J/A+A/488/417ivo://CDS.VizieR/J/A+A/488/417doi:10.26093/cds/vizier.34880417CDSFeruglio C.Fiore F.La Franca F.Sacchi N.Puccetti S.Comastri A.,Berta S.Gruppioni C.Mathur SMatute I.Mignoli M.Vignali C.,Zamorani G.2008-10-09T16:17:19Z2008-10-09T16:13:33ZCDS support team

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

cds-question@unistra.frsurveysx-ray-sourcesactive-galactic-nucleiastronomical-object-identificationWe present the optical identifications and a multi-band catalogue of a sample of 478 X-ray sources detected in the XMM-Newton and Chandra surveys of the central 0.6deg^2^ of the ELAIS-S1 field. The most likely optical/infrared counterpart of each X-ray source was identified using the chance coincidence probability in the R and IRAC 3.6 micron bands.This method was complemented by the precise positions obtained through Chandra observations. We were able to associate a counterpart to each X-ray source in the catalogue. Approximately 94% of them are detected in the R band, while the remaining are blank fields in the optical down to R~24.5, but have a near-infrared counterpart detected by IRAC within 6 arcsec from the XMM-Newton centroid. The multi-band catalogue, produced using the positions of the identified optical counterparts, contains photometry in ten photometric bands, from B to the MIPS 24 micron band. The spectroscopic follow-up allowed us to determine the redshift and classification for 237 sources (~50% of the sample) brighter than R=24. The spectroscopic redshifts were complemented by reliable photometric redshifts for 68 sources. We classified 47% of the sources with spectroscopic redshift as broad-line active galactic nuclei (BL AGNs) with z=0.1-3.5, while sources without broad-lines (NOT BL AGNs) are about 46% of the spectroscopic sample and are found up to z=2.6. The remaining fraction is represented by extended X-ray sources and stars. We spectroscopically identified 11 type 2 QSOs among the sources with X/O>8, with redshift between 0.9 and 2.6, high 2-10keV luminosity (logLx>=43.8erg/s) and hard X-ray colors suggesting large absorbing columns at the rest frame (logN_H_ up to 23.6cm^-2^). BL AGNs show on average blue optical-to-near-infrared colors, softer X-ray colors and X-ray-to-optical colors typical of optically selected AGNs. Conversely, narrow-line sources show redder optical colors, harder X-ray flux ratio and span a wider range of X-ray-to-optical colors. On average the Spectral Energy Distributions (SEDs) of high-luminosity BL AGNs resemble the power-law typical of unobscured AGNs. The SEDs of NOT BLAGNs are dominated by the galaxy emission in the optical/near-infrared, and show a rise in the mid-infrared which suggests the presence of an obscured active nucleus. We study the infrared-to-optical colors and near-infrared SEDs to infer the properties of the AGN host galaxies.2008A&A...488..417Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/488/417CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/457/501 : XMM-Newton survey of the ELAIS-S1 field (Puccetti+, 2006)J/A+A/451/881 : ESIS BVR catalog, ELAIS-S1 (Berta+, 2006)J/A+A/476/151 : SWIRE ELAIS-S1 IR-peak galaxy IR fluxes (Berta+, 2007)J/A+A/488/533 : ESIS VIMOS I,z photometry of ELAIS-S1 (Berta+, 2008)J/AJ/127/3075 : Mid-infrared population of ELAIS-S1 sample (La Franca+, 2004)J/MNRAS/325/1173 : ISO ELAIS 15{mu}m survey (Lari+, 2001)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/488/417https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/488/417http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/488/417https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/488/417https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/488/417http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/488/417GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/488/417/catalog (Multiband catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/488/417/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/488/417/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/488/417/catalog?GETtext/xml+votable180.050000true8.09948-43.668040.0055555555555555566/35387 35390 35473 354766.772611666688002e-21 6.185923063528282e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/488/417?format=asciiX-raydefaultJ/A+A/488/417/catalogMultiband catalogl_KmagLimit flag on Kmagmeta.code.errorcharl_VmagELimit flag on VmagEmeta.code.errorcharVmagE? V band magnitude (Vega) from ESIS