J/ApJS/264/4 Candidate Double AGNs from Gaia & WISE (CDAGN) (Makarov+, 2023)
A catalog of candidate double and lensed quasars from Gaia and WISE data.
Makarov V.V., Secrest N.J.
<Astrophys. J. Suppl. Ser., 264, 4 (2023)>
=2023ApJS..264....4M 2023ApJS..264....4M
ADC_Keywords: Active gal. nuclei; QSOs; Photometry, infrared; Optical; Colors;
Redshifts; Gravitational lensing
Keywords: Active galactic nuclei ; Double quasars ; Astrometry ; Gaia
Abstract:
Making use of strong correlations between closely separated multiple
or double sources and photometric and astrometric metadata in Gaia
Early Data Release 3 (EDR3), we generate a catalog of candidate
double- and multiply imaged lensed quasars and active galactic nuclei
(AGNs), comprising 3140 systems. It includes two partially overlapping
parts: a sample of distant (redshifts mostly greater than 1) sources
with perturbed data; and systems that have been resolved into separate
components by Gaia at separations less than 2". For the first part,
which is roughly one-third of the published catalog, we synthesized
0.617 million redshifts using multiple machine-learning prediction and
classification methods, using independent photometric and astrometric
data from Gaia EDR3 and the Wide-field Infrared Survey Explorer, with
accurate spectroscopic redshifts from the Sloan Digital Sky Survey
(SDSS) as a training set. Using these synthetic redshifts, we estimate
a 4.9% rate of interlopers with spectroscopic redshifts below 1 in
this part of the catalog. Unresolved candidate double and dual AGNs
and quasars are selected as sources with a marginally high BP/RP
excess factor (photbprpexcessfactor), which is sensitive to source
extent, limiting our search to high-redshift quasars. For the second
part of the catalog, additional filters on measured parallax and
near-neighbor statistics are applied to diminish the propagation of
the remaining stellar contaminants. The estimated rate of the
positives (double or multiple sources) is 98%, and the estimated rate
of dual (physically related) quasars is greater than 54%. A few dozen
serendipitously found objects of interest are discussed in more
detail, including known and new lensed images, planetary nebulae,
young IR stars of peculiar morphology, and quasars with catastrophic
redshift errors in SDSS.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 109 3140 The candidate dual AGN (CDAGN) catalog
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See also:
IV/24 : Catalogue of Galactic Planetary Nebulae (Kohoutek, 2001)
II/328 : AllWISE Data Release (Cutri+ 2013)
VII/289 : SDSS quasar catalog, sixteenth data release (DR16Q) (Lyke+, 2020)
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
J/ApJS/117/361 : PNe in NRAO VLA Sky Survey (Condon+ 1998)
J/ApJS/165/1 : BAL QSOs from SDSS DR3 (Trump+, 2006)
J/ApJ/705/L76 : AGNs with double-peaked [OIII] lines (Wang+, 2009)
J/PASJ/62/525 : SiO maser survey off the Galactic Plane (Deguchi+, 2010)
J/ApJ/755/31 : Compilation of 122 strong gravitational lenses (Cao+, 2012)
J/ApJ/753/42 : Double-peaked AGN. I. Dual AGN candidates (Comerford+, 2012)
J/AJ/143/119 : SDSS Quasar Lens Search. V. Final catalog (Inada+, 2012)
J/A+A/544/A51 : R-band phot. of the lensed quasar UM673 (Koptelova+, 2012)
J/ApJ/746/L22 : Dual AGNs in the nearby Universe (Koss+, 2012)
J/A+A/582/A68 : Database of circumstellar OH masers (Engels+, 2015)
J/ApJS/221/12 : AGNs in the MIR using AllWISE data (Secrest+, 2015)
J/MNRAS/458/3479 : SVM selection of WISE YSO Candidates (Marton+, 2016)
J/ApJ/835/L30 : Dislodged AGNs (Makarov+, 2017)
J/MNRAS/466/3088 : Lensed and extended quasars (Williams+, 2017)
J/A+A/618/A56 : Gaia GraL. II. Known mult. imaged quasars (Ducourant+, 2018)
J/other/JAD/24.3 : Optically Variable Quasars in AllWISE/PS1 (Usatov, 2018)
J/A+A/622/A165 : Gaia GraL. III. New lensed systems (Delchambre+, 2019)
J/A+A/631/A87 : Close pairs of galaxies in MUSE Deep Fields (Ventou+, 2019)
J/A+A/631/A87 : Close pairs of galaxies in MUSE Deep Fields (Ventou+, 2019)
J/A+A/644/A159 : The third realization of the ICRF, ICRF3 (Charlot+, 2020)
J/A+A/638/A103 : Central stars of PNe in Gaia DR2 (Chornay+, 2020)
J/A+A/656/A51 : Planetary nebulae in Gaia EDR3 (Gonzalez-Santamaria+, 2021)
J/A+A/649/A3 : Gaia Early Data Release 3 phot. passbands (Riello+, 2021)
J/A+A/660/A16 : Quasars with large proper motions (Souchay+, 2022)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- WISEA WISEA identifier (JHHMMSS.ss+DDMMSS.s)
from Secrest+ (2015, J/ApJS/221/12)
21- 30 F10.6 deg RAdeg Gaia EDR3 right ascension (ICRS) at Ep=2016.0
32- 41 F10.6 deg DEdeg Gaia EDR3 declination (ICRS) at Ep=2016.0
43- 61 I19 --- Gaia Gaia EDR3 identifier
63- 68 F6.3 mag Gmag [11.42/21.12]? Gaia EDR3 G band magnitude
70- 74 F5.2 mag W1mag [5.2/17.6] WISE 3.4 micron band magnitude
76- 80 F5.2 mag W1-W2 [0.5/2.2] WISE 3.4-4.6 micron band color
82- 87 F6.3 --- E(BP/RP) [0.88/16.8]? Gaia EDR3 photbprpexcessfactor
value
89- 93 F5.3 --- z [0.058/6.7]? SDSS/BOSS redshift
95-100 F6.3 --- zpre [0.052/5]?=-1 Machine Learning (ML)-predicted
redshift from this work
102-103 I2 --- zcl [-1/1] ML-classified redshift from this work (1)
105-109 F5.2 arcsec sep [-1/2] Separation from nearest neighbor from
this work (Equal to "-1" if sep>2")
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Note (1): A wider range of Machine Learning (ML) classification methods was
applied to the training set in order to separate the sources into the
categories zcla=0 and zcla=1, which are defined as z<1 and z>1,
respectively. See Section 2.4.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 03-Mar-2023