J/A+A/583/A75 Large Quasar Astrometric Catalogue 3 (LQAC-3) (Souchay+, 2015)
The third release of the Large Quasar Astrometric Catalog (LQAC-3) :
a compilation of 321 957 objects.
Souchay J., Andrei A.H., Barache C., Kalewicz T., Gattano C., Coelho B.,
Taris F., Bouquillon S., Becker O.
<Astron. Astrophys. 583, A75 (2015)>
=2015A&A...583A..75S 2015A&A...583A..75S (SIMBAD/NED BibCode)
ADC_Keywords: QSOs ; Positional data ; Photometry, UVBGRI ;
Photometry, infrared ; Radio lines
Keywords: catalogs - astrometry - reference systems - quasars: general -
astronomical databases: miscellaneous
Abstract:
From an astrometric point of view, quasars constitute quasi-ideal
reference objects in the celestial sphere, with an a priori absence of
proper motion. Since the second release of the Large Quasar
Astrometric Catalog (LQAC), a large number of quasars have been
discovered, in particular with the upcoming new release of the SDSS
quasars catalog.
Following the same procedure as in the two previous releases of the
LQAC, our aim was to compile all the quasars recorded until the
present date, with accurate recomputation of their equatorial
coordinates in the ICRS and with the maximum of information concerning
their physical properties, such as the redshift, the photometry, and
the absolute magnitudes.
Description:
We carried out the cross-identification between the 9 catalogs of
quasars chosen for their huge number of objects, including all the
available data related to magnitudes, radiofluxes, and redshifts.
This cross identification was particularly delicate because of a
slight change in coordinates between the objects common to two
successive releases of the SDSS and the elimination of some of them.
Equatorial coordinates were recomputed more accurately according to
the algorithms used for the elaboration of the Large Quasar Reference
Frame (LQRF).
Moreover, absolute magnitudes and morphological indexes of the new
objects were given, following the same method as in the LQAC-2.
Our final catalog, called LQAC-3, contains 321 957 objects including a
small proportion of AGNs (14 128) and BLLac (1183).
This is roughly 70% more than the number of objects recorded in the
LQAC-2.
The LQAC-3 will be useful for the astronomical community since it
gives the most complete information available about the whole set of
already recorded quasars, with emphasis on the precision and accuracy
of their coordinates with respect to the ICRF2.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
lqac3.dat 352 321957 Quasars LQAC-3
--------------------------------------------------------------------------------
See also:
I/284 : The USNO-B1.0 Catalog (Monet+ 2003)
I/305 : The Guide Star Catalog, Version 2.3.2 (GSC2.3) (STScI, 2006)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
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)
VII/258 : Quasars and Active Galactic Nuclei (13th Ed.) (Veron+ 2010)
VIII/60 : Interferometer phase calibration sources (Patnaik+ 1998)
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)
J/AJ/136/580 : Sixth VLBA calibrator survey: VCS6 (Petrov+, 2008)
J/MNRAS/372/425 : 2dF-SDSS Luminous Red Galaxy Survey, 2SLAQ (Cannon+, 2006)
J/MNRAS/392/19 : The 2dF-SDSS QSO survey (Croom+, 2009)
http://www.aoc.nrao.edu/~gtaylor/csource.html : VLA catalog
J/A+A/494/799 : Large Quasar Astrometric Catalogue (LQAC) (Souchay+, 2009)
J/A+A/537/A99 : Large Quasar Astrometric Catalogue 2 (LQAC-2) (Souchay+, 2012)
Byte-by-byte Description of file: lqac3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 16 A16 --- LQAC LQAC name given for each object based on
equatorial coordinates
19- 42 A24 --- OName Name of the quasar in the original catalog
44- 49 A6 --- Nature Nature of the object (1)
53- 66 F14.10 deg RAdeg Right ascension (J2000) in original catalog (2)
69- 82 F14.10 deg DEdeg Declination (J2000) in original catalog (2)
85- 98 F14.10 deg RALdeg Right ascension (J2000) given by LQRF (3)
101-114 F14.10 deg DELdeg Declination (J2000) given by LQRF (3)
117-129 A13 --- Ref Flags indicating the presence of the quasar
in the 13 catalogs belonging to the
compilation (4)
132 A1 --- FS [!*-?x] Flag characteristic of an ambiguity in
the cross-identification of two catalogs (5)
135-141 F7.5 --- z Redshift
145-152 F8.5 mag Umag ?=0 Photometric magnitude in Optical U band
between 300 and 400 nm (6)
155-162 F8.5 mag Bmag ?=0 Photometric magnitude in Optical B band
between 400 and 500 nm (6)
165-172 F8.5 mag Vmag ?=0 Photometric magnitude in Optical V band
