Veron ivo://nasa.heasarc/veroncat NASA/GSFC HEASARC Veron-Cetty, Veron 2026-04-24 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov AGN This database table contains the 13th edition of the Catalog of Quasars and Active Galactic Nuclei by Veron-Cetty and Veron, and is an update of the previous versions. As in the previous editions, no information about absorption lines or X-ray properties is given, but absolute magnitides are provided, assuming a Hubble constant H<sub>0</sub> = 71 km/s/Mpc and a deceleration parameter q<sub>0</sub> = 0 (notice the change of cosmology from previous editions in which H<sub>0</sub> was assumed to be 50 km/s/Mpc). The present edition of this catalog contains 133336 quasars, 1374 BL Lac objects and 34231 active galaxies (including 15627 Seyfert 1 galaxies), for a grand total of 168941 objects, significantly more than the number of objects listed in the 12th edition (108080). The 13th edition includes positions and redshifts, as well as photometry (U, B, and V) and 6-cm and 20-cm flux densities, when available. 178 objects once proposed but now rejected as quasars are NOT included in the online version of this catalog: their names and positions are listed in the file <a href="https://cdsarc.cds.unistra.fr/ftp/cats/VII/258/reject.dat">https://cdsarc.cds.unistra.fr/ftp/cats/VII/258/reject.dat</a>. This HEASARC table also does NOT contain the additional information on gravitationally lensed quasars and quasar pairs listed in Tables 3 and 4 of the published paper: these tables are available in electronic form at the CDS <a href="https://cdsarc.cds.unistra.fr/ftp/cats/VII/248/">https://cdsarc.cds.unistra.fr/ftp/cats/VII/248/</a> files table2.dat and table3.dat (sic). The present edition of this catalog contains quasars with measured redshift known prior to July 1st, 2009. This online catalog was created by the HEASARC in April 2010 based on machine-readable tables obtained from the CDS (their catalog VII/258, files qso.dat, bllac.dat, and agn.dat). It was last updated in June 2012 to tweak some class values. This is a service provided by NASA HEASARC . 2010A&A...518A..10V https://heasarc.gsfc.nasa.gov/W3Browse/all/veroncat.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=veroncat& GET text/xml 180 99999 true 91.425 -86.63166667 0.0333333333333333 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=veroncat GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_veroncat&Action=More+Options&Action=Parameter+Search&ConeAdd=1 GALAXY CATALOG 0.0333333333333333 Optical Radio public veroncat Veron Catalog of Quasars & AGN, 13th Edition name Most Common Designation of the Object 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 app_mag Magnitude (Type Specified by app_mag_flag) mag phot.mag;em.opt double nullable app_mag_flag Magnitude Type: V=visual,P=photographic,B=blue,R=red,I/J/K=infrared,O=O/J-plate meta.code;phot.mag;em.opt char nullable redshift_flag Flag for Redshift: E=estimate, >=lower limit meta.code;src.redshift char nullable redshift Redshift src.redshift double nullable object_type Veron Object Classification src.class char 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 ref_app_mag Reference Code for the Photometry meta.ref;phot.mag;em.opt short nullable bii Galactic Latitude degree pos.galactic.lat double nullable radio_detect Radio Detection Flag [YN] meta.code;obs;em.radio char nullable ref_flux_20_cm Reference Code for 20-cm Flux Density meta.ref;phot.flux.density;em.radio.750-1500MHz short nullable broad_type Broad Veron Object Classification: QSO, BLLAC, or AGN src.class char nullable flux_6_cm 6-cm (5-GHz) Flux Density (mJy) mJy phot.flux.density;em.radio.3-6GHz double nullable lii Galactic Longitude degree pos.galactic.lon double nullable ub_color U-B Color Index mag phot.color;em.opt.U;em.opt.B double nullable flux_20_cm 20-cm (1.4-GHz) Flux Density (mJy) mJy phot.flux.density;em.radio.750-1500MHz double nullable ref_flux_6_cm Reference Code for 6-cm Flux Density meta.ref;phot.flux.density;em.radio.3-6GHz short nullable position_flag Position Derivation Flag: O=optical,R=radio,A=approximate meta.code.qual;pos char nullable ref_chart Reference Code for the Finding Chart meta.ref;pos short nullable ref_redshift Reference Code for the Redshift meta.ref;src.redshift short nullable abs_mag Absolute Magnitude mag phys.magAbs;em.opt double nullable bv_color B-V Color Index mag phot.color;em.opt.B;em.opt.V double nullable class Browse Object Classification src.class short nullable