J/ApJ/703/2160ivo://CDS.VizieR/J/ApJ/703/2160doi:10.26093/cds/vizier.17032160CDSTrouille L.Barger A.J.Cowie L.L.Yang Y.Mushotzky R.F.2017-10-13T15:41:47Z2011-11-21T12:11:07ZCDS support team

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

cds-question@unistra.frx-ray-sourcessurveysredshiftedactive-galactic-nucleiWe compare the optical spectral types with the X-ray spectral properties for a uniformly selected (sources with fluxes greater than the 3{sigma} level and above a flux limit of f(2-8keV)>3.5x10^-15^erg/cm^2^/s), highly spectroscopically complete (>80% for f(2-8keV)>10^-14^erg/cm^2^/s and >60% below) 2-8keV X-ray sample observed in three Chandra fields (CLANS, CLASXS, and the CDF-N) that cover ~1.2deg^2^. For our sample of 645 spectroscopically observed sources, we confirm that there is significant overlap of the X-ray spectral properties, as determined by the effective photon indices, {Gamma}_eff_, obtained from the ratios of the 0.5-2keV to 2-8keV counts, for the different optical spectral types. Thus, one cannot use the X-ray spectral classifications and the optical spectral classifications equivalently. Since it is not understood how X-ray and optical classifications relate to the obscuration of the central engine, we strongly advise against a mixed classification scheme, as it can only complicate the interpretation of X-ray AGN samples.2009ApJ...703.2160Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/703/2160CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-)J/ApJS/179/1 : The OPTX project: CLANS, CLASXS and CDF-N (Trouille+, 2008)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/703/2160https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/703/2160http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/703/2160https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/703/2160https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/703/2160http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/703/2160GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/703/2160/table2 (CLANS (Chandra Lockman Area North Survey) catalog, updated sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/703/2160/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/703/2160/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/703/2160/table2?GETtext/xml+votable180.050000true160.898358.97810.0055555555555555566/6077 6079https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/703/2160?format=asciiX-rayOpticaldefaultJ/ApJ/703/2160/table2CLANS (Chandra Lockman Area North Survey) catalog, updated sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCLANSObject identification (1)meta.id;meta.mainintRAJ2000Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainSctsNet soft counts in the 0.5-2keV bandctphot.count;em.X-rayfloatE_Scts1{sigma} positive error in Scts (2)ctstat.error;stat.maxfloate_Scts1{sigma} negative error in Scts (2)ctstat.errorfloatHctsNet hard counts in the 2-8keV bandctphot.count;em.X-rayfloatE_Hcts1{sigma} positive error in Hcts (2)ctstat.error;stat.maxfloate_Hcts1{sigma} negative error in Hcts (2)ctstat.errorfloatFsoftX-ray flux in the 0.5-2keV in units of 10^-15^erg/cm^2^/s = 10^-18^W/m^2^aW.m**-2phot.flux;em.X-ray;arith.ratiofloatE_Fsoft1{sigma} positive error in Fsoft (2)aW.m**-2stat.error;stat.maxfloate_Fsoft1{sigma} negative error in Fsoft (2)aW.m**-2stat.errorfloatFhardX-ray flux in the 2-8keV in units of 10^-15^erg/cm^2^/s = 10^-18^W/m^2^aW.m**-2phot.flux;em.X-rayfloatE_Fhard1{sigma} positive error in Fhard (2)aW.m**-2stat.error;stat.maxfloate_Fhard1{sigma} negative error in Fhard (2)aW.m**-2stat.errorfloatFtotX-ray flux in the 0.5-8keV in units of 10^-15^erg/cm^2^/s = 10^-18^W/m^2^aW.m**-2phot.flux;em.X-rayfloatE_Ftot1{sigma} positive error in Ftot (2)aW.m**-2stat.error;stat.maxfloate_Ftot1{sigma} negative error in Ftot (2)aW.m**-2stat.errorfloatzsp? Spectroscopic redshiftsrc.redshiftfloatnullableClassOptical spectral classification (3)meta.code.classintSimbadSimbad column added by the CDSmeta.refchar