between 500 and 600 nm (6)
175-182 F8.5 mag Gmag ?=0 Photometric magnitude in Optical G band
between 400 and 500 nm (6)
185-192 F8.5 mag Rmag ?=0 Photometric magnitude in Optical R band
between 600 and 750 nm (6)
195-202 F8.5 mag Imag ?=0 Photometric magnitude in Optical I band
between 750 and 1000 nm (6)
205-212 F8.5 mag Zmag ?=0 Photometric magnitude in Optical Z band (6)
215-222 F8.5 mag Jmag ?=0 Photometric magnitude in Infrared band
between 1000 and 1500 nm (7)
225-232 F8.5 mag Kmag ?=0 Photometric magnitude in Infrared K band
between 2000 and 3000 nm (7)
235-242 F8.5 Jy S1.4 ?=0 Radio flux between 750 and 1500 MHz (20cm)
245-252 F8.5 Jy S2.0 ?=0 Radio flux between 1500 and 3000 MHz (13cm)
255-262 F8.5 Jy S5.0 ?=0 Radio flux between 3 and 6 GHz (6cm)
265-272 F8.5 Jy S8.4 ?=0 Radio flux between 6 and 12 GHz (3.6cm)
275-282 F8.5 Jy S23 ?=0 Radio flux between 12 and 30 GHz (1.2cm)
289-292 F4.1 --- I1B ?=-9.9 Sharp morphology index in band B
294-297 F4.1 --- I2B ?=-9.9 Sround morphology index in band B
299-302 F4.1 --- I3B ?=-9.9 Ground morphology index in band B
304-307 F4.1 --- I1R ?=-9.9 Sharp morphology index in band R
309-312 F4.1 --- I2R ?=-9.9 Sround morphology index in band R
314-317 F4.1 --- I3R ?=-9.9 Ground morphology index in band R
319-322 F4.1 --- I1I ?=-9.9 Sharp morphology index in band I
324-327 F4.1 --- I2I ?=-9.9 Sround morphology index in band I
329-332 F4.1 --- I3I ?=-9.9 Ground morphology index in band I
334-342 F9.5 mag BMAG ?=-9.9 Absolute magnitude in band B
344-352 F9.5 mag IMAG ?=-9.9 Absolute magnitude in band I
--------------------------------------------------------------------------------
Note (1): The nature of the object is generally a QSO, noted "QUASAR".
It is "RADIO" when observed in VLBI.
It is BLAC or AGN when this terminology is found
in Veron-Cetty and Veron (2010, Cat. VII/258)
Note (2): The RA, DE coordinates of the quasar according to the original
catalog it has been found.
These two coordinates are given in degree, with a precision of 1x10-10
(i.e. 36 microarcseconds).
Note that no quasar, even belonging to the ICRF2, guarantees this level of
accuracy.
This justifies that in many cases Final digits have a zero value
Note (3): The RA, DE coordinates of the quasar given by their recalculation in
the LQRF (Andrei et al., 2009A&A...505..385A 2009A&A...505..385A, Cat. I/313)
Note (4): The catalogs flags are the following ones :
A = ICRF2 (Ma et al., 2009, IERS, Technical Note No. 35;
Boboltz et al., 2010, Bull. of the Am. Astron. Soc. 42,512)
B = VLBA (VCS Petrov et al., Cat. J/AJ/136/580, version 2013)
C = VLA (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 (combination DR7-DR10, https://www.sdss.org/dr7/ -
https://www.sdss3.org/dr8/ - https://www.sdss3.org/dr10/)
F = 2QZ (Croom et al., Cat. VII/241)
G = 2df-SDSS (2df-SDSS LRG and QSO survey (2009));
da Angela et al., 2008MNRAS.383..565D 2008MNRAS.383..565D;
LRG: Cannon et al., Cat. J/MNRAS/372/425;
QOS: Croom et al., Cat. J/MNRAS/392/19
H = FIRST (Becker et al., Cat. VIII/71)
I = Hewitt and Burbridge, Cat. VII/158
J = 2MASS (only for magnitude information) (Cutri et al., Cat. II/246)
K = GSC2.3 (only for magnitude information) (Lasker et al., Cat. I/305)
L = B1.0 (only for magnitude information) (Monet et al., Cat. I/284)
M = Veron-Cetty and Veron (2010, Cat. VII/258)
m = object is a SDSS quasar found only in Veron-Cetty and Veron (2010,
Cat. VII/258) catalog, but no more in the new SDSS releases
Note (5): Cross-identification ambiguity of quasars:
* For 2 arcsec < cross-identification A-L and VV10 < 5 arcsec
z_1 > 0, z_2 > 0, Delta z < 0.1 FS = *
z_1 > 0, z_2 > 0, Delta z > 0.1 FS = !
z_1 = 0 or/and z_2 =0, Delta z < 0.1 FS = !
* For 5 arcsec < cross-identification A-L and VV10 < 10 arcsec
z_1 > 0, z_2 > 0, Delta z < 0.1 FS = x
z_1 > 0, z_2 > 0, Delta z > 0.1 FS = ?
z_1 = 0 or/and z_2 =0, Delta z < 0.1 FS = ?
* if no cross-identification ambiguity FS = -
Note (6): For each bandwidth the photometric systems in which the magnitudes
have been measured are not homogeneous, the priority being indicated
by the catalog flag letter in decreasing alphabetic order.
Note (7): Comming from 2MASS (Cutri et al., Cat. II/246)
--------------------------------------------------------------------------------
Acknowledgements:
Jean Sourchay, jean.souchay(at)obspm.fr
Christophe Barache, christophe.barache(at)obspm.fr
Observatoire Paris/SYRTE/PSL/CNRS/Sorbonne Universites/UPMC
(End) J. Souchay, C. Barache [Observatoire Paris], P. Vannier [CDS] 13-Nov-2015