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<ri:Resource created="2024-12-09T09:21:21Z" status="active" updated="2025-05-19T09:50:00Z" version="1.2" xmlns:cs="http://www.ivoa.net/xml/ConeSearch/v1.0" xmlns:ri="http://www.ivoa.net/xml/RegistryInterface/v1.0" xmlns:vr="http://www.ivoa.net/xml/VOResource/v1.0" xmlns:vs="http://www.ivoa.net/xml/VODataService/v1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.ivoa.net/xml/ConeSearch/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/ConeSearch.xsd http://www.ivoa.net/xml/VOResource/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/VOResource.xsd http://www.ivoa.net/xml/VODataService/v1.1 http://vo.ari.uni-heidelberg.de/docs/schemata/VODataService.xsd" xsi:type="vs:CatalogService"><title>DULAG. A DUal and Lensed AGN candidate catalog</title><shortName>J/A+A/692/A154</shortName><identifier>ivo://CDS.VizieR/J/A+A/692/A154</identifier><altIdentifier>doi:10.26093/cds/vizier.36920154</altIdentifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Wu Q.</name></creator><creator><name>Scialpi M.</name></creator><creator><name>Liao S.</name></creator><creator><name>Mannucci F.</name></creator><creator><name>Qi Z.</name></creator><date role="Updated">2025-02-26T20:02:16Z</date><date role="Created">2024-12-09T09:21:21Z</date><contact><name>CDS support team</name><address>CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France</address><email>cds-question@unistra.fr</email></contact></curation><content><subject>quasars</subject><subject>gravitational-lensing</subject><subject>photometry</subject><subject>visible-astronomy</subject><subject>infrared-astronomy</subject><subject>redshifted</subject><description>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><source format="bibcode">2024A&amp;A...692A.154W</source><referenceURL>https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/692/A154</referenceURL><type>Catalog</type><contentLevel>Research</contentLevel><relationship><relationshipType>IsServedBy</relationshipType><relatedResource ivo-id="ivo://CDS.VizieR/TAP">TAP VizieR generic service</relatedResource></relationship><relationship><relationshipType>IsServedBy</relationshipType><relatedResource>Conesearch service</relatedResource></relationship><relationship><relationshipType>related-to</relationshipType><relatedResource ivo-id="ivo://CDS.VizieR/I/355">I/355 : Gaia DR3 Part 1. 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47077 47082 47104 47125 47140 47147 47155 47165 47168 47179 47183 47202 47205 47209 47220 47232 47243-47244 47253 47259-47260 47266-47267 47273 47275 47282-47283 47287 47313 47320 47324 47331 47341 47358 47388 47407 47419 47424 47429 47432 47434 47442 47451 47454 47509 47513 47527 47583 47591 47594-47595 47614-47615 47620 47626 47628 47630-47631 47641 47643 47649-47651 47657 47661 47663 47667 47670 47672-47673 47676-47678 47680 47682-47683 47685 47687 47695 47697 47710 47712-47714 47726 47728 47730 47742 47747-47748 47750-47751 47753 47755-47757 47759 47762 47764 47766 47770-47772 47774-47775 47781-47783 47785 47793 47795 47805 47811 47813 47815 47821 47824-47825 47828 47830-47833 47835 47844-47845 47847-47849 47852-47853 47857-47859 47876 47892 47894-47895 47916 47918-47922 47924 47932 47934 47936 47945 47966 47971 47983 47999 48002 48005-48006 48012-48014 48016-48018 48022-48024 48026 48032-48033 48035 48044-48046 48048 48050 48054-48055 48057 48066-48067 48070 48073 48075-48077 48085 48089 48092 48096-48097 48102-48103 48107 48113 48118-48119 48122 48139 48146 48150 48163 48278-48279 48299 48330 48388 48398 48400 48430 48434 48439 48444 48450 48455 48464 48474 48498 48517 48528-48529 48534 48537 48557 48560 48566 48569 48591 48594 48638 48650 48659 48664 48677 48679 48695 48697-48698 48706 48709 48719 48729 48750 48768 48794 48814 48826 48871 48882 48892 48899 48902-48903 48905 48907 48909 48914 48942 48952 48957 48964 48998 49003 49019 49032 49066 49074 49081 49087 49094 49117 49136-49137 49142 49149</spatial><spectral>1.9867573869263685e-19 3.916500758235022e-19</spectral><footprint ivo-id="ivo://ivoa.net/std/moc">https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/692/A154?format=ascii</footprint><waveband>Optical</waveband><waveband>Infrared</waveband></coverage><tableset><schema><name>default</name><table><name>J/A+A/692/A154/golden</name><description>Golden sample</description><column><name>recno</name><description>Record number assigned by the VizieR team. Should Not be used for identification.</description><ucd>meta.record</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>GaiaDR3</name><description>Gaia DR3 unique id (source_id)</description><ucd>meta.id;meta.main</ucd></column><column><name>RA_ICRS</name><description>Right ascension in Gaia (ICRS) at Ep=2016 (ra)</description><unit>deg</unit><ucd>pos.eq.ra;meta.main</ucd></column><column><name>DE_ICRS</name><description>Declination in Gaia (ICRS) at Ep=2016 (dec)</description><unit>deg</unit><ucd>pos.eq.dec;meta.main</ucd></column><column><name>Gmag</name><description>G-band mean magnitude in Gaia (phot_g_mean_mag)</description><unit>mag</unit><ucd>phot.mag;em.opt</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>RPlx</name><description>? Normalised parallax (parallax_over_error)</description><ucd>stat.fit.omc</ucd><dataType