J/A+A/692/A154 DULAG. A DUal and Lensed AGN candidate catalog (Wu+, 2024)
DULAG: A DUal and Lensed AGN candidate catalog with Gaia multipeak method.
Wu Q., Scialpi M., Liao S., Mannucci F., Qi Z.
<Astron. Astrophys. 692, A154 (2024)>
=2024A&A...692A.154W 2024A&A...692A.154W (SIMBAD/NED BibCode)
ADC_Keywords: QSOs ; Gravitational lensing ; Photometry ; Optical ; Infrared ;
Redshifts
Keywords: methods: data analysis - methods: statistical - catalogs -
astrometry - quasars: general
Abstract:
A series of studies have demonstrated that the Gaia multipeak method
(GMP) is a very efficient technique to select active galactic nucleus
(AGN) pair candidates. The number of candidates is determined by the
size of the input AGN catalogs, usually limited to
spectroscopically-confirmed objects.
The objective of this work is to compile a larger and highly reliable
catalog of GMP pair candidates extracted from the six million objects
the Gaia AGN catalog, the majority of which lack spectroscopic
information.
In order to ascertain the differences in the properties of GMP pair
candidates compared to normal AGN, we conducted an investigation
utilising samples of GMP AGN. These differences were employed to
establish the optimal selecting criteria, which ultimately led to the
identification of a highly reliable candidate catalog.
We found significant differences in astrometry and multi-band colour
distribution between normal AGN and GMP pair candidates. A
comprehensive GMP pair candidate catalog comprising 5286 sources was
ultimately compiled, accompanied by a highly reliable Golden sample of
1867 sources. A total of 37 sources in the Golden sample have been
identified as dual AGN or lensed AGN. For the majority of sources in
the Golden sample, we provide reference redshifts and find three close
AGN pair candidates among them.
Description:
We provide two catalogs, one is a superset containing 5286 sources,
with high completeness but low purity. The other is the Golden sample,
a catalog of 1867 GMP AGN pair candidates with high purity.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
golden.dat 227 1867 Golden sample
superset.dat 109 5286 Superset
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See also:
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
Byte-by-byte Description of file: golden.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 I19 --- GaiaDR3 Gaia DR3 unique id (source_id)
21- 30 F10.6 deg RAdeg Right ascension in Gaia (ICRS)
at Ep=2016 (ra)
32- 41 F10.6 deg DEdeg Declination in Gaia (ICRS) at Ep=2016 (dec)
43- 51 F9.6 mag Gmag G-band mean magnitude in Gaia
(photgmean_mag)
53- 62 E10.2 --- RPlx ?=- Normalised parallax
(parallaxovererror)
64- 73 F10.6 --- Rpm ?=- Normalised proper motion
(proper motionovererror)
75- 84 E10.2 mag BP-G ?=- Gaia BP-G color (bp_g)
86- 93 F8.6 mag G-RP ?=- Gaia G-RP color (g_rp)
95-103 F9.6 mag W1-W2 ?=- CatWISE W1-W2 color (w1_w2)
105 A1 --- Class [qc] Class of the spectroscopically
identified result q(quasar)/c(candidate)
(class)
107-108 I2 --- IPDfmp Gaia percent of source with more than one
peak (ipdfracmulti_peak)
110-124 A15 --- FlagGaia QSO quality flag by Gaia spectra
(gaiaspectraflag)
126-140 A15 --- FlagVari QSO quality flag by Gaia light variation
(gaiavariflag)
142-143 I2 --- NNeigh Number of Gaia neighbors with a radius of
5" (nneighborsource)
145-163 A19 --- Comment Reasons for multiple neighbors
(neighborsourcecomment)
165-172 F8.6 --- z ?=- Redshift (z)
174-186 A13 --- r_z Reference catalog of the redshift
(z_reference)
188-207 A20 --- IdentClass Class of AGN pairs identified by literature
(identified_class)
209-227 A19 --- r_IdentClass Literature bibcode for class of AGN pairs
(identifiedclassbibcode)
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Byte-by-byte Description of file: superset.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 I19 --- GaiaDR3 Gaia DR3 unique id (source_id)
21- 30 F10.6 deg RAdeg Right ascension in Gaia (ICRS) at Ep=2016 (ra)
32- 41 F10.6 deg DEdeg Declination in Gaia (ICRS) at Ep=2016 (dec)
43- 51 F9.6 mag Gmag G-band mean magnitude in Gaia
(photgmean_mag)
53- 62 E10.2 --- RPlx ?=- Normalised parallax (parallaxovererror)
64- 73 F10.6 --- Rpm ?=- Normalised proper mption
(proper motionovererror)
75- 84 E10.2 mag BP-G ?=- Gaia BP-G color (bp_g)
86- 93 F8.6 mag G-RP ?=- Gaia G-RP color (g_rp)
95-103 F9.6 mag W1-W2 ?=- CatWISE W1-W2 color (w1_w2)
105 A1 --- Class Class of the spectroscopically identified
result (class)
107-109 I3 % IPDfmp Gaia percent of source with more than one peak
(ipdfracmulti_peak)
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Acknowledgements:
Qiqi Wu, wuqiqi(at)shao.ac.cn
This work has made use of data from the European Space Agency (ESA)
mission Gaia, Wide-field Infrared Survey Explorer (WISE) and Sloan
Digital Sky Survey (SDSS). We are also very grateful to the developers
of the TOPCAT (Taylor 2005) software and SIMBAD astronomical database.
This work has been supported by the Strategic Priority Research
Program of the Chinese Academy of Sciences, Grant No.XDA0350205, the
National Natural Science Foundation of China (NSFC) through grants
12173069, the Youth Innovation Promotion Association CAS with
Certificate Number 2022259, the Talent Plan of Shanghai Branch,
Chinese Academy of Sciences with No.CASSHB-QNPD-2023-016. Part of this
work was supported by the German Deutsche Forschungsgemeinschaft, DFG
project number Ts 17/2-1. We acknowledge the science research grants
from the China Manned Space Project with NO. CMS-CSST-2021-A12 and
NO.CMS-CSST-2021-B10.
This publication was produced as part of the PhD program in Space
Science and Technology at the University of Trento, Cycle XXXIX, with
the support of a scholarship financed by the Ministerial Decree no.
118 of 2nd march 2023, based on the NRRP - funded by the European
Union - NextGenerationEU - Mission 4 "Education and Research",
Component 1 "Enhancement of the offer of educational services: from
nurseries to universities" - Investment 4.1 "Extension of the
number of research doctorates and innovative doctorates for public
administration and cultural heritage".
(End) Patricia Vannier [CDS] 08-Nov-2024