catalogmagphot.mag;em.opt.VfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXMMES1[1/479] XMM sequential number \linkRole{ELAIS-S1 data from Puccetti et al. 2006, Cat. J/A+A/457/501}meta.id;meta.mainintRAJ2000XMM Right ascension (J2000.0)degpos.eq.ra;meta.mainDEJ2000XMM Declination (J2000.0)degpos.eq.dec;meta.mainFX0.5-10Flux 0.5-10keVmW.m**-2phot.flux;em.X-raydoublee_FX0.5-10? Error on Flux 0.5-10keVmW.m**-2stat.errordoublenullableSN0.5-10S/N in 0.5-10keV bandstat.likelihood;obsfloatFX2-10Flux 2-10keV bandmW.m**-2phot.flux;em.X-ray.mediumdoublee_FX2-10? Error on Flux 2-10keVmW.m**-2stat.errordoublenullableSN2-10S/N in 2-10keV bandstat.likelihood;obsfloatFX0.5-2Flux 0.5-2keV bandmW.m**-2phot.flux;em.X-ray.softdoublee_FX0.5-2? Error on Flux 0.5-2keVmW.m**-2stat.errordoublenullableSNX0.5-2S/N in 0.5-2keV bandstat.likelihood;obsfloatFX5-10Flux 5-10 keV bandmW.m**-2phot.flux;em.X-raydoublee_FX5-10? Error on Flux 5-10keVmW.m**-2stat.errordoublenullableSNFX5-10S/N in 5-10keV bandstat.likelihood;obsfloatChandra? Chandra IDmeta.idintnullableRACdeg? Chandra Right ascension (J2000.0)degpos.eq.ranullableDECdeg? Chandra Declination (J2000.0)degpos.eq.decdoublenullablecovCh[0/1] Flag, if area is covered by Chandra observations (1=yes, 0=no)meta.codeintESIS? ID in ESIS catalog \linkRole{nearby ESIS source}meta.id.crossintnullableRAEdeg? Right ascension (J2000.0) in ESIS catalogdegpos.eq.ranullableDEEdeg? Declination (J2000.0) in ESIS catalogdegpos.eq.decdoublenullablel_BmagELimit flag on BmagEmeta.code.errorcharBmagE? B band magnitude (Vega) from ESIS catalogmagphot.mag;em.opt.Bfloatnullablee_BmagE? B mag errormagstat.error;phot.mag;em.opt.Bfloatnullablee_VmagE? V mag errormagstat.error;phot.mag;em.opt.Vfloatnullablel_RmagELimit flag on RmagEmeta.code.errorcharRmagE? R band magnitude (Vega) from ESIS catalogmagphot.mag;em.opt.Rfloatnullablee_RmagE? R mag errormagstat.error;phot.mag;em.opt.RfloatnullableRAVdeg? VIMOS/VLT Right ascension (J2000.0)degpos.eq.ranullableDEVdeg? VIMOS/VLT Declination (J2000.0)degpos.eq.decdoublenullablel_RmagBestLimit flag on RmagBestmeta.code.errorcharRmagBest? R band magnitude (Vega) from VIMOS (mag_best)magphot.mag;em.opt.Rfloatnullablee_RmagBest? R mag errormagstat.errorfloatnullableRell? Ellipticity in R bandmeta.notefloatnullableRflg? Sextractor flags in R bandmeta.codeintnullableRs/g? Star/galaxy separation in R band (0 for galaxy)src.class.starGalaxyfloatnullableProbOptChance coincidence probability (R band)stat.probabilityfloatDXOpt? X-ray to optical position offsetarcsecpos.angDistancefloatnullableRAOdeg? J-band Right ascension (J2000.0)degpos.eq.ranullableDEOdeg? J-band Declination (J2000.0)degpos.eq.decdoublenullableJmagBest? J band magnitude (Vega)magphot.mag;em.IR.Jfloatnullablee_JmagBest? J mag errormagstat.errorfloatnullableKmag? K band magnitude (Vega) (mag_best)magphot.mag;em.IR.Kfloatnullablee_Kmag? K mag errormagstat.error;phot.mag;em.IR.KfloatnullableKell? Ellipticity in K bandmeta.notefloatnullableKflg? Sextractor flags in K bandmeta.codeintnullableKs/g? Star/galaxy separation in K band (0 for galaxy)src.class.starGalaxyfloatnullableIRAC? Swire IRAC IDmeta.id.crossintnullableRAIdeg? IRAC Right ascension (J2000.0)degpos.eq.ranullableDEIdeg? IRAC Declination (J2000.0)degpos.eq.decdoublenullableF3.6um? IRAC 3.6um fluxuJyphot.mag;em.IR.3-4umdoublenullablee_F3.6um? IRAC 3.6um flux erroruJystat.errorfloatnullableF4.5um? IRAC 4.5um fluxuJyphot.mag;em.IR.4-8umdoublenullablee_F4.5um? IRAC 4.5um flux erroruJystat.errorfloatnullableF5.8um? IRAC 5.8um fluxuJyphot.flux.density;em.IR.4-8umdoublenullablee_F5.8um? IRAC 5.8um flux erroruJystat.errorfloatnullableF8.0um? IRAC 8.0um fluxuJyphot.flux.density;em.IR.8-15umdoublenullablee_F8.0um? IRAC 8.0um flux erroruJystat.errorfloatnullableF24um? MIPS 24um fluxuJyphot.flux.density;em.IR.15-30umdoublenullablee_F24um? MIPS 24um flux erroruJystat.errorfloatnullableDXIR? X-ray to IRAC position offsetarcsecpos.angDistancefloatnullableProbIR? Chance coincidence probability (IRAC 3.6 micron)stat.probabilityfloatnullableTelPhotometry from : 2.2=ESO/WFI 8.0=VIMOS/VLTmeta.id;instr.telfloatz? or -1.0 Spectroscopic redshiftsrc.redshiftfloatnullableq_z? Redshift quality flag (1)meta.code.qual;src.redshiftfloatnullableClass? Classification (2)src.classintnullableInstInstrument (3)meta.id;instrintSED? SED classification (4)meta.code.class;src.classintnullablezpho? Best fit Photometric redshiftsrc.redshift.photfloatnullablechi2? Chi squared for Photometric redshift fitstat.fit.chi2doublenullable