J/PASJ/70/S36ivo://CDS.VizieR/J/PASJ/70/S36doi:10.26093/cds/vizier/bj-26/3dgCDSTerashima Y.Suganuma M.Akiyama M.Greene J.E.Kawaguchi T.,Iwasawa K.Nagao T.Noda H.Toba Y.Ueda Y.Yamashita T.2026-03-17T20:05:44Z2019-03-15T10:33:59ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiquasarsx-ray-sourcesmillimeter-astronomysubmillimeter-astronomyWe construct a sample of X-ray-bright optically faint active galactic nuclei by combining Subaru Hyper Suprime-Cam, XMM-Newton, and infrared source catalogs. Fifty-three X-ray sources satisfying i-band magnitude fainter than 23.5mag and X-ray counts with the EPIC-PN detector larger than 70 are selected from 9.1 deg^2^, and their spectral energy distributions (SEDs) and X-ray spectra are analyzed. Forty-four objects with an X-ray to i-band flux ratio FX/Fi>10 are classified as extreme X-ray-to-optical flux sources. Spectral energy distributions of 48 among 53 are represented by templates of type 2 AGNs or star-forming galaxies and show the optical signature of stellar emission from host galaxies in the source rest frame. Infrared/optical SEDs indicate a significant contribution of emission from dust to the infrared fluxes, and that the central AGN is dust obscured. The photometric redshifts determined from the SEDs are in the range of 0.6-2.5. The X-ray spectra are fitted by an absorbed power-law model, and the intrinsic absorption column densities are modest (best-fit logNH=20.5-23.5cm^-2^ in most cases). The absorption-corrected X-ray luminosities are in the range of 6x10^42^-2x10^45^erg/s. Twenty objects are classified as type 2 quasars based on X-ray luminosity and NH. The optical faintness is explained by a combination of redshifts (mostly z>1.0), strong dust extinction, and in part a large ratio of dust/gas.2018PASJ...70S..36Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/PASJ/70/S36CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/49 : XXL Survey: First results (Pierre+, 2016)IX/50 : XMM-Newton Serendipitous Source Catalogue 3XMM-DR6 (XMM-SSC, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/PASJ/70/S36https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/PASJ/70/S36http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/PASJ/70/S36https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/PASJ/70/S36https://vizier.iucaa.in/viz-bin/votable?-source=J/PASJ/70/S36http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/PASJ/70/S36GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/PASJ/70/S36/table2 (Results of SED fits)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/PASJ/70/S36/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/PASJ/70/S36/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/PASJ/70/S36/table2?GETtext/xml+votable180.050000true33.75998-3.68660.0055555555555555565/4422 6/17679 17683 17686 17692 17694 17712-17713https://cdsarc.cds.unistra.fr/viz-bin/moc/J/PASJ/70/S36?format=asciiX-rayMillimeterdefaultJ/PASJ/70/S36/table2Results of SED fitszphPhotometric redshiftsrc.redshiftfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint3XMM3XMM name (JHHMMSS.s+DDMMSS)meta.id;meta.maincharAVExtinction in V bandmagphys.absorption;em.opt.VfloatSEDAdopted SED template (1)meta.id;stat.fitcharClass1Classification of SED type (AGN1, AGN2 or SF)meta.notecharzsp? Spectroscopic redshift presented in Akiyama et al. (2015PASJ...67...82A)src.redshiftfloatnullableClass2Spectroscopic classification in Akiyama et al. (2015PASJ...67...82A) (2)src.classcharNote[a,bc ] Note (3)meta.notechar3XMMDR6Display the 3XMM-DR6 (Cat. IX/50) datameta.ref.urlchar_RAPositions from 3XMM, DR6 (right ascension part)degpos.eq.ra;meta.main_DEPositions from 3XMM, DR6 (declination part)degpos.eq.dec;meta.mainJ/PASJ/70/S36/table4Results of power-law fits to X-ray spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint3XMM3XMM name (JHHMMSS.s+DDMMSS)meta.id;meta.maincharObsIDObservation IDmeta.id;obsNetCtNet counts in the 0.5-10keV band (counts from all the available sensors are summed)ctphot.count;em.X-ray.medium;src.netintNHGalactic absorption column density1e+20cm**-2physfloatGAMMAPhoton indexspect.indexfloatE_GAMMAError on Photon index (upper value)stat.error;stat.maxfloate_GAMMAError on Photon index (lower value)stat.errorfloatFluxObserved flux in the 2-10keV band in units of 10^-14^erg/cm^2^/s1e-17W.m**-2phot.flux;em.X-ray.medium;arith.ratiofloatCC statisticstat.fit.paramfloatDOFDegrees of freedomstat.fit.dofintNote[a-f] Notes (1)meta.notecharJ/PASJ/70/S36/table5Results of absorbed power law fits to X-ray spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint3XMM3XMM name (JHHMMSS.s+DDMMSS) (1)meta.id;meta.maincharNHIntrinsic absorption column density at source redshift (2)1e+22cm**-2phys.columnDensityfloatE_NHError on NH (upper value)1e+22cm**-2stat.error;stat.maxfloate_NHError on NH (lower value)1e+22cm**-2stat.errorfloatL2-10X-ray luminosity in 2-10keV corrected for the Galactic and intrinsic absorption (3)1e+37Wphys.luminosity;em.X-rayfloatCC statisticstat.fit.paramfloatDOFDegrees of freedomstat.fit.dofintJ/PASJ/70/S36/table6Flux ratiosrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint3XMM3XMM name (JHHMMSS.s+DDMMSS)meta.id;meta.maincharimagCmodel magnitude in the i band, Galactic extinction is not correctedmagphot.mag;em.opt.IfloatFX/FiX-ray to i-band flux ratio (1)phot.flux;arith.ratiofloatFX/F24? X-ray to 24um flux ratio (2)phot.flux;arith.ratiofloatnullablei-[3.6]Subaru-IRAC i-[3.6] colour indexmagphot.color;em.opt;em.IRfloat[3.6]-[4.5]IRAC [3.6]-[4.5] colour indexmagphot.color;em.IR;em.IRfloati-[24]? Subaru-IRAC i-[24] colour indexmagphot.color;em.opt;em.IRfloatnullable