J/ApJS/121/473ivo://CDS.VizieR/J/ApJS/121/473doi:10.26093/cds/vizier.21210473CDSBassani L.Dadina M.Maiolino R.Salvati M.Risaliti G.,Della Ceca R.Matt G.Zamorani G.2000-02-23T09:45:52Z2000-02-23T10:45:35ZCDS support team

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

cds-question@unistra.frseyfert-galaxiesx-ray-sourcesWe present and discuss a three-dimensional diagnostic diagram for Seyfert 2 galaxies obtained using X-ray and [O III] data on a large sample of objects (reported in the Appendix). The diagram shows the K{alpha} iron line equivalent width as a function of both the column density derived from the photoelectric cutoff and the 2-10 keV flux normalized to the [O III] optical-line flux (the latter corrected for extinction and assumed to be a true indicator of the source intrinsic luminosity). We find that the hard X-ray properties of type 2 objects depend on a single parameter, the absorbing column density along the line of sight, in accordance with the unified model. The diagram can be used to identify Compton-thick sources and to isolate and study peculiar objects. From this analysis we have obtained a column density distribution of Seyfert 2 galaxies that is thought to be a good approximation of the real distribution. A large population of heavily absorbed objects is discovered, including many Compton-thick candidates. Our results indicate that the mean log N_H_cm^-2^ in type 2 Seyfert galaxies is 23.5 and that as many as 23%-30% of sources have N_H_=>10^24^cm^-2^.1999ApJS..121..473Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/121/473CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/121/473https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/121/473http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/121/473https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/121/473https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/121/473http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/121/473GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/121/473/table1 (Catalog of Seyfert 2 Galaxies)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/121/473/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/121/473/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/121/473/table1?GETtext/xml+votable180.050000true2.541667-4.7105560.0055555555555555566/1701 2564 5795 7132 7214 7424 7606 7628 7659 7869 8845 9660 10398 10475 10977 11027 11101 11416 11615 12241 12805 12892 13511 14744 16042 17369 17754 18919 19130 19619 21016 21170 21450 21996 22654 22722 24896 25083 25610 25742 25790 25907 26071 26393 27767 27914 31161 33034 33920 34273 34531 34534 35055 35623 38653 38704 38868 40221 40410 41586 43233 43262 43339 43677 43925 45735 45883 46399 46442 46987 47047 47154https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/121/473?format=asciiX-raydefaultJ/ApJS/121/473/table1Catalog of Seyfert 2 GalaxiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intNameSeyfert galaxy namecharprimaryRAJ2000Right Ascension (J2000)DEJ2000Declination (J2000)zRedshiftdoubleClassSeyfert classification: S=Seyfert, L=Liner, SB=Starburstcharr_zReference for z and Class in refs.datcharColDGalactic H I column density1e+20cm**-2floatl_RatLimit on RatcharRat? Ratio of H{alpha} to H[beta}floatnullabler_ColDReferences for ColD and Rat in refs.datcharl_OIIILimit on OIIIcharOIII? Corrected [O III] flux1e-11mW.m**-2floatnullablee_OIII? uncertainty on the [O III] flux1e-11mW.m**-2floatnullablen_OIIIRemark on OIII (1)charr_OIIIReferences for OIII in refs.datcharJ/ApJS/121/473/table2Seyfert 2 spectral parametersl_EWLower limit on EWcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intNameSeyfert Galaxy namecharprimaryn_Name[ehg] Name flag (1)charGammaThe photon indexfloatE_Gamma? upper limit on Gammafloatnullablee_Gamma? lower limit on Gammafloatnullablen_Gamma[fj] note on Gamma: f = Fixed photon index, j = Parameter is pegged at the higher limitcharl_ColDLower limit on ColDcharColDHydrogen column density1e+20cm**-2floatn_ColDFlag indicating ColD and p_ColD is a rangecharE_ColD? Upper limit on ColD1e+20cm**-2floatnullablee_ColD? Lower limit on ColD1e+20cm**-2doublenullablef_ColD[d] Indicates parameter is pegged at lower limitcharEW? Iron K{alpha} line equivalent widtheVintnullableE_EW? Upper limit on EWeVintnullablee_EW? Lower limit on EWeVintnullablen_EWFlag indicating line in EW is at 6.7 KeVcharFxoObserved flux between 2-10 KeV1e-11mW.m**-2floatFxcAbsorption corrected flux between 2-10 KeV1e-11mW.m**-2floatn_FxcFlag indicating Fxc is the lower valuecharE_Fxc? Upper absorption corrected flux between 2-10 KeV1e-11mW.m**-2floatnullabler_NameReferences in refs.datintJ/ApJS/121/473/refsReferences for table1.dat and table2.datrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intSeqSequence number from table1.datintBibcodeReference code sequencecharComComments on referenceschar