J/ApJ/708/584ivo://CDS.VizieR/J/ApJ/708/584doi:10.26093/cds/vizier.17080584CDSEckart M.E.McGreer I.D.Stern D.Harrison F.A.Helfand D.J.2017-09-20T05:13:44Z2012-03-16T14:49:09ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiinfrared-photometryx-ray-sourcesWe compare the relative merits of active galactic nuclei (AGNs) selection at X-ray and mid-infrared wavelengths using data from moderately deep fields observed by both Chandra and Spitzer. The X-ray-selected AGN sample and associated photometric and spectroscopic optical follow-up are drawn from a subset of fields studied as part of the Serendipitous Extragalactic X-ray Source Identification (SEXSI) program. Mid-infrared data in these fields are derived from targeted and archival Spitzer imaging, and mid-infrared AGN selection is accomplished primarily through application of the Infrared Array Camera (IRAC) color-color AGN "wedge" selection technique. Nearly all X-ray sources in these fields which exhibit clear spectroscopic signatures of AGN activity have mid-infrared colors consistent with IRAC AGN selection. These are predominantly the most luminous X-ray sources. X-ray sources that lack high-ionization and/or broad lines in their optical spectra are far less likely to be selected as AGNs by mid-infrared color selection techniques. The fraction of X-ray sources identified as AGNs in the mid-infrared increases monotonically as the X-ray luminosity increases. Conversely, only 22% of mid-infrared-selected AGNs are detected at X-ray energies in the moderately deep (t_exp_~100ks) SEXSI Chandra data.2010ApJ...708..584Ehttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/708/584CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/660/167 : Spitzer AGN candidates in CDFN (Donley+, 2007)J/A+A/466/823 : Hard 2-10kev X-ray selected sources (Georgantopoulos+, 2007)J/ApJS/165/19 : SEXSI catalog. III (Eckart+, 2006)J/ApJS/156/35 : SEXSI catalog. II (Eckart+, 2005)J/AJ/129/2074 : Faint Chandra sources in SWIRE (Franceschini+, 2005)J/ApJ/596/944 : SEXSI catalog (Harrison+, 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/708/584https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/708/584http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/708/584https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/708/584https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/708/584http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/708/584GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/708/584/table2 (SEXSI-Spitzer catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/708/584/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/708/584/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/708/584/table2?GETtext/xml+votable180.050000true132.041458344.81733330.0055555555555555566/6495 7178 7273 10344 10345 10387 11632 18878 192206.772611666688002e-21 3.3785437584409506e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/708/584?format=asciiX-rayInfrareddefaultJ/ApJ/708/584/table2SEXSI-Spitzer catalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCXOSEXSIThe IAU-registered name (JHHMMSS.s+DDMMSS)meta.id;meta.mainchardelRACorrected X-ray/Spitzer Right Ascension position difference (2)arcsecpos.eq.ra;arith.difffloatdelDECorrected X-ray/Spitzer Declination position difference (2)arcsecpos.eq.dec;arith.difffloatHfluxGalactic absorption adjusted 2-10keV flux; in units of 10^-15^erg/cm^2^/saW.m**-2phot.flux;em.X-raydoubleHRHardness Ratio (3)phot.flux;arith.ratiofloatl_Rmag[0/1] Limit flag on Rmag: 1=Rmag is a lower limit (0= Rmag is actual)meta.code.errorcharRmag? The R band magnitudemagphot.mag;em.opt.Rfloatnullablen_Rmag[1,6] Optical ID Flag (4)meta.noteintlogFxFo? Log of Hflux (2-10keV) to optical flux ratiophot.flux;arith.ratiofloatnullableClassObject type (5)src.classcharz? Redshiftsrc.redshiftfloatnullablelogLx? Log of 2-10keV luminosity in erg/s (6)log(1e-07W)phys.luminosity;em.X-rayfloatnullablel_nH[ <]? Flag on nH (7)meta.code.errorcharnH? Log of H column densitylog(cm**-2)phys.columnDensityfloatnullableF3.6? Flux in Spitzer/IRAC 3.6um imageuJyphot.mag;em.IR.3-4umfloatnullablee_F3.6? Error in F3.6uJystat.errorfloatnullablef_F3.6[0,7] Flag on F3.6 (8)meta.codeintF4.5? Flux in Spitzer/IRAC 4.5um imageuJyphot.mag;em.IR.4-8umfloatnullablee_F4.5? Error in F4.5uJystat.errorfloatnullablef_F4.5[0,7] Flag on F4.5 (8)meta.codeintF5.8? Flux in Spitzer/IRAC 5.6um imageuJyphot.flux.density;em.IR.4-8umfloatnullablee_F5.8? Error in F5.8uJystat.errorfloatnullablef_F5.8[0,8] Flag on F5.8 (8)meta.codeintF8.0? Flux in Spitzer/IRAC 8.0um imageuJyphot.flux.density;em.IR.8-15umfloatnullablee_F8.0? Error in F8.0uJystat.errorfloatnullablef_F8.0[0,8] Flag on F8.0 (8)meta.codeintF24? Flux in Spitzer/MIPS 24um imageuJyphot.flux.density;em.IR.15-30umfloatnullablee_F24? Error in F24uJystat.errorfloatnullablef_F24[0,8] Flag on F24 (8)meta.codeintSimbadSimbad column added by the CDScharNEDSimbad column added by the CDScharRAJ2000[08,22] Hour of Right Ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000[03,67] Degree of Declination (J2000) (1)pos.eq.dec;meta.main