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<ri:Resource created="2011-12-08T13:51:03Z" 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>Ultra-luminous infrared galaxies in SDSS-DR6</title><shortName>J/ApJ/704/789</shortName><identifier>ivo://CDS.VizieR/J/ApJ/704/789</identifier><altIdentifier>doi:10.26093/cds/vizier.17040789</altIdentifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Hou L.G.</name></creator><creator><name>Wu X.-B.</name></creator><creator><name>Han J.L.</name></creator><date role="Updated">2017-10-13T15:41:01Z</date><date role="Created">2011-12-08T13:51:03Z</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>galaxies</subject><subject>infrared-sources</subject><subject>active-galactic-nuclei</subject><subject>surveys</subject><subject>spectroscopy</subject><description>Ultra-luminous infrared galaxies (ULIRGs) are interesting objects with dramatic properties. Many efforts have been made to understand the physics of their luminous infrared emission and evolutionary stages. However, a large ULIRG sample is still needed to study the properties of their central black holes (BHs), the BH-host galaxy relation, and their evolution. We identified 308 ULIRGs from the Sloan Digital Sky Survey Data Release 6, and classified them into the NL ULIRGs (with only narrow emission lines) and the Type I ULIRGs (with broad emission lines). About 56% of ULIRGs in our total sample show interaction features, and this percentage is 79% for redshift z&lt;0.2. Optical identifications of these ULIRGs show that the active galactic nucleus percentage is at least 49%, and the percentage increases with the infrared luminosity. We found 62 Type I ULIRGs, and estimated their BH masses and velocity dispersions from their optical spectra. Together with known Type I ULIRGs in the literature, a sample of 90 Type I ULIRGs enables us to make a statistical study.</description><source format="bibcode">2009ApJ...704..789H</source><referenceURL>https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/704/789</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/II/294">II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/II/156">II/156 : IRAS Faint Source Catalog, |b| &gt; 10, Version 2.0 (Moshir+ 1989)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJS/182/628">J/ApJS/182/628 : Spitzer quasar and ULIRG evolution study (Veilleux+, 2009)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/MNRAS/375/115">J/MNRAS/375/115 : ULIRGs galaxies in SDSS, 2dF and 6dF (Hwang+, 2007)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/AJ/131/1942">J/AJ/131/1942 : 2MASS observations of IRAS 1Jy ULIRGs (Chen+, 2006)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/A+A/409/115">J/A+A/409/115 : VLA imaging of IRAS 1 Jy ULIRG sample (Nagar+, 2003)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJS/143/315">J/ApJS/143/315 : IRAS 1Jy sample of ultraluminous galaxies. 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