J/A+A/624/A145 Astrometric Catalogue 5, LQAC-5 (Souchay+, 2019)
LQAC-5: The fifth release of the Large Quasar Astrometric Catalogue.
A compilation of 592809 objects with 398697 Gaia counterparts.
Souchay J., Gattano C., Andrei A.H., Souami D., Coelho B., Barache C.,
Taris F., Secrest N., Berthereau A.
<Astron. Astrophys. 624, A145 (2019)>
=2019A&A...624A.145S 2019A&A...624A.145S (SIMBAD/NED BibCode)
ADC_Keywords: Combined data ; Cross identifications ; Active gal. nuclei ;
Photometry ; Positional data ; Redshifts ; Magnitudes, absolute ;
Morphology
Keywords: catalogs - reference systems - astrometry - quasars: general
Abstract:
In addition to their great astrophysical interest, quasars represent
quasi-ideal reference objects in the celestial sphere with, a priori,
a lack of significant proper motion. Since the fourth release of the
Large Quasar Astrometric Catalogue (LQAC-4), a large number of quasars
have been discovered, in particular those coming from the DR14Q
release of the SDSS. With the advent of the Gaia Data Release 2 (DR2),
it is now also possible to fold in extremely accurate quasar
positions.
Following the same procedure as in the previous releases of the LQAC,
our aim is to compile the large majority of the recorded quasars, with
their best estimated coordinates and substantial information about
their physical properties such as the redshift, multi-bands apparent,
and absolute magnitudes. Emphasis is given to the results of the
cross-matches with the Gaia DR2 catalogue, which considerably
increases the positional accuracy.
New quasars from the SDSS DR14Q release were cross-matched with the
precedent LQAC-4 compilation with a 1" search radius, which leads to
149084 objects not present in the previous LQAC-4 release. Another
cross-match was done with the Gaia DR2 catalogue, which enables us to
considerably improve the positioning of these objects. For the first
time, parallaxes and proper motions from the DR2, when available, are
added to our compilation. Furthermore, a cross-identification of the
LQAC-5 with the AllWISE survey gives additional mid-infrared
information for an important percentage of objects.
Our final catalogue, namely the LQAC-5, contains 592 809 quasars. This
represents roughly a 34% increase with respect to the number of
objects recorded in the LQAC-4. Among them, 398 697 objects were found
in common with the Gaia DR2, within a 1" search radius. That
corresponds to 67.26% of the whole population of the compilation.
The LQAC-5 delivers a nearly complete catalogue of spectroscopically
confirmed quasars (including a small proportion of 14126 compact
AGN's) to the astronomical community, with the aim of giving their
best equatorial coordinates with respect to the ICRF2 and with
exhaustive additional information. For more than 50% of the sample,
these coordinates are extracted from the very recent Gaia DR2.
Description:
Following the same procedure as in the previous releases of the LQAC,
our aim is to compile the large majority of the recorded quasars, with
their best estimated coordinates and substantial information about
their physical properties such as the redshift, multi-bands apparent,
and absolute magnitudes. Emphasis is given to the results of the
cross-matches with the Gaia DR2 catalogue, which considerably
increases the positional accuracy.
Our final catalogue, namely the LQAC-5, contains 592809 quasars. This
represents roughly a 34% increase with respect to the number of
objects recorded in the LQAC-4. Among them, 398 697 objects were found
in common with the Gaia DR2, within a 1" search radius. That
corresponds to 67.26% of the whole population of the compilation.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
lqac5.dat 544 592809 5th release of LQAC5
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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 7 (Adelman-McCarthy+, 2007)
II/294 : The SDSS Photometric Catalog, Release 7
(Adelman-McCarthy+, 2009)
VII/279 : SDSS quasar catalog: twelfth data release (Paris+, 2017)
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)
I/323 : International Celestial Reference Frame 2, ICRF2 (Ma+, 2009)
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)
