VERONCAT - Veron Catalog of Quasars & AGN, 13th Edition

Overview

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 H₀ = 71 km/s/Mpc and a deceleration parameter q₀ = 0 (notice the change of cosmology from previous editions in which H₀ 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 https://cdsarc.cds.unistra.fr/ftp/cats/VII/258/reject.dat. 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 https://cdsarc.cds.unistra.fr/ftp/cats/VII/248/ files table2.dat and table3.dat (sic).

The present edition of this catalog contains quasars with measured redshift known prior to July 1st, 2009.

Catalog Bibcode

2010A&A...518A..10V

References

The current edition of this catalog is:

Quasars and Active Galactic Nuclei (13th Ed.)
     Veron-Cetty M.P., Veron P.
    <Astron. Astrophys. 518, A10 (2010)>
    =2010A&A...518A..10V

Previous editions of this catalog are listed below:

    1st Edition, Veron-Cetty M.P., Veron P., 1984, ESO Scientific Report 1.
    2nd Edition, Veron-Cetty M.P., Veron P., 1985, ESO Scientific Report 4.
    3rd Edition, Veron-Cetty M.P., Veron P., 1987, ESO Scientific Report 5.
    4th Edition, Veron-Cetty M.P., Veron P., 1989, ESO Scientific Report 7.
    5th Edition, Veron-Cetty M.P., Veron P., 1991, ESO Scientific Report 10.
    6th Edition, Veron-Cetty M.P., Veron P., 1993, ESO Scientific Report 13.
    7th Edition, Veron-Cetty M.P., Veron P., 1996, ESO Scientific Report 17.
    8th Edition, Veron-Cetty M.P., Veron P., 1998, ESO Scientific Report 18.
    9th Edition, Veron-Cetty M.P., Veron P., 2000, ESO Scientific Report 19.
   10th Edition, Veron-Cetty M.P., Veron P., 2001, Astron. Astrophys. 374, 92
   11th Edition, Veron-Cetty M.P., Veron P., 2003, Astron. Astrophys. 412, 399
   12th Edition, Veron-Cetty M.P., Veron P., 2006, Astron. Astrophys. 455, 776

A complete list of the references that are given as numerical codes in this database can be obtained via anonymous FTP or the Web at https://cdsarc.cds.unistra.fr/ftp/cats/VII/258/refs.dat.

Provenance

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.

Parameters

Name
The most common name of the object.

RA
The Right Ascension of the object (given to a precision of 0.1 seconds of time in the original table).

Dec
The Declination of the object (given to a precision of 1 arcsecond in the original table).

LII
The Galactic Longitude of the object.

BII
The Galactic Latitude of the object.

Position_Flag
This flag is related to the accuracy and source for the quoted position:

      O =  optical position with an accuracy better than 1 arcsecond
      R =  radio position with an accuracy better than 1 arcsecond
      A =  approximate position

Radio_Detect
This flag is 'Y' if the object has been detected in the radio and 'N' if it has not been detected in the radio.

Flux_6_cm
The flux density at 6 cm (5 GHz) in milliJanskies (mJy). Note that the CDS version of this table has a unit of Janskies (Jy) for this parameter.

Ref_Flux_6_cm
Numerical code of the reference for the 6-cm flux density. A complete list of the references that are given as numerical codes in this database can be obtained via anonymous FTP or the Web at https://cdsarc.cds.unistra.fr/ftp/cats/VII/258/refs.dat.

Flux_20_cm
The flux density at 20 cm (1.4 GHz) in milliJanskies (mJy). Note that the CDS version of this table has a unit of Janskies (Jy) for this parameter.

Ref_Flux_20_cm
Numerical code of the reference for the 20-cm flux density. A complete list of the references that are given as numerical codes in this database can be obtained via anonymous FTP or the Web at https://cdsarc.cds.unistra.fr/ftp/cats/VII/258/refs.dat.

Redshift_Flag
This flag is set to 'E' if the redshift was estimated by slitless spectroscopy, and is set to '>' if the quoted redshift is a lower limit.

Redshift
The redshift of the object.

Object_Type
A code created by the catalog authors describing the classification of the object:

       S1:  Seyfert 1 spectrum
       S1h: broad polarized Balmer lines detected
       S1i: broad Paschen lines observed in the infrared
       S1n: narrow-line Seyfert 1
       S1.0, S1.2, S1.5, S1.8, S1.9: intermediate Seyfert galaxies
       S2:  Seyfert 2 spectrum
       S2?: probable Seyfert 2
       S3:  Seyfert 3 or liner
       S3b: Seyfert 3 or liner with broad Balmer lines
       S3h: Seyfert 3 or liner with broad polarized Balmer lines detected
       S :  unclassified Seyfert
       S?:  possibly a Seyfert
       H2:  nuclear HII region
       HP:  high optical polarization (>3%)
       BL:  confirmed BL Lac object
       BL?: probable BL Lac object
       ?:   questionable BL Lac object
       Q2: type-2 quasar

Default object_type values are set to the following for objects in tables qso.dat, bllac.dat and agn.dat, if none were explicitly given in the original tables:

      Table qso.dat    =  Q : quasar
      Table bllac.dat  =  B?: presumed BL Lac object
      Table agn.dat    =  AG: unspecified type of active galaxy

App_Mag_Flag
This flag is 'V' for a visual magnitude; 'P' for a photographic magnitude; 'B' for a blue magnitude; 'R' for a red magnitude, 'I', 'J', or 'K' for infrared-band magnitudes; or 'O' for a magnitude from a photographic O- or J- plate.

App_Mag
The apparent magnitude of the object, where the type of magnitude is specified by the value of the app_mag_flag parameter.

BV_Color
The (B-V) color of the object, when known.

UB_Color
The (U-B) color of the object, when known.

Abs_Mag
The absolute magnitude of the object (a Hubble constant of 71 km/s/Mpc and a deceleration parameter of 0 have been assumed).

Ref_Chart
Numerical code of the reference for the finding chart. A complete list of the references that are given as numerical codes in this database can be obtained via anonymous FTP or the Web at https://cdsarc.cds.unistra.fr/ftp/cats/VII/258/refs.dat.

Ref_App_Mag
Numerical code of the reference for the photometry. A complete list of the references that are given as numerical codes in this database can be obtained via anonymous FTP or the Web at https://cdsarc.cds.unistra.fr/ftp/cats/VII/258/refs.dat.

Ref_Redshift
Numerical code of the reference for the redshift. A complete list of the references that are given as numerical codes in this database can be obtained via anonymous ftp or the Web at https://cdsarc.cds.unistra.fr/ftp/cats/VII/258/refs.dat.

Broad_Type
The broad Veron object classification, a parameter created by the HEASARC which is based on the table in which it was listed in the original reference: objects in the qso.dat table have been assigned a value of 'QSO', those in bllac.dat, 'BLLAC', and those in agn.dat, 'AGN'.

Class
The HEASARC Browse classification type. The classification value is based on the value of the object_type parameter.

Contact Person

Questions regarding the VERONCAT database table can be addressed to the HEASARC Help Desk.

Page Author: Browse Software Development Team
Last Modified: Monday, 16-Sep-2024 17:36:05 EDT