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VERON93: Help

VERON93 - Quasars and AGN

Overview

The VERON93 database is the 6th edition of the Veron-Cetty & Veron "Catalogue of Quasars and Active Galactic Nuclei (1993)." It contains data for 7383 (+54) quasars, 1855 AGNs, and 171 BL Lac objects. For more information, see VERON-CETTY M.P., VERON P.: 1993, ESO Scientific Report 13.

Parameters

Name
The name of the object if known.
Alt_Name
For sources found not to be quasars, the number of the source in the 4C Radio
Source Catalog.
Flag_RA
Right Ascension flag is an `O` or `R` meaning an optical or radio position
measured with an accuracy better than 1".
RA
Right Ascension of the object.
Dec
Right Ascension and Declination of the object.
Radio_Detect
This is Yes if the object has been detected as a radio source and No if it is
not a radio source.
APPMag
V magnitude of the object when known.  
BV_Color
B-V magnitude of the object when known.  
UB_Color
U-B magnitude of the object when known.  
Flag_APPMag
This is a flag describing the type of magnitude used in APPMAG: blank
indicates a V magnitude, PHOTOGR means that a photographic magnitude
(and colors, if given) is given, while R means that the R magnitude is
given.
Redshift
The redshift of the object.  
Flag_Redshift
This is a flag which qualifies the REDSHIFT: ~ means that the redshift
was estimated from a low-dispersion, slitless spectrum, while > means
that it is a lower limit.
Flux_6_Cm
Six centimeter flux in milli-Jy.
Ref_Flux_6Cm
Reference for six centimeter flux.
Flux_11_Cm
Eleven centimeter flux in milli-Jy.
Ref_Flux_11Cm
Reference for eleven centimeter flux.
Xray_Detect
`Xray Detect` indicates whether the object has been detected in the X-ray range.
Object_Type
The class identification, as found within the data.  The following are the
possible entries, and their explanations:
-------------------------------------------------------------------------------
	S1: Seyfert 1 spectrum
	S2: Seyfert 2 spectrum
	S3: Seyfert 3 or liner
	S?: possibly a Seyfert
	H2: nuclear HII region
	HP: high optical polarization (>3%)
	BL: confirmed BL Lac object
	G: galaxy
	*: Star
-------------------------------------------------------------------------------

Old_Object_Type
The original class identification.  Here are the possible values with
explanations:
-------------------------------------------------------------------------------
	S1: Seyfert 1 spectrum
	S2: Seyfert 2 spectrum
	S3: Seyfert 3 or liner
	S?: possibly a Seyfert
	H2: nuclear HII region
	HP: high optical polarization (>3%)
	BL: confirmed BL Lac object
-------------------------------------------------------------------------------

Class
BROWSE classification of the object.  In the case of sources found not to
be quasars, this is the value of the NEW class definition.
Ref_Chart
Reference for the finding chart.
Ref_Photometry
Reference for the photometry.
Ref_Redshift
Reference for the redshift.
Ref_Object_Type
Reference for the new class evaluation for sources found not to be quasars.

Contact Person

Questions regarding the VERON93 database table can be addressed to the HEASARC User Hotline.
If you have any problems, please consult the help page or mail ledas-help@star.le.ac.uk
 
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