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<ri:Resource created="2022-12-14T09:37:47Z" 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>4FGL blazars with Gaia DR2 data</title><shortName>J/ApJ/913/120</shortName><identifier>ivo://CDS.VizieR/J/ApJ/913/120</identifier><altIdentifier>doi:10.26093/cds/vizier.19130120</altIdentifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Zeng H.</name></creator><creator><name>Petrosian V.</name></creator><creator><name>Yi T.</name></creator><date role="Updated">2023-01-17T13:20:59Z</date><date role="Created">2022-12-14T09:37:47Z</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>active-galactic-nuclei</subject><subject>gamma-ray-astronomy</subject><subject>photometry</subject><subject>visible-astronomy</subject><subject>redshifted</subject><description>Multiwavelength analyses of spectra of active galactic nuclei provide useful information on the physical processes in the accretion disk and jets of black holes. This, however, is limited to bright sources and may not represent the population as a whole. Another approach is through the investigation of the cosmological evolution of the luminosity function (LF), which shows varied evolution (luminosity and density) at different wavelengths. These differences and the correlations between luminosities can shed light on the jet-accretion disk connection. Most such studies use forward fitting parametric methods that involve several functions and many parameters. We use nonparametric, nonbinning methods developed by Efron &amp; Petrosian (1992ApJ...399..345E) and Lynden-Bell (1971MNRAS.155...95L), for obtaining unbiased description of the evolution of the LF, from data truncated by observational selection effects. We present an analysis of the evolution of gamma-ray LF of blazars with a main focus on flat-spectrum radio quasars. This requires analysis of both gamma-ray and optical data, essential for redshift measurements, and a description of the joint LF. We use a new approach that divides the sample into two subsamples, each with its own flux limit. We use the Fermi Large Area Telescope and GAIA observations, and present results on the gamma-ray LF and its evolution, and determine the intrinsic correlation between the gamma-ray and optical luminosities corrected for the well-known false correlation induced by their similar redshift dependence and evolution of the two luminosities. We also present a direct estimation of the contribution of blazars to the spectrum of the extragalactic gamma-ray background.</description><source format="bibcode">2021ApJ...913..120Z</source><referenceURL>https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/913/120</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/I/345">I/345 : Gaia DR2 (Gaia Collaboration, 2018)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/AJ/129/2542">J/AJ/129/2542 : BL Lac from SDSS (Collinge+, 2005)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/AJ/139/390">J/AJ/139/390 : Opt. selected BL Lac objects from SDSS-DR7 (Plotkin+, 2010)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJS/188/405">J/ApJS/188/405 : Fermi-LAT first source catalog (1FGL) (Abdo+, 2010)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJ/780/73">J/ApJ/780/73 : Redshifts of BL Lac objects from Fermi (Ajello+, 2014)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJ/799/86">J/ApJ/799/86 : Isotropic gamma-ray emission 0.1-820GeV (Ackermann+, 2015)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/MNRAS/464/1306">J/MNRAS/464/1306 : LARGESS survey (Ching+, 2017)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJ/850/161">J/ApJ/850/161 : Konus-Wind cat. of GRBs with redshifts. 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(Tsvetkova+, 2017)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJS/247/33">J/ApJS/247/33 : The Fermi LAT fourth source catalog (4FGL) (Abdollahi+, 2020)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJ/892/105">J/ApJ/892/105 : 4th catalog of Fermi LAT-detected AGNs (4LAC) (Ajello+, 2020)</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/ApJ/913/120</accessURL><mirrorURL title="VizieR at IUCAA: Pune, India">https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/913/120</mirrorURL><mirrorURL title="VizieR at SAAO: SAAO, South Africa">http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/913/120</mirrorURL></interface></capability><capability><interface xsi:type="vs:ParamHTTP"><accessURL 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