J/A+A/494/799 Large Quasar Astrometric Catalogue (LQAC) (Souchay+, 2009)
The construction of the Large Quasar Astrometric Catalogue (LQAC).
Souchay J., Andrei A.H., Barache C., Bouquillon S., Gontier A-M.,
Lambert S.B., Le Poncin-Lafitte C., Taris F., Arias E.F., Suchet D.,
Baudin M.
<Astron. Astrophys. 494, 799 (2009)>
=2009A&A...494..799S 2009A&A...494..799S
ADC_Keywords: QSOs ; Positional data ; Photometry, UVBGRI ;
Photometry, infrared ; Radio lines
Keywords: reference systems - astrometry - quasars: general - catalogs
Abstract:
The very large and increasing number of quasars reckoned from various
sky surveys leads to a large quantity of data which brings various and
inhomogeneous information in the fields of astrometry, photometry,
radioastronomy and spectroscopy.
In this paper, we describe our work that aims to make available a
general compilation of the largest number of recorded quasars obtained
from all the available catalogues, with their best position estimates,
and providing physical information at both optical and radio
wavelengths.
Description:
We construct a catalogue compilation designated Large Quasar
Astrometric Catalogue (LQAC) giving equatorial coordinates, multiband
photometry, radio fluxes, redshift, luminosity distances and absolute
magnitudes. For that construction, we gather the 12 largest quasar
catalogues (4 from radio interferometry programs, 8 from optical
surveys), and we carry out systematic cross-identifications of the
objects. Informations concerning u, b, v, g, r, i, z, J, K photometry
as well as redshift and radio fluxes at 1.4GHz, 2.3GHz, 5.0GHz, 8.4GHz
and 24GHz are given when available. A small proportion of remaining
objects, not reckoned by the 12 catalogues and included in the
Veron-Cetty & Veron quasar catalogues, are added in the compilation.
The LQAC contains 113666 quasars. We use up-to-date cosmological
parameters as well as recent models for galactic extinction and
K-correction in order to evaluate the absolute magnitudes of the
objects.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
lqac.dat 221 113666 Quasars LQAC
refs.dat 224 795 Reference of Redshift LQAC
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See also:
J/AJ/127/3587 : VLBI ICRF. II (Fey+, 2004)
J/ApJS/141/13 : First VLBA calibrator survey: VCS1 catalog (Beasley+, 2002)
J/AJ/126/2562 : Second VLBA calibrator survey: VCS2 (Fomalont+, 2003)
J/AJ/129/1163 : Third VLBA calibrator survey: VCS3 (Petrov+, 2005)
J/AJ/131/1872 : Fourth VLBA calibrator survey: VCS4 (Petrov+, 2006)
VIII/60 : Interferometer phase calibration sources (Patnaik+ 1998)
II/282 : SDSS Photometric Catalog, Release 6 (Adelman-McCarthy+, 2007)
VII/241 : The 2dF QSO Redshift Survey (Croom+ 2004)
VIII/71 : The FIRST Survey Catalog, Version 03Apr11 (Becker+ 2003)
VII/158 : Revised and Updated Catalog of QSO (Hewitt+ 1993)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
I/305 : The Guide Star Catalog, Version 2.3.2 (GSC2.3) (STScI, 2006)
I/284 : The USNO-B1.0 Catalog (Monet+ 2003)
VII/248 : Quasars and Active Galactic Nuclei (12th Ed.) (Veron+ 2006)
http://www.aoc.nrao.edu/~gtaylor/csource.html : VLA catalog
Byte-by-byte Description of file: lqac.dat
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Bytes Format Units Label Explanations
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1- 15 F15.11 deg RAdeg Right Ascension J2000 (degrees) (1)
17- 31 F15.11 deg DEdeg Declination J2000 (degrees) (1)
33- 52 A20 ---- Ref [A-M-] Flags indicating presence of the quasar
in one of the 13 catalogues from A to M (2)
54- 55 A2 ---- FS [*!x?- ] Flag characteristic of the
cross-identification ambiguity of quasars
involving HB and VV06 (3)
57- 61 F5.2 mag Umag ?=0.00 Photometric magnitude in Optical U band
between 300 and 400nm (4)
63- 67 F5.2 mag Bmag ?=0.00 Photometric magnitude in Optical B band
between 400 and 500nm
69- 73 F5.2 mag Vmag ?=0.00 Photometric magnitude in Optical V band
between 500 and 600nm
75- 79 F5.2 mag Gmag ?=0.00 Photometric magnitude in Optical G band
between 400 and 500nm
81- 85 F5.2 mag Rmag ?=0.00 Photometric magnitude in Optical R band
between 600 and 750nm
87- 91 F5.2 mag Imag ?=0.00 Photometric magnitude in Optical I band
between 750 and 1000nm
93- 97 F5.2 mag Zmag ?=0.00 Photometric magnitude in Optical I band
between 750 and 1000nm
99-103 F5.2 mag Jmag ?=0.00 Photometric magnitude in Infrared
between 1000 and 1500nm
105-109 F5.2 mag Kmag ?=0.00 Photometric magnitude in Infrared
between 2000 and 3000nm
111-121 F11.8 Jy S1.4 ?=0. Radio flux between 750 and 1500MHz (20cm)
123-133 F11.8 Jy S2.0 ?=0. Radio flux between 1500 and 3000MHz (13cm)
135-145 F11.8 Jy S5.0 ?=0. Radio flux between 3 and 6GHz (6cm)
147-157 F11.8 Jy S8.4 ?=0. Radio flux between 6 and 12GHz (3.6cm)
159-169 F11.8 Jy S23 ?=0. Radio flux between 12 and 30GHz (1.2cm)
171-175 F5.3 --- z ?=0.000 Redshift
177-179 A3 --- r_z Redshift reference (5)
181-189 F9.3 Mpc Dist ?=0. The value of the bolometric distance
191-195 F5.2 mag E(B-V) ?=99.90 E(B-V) reddening value (6)
197-201 F5.2 mag Kcor.B ?=99.90 K-correction in band B (6)
203-207 F5.2 mag Kcor.K ?=99.90 K-correction in band I (6)
209-214 F6.2 mag BMAG ?=0.00 Absolute magnitude at B band
216-221 F6.2 mag IMAG ?=0.00 Absolute magnitude at I band
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Note (1): The RA, DE coordinates of the quasar in the ICRS.