J/AJ/151/154 : Second epoch VLBA Calibrator Survey (VCS-II) (Gordon+, 2016)
J/MNRAS/414/2528 : LBA Calibrator Survey (LCS1) (Petrov+, 2011)
J/AJ/142/35 : The VLBA Galactic Plane Survey (VGaPS) (Petrov+, 2011)
J/AJ/142/89 : Precise astrometry with VLBA (VIPS) (Petrov+, 2011)
J/ApJS/188/405 : Fermi-LAT first source catalog (1FGL) (Abdo+, 2010)
J/ApJS/194/25 : The VLBA calibrator search for the BeSSeL survey
(Immer+, 2011)
J/MNRAS/419/1097 : The EVN Galactic Plane Survey - EGaPS (Petrov, 2012)
http://www.aoc.nrao.edu/~gtaylor/csource.html : VLA catalog
J/ApJS/221/12 : AGNs in the MIR using ALLWISE data (Secrest+, 2015)
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)
J/A+A/583/A75 : Large Quasar Astrometric Catalogue 3 (LQAC-3) (Souchay+, 2015)
J/A+A/614/A140 : Large Quasar Astrometric Catalogue 4, LQAC-4 (Gattano+, 2018)
Byte-by-byte Description of file: lqac5.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- LQAC LQAC name given for each object based on
equatorial coordinates
20 I1 --- Flag [3/5] Flag to recognize already recorded or new
sources (1)
23- 46 A24 --- OName Name of the quasar in the original catalog (2)
48- 53 A6 --- Nature Nature of the object (3)
56- 69 F14.10 deg RAOdeg Right ascension (J2000) in original catalog (4)
72- 85 F14.10 deg DEOdeg Declination (J2000) in original catalog (4)
88- 91 A4 --- Source Source of the following optimized equatorial
coordinates (5)
94-107 F14.10 deg RAdeg Optimized Right ascension (J2000) (6)
110-123 F14.10 deg DEdeg Optimized Declination (J2000) (6)
126-132 F7.3 mas e_RAdeg ?=-9.9 Uncertainity in d(alpha)xcos(delta) in
Gaia DR1 or Gaia DR2 (7)
135-141 F7.3 mas e_DEdeg ?=-9.9 Uncertainty in d(delta) in Gaia DR1
or Gaia DR2 (7)
145-151 F7.3 mas Plx ?=100.000 Parallax in Gaia DR2
155-161 F7.3 mas e_Plx ?=100.000 Uncertainty Parallax in Gaia DR2
165-171 F7.3 mas/yr pmRA* ?=100.000 Proper Motion in Right ascension
in Gaia DR2 (mualphax cos delta)
175-181 F7.3 mas/yr e_pmRA* ?=100.000 Uncertainty in Proper Motion
in Right ascension in Gaia DR2
185-191 F7.3 mas/yr pmDE ?=100.000 Proper Motion in Declination
in Gaia DR2
195-201 F7.3 mas/yr e_pmDE ?=100.000 Uncertainty in Proper Motion
in Declination in Gaia DR2
204-216 A13 --- Ref Flags indicating the presence of the quasar
in the 13 catalogs belonging to the
compilation (8)
219-222 A4 --- GAIA Flag to recognize recorded sources in
GAIA-DR1 or/and Gaia-DR2 (9)
229-235 F7.5 --- z ?=0.00000 Redshift
242-248 F7.3 mag Gmag2 ?=100.000 Photometric magnitude in Optical G
Gaia band from the DR2
252-258 F7.3 mag BPmag ?=100.000 Photometric magnitude in Optical BP
Gaia DR2 band
262-268 F7.3 mag RPmag ?=100.000 Photometric magnitude in Optical RP
Gaia DR2 band
275-280 F6.3 mag umag ?=0 Photometric magnitude in Optical u band
between 300 and 400 nm (10)
283-288 F6.3 mag Bmag ?=0 Photometric magnitude in Optical B band
between 400 and 500nm (10)
291-296 F6.3 mag Gmag1 ?=0 Photometric magnitude in Optical G Gaia
band from the DR1
299-304 F6.3 mag Vmag ?=0 Photometric magnitude in Optical V band
between 500 and 600 nm (10)
307-312 F6.3 mag gmag ?=0 Photometric magnitude in Optical g band
between 400 and 500nm (10)
315-320 F6.3 mag rmag ?=0 Photometric magnitude in Optical r band
between 600 and 750nm (10)
323-328 F6.3 mag imag ?=0 Photometric magnitude in Optical i band
between 750 and 1000nm (10)
331-336 F6.3 mag zmag ?=0 Photometric magnitude in Optical z band
(10)
339-344 F6.3 mag Jmag ?=0 Photometric magnitude in Infrared J band
between 1000 and 1500 nm (11)
347-352 F6.3 mag Kmag ?=0 Photometric magnitude in Infrared K band
between 2000 and 3000 nm (11)
355-360 F6.3 mag W1mag ?=0 Photometric magnitude in Infrared W1 band
3.4um (12)
363-368 F6.3 mag W2mag ?=0 Photometric magnitude in Infrared W2 band
4.6um (12)
371-376 F6.3 mag W3mag ?=0 Photometric magnitude in Infrared W3 band
12um (12)
379-384 F6.3 mag W4mag ?=0 Photometric magnitude in Infrared W4 band
22um (12)
387-392 F6.3 Jy S1.4 ?=0 Radio flux between 750 and 1500MHz (20cm)
395-400 F6.3 Jy S2.3 ?=0 Radio flux between 1500 and 3000MHz (13cm)
403-408 F6.3 Jy S5.0 ?=0 Radio flux between 3 and 6GHz (6cm)
411-416 F6.3 Jy S8.4 ?=0 Radio flux between 6 and 12GHz (3.6cm)
419-424 F6.3 Jy S23 ?=0 Radio flux between 12 and 30GHz (1.2cm)
