J/ApJ/653/127ivo://CDS.VizieR/J/ApJ/653/127doi:10.26093/cds/vizier.16530127CDSShi Y.Rieke G.H.Hines D.C.Gorjian V.Werner M.W.Cleary K.,Low F.J.Smith P.S.Bouwman J.2018-01-05T08:55:31Z2008-11-29T14:52:39ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleichemical-abundancesWe describe observations of 9.7um silicate features in 97 AGNs, exhibiting a wide range of AGN types and of X-ray extinction toward the central nuclei. We find that the strength of the silicate feature correlates with the HI column density estimated from fitting the X-ray data, such that low HI columns correspond to silicate emission, while high columns correspond to silicate absorption. The behavior is generally consistent with unification models in which the large diversity in AGN properties is caused by viewing-angle-dependent obscuration of the nucleus. Radio-loud AGNs and radio-quiet quasars follow roughly the correlation between HI columns and the strength of the silicate feature defined by Seyfert galaxies. The agreement among AGN types suggests a high-level unification with similar characteristics for the structure of the obscuring material. We demonstrate the implications for unification models qualitatively with a conceptual disk model. The model includes an inner accretion disk (<0.1pc in radius), a middle disk (0.110pc in radius) with a dense diffuse component and with embedded denser clouds, and an outer clumpy disk (10-300pc in radius).2006ApJ...653..127Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/653/127CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/653/127https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/653/127http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/653/127https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/653/127https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/653/127http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/653/127GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/653/127/table1 (Source Characteristics)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/653/127/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/653/127/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/653/127/table1?GETtext/xml+votable180.050000true13.396212.69290.0055555555555555566/269 530 647 725 1008 2216 2245 4405 4536 5090 5290 5333 5731 5975 7132 8017 8043 8071 8420 8612 8922 8941 8943 8973 9223 9402 10039 10217 10364 10472 10817 10877 11206 11667 11829 12630 12631 13707 14744 16059 16301 17754 18524 18639 18683 19416 19567 19637 19678 19730 19830 19932 21450 25742 25790 25907 26071 26125 26148 26292 27593 27767 27848 27862 27976 28031 28113 28356 28574 32408 32499 34104 34534 34881 35623 36771 38268 38653 38704 38868 39836 40221 40777 41586 43339 43677 43806 43877 43925 45222 45735 46615 46811 46987 47047 49042https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/653/127?format=asciiOpticaldefaultJ/ApJ/653/127/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference numbermeta.id;meta.mainintBibCodeBibCodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharJ/ApJ/653/127/table1Source CharacteristicsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource namemeta.id;meta.maincharzRedshiftsrc.redshiftfloatTypeAGN type (1)src.classcharStrSilicate feature strength (2)spect.line.strengthfloatE_Str? Upper uncertainty limit in Strstat.error;stat.maxfloatnullablee_Str? Lower uncertainty limit in Strstat.errorfloatnullabler_StrReference on Str, in refs.dat filemeta.ref;pos.frameintl_NHLimit flag on NHmeta.code.errorcharNH? Intrinsic H I column density1e+22cm**-2phys.columnDensitydoublenullableE_NH? Upper uncertainty limit in NH1e+22cm**-2stat.error;stat.maxfloatnullablee_NH? Lower uncertainty limit in NH1e+22cm**-2stat.errorfloatnullabler_NH? Reference on NH, in refs.dat filemeta.ref;pos.frameintnullableSimbadNameSimbad column added by the CDSmeta.idcharNEDSimbad column added by the CDSchar_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