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<ri:Resource created="2024-03-13T08:00:58Z" 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>Large Quasar Astrometric Catalogue 6, LQAC-6</title><shortName>J/A+A/683/A112</shortName><identifier>ivo://CDS.VizieR/J/A+A/683/A112</identifier><altIdentifier>doi:10.26093/cds/vizier.36830112</altIdentifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Souchay J.</name></creator><creator><name>Secrest N.</name></creator><creator><name>Sexton R.</name></creator><creator><name>Barache C.</name></creator><date role="Updated">2024-11-29T20:01:01Z</date><date role="Created">2024-03-13T08:00:58Z</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>astronomical-object-identification</subject><subject>active-galactic-nuclei</subject><subject>photometry</subject><subject>astrometry</subject><subject>redshifted</subject><subject>absolute-magnitude</subject><subject>galaxy-classification-systems</subject><description>In addition to being objects of intense interest for cosmology and studies of the evolution of the universe, quasars are used to define quasi-inertial positions on the celestial sphere. Since its first publication in 2009, the purpose of the Large Quasar Astrometric Catalogue (LQAC) has been to provide the largest catalogue of bona fide quasars suitable for astrometry, with the high-precision positions from Gaia becoming available in the fourth release (LQAC-4). Following the same kind of procedure as in the previous releases of the LQAC, our aim is to compile the maximum number of recorded quasars, with optimised equatorial coordinates and fundamental information about their physical properties such as the redshift, the photometry, radio fluxes, morphological index. New quasars from the SDSS DR16Q release were cross-matched with the precedent LQAC-5 compilation with a 1" radius, which leads to 225082 objects not present in the previous LQAC-5 release. Another cross-match was done with the Gaia Celestial Reference Frame 3 (GCRF3) catalogue, which is itself a compilation of a large number of quasars catalogues, accompanied with very accurate Gaia DR3 positions. Moreover, AGN's coming from 19 individual extragalactic surveys not considered in the previous LQAC compilations are added. This new LQAC-6 release contains 2073099 objects, which is 3.5 times the number of objects recorded in the previous LQAC-5 release. Among them, 1739187 objects were found in common with the Gaia DR3, within a 1" search radius. A large part of new objects belong to the GCRF3 catalogue, which gathers a total number of 1614218 objects. The LQAC-6 delivers a nearly complete catalogue of quasars and AGN's to the astronomical community, with the aim of giving their best equatorial coordinates with respect to the recent ICRF3 and with exhaustive additional information. For as much as 83.9% of the sample, these coordinates are extracted from the very recent Gaia DR3.</description><source format="bibcode">2024A&amp;A...683A.112S</source><referenceURL>https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/683/A112</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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39906-39907 39918 39920 39923 39946 39949-39951 39970 39973-39975 40066 40068-40069 40071 40096 40101 40103 40106 40109 40111 40453 40455 40458 40461 40463 40494 40578 40592-40593 40595 40601 40603 40609 40611 40615-40616 40619-40621 40633 40635-40637 40639 41212-41214 41384 41386-41390 41396-41397 41399-41401 41404 41436 41439-41442 41444-41446 41456 41460 41464 41524-41526 41528-41530 41532-41533 41548-41549 41552 41554-41555 41560 41568-41569 41572 41574 41578 41586 41612-41613 41617-41619 41623 41632-41633 41646 41649-41650 41665 41669 41679 41684 41687 41701 41717 41725-41730 41733 41736 41738 41740 41757 41786-41787 41790 41793 41796 41805 41817-41818 41824 41839 41846 41849 41870 41876-41877 41881 41883 41886 41891 41894 41896-41897 41899 41901-41903 41926-41929 41931 41937-41939 42088-42090 42108-42109 42117-42121 42124 42132-42133 42161 42168 42176-42177 42179-42180 42188 42228 42232 42238 42272-42274 42276 42278 42281 42284 42288-42289 42292 42312-42313 42315 42317 42324-42325 42329-42330 42332 42350 42366 42369 42375 42388 42394 42411 42432-42433 42443 42446 42450 42456 42469 42471 42481-42482 42484 42492 42504 42515 42535 42537-42539 42545-42547 42565 42571 42579 42586 42589 42591 42595 42609-42610 42612-42614 42762-42763 42766 42768 42770 42773 42776 42779 42782-42783 42790-42791 42818-42820 42822 42824-42825 42827-42828 42834 42841-42845 42852-42853 42855 42868-42870 42957-42958 42968-42969 42971-42973 42975 42980-42982 42992-42993 42995 43027 43037-43038 