These two coordinates are given in degree, with a precision of
1x10-8 (let 36 microas). Note that no quasar, even those belonging
to the ICRF, guarantees this level of accuracy, this lack of accuracy
justifies that several final digits are zero value.
Note (2): Reference catalogues are flagged with:
A = ICRF-Ext2 (Fey et al., Cat. J/AJ/127/3587, ICRF-EXT.2)
B = VLBA (Beasley et al., Cat. J/ApJS/141/13, VCS1,
Fomalont et al., Cat. J/AJ/126/2562, VCS2)
C = VLA-015, VLA catalog minus 15 sources, (Cat. J/ApJS/141/13,
J/AJ/126/2562, J/AJ/129/1163, J/AJ/131/1872)
D = JVAS (Patnaik et al., Cat. VIII/60)
E = SDSS (Adelman-McCarthy et al., Cat. II/282)
F = 2QZ (Croom et al., Cat. VII/241)
G = FIRST (Becker et al., Cat. VIII/71)
H = VLA+015, VLA catalog (Cat. J/ApJS/141/13, J/AJ/126/2562,
J/AJ/129/1163, J/AJ/131/1872)
I = HB (Hewitt & Burbidge, Cat. VII/158)
J = 2MASS (Cutri et al., 2003, Cat. II/246)
K = GSC2.3 (Lasker et al., Cat. I/305)
L = USNO B1.0 (Monet et al., Cat. I/284)
M = VV06 (Veron et al., 2006, Cat. VII/248)
Note (3): Cross-identification ambiguity of quasars:
* For 2arcsec < cross-identification A and H<5arcsec
z1 > 0, z2 > 0, Δz < 0.1 FS = *
z1 > 0, z2 > 0, Δz > 0.1 FS = !
z1 = 0 or/and z2 = 0 FS = !
* For 5arcsec < cross-identification A and H<30arcsec
z1 > 0, z2 > 0, Δz < 0.1 FS = x
z1 > 0, z2 > 0, Δz > 0.1 FS = ?
z1 = 0 or/and z2 = 0 FS = ?
* For 2arcsec < cross-identification A-L and VV06<5arcsec
z1 > 0, z2 > 0, Δz < 0.1 FS = *
z1 > 0, z2 > 0, Δz > 0.1 FS = !
z1 = 0 or/and z2 = 0 FS = !
* For 5arcsec < cross-identification A-L and VV06<10arcsec
z1 > 0, z2 > 0, Δz < 0.1 FS = x
z1 > 0, z2 > 0, Δz > 0.1 FS = ?
z1 = 0 or/and z2 = 0 FS = ?
If no cross-identification ambiguity FS = --
Note (4): For each bandwidth the photometric system in which these
magnitudes have been measured are not homogeneous, the priority being
indicated by the flag in decreasing order of the letter corresponding
catalogue.
Note (5): The redshift reference of catalogue from which it has been taken
respectively. This reference is a letter chosen from D to I if the
value of z has been taken from one of the six basic catalogues of the
compilation where this item is present. In the opposite, when the
value of z has been taken in VV06, a number linked to the catalogue
reference in VV06 is given, from 1 to 791. These numbers are release
for the origin of each redshift value. We order our catalogue
reference numbers by decreasing number of quasars.
If redshift is not known the reference is --
Note (6): Only for these columns, zero value are real.
Unknown value are fixed to 99.90.
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 3 A3 ---- Ref Redshift reference in VLQAC
8- 11 I4 ---- V+V ?=-- Redshift reference in Veron & Veron 2006
(Cat. VII/248)
16- 20 I5 ---- Nqso Number of QSOs with this reference in VLQAC
22- 40 A19 ---- BibCode The 19-digit bibcode
42-224 A183 ---- Reference Bibliography reference
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Acknowledgements:
Christophe Barache, christophe.barache(at)obspm.fr
(End) C. Barache, J. Souchay [SYRTE], Patricia Vannier [CDS] 01-Dec-2008