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<ri:Resource created="2012-08-23T07:33:59Z" 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>Kohonen-selected unusual SDSS quasars</title><shortName>J/A+A/541/A77</shortName><identifier>ivo://CDS.VizieR/J/A+A/541/A77</identifier><altIdentifier>doi:10.26093/cds/vizier.35410077</altIdentifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Meusinger H.</name></creator><creator><name>Schalldach P.</name></creator><creator><name>Scholz R.-D.</name></creator><creator><name>in der Au A.</name></creator><creator><name>Newholm M.,de Hoon M.</name></creator><creator><name>Kaminsky B.</name></creator><date role="Updated">2019-10-08T06:13:27Z</date><date role="Created">2012-08-23T07:33:59Z</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>active-galactic-nuclei</subject><subject>stellar-spectral-types</subject><subject>quasars</subject><subject>redshifted</subject><description>Large spectroscopic surveys have discovered very peculiar and hitherto unknown types of active galactic nuclei (AGN). Such rare objects may hold clues to the accretion history of the supermassive black holes at the centres of galaxies. We aim to create a sizeable sample of unusual quasars from the unprecedented spectroscopic database of the Sloan Digital Sky Survey (SDSS).</description><source format="bibcode">2012A&amp;A...541A..77M</source><referenceURL>https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/541/A77</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/VII/260">VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)</relatedResource><relatedResource>http://www.sdss.org : SDSS Home 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Redshift from present study</description><ucd>src.redshift</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>q_z</name><description>[0/3] Redshift uncertainty flag, 0=certain (2)</description><ucd>meta.code.qual;src.redshift</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>i0mag</name><description>i magnitude, corrected for galactic extinction (3)</description><unit>mag</unit><ucd>phot.mag;em.opt.I</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>iMAG</name><description>? Absolute i magnitude (4)</description><unit>mag</unit><ucd>phys.magAbs</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>fr</name><description>[0/1] FIRST detection flag, 0=detection (5)</description><unit>mag</unit><ucd>meta.code</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>F1.4</name><description>? FIRST 1.4GHz peak flux</description><unit>mJy</unit><ucd>phot.flux.density;em.radio.750-1500MHz</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>Ri</name><description>? Radio loudness parameter (6)</description><ucd>phot.flux;arith.ratio</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>chi2</name><description>? 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