43042-43043 43046-43047 43063-43064 43066-43067 43069-43071 43073 43075 43083 43085 43087-43088 43090-43091 43096 43098-43099 43147 43169-43171 47788-47789 47791-47793 47795</spatial><spectral>1.3252139338088282e-25 3.916500758235022e-19</spectral><footprint ivo-id="ivo://ivoa.net/std/moc">https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/683/A112?format=ascii</footprint><waveband>Optical</waveband></coverage><tableset><schema><name>default</name><table><name>J/A+A/683/A112/lqac6</name><description>6th release of LQAC</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>LQACN</name><description>Source number order in lqac-6</description><ucd>meta.id;meta.main</ucd><dataType xsi:type="vs:VOTableType">int</dataType><flag>indexed</flag></column><column><name>LQAC5</name><description>LQAC-5 name given for each object based on equatorial coordinates</description><ucd>meta.id</ucd><dataType xsi:type="vs:VOTableType" arraysize="16*">char</dataType></column><column><name>LQACDet</name><description>First LQAC detected Flag to recognize already recorded or new sources (1)</description><ucd>meta.code</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>OName</name><description>Name of the quasar in the original catalog or original catalog name (2)</description><ucd>meta.id</ucd><dataType xsi:type="vs:VOTableType" arraysize="31*">char</dataType></column><column><name>Nature</name><description>Nature of the object (3)</description><ucd>meta.code.class</ucd><dataType xsi:type="vs:VOTableType" arraysize="6*">char</dataType></column><column><name>CatFlags</name><description>Flags indicating the presence of the quasar in the catalogs belonging to the compilation (8)</description><ucd>meta.code</ucd><dataType xsi:type="vs:VOTableType" arraysize="33*">char</dataType></column><column><name>GaiaDR3Prob</name><description>? Quasar probability in Gaia-DR3 (9)</description><ucd>stat.fit.goodness</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>GaiaDR3Obs</name><description>Number of Observations in Gaia-DR3</description><ucd>meta.number</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>GRF3Flag</name><description>Presence in Gaia GCRF3 (13)</description><ucd>meta.code</ucd><dataType xsi:type="vs:VOTableType" arraysize="5*">char</dataType></column><column><name>DR3Class</name><description>? Classification of quasar given in GAIA DR3</description><ucd>src.class</ucd><dataType xsi:type="vs:VOTableType" arraysize="12*">char</dataType></column><column><name>RAOdeg</name><description>Right ascension (J2000) in original catalog or ICRS, Ep=2016.0 for new sources GCRF3 (4)</description><unit>deg</unit><ucd>pos.eq.ra</ucd></column><column><name>DEOdeg</name><description>Declination (J2000) in original catalog or ICRS, Ep=2016.0 for new sources GCRF3 (4)</description><unit>deg</unit><ucd>pos.eq.dec</ucd></column><column><name>_RA.icrs</name><description>Right ascension (ICRS) at Epoch=J2000, proper motions taken into account</description><unit>deg</unit><ucd>pos.eq.ra</ucd><flag>indexed</flag></column><column><name>_DE.icrs</name><description>Declination (ICRS) at Epoch=J2000, proper motions taken into account</description><unit>deg</unit><ucd>pos.eq.dec</ucd><flag>indexed</flag></column><column><name>Source</name><description>Source of the following optimized equatorial coordinates (5)</description><ucd>meta.code</ucd><dataType xsi:type="vs:VOTableType" arraysize="5*">char</dataType></column><column><name>RAJ2000</name><description>Optimized Right ascension (J2000) or ICRS Ep=2016 for Source=DR3 (6)</description><unit>deg</unit><ucd>pos.eq.ra;meta.main</ucd><flag>indexed</flag></column><column><name>DEJ2000</name><description>Optimized Declination (J2000) or ICRS Ep=2016 for Source=DR3 (6)</description><unit>deg</unit><ucd>pos.eq.dec;meta.main</ucd><flag>indexed</flag></column><column><name>RAGdeg</name><description>? Right ascension in GaiaDR3 (ICRS, Ep=2016.0)</description><unit>deg</unit><ucd>pos.eq.ra</ucd><flag>nullable</flag></column><column><name>e_RAGdeg</name><description>? Uncertainity in (alpha)xcos(delta) in Gaia DR3 (7)</description><unit>mas</unit><ucd>stat.error</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>DEGdeg</name><description>? Declination in Gaia DR3 (ICRS, Ep=2016.0)</description><unit>deg</unit><ucd>pos.eq.dec</ucd><flag>nullable</flag></column><column><name>e_DEGdeg</name><description>? Uncertainty in delta in Gaia DR3 (7)</description><unit>mas</unit><ucd>stat.error</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>rho1</name><description>? Correlation right ascension and declination</description><ucd>stat.correlation</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>epos</name><description>? Sigma