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<ri:Resource created="2013-08-02T14:26:27Z" 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>Combined sample of radio-loud AGNs at 408MHz</title><shortName>J/ApJ/744/84</shortName><identifier>ivo://CDS.VizieR/J/ApJ/744/84</identifier><altIdentifier>doi:10.26093/cds/vizier.17440084</altIdentifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Yuan Z.</name></creator><creator><name>Wang J.</name></creator><date role="Updated">2017-12-22T05:32:36Z</date><date role="Created">2013-08-02T14:26:27Z</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>radio-continuum-emission</subject><subject>redshifted</subject><description>The work in this paper aims at determining the evolution and possible co-evolution of radio-loud active galactic nuclei (AGNs) and their cores via their radio luminosity functions (i.e., total and core RLFs, respectively). Using a large combined sample of 1063 radio-loud AGNs selected at low radio frequency, we investigate the RLF (radio luminosity function) at 408MHz of steep-spectrum radio sources. Our results support a luminosity-dependent evolution. Using core flux density data of the complete sample 3CRR (Laing et al., 1983, Cat. J/MNRAS/204/151; see also Cat. VIII/1), we investigate the core RLF at 5.0GHz. Based on the combined sample with incomplete core flux data, we also estimate the core RLF using a modified factor of completeness. Both results are consistent and show that the comoving number density of radio cores displays a persistent decline with redshift, implying a negative density evolution. We find that the core RLF is obviously different from the total RLF at the 408 MHz band which is mainly contributed by extended lobes, implying that the cores and extended lobes could not be co-evolving at radio emission.</description><source format="bibcode">2012ApJ...744...84Y</source><referenceURL>https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/744/84</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/34">VIII/34 : Parkes Half-Jansky Flat-Spectrum Sample (Drinkwater + 1997)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/VIII/16">VIII/16 : Molonglo Reference Catalog of Radio Sources (Large+ 1991)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/VIII/13">VIII/13 : A new catalog of 53522 4.85GHz sources (Becker+ 1991)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/VIII/15">VIII/15 : Parkes Radio Sources Catalogue (PKSCAT90) (Wright+ 1990)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/VIII/37">VIII/37 : The Third Bologna Survey (B3) (Ficarra+ 1985)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/VIII/5">VIII/5 : Bright Extragalactic Radio Sources (1Jy) (Kuehr+, 1981)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/VIII/36">VIII/36 : The Second Bologna Survey (Colla+ 1970-1974)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/VIII/1">VIII/1 : The 3C and 3CR Catalogues (Edge+ 1959-1962)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJS/175/314">J/ApJS/175/314 : VSOP 5GHz AGN survey V. 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