xsi:type="vs:VOTableType">double</dataType><flag>nullable</flag></column><column><name>Rpm</name><description>? Normalised proper motion (proper motion_over_error)</description><ucd>stat.fit.omc</ucd><dataType xsi:type="vs:VOTableType">double</dataType><flag>nullable</flag></column><column><name>BP-G</name><description>? Gaia BP-G color (bp_g)</description><unit>mag</unit><ucd>phot.color;em.opt;em.opt</ucd><dataType xsi:type="vs:VOTableType">double</dataType><flag>nullable</flag></column><column><name>G-RP</name><description>? Gaia G-RP color (g_rp)</description><unit>mag</unit><ucd>phot.color;em.opt;em.opt</ucd><dataType xsi:type="vs:VOTableType">double</dataType><flag>nullable</flag></column><column><name>W1-W2</name><description>? CatWISE W1-W2 color (w1_w2)</description><unit>mag</unit><ucd>phot.color;em.IR;em.IR</ucd><dataType xsi:type="vs:VOTableType">double</dataType><flag>nullable</flag></column><column><name>Class</name><description>[qc] Class of the spectroscopically identified result q(quasar)/c(candidate) (class)</description><ucd>meta.code.class</ucd><dataType xsi:type="vs:VOTableType" arraysize="1*">char</dataType></column><column><name>IPDfmp</name><description>Gaia percent of source with more than one peak (ipd_frac_multi_peak)</description><ucd>stat.fit.param</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>FlagGaia</name><description>QSO quality flag by Gaia spectra (gaia_spectra_flag)</description><ucd>meta.code.error</ucd><dataType xsi:type="vs:VOTableType" arraysize="15*">char</dataType></column><column><name>FlagVari</name><description>QSO quality flag by Gaia light variation (gaia_vari_flag)</description><ucd>meta.code.error</ucd><dataType xsi:type="vs:VOTableType" arraysize="15*">char</dataType></column><column><name>NNeigh</name><description>Number of Gaia neighbors with a radius of 5" (n_neighbor_source)</description><ucd>meta.number</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>Comment</name><description>Reasons for multiple neighbors (neighbor_source_comment)</description><ucd>meta.note</ucd><dataType xsi:type="vs:VOTableType" arraysize="19*">char</dataType></column><column><name>z</name><description>? Redshift (z)</description><ucd>src.redshift</ucd><dataType xsi:type="vs:VOTableType">double</dataType><flag>nullable</flag></column><column><name>r_z</name><description>Reference catalog of the redshift (z_reference)</description><ucd>meta.ref;pos.frame</ucd><dataType xsi:type="vs:VOTableType" arraysize="13*">char</dataType></column><column><name>IdentClass</name><description>Class of AGN pairs identified by literature (identified_class)</description><ucd>meta.code.class</ucd><dataType xsi:type="vs:VOTableType" arraysize="20*">char</dataType></column><column><name>r_IdentClass</name><description>Literature bibcode for class of AGN pairs (identified_class_bibcode)</description><ucd>meta.ref;pos.frame</ucd><dataType xsi:type="vs:VOTableType" arraysize="19*">char</dataType></column></table><table><name>J/A+A/692/A154/superset</name><description>Superset</description><column><name>DE_ICRS</name><description>Declination in Gaia (ICRS) at Ep=2016 (dec)</description><unit>deg</unit><ucd>pos.eq.dec;meta.main</ucd></column><column><name>Gmag</name><description>G-band mean magnitude in Gaia (phot_g_mean_mag)</description><unit>mag</unit><ucd>phot.mag;em.opt</ucd><dataType xsi:type="vs:VOTableType">double</dataType></column><column><name>RPlx</name><description>? Normalised parallax (parallax_over_error)</description><ucd>stat.fit.omc</ucd><dataType xsi:type="vs:VOTableType">double</dataType><flag>nullable</flag></column><column><name>Rpm</name><description>? Normalised proper mption (proper motion_over_error)</description><ucd>stat.fit.omc</ucd><dataType xsi:type="vs:VOTableType">double</dataType><flag>nullable</flag></column><column><name>BP-G</name><description>? Gaia BP-G color (bp_g)</description><unit>mag</unit><ucd>phot.color;em.opt;em.opt</ucd><dataType xsi:type="vs:VOTableType">double</dataType><flag>nullable</flag></column><column><name>G-RP</name><description>? Gaia G-RP color (g_rp)</description><unit>mag</unit><ucd>phot.color;em.opt;em.opt</ucd><dataType xsi:type="vs:VOTableType">double</dataType><flag>nullable</flag></column><column><name>W1-W2</name><description>? CatWISE W1-W2 color (w1_w2)</description><unit>mag</unit><ucd>phot.color;em.IR;em.IR</ucd><dataType xsi:type="vs:VOTableType">double</dataType><flag>nullable</flag></column><column><name>Class</name><description>Class of the spectroscopically identified result (class)</description><ucd>meta.code.class</ucd><dataType xsi:type="vs:VOTableType" arraysize="1*">char</dataType></column><column><name>IPDfmp</name><description>Gaia percent of source with more than one peak (ipd_frac_multi_peak)</description><unit>%</unit><ucd>stat.fit.param</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>recno</name><description>Record number assigned by the VizieR team. Should Not be used for identification.</description><ucd>meta.record</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>GaiaDR3</name><description>Gaia DR3 unique id (source_id)</description><ucd>meta.id;meta.main</ucd></column><column><name>RA_ICRS</name><description>Right ascension in Gaia (ICRS) at Ep=2016 (ra)</description><unit>deg</unit><ucd>pos.eq.ra;meta.main</ucd></column></table></schema></tableset></ri:Resource>