J/ApJ/693/1713ivo://CDS.VizieR/J/ApJ/693/1713doi:10.26093/cds/vizier.16931713CDSTreister E.Virani S.Gawiser E.Urry C.M.Lira P.Francke H.,Blanc G.A.Cardamone C.N.Damen M.Taylor E.N.Schawinski K.2017-10-02T19:28:12Z2010-12-08T15:23:40ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiredshiftedspectroscopyx-ray-sourcesgalaxiesvisible-astronomysurveysWe present the first results of our optical spectroscopy program aimed to provide redshifts and identifications for the X-ray sources in the Extended Chandra Deep Field South. A total of 339 sources were targeted using the IMACS spectrograph at the Magellan telescopes and the VIMOS spectrograph at the VLT. We measured redshifts for 186 X-ray sources, including archival data and a literature search. We find that the active galactic nucleus (AGN) host galaxies have on average redder rest-frame optical colors than nonactive galaxies, and that they live mostly in the "green valley". The dependence of the fraction of AGNs that are obscured on both luminosity and redshift is confirmed at high significance and the observed AGN spatial density is compared with the expectations from existing luminosity functions. These AGNs show a significant difference in the mid-IR to X-ray flux ratio for obscured and unobscured AGNs, which can be explained by the effects of dust self-absorption on the former. This difference is larger for lower luminosity sources, which is consistent with the dust opening angle depending on AGN luminosity.2009ApJ...693.1713Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/693/1713CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIII/250 : The VIMOS VLT deep survey (VVDS-DEEP) (Le Fevre+ 2005)J/ApJS/191/124 : Optical spectroscopy of X-ray sources (Silverman+, 2010)J/A+A/512/A12 : VLT/VIMOS spectroscopy in GOODS-South field (Balestra+, 2010)J/A+A/478/83 : GOODS-South Field VLT/FORS2 redshifts. III. (Vanzella+, 2008)J/A+A/454/423 : GOODS-South Field VLT/FORS2 redshifts. II. (Vanzella+, 2006)J/AJ/131/2373 : Extended Chandra Deep Field-South survey (Virani+, 2006)J/ApJ/640/603 : Catalog of AGNs in the GOODS fields (Treister+, 2006)J/A+A/434/53 : GOODS-South Field redshifts (Vanzella+, 2005)J/A+A/428/1043 : Redshifts from VIMOS VLT Deep Survey (Le Fevre+, 2004)J/ApJS/155/271 : Chandra Deep Field-South: Optical spectroscopy (Szokoly+,J/MNRAS/328/150 : KX redshift survey (Croom+, 2001)http://www.eso.org/sci/activities/garching/projects/goods/MasterSpectroscopy :https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/693/1713https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/693/1713http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/693/1713https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/693/1713https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/693/1713http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/693/1713GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/693/1713/table2 (X-ray, optical and mid-IR properties of the X-ray sources in the ECDF-S)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/693/1713/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/693/1713/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/693/1713/table2?GETtext/xml+votable180.050000true53.40425-27.69433330.0055555555555555566/35935 35957https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/693/1713?format=asciiX-rayOpticaldefaultJ/ApJ/693/1713/table2X-ray, optical and mid-IR properties of the X-ray sources in the ECDF-SrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDX-ray identification number (1)meta.id;meta.mainintFsoftSoft X-ray (0.5-2keV) flux (in erg/cm^2^/s/)mW.m**-2phot.flux;em.X-raydoubleFhardHard X-ray (2-8keV) flux (in erg/cm^2^/s/)mW.m**-2phot.flux;em.X-raydoubleHRHardness ratiophot.flux;arith.ratiofloatE_HRUpper error in HRstat.error;stat.maxfloate_HRLower error in HRstat.errorfloatzsp? Spectroscopic redshiftsrc.redshiftfloatnullabler_zspSource of spectrum (2)meta.ref;pos.framecharClassOptical classification (3)src.classcharLhard? Log of hard X-ray (2-8keV) luminositylog(1e-07W)phys.luminosity;em.X-rayfloatnullableF24um? 24 micron fluxmJyphot.flux.density;em.IR.15-30umfloatnullablee_F24um? Error in Flux-24mJystat.errorfloatnullabler_F24umSource of 24 microns photometry (4)meta.ref;pos.framecharGamma? {Gamma}, slope of the power lawspect.indexfloatnullableE_Gamma? Upper error in Gammastat.error;stat.maxfloatnullablee_Gamma? Lower error in Gammastat.errorfloatnullablelogNH? Log of neutral hydrogen (HI) column densitylog(cm**-2)phys.columnDensityfloatnullableSimbadSimbad column added by the CDSchar_RAPositions from Simbad (right ascension part)degpos.eq.ra;meta.main_DEPositions from Simbad (declination part)degpos.eq.dec;meta.main