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<ri:Resource created="2012-08-29T11:40:12Z" 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>Mid-IR emission lines in AGNs</title><shortName>J/ApJ/725/2270</shortName><identifier>ivo://CDS.VizieR/J/ApJ/725/2270</identifier><altIdentifier>doi:10.26093/cds/vizier.17252270</altIdentifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Pereira-Santaella M.</name></creator><creator><name>Diamond-Stanic A.M.</name></creator><creator><name>Alonso-Herrero A.</name></creator><creator><name>Rieke G.H.</name></creator><date role="Updated">2017-10-03T05:12:35Z</date><date role="Created">2012-08-29T11:40:12Z</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>galaxies</subject><subject>infrared-sources</subject><subject>spectroscopy</subject><subject>infrared-astronomy</subject><description>We used Spitzer/Infrared Spectrograph spectroscopic data on 426 galaxies including quasars, Seyferts, LINERs, and HII galaxies to investigate the relationship among the mid-IR emission lines. There is a tight linear correlation between the [NeV]14.3um and 24.3um (97.1eV) and the [OIV]25.9um (54.9eV) high-ionization emission lines. The correlation also holds for these high-ionization emission lines and the [NeIII]15.56um (41eV) emission line, although only for active galaxies. We used these correlations to calculate the [NeIII] excess due to star formation in Seyfert galaxies. We also estimated the [OIV] luminosity due to star formation in active galaxies and determined that it dominates the [OIV] emission only if the contribution of the active nucleus to the total luminosity is below 5%. We find that the active galactic nucleus dominates the [OIV] emission in most Seyfert galaxies, whereas star formation adequately explains the observed [OIV] emission in optically classified HII galaxies. Finally, we computed photoionization models to determine the physical conditions of the narrow-line region where these high-ionization lines originate. The estimated ionization parameter range is -2.8&lt;logU&lt;-2.5 and the total hydrogen column density range is 20&lt;logn_H_(cm^-2^)&lt;21.</description><source format="bibcode">2010ApJ...725.2270P</source><referenceURL>https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/725/2270</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/VII/157">VII/157 : The Extended 12um galaxy sample (Rush+ 1993)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/MNRAS/414/500">J/MNRAS/414/500 : Spitzer/IRS ATLAS project source (Hernan-Caballero+, 2011)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJ/719/1191">J/ApJ/719/1191 : Mid-IR indicators of SF and AGN in galaxies (Treyer+, 2010)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJ/723/895">J/ApJ/723/895 : IR luminosities and aromatic features of 5MUSES (Wu+, 2010)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJ/709/1257">J/ApJ/709/1257 : Spitzer-IRS spectra of Seyfert galaxies (Tommasin+, 2010)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJ/693/1821">J/ApJ/693/1821 : The Spitzer infrared nearby galaxies survey (Dale+, 2009)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJS/182/628">J/ApJS/182/628 : Spitzer quasar and ULIRG evolution study (Veilleux+, 2009)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/MNRAS/398/1165">J/MNRAS/398/1165 : AGN in nearby galaxies (Goulding+, 2009)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJS/184/230">J/ApJS/184/230 : Spitzer high-resolution MIR spectral atlas (Bernard-Salas+,</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJ/701/1123">J/ApJ/701/1123 : MIR spectroscopic catalog of 150 galaxies (Dasyra+, 2009)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJ/705/14">J/ApJ/705/14 : Seyfert galaxies in the mid-IR (Deo+, 2009)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJ/658/778">J/ApJ/658/778 : Spitzer mid-IR spectroscopy of z~2 ULIRGs (Yan+, 2007)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJS/112/315">J/ApJS/112/315 : Spectroscopic parameters of Seyfert nuclei (Ho+ 1997)</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/725/2270</accessURL><mirrorURL title="VizieR at IUCAA: Pune, India">https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/725/2270</mirrorURL><mirrorURL 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