TABLE DR3QuasarCatalog

The catalog of all confirmed quasars in SDSS Data Release 3.
NOTE: The DRxQuasarCatalog a derived science table that may not be loaded for every release or available at the time the release is published.

This is a table containing all the quasars identified in the SDSS DR3 data. The paper describing the contents of this table is usually found in the Expert Background page of the SkyServer SDSS section (Schneider et al. 2005).

name type length unit ucd description

SDSSName varchar 64 SDSS Object Name, hhmmss.ss+ddmmss.s (J2000; truncated coordinates), see http://www.sdss.org/DR3/coverage/IAU.html

RA float 8 deg J2000 R.A.

dec float 8 deg J2000 declination

z real 4 Redshift

psfmag_u real 4 mag PSF-fitting magnitude in each band from

psfmagerr_u real 4 mag "BEST" version of data (latest photometry

psfmag_g real 4 mag and final target selection version).

psfmagerr_g real 4 mag asinhmag: Lupton,Gunn & Szalay 1999, AJ, 118, 1406

psfmag_r real 4 mag SDSS photometry is close to AB in g,r,i (to 0.01 mag)

psfmagerr_r real 4 mag u_AB = u_SDSS - 0.04; z_AB = z_SDSS + 0.02

psfmag_i real 4 mag (with some uncertainty about the true z shift)

psfmagerr_i real 4 mag AB: Oke and Gunn 1983, ApJ, 266, 713,

psfmag_z real 4 mag see Flux Calibration in Algorithms Help page.

psfmagerr_z real 4 mag

A_u real 4 mag Galactic absorption in u band, A_g/A_r/A_i/A_z = 0.736/0.534/0.405/0.287 * A_u

lgNH real 4

FIRSTmag real 4 FIRST Peak flux density (AB mag) at 20 cm of FIRST catalog match within 2 arcsec, AB mag = -2.5 log_10(f_nu / 3631 Jy); 0 ==> no detection, -1 ==> not in FIRST survey area

FIRST_sn real 4

FIRST_sep real 4

FIRST_flux_at_opt smallint 2 1 ==> no FIRST source within 2 arcsec, but > 3 sigma FIRST flux detection at optical position

FIRST_extmatch smallint 2 For source with either FIRSTMAG > 0 or FIRST_flux_at_opt 1 ==> FIRST catalog source within 2 arcsec - 30 arcsec

lg_RASS_rate real 4 log_10 BSC/FSC full band count rate; 0 ==> no detection ROSAT All Sky Survey Bright and Faint source catalogs

RASS_sn real 4

RASS_sep real 4

TWOMASSmag_J real 4 2MASS All-Sky Point Source Catalog 2003 March 25; Note that 2MASS magnitues are Vega-based, not AB

TWOMASSmagerr_J real 4

TWOMASSmag_H real 4

TWOMASSmagerr_H real 4

TWOMASSmag_K real 4

TWOMASSmagerr_K real 4

TWOMASS_sep real 4

M_i real 4 Uses Ho=70 Omega_M=0.300 Omega_L= 0.700 alpha_Q=-0.50

morphology smallint 2 0 = point source 1 = extended

scienceprimary smallint 2 Used by CAS to resolve repeat spectra (if available) of a given object. 0 only in special cases.

mode smallint 2 1 for primary object, 2 for secondary, 3 for family

bestprimtarget int 4 Target selection flags in "BEST" version of data

ts_b_qso smallint 2 Individual flags expanded from bestprimtarget

ts_b_hiz smallint 2

ts_b_FIRST smallint 2

ts_b_ROSAT smallint 2

ts_b_serendip smallint 2

ts_b_star smallint 2

ts_b_gal smallint 2

run_best smallint 2 SDSS Imaging run number for "BEST" data

mjd_best int 4 Modified Julian Date of BEST imaging observation

mjd_spec int 4 Modified Julian Date of spectroscopic observation

plate smallint 2

fiberid smallint 2

rerun_best smallint 2 SDSS Imaging rerun, camcol, field, object number

camcol_best smallint 2

field_best smallint 2

obj_best smallint 2

tilingchunk smallint 2 Tiling chunk number

targprimtarget int 4 Target selection flags in "TARGET" version of data

t_psfmag_u real 4 PSF magnitudes and errors in "TARGET" version of data

t_psfmagerr_u real 4

t_psfmag_g real 4

t_psfmagerr_g real 4

t_psfmag_r real 4

t_psfmagerr_r real 4

t_psfmag_i real 4

t_psfmagerr_i real 4

t_psfmag_z real 4

t_psfmagerr_z real 4

object_name varchar 64 Object Name if previously published; "SDSS" if previously published SDSS discovery

