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<ri:Resource created="2014-11-13T09:15:32Z" 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>MQS III: AGNs behind LMC and SMC</title><shortName>J/ApJ/775/92</shortName><identifier>ivo://CDS.VizieR/J/ApJ/775/92</identifier><altIdentifier>doi:10.26093/cds/vizier.17750092</altIdentifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Kozlowski S.</name></creator><creator><name>Onken C.A.</name></creator><creator><name>Kochanek C.S.</name></creator><creator><name>Udalski A.</name></creator><creator><name>Szymanski M.K.,Kubiak M.</name></creator><creator><name>Pietrzynski G.</name></creator><creator><name>Soszynski I.</name></creator><creator><name>Wyrzykowski L.</name></creator><creator><name>Ulaczyk K.,Poleski R.</name></creator><creator><name>Pietrukowicz P.</name></creator><creator><name>Skowron J.</name></creator><creator><name>(the OGLE Collaboration),Meixner M.</name></creator><creator><name>Bonanos A.Z.</name></creator><date role="Updated">2017-06-22T14:29:25Z</date><date role="Created">2014-11-13T09:15:32Z</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>surveys</subject><subject>magellanic-clouds</subject><subject>quasars</subject><subject>active-galactic-nuclei</subject><subject>infrared-photometry</subject><subject>visible-astronomy</subject><subject>photometry</subject><subject>redshifted</subject><description>The Magellanic Quasars Survey (MQS) has now increased the number of quasars known behind the Magellanic Clouds by almost an order of magnitude. All survey fields in the Large Magellanic Cloud (LMC) and 70% of those in the Small Magellanic Cloud (SMC) have been observed. The targets were selected from the third phase of the Optical Gravitational Lensing Experiment (OGLE-III) based on their optical variability, mid-IR, and/or X-ray properties. We spectroscopically confirmed 758 quasars (565 in the LMC and 193 in the SMC) behind the clouds, of which 94% (527 in the LMC and 186 in the SMC) are newly identified. The MQS quasars have long-term (12yr and growing for OGLE), high-cadence light curves, enabling unprecedented variability studies of quasars. The MQS quasars also provide a dense reference grid for measuring both the internal and bulk proper motions of the clouds, and 50 quasars are bright enough (I&lt;~18mag) for absorption studies of the interstellar/intergalactic medium of the clouds.</description><source format="bibcode">2013ApJ...775...92K</source><referenceURL>https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/775/92</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/J/ApJ/701/508">J/ApJ/701/508 : 5000 AGNs behind the Magellanic clouds (Kozlowski+, 2009)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJS/194/22">J/ApJS/194/22 : MQS. I. QSOs behind SMC (Kozlowski+, 2011)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJ/746/27">J/ApJ/746/27 : MQS. II. 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