J/A+A/626/A9ivo://CDS.VizieR/J/A+A/626/A9doi:10.26093/cds/vizier.36260009CDSMignoli M.Feltre A.Bongiorno A.Calura F.Gilli R.Vignali C.,Zamorani G.Lilly S.J.Le Fevre O.Bardelli S.Bolzonella M.,Bordoloi R.Le Brun V.Caputi K.I.Cimatti A.Diener C.Garilli B.,Koekemoer A.M.Maier C.Mainieri V.Peng Y.Perez Montero E.,Silverman J.D.Zucca E.2019-08-06T14:42:16Z2019-06-04T08:11:56ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiquasarsvisible-astronomyspectroscopyWe select a sample of 90 obscured (type 2) AGN with 1.45<z<3.05 from the zCOSMOS-deep galaxy sample by 5 sigma-detection of the high-ionization CIV {lambda}1549 narrow emission line. The presence of this feature in a galaxy spectrum is often associated with nuclear activity, and the selection effectiveness has been also confirmed by ultraviolet (UV) emission line ratio diagnostic diagrams. Applying the same selection technique, a sample of 102 unobscured (type 1) AGN was collected. Taking advantage of the large amount of multi-band data available in the COSMOS field, we investigate the properties of the CIV-selected type 2 AGN, focusing on their host galaxies, X-ray emission and UV emission lines. Finally, we investigate the physical properties of the ionized gas in the Narrow Line Region (NLR) of this type 2 AGN sample, combining the analysis of strong UV emission lines with predictions from photo-ionization models. We find that, in order to successfully reproduce the relative intensity of UV emission lines of the selected high-z type 2 AGN, two new ingredients in the photo-ionization models are fundamental,i.e. small inner radii of the NLR (~90pc for LAGN=10^45^erg/s) and the internal dissipative micro-turbulence of the gas emitting clouds (with v_micr_~100km/s). With these modified models, we compute the gas-phase metallicity of the NLR, and our measurements indicate a statistically significant evolution of the metal content with redshift. Finally, we do not observe, in our CIV-selected type 2 AGN sample, a strong relationship between the NLR gas metallicity and the stellar mass of the host galaxy.2019A&A...626A...9Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/626/A9CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/626/A9https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/626/A9http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/626/A9https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/626/A9https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/626/A9http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/626/A9GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/626/A9/sample (unobscured type 2 AGN)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/626/A9/sample?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/626/A9/sample?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/626/A9/sample?GETtext/xml+votable180.050000true150.29883312.04719390.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/626/A95/6814 6/https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/626/A9?format=asciiOpticaldefaultJ/A+A/626/A9/sampleunobscured type 2 AGNrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintzCOSMOSId from the zCOSMOS-deep surveymeta.id;meta.mainintz? Redshiftsrc.redshiftfloatnullablespShow the specturmmeta.ref.urlcharVIMOSspName of the fits file with VIMOS spectrum, in subdirectory fitsmeta.id;meta.fitscharlogM*? Stellar mass of the host galaxylog(solMass)phys.massfloatnullableE(B-V)? AGN extinction provided by the SED fitting routinemagphot.color.excessfloatnullableChi2? Chi square goodness of fitstat.fit.chi2floatnullablepdf1Show the [O/H] probability density functionmeta.ref.urlchar[O/H]PDFName of the file with [O/H] probability density function, in subdirectory fitsmeta.idcharpdf2Show the U probability density functionmeta.ref.urlcharUPDFName of the file with logU probability density function, in subdirectory fitsmeta.notechar_RARef1 position from spectrum fits headers (right ascension part)degpos.eq.ra;meta.main_DERef1 position from spectrum fits headers (declination part)degpos.eq.dec;meta.main