431-434 F4.1 --- I1B ?=-9.9 Sharp morphology index in band B
436-439 F4.1 --- I2B ?=-9.9 Sround morphology index in band B
441-444 F4.1 --- I3B ?=-9.9 Ground morphology index in band B
446-449 F4.1 --- I1R ?=-9.9 Sharp morphology index in band R
451-454 F4.1 --- I2R ?=-9.9 Sround morphology index in band R
456-459 F4.1 --- I3R ?=-9.9 Ground morphology index in band R
461-464 F4.1 --- I1I ?=-9.9 Sharp morphology index in band I
466-469 F4.1 --- I2I ?=-9.9 Sround morphology index in band I
471-474 F4.1 --- I3I ?=-9.9 Ground morphology index in band I
478-484 F7.3 mag BMAG ?=-9.9 Absolute magnitude in band B
488-494 F7.3 mag IMAG ?=-9.9 Absolute magnitude in band I
498-504 F7.3 mag uMAG ?=-9.9 Absolute magnitude in band u
508-514 F7.3 mag gMAG ?=-9.9 Absolute magnitude in band g
518-524 F7.3 mag rMAG ?=-9.9 Absolute magnitude in band r
528-534 F7.3 mag iMAG ?=-9.9 Absolute magnitude in band i
538-544 F7.3 mag zMAG ?=-9.9 Absolute magnitude in band z
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Note (1): Flag to recognize already recorded or new source as follows:
3 = indicates that the sources have been already recorded in LQAC-3
4 = indicates that the sources have been already recorded in LQAC-4
5 = indicates that the sources is a new entry within the LQAC-5
Note (2): This field may contain white spaces.
Note (3): The nature of the object is generally a QSO, noted "QUASAR".
It is "RADIO" when observed in VLBI and not belonging to the ICRF2.
It is "ICRF2" when included in ICRF2.
It is "BL LAC" or "AGN" when this terminology is found
in Veron-Cetty and Veron (2010, Cat. VII/258)
This field may contain white spaces.
Note (4): The RA, DE are the coordinates of the quasar according to the original
catalog where 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, GAIA-DR1
or GAIA-DR2 guarantees this level of accuracy.
This justifies that in many cases, final digits have a zero value.
Note (5): "ORIG" means the optimized coordinates are taken from the original
catalogue with the best astrometric precision ;
"DR1" means they are taken from Gaia-DR1
(Gaia Collaboration, 2016A&A...595A...1G 2016A&A...595A...1G, Cat. I/337) ;
"DR2" means they are taken from Gaia-DR2
(Gaia Collaboration, 2018A&A...616...1G, Cat. I/345) ;
"ICRF" means they are taken from the ICRF2 catalogue
(Ma+, 2009ITN....35....1M 2009ITN....35....1M, Cat. I/323) ;
"LQRF" means they are recalculated in the LQRF
(Andrei et al., 2009A&A...505..385A 2009A&A...505..385A, Cat. I/313)
Note (6): 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 or GAIA-DR1,
guarantees this level of accuracy.
This justifies that in many cases, final digits have a zero value.
Note (7): Numerous original catalogues do not provide uncertainties on the
quasar equatorial coordinates. The uncertainties taken
from the Gaia-DR1 or Gaia-DR2 catalogues are then a precious
information about the position accuracy, when available.
Note (8): The catalogs flags are the following ones :
A = ICRF2 (Ma et al., 2009, IERS, Technical Note No. 35)
B = RFC (Petrov http://astrogeo.org/rfc/ version 2016)
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 DR7Q-DR12Q, https://www.sdss.org/dr7/ -
https://www.sdss3.org/dr12/, Paris+, 2017A&A...597A..79P 2017A&A...597A..79P,
Cat. VII/279, 2017yCat.7278....0P 2017yCat.7278....0P)
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 (9): "DR1" indicates a cross-match with GAIA-DR1;
"DR2" indicates a cross-match with GAIA-DR2;
"DR12" indicates a cross-match with GAIA-DR1 and GAIA-DR2;
the blank field indicates the opposite.
Note (10): 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 (11): Coming from 2MASS (Cutri et al., Cat. II/246)
Note (12): Coming from AGNs in the MIR (mid infra-red)
using ALLWISE data (Secrest et al., 2015, Cat. J/ApJS/221/12)
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Acknowledgements:
Jean Sourchay, jean.souchay(at)obspm.fr
Christophe Barache, christophe.barache(at)obspm.fr
Cesar Gattano, cesar.gattano(at)u-bordeaux.fr
SYRTE/Observatoire Paris/PSL/CNRS/Sorbonne Universite/LNE
61 avenue de l'Observatoire 75014 Paris
History:
* 26-Apr-2019: on-line version
* 02-May-2019: corrected version (from author)
(End) Christophe Barache [SYRTE-Paris Obs.], Patricia Vannier [CDS] 13-Mar-2019