J/ApJ/740/37ivo://CDS.VizieR/J/ApJ/740/37doi:10.26093/cds/vizier.17400037CDSLuo B.Brandt W.N.Xue Y.Q.Alexander D.M.Brusa M.Bauer F.E.,Comastri A.Fabian A.C.Gilli R.Lehmer B.D.Rafferty D.A.,Schneider D.P.Vignali C.2013-07-22T07:09:19Z2013-03-01T13:05:02ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiinfrared-sourcesredshiftedextinctionWe identify a numerically significant population of heavily obscured AGNs at z~0.5-1 in the Chandra Deep Field-South (CDF-S) and Extended Chandra Deep Field-South by selecting 242 X-ray undetected objects with infrared-based star-formation rates (SFRs) substantially higher (a factor of 3.2 or more) than their SFRs determined from the UV after correcting for dust extinction. An X-ray stacking analysis of 23 candidates in the central CDF-S region using the 4Ms Chandra data reveals a hard X-ray signal with an effective power-law photon index of {Gamma}=0.6^+0.3^_-0.4_, indicating a significant contribution from obscured AGNs. Based on Monte Carlo simulations, we conclude that 74%+/-25% of the selected galaxies host obscured AGNs, within which ~95% are heavily obscured and ~80% are Compton-thick (CT; N_H_>1.5x10^24^cm^-2^).2011ApJ...740...37Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/740/37CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-2012)II/253 : Chandra Deep Field South: multi-colour data (Wolf+, 2008)J/ApJS/195/10 : The CDF-S survey: 4Ms source catalogs (Xue+, 2011)J/ApJ/727/1 : IRAC/MUSYC SIMPLE survey (Damen+, 2011)J/ApJS/191/124 : Spectroscopy of ECDF-S X-ray sources (Silverman+, 2010)J/ApJS/189/270 : MUSYC optical imaging in ECDF-S (Cardamone+, 2010)J/ApJS/187/560 : Photometric redshifts of the 2Ms CDF-S (Luo+, 2010)J/A+A/512/A12 : VLT/VIMOS spectroscopy in GOODS-South field (Balestra+, 2010)J/ApJ/702/441 : Obscured active galaxies (Greene+, 2009)J/A+A/507/1277 : Multiwavelength photometry of CDFS X-ray sources (Brusa+,J/ApJS/179/19 : CDFS survey: 2 Ms source catalogs (Luo+, 2008)J/A+A/478/83 : GOODS-South Field VLT/FORS2 redshifts. III. (Vanzella+, 2008)J/A+A/465/1099 : Redshift catalog of 691 objects in CDFS (Ravikumar+, 2007)J/ApJ/642/673 : IR-selected obscured AGN candidates (Polletta+, 2006)J/ApJ/642/L13 : ECDFS MUSYC galaxies UBVRIzNB5000 photometry (Gawiser+, 2006)J/A+A/449/951 : GOODS-MUSIC sample: multicolour catalog (Grazian+, 2006)J/ApJS/161/21 : Extended Chandra Deep Field-South survey (Lehmer+, 2005)J/A+A/437/883 : K20 survey: spectroscopic catalogue (Mignoli+, 2005)J/A+A/428/1043 : Redshifts from VIMOS VLT Deep Survey (Le Fevre+, 2004)J/ApJS/155/271 : CDF-S: Optical spectroscopy (Szokoly+, 2004)J/ApJS/139/369 : Chandra Deep Field South. 1 Ms catalog (Giacconi+, 2002)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/740/37https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/740/37http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/740/37https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/740/37https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/740/37http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/740/37GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/740/37/table1 (List of ISX (IR SFR excess) and ISN (IR SFR normal) sources in the X-ray stacking analysis)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/740/37/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/740/37/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/740/37/table1?GETtext/xml+votable180.050000true53.2067083-27.81669440.0055555555555555566/359356.772611666688002e-21 1.000830682546041e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/740/37?format=asciiOpticalInfrareddefaultJ/ApJ/740/37/table1List of ISX (IR SFR excess) and ISN (IR SFR normal) sources in the X-ray stacking analysisrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSampleSample (ISN or ISX) (1)src.samplecharRAJ2000[3] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[27] Degree of Declination (J2000)pos.eq.dec;meta.mainz[0.5/1] Redshift (2)src.redshiftfloatb_z? The 1{sigma} lower limit on z (3)src.redshift;stat.minfloatnullableB_z? The 1{sigma} upper limit on z (3)src.redshift;stat.maxfloatnullableAv[0/2.7] V-band dust extinction (4)magphys.absorption;em.opt.VfloatF24Spitzer/MIPS 24 micron band flux densityuJyphot.flux.density;em.IR.15-30umfloatlogLIR[10.21/11.51] Log of integrated 8-1000um luminosity (5)log(solLum)phys.luminosity;em.IRfloatSFRI+UIR and UV based Star Formation RatesolMass/yrphys.SFRfloatSFRUc[0.6/97] UV corrected based Star Formation RatesolMass/yrphys.SFRfloatRSFRLog of IR- to UV- based Star Formation Ratesphys.SFRfloatSCatCross-match within 1" with spectroscopic catalogs used to collect redshiftsmeta.ref.urlintnullable