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<ri:Resource created="2019-06-19T15:02:42Z" 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>BH masses and Eddington ratios of Type 2 QSOs</title><shortName>J/ApJ/859/116</shortName><identifier>ivo://CDS.VizieR/J/ApJ/859/116</identifier><altIdentifier>doi:10.26093/cds/vizier.18590116</altIdentifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Kong M.</name></creator><creator><name>Ho L.C.</name></creator><date role="Updated">2019-07-24T11:23:17Z</date><date role="Created">2019-06-19T15:02:42Z</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>visible-astronomy</subject><subject>spectroscopy</subject><subject>redshifted</subject><subject>galaxy-kinematics</subject><subject>active-galactic-nuclei</subject><subject>line-intensities</subject><description>Type 2 quasars are an important constituent of active galaxies, possibly representing the evolutionary precursors of traditionally studied type 1 quasars. We characterize the black hole (BH) mass (MBH) and Eddington ratio (Lbol/LEdd) for 669 type 2 quasars selected from the Sloan Digital Sky Survey, using BH masses estimated from the MBH-{sigma}* relation and bolometric corrections scaled from the extinction-corrected [OIII]{lambda}5007 luminosity. When stellar velocity dispersions cannot be measured directly from the spectra, we estimate them from the core velocity dispersions of the narrow emission lines [OII]{lambda}{lambda}3726,3729, [SII]{lambda}{lambda}6716,6731, and [OIII]{lambda}5007, which are shown to trace the gravitational potential of the stars. Energy input from the active nucleus still imparts significant perturbations to the gas kinematics, especially to high-velocity, blueshifted wings. Nonvirial motions in the gas become most noticeable in systems with high Eddington ratios. The BH masses of our sample of type 2 quasars range from MBH~10^6.5^ to 10^10.4^M_{sun}_ (median 10^8.2^M_{sun}_). Type 2 quasars have characteristically large Eddington ratios (Lbol/LEdd~10^-2.9^-10^1.8^; median 10^-0.7^), slightly higher than in type 1 quasars of similar redshift; the luminosities of ~20% of the sample formally exceed the Eddington limit. The high Eddington ratios may be consistent with the notion that obscured quasars evolve into unobscured quasars.</description><source format="bibcode">2018ApJ...859..116K</source><referenceURL>https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/859/116</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/J/ApJS/112/315">J/ApJS/112/315 : Spectroscopic parameters of Seyfert nuclei (Ho+ 1997)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/AJ/126/2125">J/AJ/126/2125 : SDSS candidate type II quasars (Zakamska+, 2003)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJS/152/251">J/ApJS/152/251 : Indo-US library of coude feed stellar sp. 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