specObjId bigint 8 Unique SDSS ID of corresponding object in SpecObjAll table

name	type	length	unit	ucd	description
SDSSName	varchar	64			SDSS Object Name, hhmmss.ss+ddmmss.s (J2000; truncated coordinates), see http://www.sdss.org/DR3/coverage/IAU.html
RA	float	8	deg		J2000 R.A.
dec	float	8	deg		J2000 declination
z	real	4			Redshift
psfmag_u	real	4	mag		PSF-fitting magnitude in each band from
psfmagerr_u	real	4	mag		"BEST" version of data (latest photometry
psfmag_g	real	4	mag		and final target selection version).
psfmagerr_g	real	4	mag		asinhmag: Lupton,Gunn & Szalay 1999, AJ, 118, 1406
psfmag_r	real	4	mag		SDSS photometry is close to AB in g,r,i (to 0.01 mag)
psfmagerr_r	real	4	mag		u_AB = u_SDSS - 0.04; z_AB = z_SDSS + 0.02
psfmag_i	real	4	mag		(with some uncertainty about the true z shift)
psfmagerr_i	real	4	mag		AB: Oke and Gunn 1983, ApJ, 266, 713,
psfmag_z	real	4	mag		see Flux Calibration in Algorithms Help page.
psfmagerr_z	real	4	mag
A_u	real	4	mag		Galactic absorption in u band, A_g/A_r/A_i/A_z = 0.736/0.534/0.405/0.287 * A_u
lgNH	real	4
FIRSTmag	real	4			FIRST Peak flux density (AB mag) at 20 cm of FIRST catalog match within 2 arcsec, AB mag = -2.5 log_10(f_nu / 3631 Jy); 0 ==> no detection, -1 ==> not in FIRST survey area
FIRST_sn	real	4
FIRST_sep	real	4
FIRST_flux_at_opt	smallint	2			1 ==> no FIRST source within 2 arcsec, but > 3 sigma FIRST flux detection at optical position
FIRST_extmatch	smallint	2			For source with either FIRSTMAG > 0 or FIRST_flux_at_opt 1 ==> FIRST catalog source within 2 arcsec - 30 arcsec
lg_RASS_rate	real	4			log_10 BSC/FSC full band count rate; 0 ==> no detection ROSAT All Sky Survey Bright and Faint source catalogs
RASS_sn	real	4
RASS_sep	real	4
TWOMASSmag_J	real	4			2MASS All-Sky Point Source Catalog 2003 March 25; Note that 2MASS magnitues are Vega-based, not AB
TWOMASSmagerr_J	real	4
TWOMASSmag_H	real	4
TWOMASSmagerr_H	real	4
TWOMASSmag_K	real	4
TWOMASSmagerr_K	real	4
TWOMASS_sep	real	4
M_i	real	4			Uses Ho=70 Omega_M=0.300 Omega_L= 0.700 alpha_Q=-0.50
morphology	smallint	2			0 = point source 1 = extended
scienceprimary	smallint	2			Used by CAS to resolve repeat spectra (if available) of a given object. 0 only in special cases.
mode	smallint	2			1 for primary object, 2 for secondary, 3 for family
bestprimtarget	int	4			Target selection flags in "BEST" version of data
ts_b_qso	smallint	2			Individual flags expanded from bestprimtarget
ts_b_hiz	smallint	2
ts_b_FIRST	smallint	2
ts_b_ROSAT	smallint	2
ts_b_serendip	smallint	2
ts_b_star	smallint	2
ts_b_gal	smallint	2
run_best	smallint	2			SDSS Imaging run number for "BEST" data
mjd_best	int	4			Modified Julian Date of BEST imaging observation
mjd_spec	int	4			Modified Julian Date of spectroscopic observation
plate	smallint	2
fiberid	smallint	2
rerun_best	smallint	2			SDSS Imaging rerun, camcol, field, object number
camcol_best	smallint	2
field_best	smallint	2
obj_best	smallint	2
tilingchunk	smallint	2			Tiling chunk number
targprimtarget	int	4			Target selection flags in "TARGET" version of data
t_psfmag_u	real	4			PSF magnitudes and errors in "TARGET" version of data
t_psfmagerr_u	real	4
t_psfmag_g	real	4
t_psfmagerr_g	real	4
t_psfmag_r	real	4
t_psfmagerr_r	real	4
t_psfmag_i	real	4
t_psfmagerr_i	real	4
t_psfmag_z	real	4
t_psfmagerr_z	real	4
object_name	varchar	64			Object Name if previously published; "SDSS" if previously published SDSS discovery
specObjId	bigint	8			Unique SDSS ID of corresponding object in SpecObjAll table