VCV (G0): Quasars and Active Galactic Nuclei, 3rd ed. (19900225)
FILES:
vcv1.g6 (3543 quasars)
vcv2.g0 (887 galaxies with active nuclei)
vcv3.g0 (84 BL Lacertae objects)
CONTENTS: Quasars and Active Galactic Nuclei, 3rd edition
DATASET: These files form part of HyperSky dataset G-6 (G-6.2), version 19900225. Availability on HyperSky CD-ROM: Vol. 1 (1993)
DESCRIPTION: These datafiles are taken from the 3-part catalog "Quasars and Active Nuclei, 3rd Edition (Veron-Cetty and Veron, 1987)". The machine-readable version was obtained from the National Space Science Data Center(NSSDC), more specifically the Astronomical Data Center at the NASA Goddard Space Flight Center. The 3 catalog sections have been preserved in the 3 separate HyperSky datafiles. The catalog number is 7093 in the NSSDC list of machine readable catalogs.
Users should be aware that the catalogs represent collections of available data and not uniform surveys. Thus, for example, the large numbers of quasars in the vicinity of some galaxy clusters may more reflective of special studies rather than of an actual concentration of quasars.
DATA: The HyperSky datafiles contain the following catalog information:
MAG: V magnitude from the catalog, photoelectric (preferably) or else photographic.
IDENTIFICATION: Most common name of the object.
COMMENTS: The comment line contains the following additional information, provided if available for each galaxy or quasar:
* Designation in the 4C catalog, if available.
* Published redshift, z (A redshift of z = 1.50 would correspond to spectral lines being shifted to wavelengths 150% longer than those of a body at rest.) The redshift is followed by the character '/' if it was estimated from a low dispersion, slitless spectrum and is thus "of lesser accuracy or even plainly wrong as the emission lines may be easily misidentified." However, only values described in the original source as "probable" have been included here.
* Classification of the object, if available. Possible classes include:
S1 - Seyfert 1 spectrum showing broad (permitted) emission line of hydrogen.
S2 - Seyfert 2 spectrum defined as having a strong OIII(5007 angstrom) line as compared to hydrogen beta, as well as an NII (6584 angstrom) comparable in strength to hydrogen alpha.
S3 - Seyfert 3 or "liner" galaxy.
S? - Object is probably or possibly a Seyfert, but insufficient data available for a more detailed classification.
HII- Nucleus of a galaxy with an emission line spectrum similar to that of a stellar HII region.
BL - confirmed BL Lacertae object.
BL?- Possible BL Lacertae object.
* The keywords "Radio" or "Xray" if the object is a known source.