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<ri:Resource created="2015-02-19T16:18:47Z" 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>15GHz variability of {gamma}-ray blazars</title><shortName>J/MNRAS/438/3058</shortName><identifier>ivo://CDS.VizieR/J/MNRAS/438/3058</identifier><altIdentifier>doi:10.26093/cds/vizier.74383058</altIdentifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Richards J.L.</name></creator><creator><name>Hovatta T.</name></creator><creator><name>Max-Moerbeck W.</name></creator><creator><name>Pavlidou V.</name></creator><creator><name>Pearson T.J.,Readhead A.C.S.</name></creator><date role="Updated">2024-08-08T20:12:26Z</date><date role="Created">2015-02-19T16:18:47Z</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>bl-lacertae-objects</subject><subject>quasars</subject><subject>gamma-ray-astronomy</subject><subject>radio-sources</subject><description>We present results from four years of twice-weekly 15GHz radio monitoring of about 1500 blazars with the Owens Valley Radio Observatory 40m telescope. Using the intrinsic modulation index to measure variability amplitude, we find that, with &gt;6{sigma} significance, the radio variability of radio-selected {gamma}-ray-loud blazars is stronger than that of {gamma}-ray-quiet blazars. Our extended data set also includes at least 21 months of data for all AGN with 'clean' associations in the Fermi Large Area Telescope First AGN Catalog, 1LAC. With these additional data, we examine the radio variability properties of a {gamma}-ray-selected blazar sample. Within this sample, we find no evidence for a connection between radio variability amplitude and optical classification. In contrast, for our radio-selected sample we find that the BL Lac object subpopulation is more variable than the flat-spectrum radio quasar (FSRQ) subpopulation. Radio variability is found to correlate with the synchrotron peak frequency, with low- and intermediate-synchrotron-peaked blazars varying more than high-synchrotron-peaked ones. We find evidence for a significant negative correlation between redshift and radio variability among bright FSRQs.</description><source format="bibcode">2014MNRAS.438.3058R</source><referenceURL>https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/438/3058</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/J/ApJS/175/97">J/ApJS/175/97 : CGRaBS: survey of gamma-ray blazar candidates (Healey+ 2008)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJ/715/429">J/ApJ/715/429 : First Fermi-LAT AGN catalog (1LAC) (Abdo+, 2010)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJ/743/171">J/ApJ/743/171 : The 2LAC catalog (Ackermann+, 2011)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJS/194/29">J/ApJS/194/29 : Observations of blazars at 15GHz (Richards+, 2011)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/MNRAS/439/690">J/MNRAS/439/690 : Optical/{gamma}-ray variability in blazars (Hovatta+, 2014)</relatedResource></relationship></content><rights>https://cds.unistra.fr/vizier-org/licences_vizier.html</rights><capability><interface xsi:type="vr:WebBrowser"><accessURL use="full">https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/438/3058</accessURL><mirrorURL title="VizieR at IUCAA: Pune, India">https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/438/3058</mirrorURL><mirrorURL title="VizieR at SAAO: SAAO, South Africa">http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/438/3058</mirrorURL></interface></capability><capability><interface xsi:type="vs:ParamHTTP"><accessURL 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