object_number SDSS Object Identification Number meta.id char nullable wise_w1_mag_error Error in W1 Magnitude mag stat.error;phot.mag;em.IR.3-4um double nullable orig_name Original SDSS-DR12 Source Designation (SDSS JHHMMSS.ss+DDMMSS.s) meta.id char nullable var_sfpar_a Structure Function Parameter A as Defined in Palanque-Delabrouille et al. stat.param;src.var double nullable snr_1700_angstrom Median Signal-to-Noise Ratio in the Window 1650-1750 Angstrom (Rest Frame) stat.snr;obs;spect;em.UV.100-200nm double nullable xmm_mean_fb_lx Total X-Ray Luminosity (0.2-12keV) from XMM-Newton Using Weighted Average Flux erg/s phys.luminosity;em.X-ray double nullable sdss_dr7_quasar_flag Flag [0/1] Indicates the Quasar Is Known from DR7 (Cat. VII/260) meta.code;src short nullable anc_ts_flag_2 BOSS Target Selection Flag for Ancillary Programs 2 meta.code;phot char nullable jmag_snr J-Band Signal-to-Noise Ratio stat.snr;phot.mag;em.IR.J double nullable c_iv_trough_rf_ew Rest Frame Equivalent Width of the CIV Trough Angstrom spect.line.eqWidth;em.UV double nullable var_chi2 Reduced Chi^2 When the Light Curve Is Fit with a Constant stat.fit.chi2;src.var double nullable kmag 2MASS K Magnitude (Vega) mag phot.mag;em.IR.K double nullable