J/ApJ/815/L13ivo://CDS.VizieR/J/ApJ/815/L13doi:10.26093/cds/vizier.18159013CDSRicci C.Ueda Y.Koss M.J.Trakhtenbrot B.Bauer F.E.Gandhi P.2017-12-05T05:10:28Z2016-04-04T08:08:57ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleix-ray-sourcesredshiftedline-intensitiesastronomical-object-identificationHeavily obscured accretion is believed to represent an important stage in the growth of supermassive black holes and to play an important role in shaping the observed spectrum of the cosmic X-ray background. Hard X-ray (E>10keV) selected samples are less affected by absorption than samples selected at lower energies, and are therefore one of the best ways to detect and identify Compton-thick (CT, logN_H_>=24) active galactic nuclei (AGNs). In this letter we present the first results of the largest broadband (0.3-150keV) X-ray spectral study of hard X-ray selected AGNs to date, focusing on the properties of heavily obscured sources. Our sample includes the 834 AGNs (728 non-blazar, average redshift z~0.055) reported in the 70-month catalog of the all-sky hard X-ray Swift/Burst Alert Monitor survey. We find 55 CT AGNs, which represent 7.6_-2.1_^+1.1^% of our non-blazar sample. Of these, 26 are reported as candidate CT AGNs for the first time. We correct for selection bias and derive the intrinsic column density distribution of AGNs in the local universe in two different luminosity ranges. We find a significant decrease in the fraction of obscured Compton-thin AGNs for increasing luminosity, from 46+/-3% (for logL_14-195_=40-43.7) to 39+/-3% (for logL_14-195_=43.7-46). A similar trend is also found for CT AGNs. The intrinsic fraction of CT AGNs with logN_H_=24-25 normalized to unity in the logN_H_=20-25 range is 27+/-4%, and is consistent with the observed value obtained for AGNs located within 20Mpc.2015ApJ...815L..13Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/815/L13CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-2014)B/xmm : XMM-Newton Obs. Log (XMM-Newton Science Operation Center, 2012)VII/274 : The Roma BZCAT - 5th edition (Massaro+, 2015)J/ApJ/808/185 : NuSTAR surveys: COSMOS catalog (Civano+, 2015)J/ApJ/802/89 : Luminosity function of X-ray-selected AGNs (Buchner+, 2015)J/ApJS/207/19 : Hard X-ray survey from Swift-BAT 2004-2010 (Baumgartner+, 2013)J/ApJ/763/111 : X-ray spectral analysis of Swift/BAT AGNs (Vasudevan+, 2013)J/ApJ/749/21 : AGNs detected by 60 month Swift/BAT survey (Ajello+, 2012)J/MNRAS/413/1206 : XMM survey of 12um selected galaxies (Brightman+, 2011)J/ApJ/739/57 : Ultra hard X-ray AGNs in the Swift/BAT survey (Koss+, 2011)J/ApJ/728/58 : Swift-BAT survey of AGNs (Burlon+, 2011)J/A+A/524/A64 : The 54-month Palermo BAT-survey catalogue (Cusumano+, 2010)J/A+A/520/A47 : Blazars in the Swift-BAT hard X-ray sky (Maselli+, 2010)J/A+A/505/417 : Second INTEGRAL AGN catalogue (Beckmann+, 2009)J/ApJ/681/113 : Swift BAT survey of AGNs (Tueller+, 2008)J/ApJ/673/96 : BAT X-ray Survey - III (Ajello+, 2008)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/815/L13https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/815/L13http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/815/L13https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/815/L13https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/815/L13http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/815/L13GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/815/L13/table1 (Compton-thick (CT, logN_H_>=24) AGNs in the Swift/BAT 70-month catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/815/L13/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/815/L13/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/815/L13/table1?GETtext/xml+votable180.050000true7.7138-59.07680.0055555555555555566/2390 2846 3223 6029 6376 6458 7277 7424 7552 7741 7869 9093 11006 11726 13021 13040 16042 17754 18897 19376 20000 20171 22585 22975 27722 31158 33248 33507 34318 34861 35071 35407 35447 36062 36618 36861 36896 37117 38314 38868 39138 40013 40250 41586 42027 42120 43233 43294 43339 43625 44660 46399 46811 46865 48321https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/815/L13?format=asciiX-rayOpticaldefaultJ/ApJ/815/L13/table1Compton-thick (CT, logN_H_>=24) AGNs in the Swift/BAT 70-month catalogz[0.001/0.3] Redshiftsrc.redshiftfloatXIDCounterpart namemeta.idcharlogNH[24/25.6] Hydrogen column densitycm**-2phys.columnDensityfloatf_B_logNH[n] n: B_logNH is not constrainedmeta.codecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSWIFTSwift identifier (JHHMM.m+DDMMA)meta.id;meta.maincharf_SWIFTFlag on SWIFT (1)meta.codecharType? Optical classification (2)src.classfloatnullabler_Type[c] Flag on Type (1)meta.notecharb_logNH[23.7/25.1] 90% confidence lower value of logNHcm**-2stat.fit.paramfloatB_logNH[24/25.5]? 90% confidence upper value of logNHcm**-2stat.fit.paramfloatnullablel_EW[<=> ] Limit flag on EWmeta.code.error;spect.line.eqWidthcharEW[0/7300]? Fe K{alpha} equivalent widtheVspect.line.eqWidth;em.IR.KintnullableE_EW[32/4056]? Positive error on EWeVstat.error;stat.maxintnullablee_EW[6/5641]? Negative error on EWeVstat.error;spect.line.eqWidthintnullablef_EW[n] n: EW is not constrainedmeta.codecharGam2-10[-3/1.3]? 2-10keV photon index (3)spect.indexfloatnullableE_Gam2-10[0.02/5.1]? Positive error on Gam2-10stat.error;stat.maxfloatnullablee_Gam2-10[0/2.6]? Negative error on Gam2-10stat.errorfloatnullablef_Gam2-10[n] n: Blank value(s) are not constrainedmeta.codecharGamma[1.4/2.8] 0.3-150keV photon indexspect.indexfloatE_Gamma[0.01/0.9] Positive error on Gammastat.error;stat.maxfloate_Gamma[0.01/1] Negative error on Gammastat.errorfloatlogL2-10[41.3/45.3] 2-10keV intrinsic luminosity (i.e., absorption and k-corrected) in erg/slog(1e-07W)phys.luminosity;em.X-rayfloatlogL[42/45.3] 14-150keV intrinsic luminosity (i.e., absorption and k-corrected) in erg/slog(1e-07W)phys.luminosity;em.X-rayfloatObsX-ray observatory used for the soft X-ray spectra (4)meta.id;instr.obstycharSimbadSimbad column added by the CDSmeta.ref.urlcharNEDSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main