J/MNRAS/445/1430ivo://CDS.VizieR/J/MNRAS/445/1430doi:10.26093/cds/vizier.74451430CDSKalfountzou E.Civano F.Elvis M.Trichas M.Green P.2024-08-14T20:18:13Z2016-02-10T14:54:00ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleix-ray-sourcesWe present results from an analysis of the largest high-redshift (z>3) X-ray-selected active galactic nucleus (AGN) sample to date, combining the Chandra Cosmological Evolution Survey and Chandra Multi-wavelength Project surveys and doubling the previous samples. The sample comprises 209 X-ray-detected AGNs, over a wide range of rest-frame 2-10keV luminosities logLX=43.3-46.0erg/s. X-ray hardness rates show that ~39 per cent of the sources are highly obscured, N_H_>10^22^cm^-2^, in agreement with the ~37 per cent of type-2 AGNs found in our sample based on their optical classification. For ~26 per cent of objects have mismatched optical and X-ray classifications. Utilizing the 1/Vmax method, we confirm that the comoving space density of all luminosity ranges of AGNs decreases with redshift above z>3 and up to z~7. With a significant sample of AGNs (N=27) at z>4, it is found that both source number counts in the 0.5-2keV band and comoving space density are consistent with the expectation of a luminosity-dependent density evolution (LDDE) model at all redshifts, while they exclude the luminosity and density evolution (LADE) model. The measured comoving space density of type-1 and type-2 AGNs shows a constant ratio between the two types at z>3. Our results for both AGN types at these redshifts are consistent with the expectations of LDDE model.2014MNRAS.445.1430Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/445/1430CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/284 : COSMOS Multi-Wavelength Photometry Catalog (Capak+, 2007)J/ApJS/150/19 : ChaMP. I. First X-ray source catalog (Kim+, 2004)J/ApJ/645/955 : ChaMP serendipitous galaxy cluster survey (Barkhouse+, 2006)J/AJ/131/2766 : Quasar luminosity function from SDSS-DR3 (Richards+, 2006)J/ApJS/201/30 : The Chandra COSMOS survey. III. (Civano+, 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/445/1430https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/445/1430http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/445/1430https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/445/1430https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/445/1430http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/445/1430GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/445/1430/tablea1 (Properties of the high-redshift AGN sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/445/1430/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/445/1430/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/445/1430/tablea1?GETtext/xml+votable180.050000true1.682-0.20.0055555555555555565/6814 6/4125 4159 4285 4512 4615 4708 4964 4977 5305 5439 5569 5609 5648 5923 5999 6069 6071 6219 6441 6552 6581 7178 7273 7281 7371 7510 8912 8921 8972 9037 9831 9855 10220 10302 10364 10515 10694 10707 10743 10759 10843 10968 11042 11130 11361 11427 11489 11589 11802 17743 17812 17819 17997 18061 18089 18534 19458 25595 25847 25853 25934 25945 25981 26022 26206 26212 26217 26221 26239 26281 26563 26568 27127 27247 27552 27617 27664 27733 28377 32500https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/445/1430?format=asciiX-raydefaultJ/MNRAS/445/1430/tablea1Properties of the high-redshift AGN sampleSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSurvey[1/2] survey: 1 = ChaMP; 2 = C-COSMOSmeta.noteintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainzspec? Spectroscopic redshiftsrc.redshiftfloatnullablezphot? Photometric redshiftsrc.redshiftfloatnullablel_b_zphotLimit flag on b_zphotmeta.code.errorcharb_zphot? Photometric redshift lower limitsrc.redshift.phot;stat.minfloatnullableB_zphot? Photometric redshift upper limitsrc.redshift.phot;stat.maxfloatnullableOType1[1/2]? Optical type (1)meta.code.classintnullableXType[1/2]? X-ray type based on N_H_=10^22^cm^-2^ limit (2)meta.code.classintnullableSsoftThe 0.5-2keV flux converted to {GAMMA}=1.8 (3)1e-16W.m**-2phot.flux;em.X-rayfloatlogLXThe 2-10keV luminosity in units of erg/slog(1e-07W)phys.luminosity;em.X-rayfloatHR? Hardness ratio (4)phot.flux;arith.ratiofloatnullableb_HR? HR lower limitmeta.notefloatnullableB_HR? HR upper limitmeta.notefloatnullablel_NH[<>= ] Limit flag on NHmeta.code.errorcharNH? The absorption column density1e+22cm**-2phys.columnDensityfloatnullable