position</description><unit>mas</unit><ucd>stat.stdev;pos</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>plx</name><description>? Parallax in Gaia DR3</description><unit>mas</unit><ucd>pos.parallax.trig</ucd><dataType xsi:type="vs:VOTableType">double</dataType><flag>nullable</flag></column><column><name>e_plx</name><description>? Uncertainty Parallax in Gaia DR3</description><unit>mas</unit><ucd>stat.error;pos.parallax</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>pmRA</name><description>? Proper Motion in Right ascension in Gaia DR3 (mu_alpha x cos delta)</description><unit>mas/yr</unit><ucd>pos.pm;pos.eq.ra</ucd><dataType xsi:type="vs:VOTableType">double</dataType><flag>nullable</flag></column><column><name>e_pmRA</name><description>? Uncertainty in Proper Motion in Right ascension in Gaia DR3</description><unit>mas/yr</unit><ucd>stat.error;pos.pm;pos.eq.ra</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>pmDE</name><description>? Proper Motion in Declination in Gaia DR3</description><unit>mas/yr</unit><ucd>pos.pm;pos.eq.dec</ucd><dataType xsi:type="vs:VOTableType">double</dataType><flag>nullable</flag></column><column><name>e_pmDE</name><description>? Uncertainty in Proper Motion in Declination in Gaia DR3</description><unit>mas/yr</unit><ucd>stat.error;pos.pm;pos.eq.dec</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>rho2</name><description>? Correlation between proper motion in right ascension and proper motion in declination</description><ucd>stat.correlation</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>pmtot</name><description>? Total proper motion</description><unit>mas/yr</unit><ucd>pos.pm</ucd><dataType xsi:type="vs:VOTableType">double</dataType><flag>nullable</flag></column><column><name>pmChi</name><description>? Chi Proper Motion</description><ucd>stat.fit.chi2</ucd><dataType xsi:type="vs:VOTableType">double</dataType><flag>nullable</flag></column><column><name>Gmag</name><description>? Photometric magnitude in Optical G in Gaia DR3 band</description><unit>mag</unit><ucd>phot.mag;em.opt</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>BPmag</name><description>? Photometric magnitude in Optical BP in Gaia DR3 band</description><unit>mag</unit><ucd>phot.mag;em.opt.B</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>RPmag</name><description>? Photometric magnitude in Optical RP in Gaia DR3 band</description><unit>mag</unit><ucd>phot.mag;em.opt.R</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>zorigin</name><description>? Redshift in Original catalogue</description><ucd>src.redshift;pos.heliocentric</ucd><dataType xsi:type="vs:VOTableType">double</dataType><flag>nullable</flag><flag>indexed</flag></column><column><name>zDR3</name><description>? Redshift Nominal Gaia DR3</description><ucd>src.redshift;pos.heliocentric</ucd><dataType xsi:type="vs:VOTableType">double</dataType><flag>nullable</flag></column><column><name>b_zDR3</name><description>? Redshift Minimum Gaia DR3</description><ucd>src.redshift;stat.min</ucd><dataType xsi:type="vs:VOTableType">double</dataType><flag>nullable</flag></column><column><name>B_zDR3</name><description>? Redshift Maximum Gaia DR3</description><ucd>src.redshift;stat.max</ucd><dataType xsi:type="vs:VOTableType">double</dataType><flag>nullable</flag></column><column><name>PhotFlags</name><description>Flags Photometry (14)</description><ucd>meta.code</ucd><dataType xsi:type="vs:VOTableType" arraysize="15*">char</dataType></column><column><name>FUV</name><description>? F UV FLUX (AB) magnitude</description><unit>mag</unit><ucd>phot.mag;em.UV.100-200nm</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>W3mag</name><description>? Photometric magnitude in Infrared W3 band 12 um (12)</description><unit>mag</unit><ucd>phot.flux.density;em.IR.8-15um</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>W4mag</name><description>? Photometric magnitude in Infrared W4 band (W4) 22 um (12)</description><unit>mag</unit><ucd>phot.flux.density;em.IR.15-30um</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>S15</name><description>? Radio flux between 100 and 200MHz</description><unit>mJy</unit><ucd>phot.flux.density;em.radio.100-200MHz</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>XNUV</name><description>? XN UV FLUX (AB) magnitude</description><unit>mag</unit><ucd>phot.mag;em.UV</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>umag</name><description>? Photometric magnitude in Optical u band between 300 and 400 nm (10)</description><unit>mag</unit><ucd>phot.mag;em.opt.U</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>gmag</name><description>? Photometric magnitude in