J/ApJ/703/1778ivo://CDS.VizieR/J/ApJ/703/1778doi:10.26093/cds/vizier.17031778CDSSacchi N.La Franca F.Feruglio C.Fiore F.Puccetti S.Cocchia F.,Berta S.Brusa M.Cimatti A.Comastri A.Franceschini A.Gruppioni C.,Maiolino R.Matute I.Polletta M.Pozzetti L.Pozzi F.Vignali C.,Zamorani G.Oliver S.Rowan-Robinson M.Smith G.Lonsdale C.2017-12-22T05:32:48Z2010-02-08T14:50:29ZCDS support team

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

cds-question@unistra.frsurveysgalaxiesinfrared-sourcesactive-galactic-nucleiredshiftedWe present a catalog of optical spectroscopic identifications of sources detected by Spitzer at 3.6 or 24um down to ~10 and ~280uJy, respectively, in the SWIRE/XMM-Newton/ELAIS-S1 field and classified via line width analysis and diagnostic diagrams. A total of 1376 sources down to R~24.2mag have been identified (1362 detected at 3.6um, 419 at 24um, and 405 at both) by low-resolution optical spectroscopy carried out with FORS2, VIMOS, and EFOSC2 at the Very Large Telescope and 3.6m ESO telescope. The spectroscopic campaigns have been carried out over the central 0.6deg^2^ area of ELAIS-S1 which, in particular, has also been observed by XMM-Newton and Chandra. We find the first direct optical spectroscopic evidence that the fraction of active galactic nuclei (AGNs; mostly AGN2) increases with increasing F(24um)/F(R) ratio, reaching values of 70(+/-20)% in the range 316<F(24um)/F(R)<1000. We present an Infrared Array Camera-Multiband Imaging Photometer color-color diagram able to separate AGN1 from obscured AGN2 candidates. After having corrected for the spectroscopic incompleteness of our sample, the result is that the AGN fraction at F(24um)~0.8mJy is ~22(+/-7)% and decreases slowly to ~19(+/-5)% down to F(24um)~0.3mJy.2009ApJ...703.1778Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/703/1778CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/451/881 : ESIS BVR catalog, ELAIS-S1 (Berta+, 2006)J/A+A/457/501 : XMM-Newton survey of the ELAIS-S1 field. I. (Puccetti+, 2006)J/A+A/488/417 : XMM-Newton survey of the ELAIS-S1 field. II. (Feruglio+, 2008)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/703/1778https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/703/1778http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/703/1778https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/703/1778https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/703/1778http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/703/1778GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/703/1778/table2 (The spectroscopic catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/703/1778/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/703/1778/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/703/1778/table2?GETtext/xml+votable180.050000true8.2143-43.802020.0055555555555555566/35387 35390 35473 35476https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/703/1778?format=asciiOpticalInfrareddefaultJ/ApJ/703/1778/table2The spectroscopic catalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqRunning identification numbermeta.id;meta.mainintESISESIS identification from Berta et al., 2006, Cat. <J/A+A/451/881>meta.id;meta.maincharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainRmagR band Vega magnitudemagphot.mag;em.opt.RfloatzRedshift (spectroscopic)src.redshiftfloatq_zQuality code for z (2=reliable) (1)meta.code.qual;src.redshiftfloatClass[1/5] Spectroscopic classification code (2)src.classintS3.6um? Log of 3.6 micron band flux densitylog(uJy)phot.mag;em.IR.3-4umfloatnullableS24um? Log of 24 micron band flux densitylog(uJy)phot.flux.density;em.IR.15-30umfloatnullableXMMES1? XMM source name (4)meta.idintnullableSWIRESWIRE identification name, SWIRE3_JHHMMSS.ss+DDMMSS.s (3)meta.idcharSimbadSimbad column added by the CDSchar