J/ApJ/894/24ivo://CDS.VizieR/J/ApJ/894/24doi:10.26093/cds/vizier.18940024CDSKimura Y.Yamada T.Kokubo M.Yasuda N.Morokuma T.Nagao T.,Matsuoka Y.2021-12-03T12:44:13Z2021-10-19T13:05:24ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiinfrared-photometryvisible-astronomybroad-band-photometryredshiftedsurveysWe study variability of active galactic nuclei (AGNs) by using the deep optical multiband photometry data obtained from the Hyper Suprime-Cam Subaru Strategic Program (HSC SSP) survey in the COSMOS field. The images analyzed here were taken with 8, 10, 13, and 15 epochs over three years in the g, r, i, and z bands, respectively. We identified 491 robust variable AGN candidates, down to i=25mag and with redshift up to 4.26. Ninety percent of the variability-selected AGNs are individually identified with the X-ray sources detected in the Chandra COSMOS Legacy survey. We investigate their properties in variability by using structure function analysis and find that the structure function for low-luminosity AGNs (L_bol_<~10^45^erg/s) shows a positive correlation with luminosity, which is the opposite trend for the luminous quasars. This trend is likely to be caused by a larger contribution of the host galaxy light for lower-luminosity AGNs. Using the model templates of galaxy spectra, we evaluate the amount of host galaxy contribution to the structure function analysis and find that dominance of the young stellar population is needed to explain the observed luminosity dependence. This suggests that low-luminosity AGNs at 0.8<~z<~1.8 are predominantly hosted in star-forming galaxies. The X-ray stacking analysis reveals the significant emission from the individually X-ray undetected AGNs in our variability-selected sample. The stacked samples show very large hardness ratios in their stacked X-ray spectrum, which suggests that these optically variable sources have large soft X-ray absorption by dust-free gas.2020ApJ...894...24Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/894/24CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/76 : Leiden/Argentine/Bonn (LAB) Survey of Galactic HI (Kalberla+ 2005)J/ApJS/154/519 : Properties of ultraluminous X-ray candidates (Swartz+, 2004)J/A+A/451/457 : X-ray properties of AGN in CDFS (Tozzi+, 2006)J/ApJ/665/990 : SDSS DR2 BAL QSOs (Ganguly+, 2007)J/AJ/133/186 : Opt. spectroscopy of 77 luminous AGNs and QSOs (Lacy+, 2007)J/ApJ/663/81 : SED of hard X-ray selected AGN in XMDS (Polletta+, 2007)J/A+A/467/73 : 3{sigma} hard sample of XMDS survey (Tajer+, 2007)J/ApJ/698/895 : Variations in QSOs optical flux (Kelly+, 2009)J/ApJS/184/218 : The zCOSMOS 10k-bright spectroscopic sample (Lilly+, 2009)J/ApJ/742/61 : Phot. redshift of AGNs from XMM- & C-COSMOS (Salvato+ 2011)J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)J/MNRAS/416/1844 : 2XMM ultraluminous X-ray source candidates (Walton+, 2011)J/A+A/559/A14 : VIMOS VLT Deep Survey final data release (Le Fevre+, 2013)J/ApJ/805/122 : X-ray properties of PHL1811 analogs and WLQs (Luo+, 2015)J/ApJS/220/12 : FMOS-COSMOS survey III. 0.7<z<2.5 gal. (Silverman+, 2015)J/A+A/584/A106 : Catalogues of variable AGNs (Simm+, 2015)J/ApJ/819/62 : The COSMOS-Legacy Survey (CLS) catalog (Civano+, 2016)J/ApJS/224/24 : The COSMOS2015 catalog (Laigle+, 2016)J/ApJ/825/7 : Evolution of ~6Ms CDF-S galaxies (Lehmer+, 2016)J/ApJ/817/34 : C-COSMOS Legacy multiwavelength catalog (Marchesi+, 2016)J/ApJS/225/27 : 3D-HST Survey: grism spectra master cat. (Momcheva+, 2016)J/ApJS/228/9 : Physical param. of ~300000 SDSS-DR12 QSOs (Kozlowski, 2017)J/ApJS/233/17 : Swift/BAT AGN spectroscopic survey. V. X-ray (Ricci+, 2017)J/ApJ/858/77 : DEIMOS 10K sp. survey in COSMOS field (Hasinger+, 2018)J/A+A/627/A33 : Optically variable AGN in COSMOS field (De Cicco+, 2019)J/ApJ/870/31 : BAT AGN spectroscopic survey. XI. IR phot. (Ichikawa+, 2019)http://hsc-release.mtk.nao.ac.jp/doc/index.php/database/ : HSC SSP databasehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/894/24https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/894/24http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/894/24https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/894/24https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/894/24http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/894/24GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/894/24/table4 (Catalog of the variable AGNs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/894/24/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/894/24/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/894/24/table4?GETtext/xml+votable180.050000true150.743862.202450.0055555555555555565/6814 6/27245 27247https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/894/24?format=asciiOpticalInfrareddefaultJ/ApJ/894/24/table4Catalog of the variable AGNsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/491] Identification number of variable AGNmeta.idintRAJ2000[149.5/150.9] Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[1.6/2.8] Declination (J2000)degpos.eq.dec;meta.mainimag[17.56/25.87] i band cmodel AB magnitudemagphot.mag;em.opt.IfloatXfl[0/1] X ray detection flag (1=detected)meta.codeintgfl[0/1] g band 'variability' flag (1=variable)meta.codeintrfl[0/1] r band 'variability' flag (1=variable)meta.codeintifl[0/1] i band 'variability' flag (1=variable)meta.codeintzfl[0/1] z band 'variability' flag (1=variable)meta.codeintNcorr[1/6] Number of 'correlation'-flagged band-pairsstat.correlationintz[0.04/4.26] Spectroscopic or photometric redshiftsrc.redshiftfloatr_z[1/4] Redshift reference (1)meta.ref;pos.frameintCOSMOS2015[263032/979571] Identification number listed in COSMOS2015 (Laigle+, 2016, J/ApJS/224/24)meta.id;meta.mainintSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.ref.urlchar