Optical g band between 400 and 500 nm (10)</description><unit>mag</unit><ucd>phot.mag;em.opt.B</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>rmag</name><description>? Photometric magnitude in Optical r band between 600 and 750 nm (10)</description><unit>mag</unit><ucd>phot.mag;em.opt.R</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>imag</name><description>? Photometric magnitude in Optical i band between 750 and 1000 nm (10)</description><unit>mag</unit><ucd>phot.mag;em.opt.I</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>zmag</name><description>? Photometric magnitude in Optical z band between 800 and 1000 nm (10)</description><unit>mag</unit><ucd>phot.mag;em.opt.I</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>Ymag</name><description>? Photometric magnitude in Optical Y band between 500 and 600 nm (10)</description><unit>mag</unit><ucd>phot.mag;em.IR.J</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>Jmag</name><description>? Photometric magnitude in Infrared J band between 1000 and 1500 nm (11)</description><unit>mag</unit><ucd>phot.mag;em.IR.J</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>Hmag</name><description>? Photometric magnitude in Infrared H band between 1500 and 2000 nm (11)</description><unit>mag</unit><ucd>phot.mag;em.IR.H</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>Kmag</name><description>? Photometric magnitude in Infrared K band between 2000 and 3000 nm (11)</description><unit>mag</unit><ucd>phot.mag;em.IR.K</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>W1mag</name><description>? Photometric magnitude in Infrared W1 band 3.4 um (12)</description><unit>mag</unit><ucd>phot.mag;em.IR.3-4um</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>W2mag</name><description>? Photometric magnitude in Infrared W2 band 4.6 um (12)</description><unit>mag</unit><ucd>phot.mag;em.IR.4-8um</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>S84</name><description>? Radio flux between 750 and 1500MHz</description><unit>mJy</unit><ucd>phot.flux.density;em.radio.1500-3000MHz</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>S90</name><description>? Radio flux between 750 and 1500Mhz</description><unit>mJy</unit><ucd>phot.flux.density;em.IR.60-100um</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>S14</name><description>? Radio flux between 750 and 1500MHz</description><unit>mJy</unit><ucd>phot.flux.density;em.radio.1500-3000MHz</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>S3</name><description>? Radio flux between 1500 and 3000MHz</description><unit>mJy</unit><ucd>phot.flux.density;em.radio.1500-3000MHz</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>I1B</name><description>? Sharp morphology index in band B</description><ucd>src.morph.param</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>I2B</name><description>? Sround morphology index in band B</description><ucd>src.morph.param</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>I3B</name><description>? Ground morphology index in band B</description><ucd>src.morph.param</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>I1R</name><description>? Sharp morphology index in band R</description><ucd>src.morph.param</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>I2R</name><description>? Sround morphology index in band R</description><ucd>src.morph.param</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>I3R</name><description>? Ground morphology index in band R</description><ucd>src.morph.param</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>I1I</name><description>? Sharp morphology index in band I</description><ucd>src.morph.param</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>I2I</name><description>? Sround morphology index in band I</description><ucd>src.morph.param</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>I3I</name><description>? Ground morphology index in band I</description><ucd>src.morph.param</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>uMAG</name><description>? Absolute magnitude in band u</description><unit>mag</unit><ucd>phys.magAbs</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>gMAG</name><description>? Absolute magnitude in band g</description><unit>mag</unit><ucd>phys.magAbs</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>rMAG</name><description>? Absolute magnitude in band r</description><unit>mag</unit><ucd>phys.magAbs</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>iMAG</name><description>? Absolute magnitude in band i</description><unit>mag</unit><ucd>phys.magAbs</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column></table></schema></tableset></ri:Resource>