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<ri:Resource created="2014-11-26T07:47:15Z" 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>SDSS-DR7 optical spectra analysis of radio galaxies</title><shortName>J/ApJ/765/62</shortName><identifier>ivo://CDS.VizieR/J/ApJ/765/62</identifier><altIdentifier>doi:10.26093/cds/vizier.17650062</altIdentifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Sikora M.</name></creator><creator><name>Stasinska G.</name></creator><creator><name>Koziel-Wierzbowska D.</name></creator><creator><name>Madejski G.M.</name></creator><creator><name>Asari N.V.</name></creator><date role="Updated">2017-12-07T07:27:36Z</date><date role="Created">2014-11-26T07:47:15Z</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>radio-galaxies</subject><subject>redshifted</subject><subject>spectroscopy</subject><subject>astronomical-object-identification</subject><description>We study a large sample of narrow-line radio galaxies (NLRGs) with extended radio structures. Using 1.4GHz radio luminosities L_1.4_, narrow optical emission line luminosities L_[OIII]_ and L_Halpha_, as well as black hole masses M_BH_ derived from stellar velocity dispersions measured from the optical spectra obtained with the Sloan Digital Sky Survey, we find that (1) NLRGs cover about four decades of the Eddington ratio, {lambda}{equiv}L_bol_/L_Edd_{prop.to}L_line_/M_BH_; (2) L_1.4_/M_BH_ strongly correlates with {lambda}; and (3) radio loudness, R=L_1.4_/L_Line_, strongly anti-correlates with {lambda}. A very broad range of the Eddington ratio indicates that the parent population of NLRGs includes both radio-loud quasars (RLQs) and broad-line radio galaxies (BLRGs). The correlations they obey and their high jet production efficiencies favor a jet production model which involves the so-called magnetically choked accretion scenario. In this model, production of the jet is dominated by the Blandford-Znajek mechanism, and the magnetic fields in the vicinity of the central black hole are confined by the ram pressure of the accretion flow. Since large net magnetic flux accumulated in central regions of the accretion flow required by the model can take place only via geometrically thick accretion, we speculate that the massive, "cold" accretion events associated with luminous emission-line active galactic nucleus can be accompanied by an efficient jet production only if preceded by a hot, very sub-Eddington accretion phase.</description><source format="bibcode">2013ApJ...765...62S</source><referenceURL>https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/765/62</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/VIII/90">VIII/90 : The FIRST Survey Catalog, Version 12Feb16 (Becker+ 2012)</relatedResource><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/VIII/84">VIII/84 : A final non-redundant catalogue for 7C 151-MHz survey (Hales+ 2007)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/VIII/65">VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/VIII/31">VIII/31 : Revised source list for the Rees 38-MHz survey (Hales+ 1995)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/VIII/25">VIII/25 : 6C Survey of radio sources - VI. 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(Pearson, 1978)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/MNRAS/171/475">J/MNRAS/171/475 : The 5C5 survey of radio sources. 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