J/A+A/459/693ivo://CDS.VizieR/J/A+A/459/693doi:10.26093/cds/vizier.34590693CDSAkylas A.Georgantopoulos I.Georgakakis A.Kitsionas S.,Hatziminaoglou E.2008-05-22T12:27:00Z2008-05-22T12:25:03ZCDS support team

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

cds-question@unistra.frsurveysactive-galactic-nucleix-ray-sourcesWe combine bright XMM-Newton data with the Chandra Deep Field South observations to explore the behavior of the intrinsic AGN absorption, as a function of redshift and luminosity. Our sample consists of 359 sources selected in the hard 2-8keV band, spanning the flux range 6x10^-16^-3x10^-13^erg/cm^2^/s with a high rate of spectroscopic or photometric redshift completeness (100 and 85 per cent respectively for the Chandra and XMM-Newton data). We derive the column density values using X-ray spectral fits. We find that the fraction of obscured AGN falls with increasing luminosity in agreement with previous findings. The fraction of obscured AGN shows an apparent increase at high redshifts (z>2). Simulations show that this effect can most probably be attributed to the fact that at high redshifts the column densities are overestimated.2006A&A...459..693Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/459/693CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/444/79 : XMM obs. of Lockman Hole brightest AGNs (Mateos+, 2005)J/MNRAS/366/171 : Red AGN in XMM/SDSS fields (Georgakakis+, 2006)J/A+A/451/457 : X-ray properties of AGN in CDFS (Tozzi+, 2006)J/ApJ/640/167 : AGNs and ULIRGs in the CDF-South (Alonso-Herrero+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/459/693https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/459/693http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/459/693https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/459/693https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/459/693http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/459/693GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/459/693/table2 (The X-ray spectral fitting results for the 153 sources of our XMM-Newton/SDSS sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/459/693/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/459/693/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/459/693/table2?GETtext/xml+votable180.050000true10.6961.0050.0055555555555555566/7242-7243 7280-7281 7308-7310 7552 11253 11347 11353 11596 11791 11802 11932-11933 11936 11938 17300 17749 17817 17819 17840-17842 18112 18114 18800 23149 23151 23190-23191 23210 26019-26020 26022-26023 26028 26175 36785https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/459/693?format=asciiX-raydefaultJ/A+A/459/693/table2The X-ray spectral fitting results for the 153 sources of our XMM-Newton/SDSS samplez? Redshfitsrc.redshiftfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[AGG2006][1,153]+ Sequential numbermeta.recordintprimaryindexedRAJ2000Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination sign in decimal degrees (J2000)degpos.eq.dec;meta.mainGammaSpectral index (1)spect.indexfloatE_Gamma? Error on Gamma (upper limit)stat.error;stat.maxfloatnullablee_Gamma? Error on Gamma (lower limit)stat.errorfloatnullablel_NHLimit flag on NHmeta.code.errorcharNHObserved hydrogen column density, best fit value1e+22cm**-2phys.columnDensityfloatE_NH? Error on NH (upper limit)1e+22cm**-2stat.error;stat.maxfloatnullablee_NH? Error on NH (lower limit)1e+22cm**-2stat.errorfloatnullableF2-8keVIntrinsic 2-8keV flux1e-17W.m**-2phot.flux;em.X-rayfloatNHgalGalactic column density in the directions of the observed field1e+20cm**-2phys.columnDensity;obs.fieldfloatNHintIntrinsic rest frame column density1e+22cm**-2phys.columnDensityfloatLogLumLogarithm of intrinsic 2-8keV luminositylog(1e-07W)phys.luminosity;em.X-rayfloatID[1/3] Flag for optical counterpart (2)meta.code.errorint