J/MNRAS/495/1853ivo://CDS.VizieR/J/MNRAS/495/1853doi:10.26093/cds/vizier.74951853CDSPouliasis E.Mountrichas G.Georgantopoulos I.Ruiz A.Yang M.,Bonanos A.Z.2024-08-21T20:14:30Z2020-06-01T08:33:33ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.fractive-galactic-nucleigalaxiesinfrared-sourcesx-ray-sourcesredshiftedThe detection of X-ray emission constitutes a reliable and efficient tool for the selection of active galactic nuclei (AGNs), although it may be biased against the most heavily absorbed AGNs. Simple mid-infrared (IR) broad-band selection criteria identify a large number of luminous and absorbed AGNs, yet again host contamination could lead to non-uniform and incomplete samples. Spectral energy distribution (SED) decomposition is able to decouple the emission from the AGN versus that from star-forming regions, revealing weaker AGN components. We aim to identify the obscured AGN population in the VIMOS Public Extragalactic Redshift Survey in the Canada-France-Hawaii Telescope Legacy Survey W1 field through SED modelling. We construct SEDs for 6860 sources and identify 160 AGNs at a high confidence level using a Bayesian approach. Using optical spectroscopy, we confirm the nature of ~85 per cent of the AGNs. Our AGN sample is highly complete (~92 per cent) compared to mid-IR colour-selected AGNs, including a significant number of galaxy-dominated systems with lower luminosities. In addition to the lack of X-ray emission (80 per cent), the SED fitting results suggest that the majority of the sources are obscured. We use a number of diagnostic criteria in the optical, IR, and X-ray regimes to verify these results. Interestingly, only 35 per cent of the most luminous mid-IR-selected AGNs have X-ray counterparts suggesting strong absorption. Our work emphasizes the importance of using SED decomposition techniques to select a population of type II AGNs, which may remain undetected by either X-ray or IR colour surveys.2020MNRAS.495.1853Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/495/1853CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/317 : The CFHTLS Survey (T0007 release) (Hudelot+ 2012)II/352 : The VISTA Hemisphere Survey (VHS) catalog (McMahon+, 2013)II/328 : AllWISE Data Release (Cutri+ 2013)J/A+A/562/A23 : VIMOS Public Extragalactic Survey (VIPERS) DR1 (Garilli+ 2014)J/ApJ/642/673 : IR-selected obscured AGN candidates (Polletta+, 2006)J/ApJ/702/441 : Obscured active galaxies (Greene+, 2009)J/ApJ/740/37 : Obscured AGN at z~0.5-1 in the CDFS (Luo+, 2011)J/A+A/556/A114 : Obscured AGNs in XMM deep survey in CDF-SJ/ApJ/814/11 : Obscured AGNs from XMM-Newton and AKARI (Terashima+, 2015)J/A+A/618/A66 : Redshifts of obscured AGN (Simmonds+, 2018)J/A+A/626/A9 : Obscured AGN at 1.5<z<3.0 (Mignoli+, 2019)J/A+A/636/A37 : High-z AGN obscured by host galaxy ISM (D'Amato+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/495/1853https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/495/1853http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/495/1853https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/495/1853https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/495/1853http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/495/1853GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/495/1853/tableb1 (Catalogue of the 160 SED-selected AGNs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/495/1853/tableb1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/495/1853/tableb1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/495/1853/tableb1?GETtext/xml+votable180.050000true30.44515-5.94690.0055555555555555565/4421-4422 4425 6/17677-17679 17681-17683 17692 17697-17699 17705 17708 17712 36798https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/495/1853?format=asciiX-rayInfrareddefaultJ/MNRAS/495/1853/tableb1Catalogue of the 160 SED-selected AGNsSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVIPERSVIPERS identifiermeta.id;meta.mainlongRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainzRedshiftsrc.redshiftfloatLIRLuminosity in the infrared1e-07Wphys.luminosity;em.IRfloatl_LXUpper limit flag on LXmeta.code.errorcharLXLuminosity in the X-ray (2-10keV) band1e-07Wphys.luminosity;em.X-rayfloatmid-IR[0/1] 1 (0) if AGN is (is not) selected via through mid-IR coloursmeta.codeintBroad-lines[0/1] 1 (0) for existence (absence) of broad linesmeta.codeint[NeV]-em[0/1] 1 (0) if AGN is (is not) selected via [NeV] emissionmeta.codeintMEx[0/1] 1 (0) if AGN is (is not) selected via MEx diagrammeta.codeintTBT[0/1] 1 (0) if AGN is (is not) selected via TBT diagrammeta.codeintSED-typeAGN type derived from the SED fitting results ({psi} value)src.classfloatr-W2r-W2 colour indexmagphot.color;em.IR;em.IRfloat