J/ApJ/772/26ivo://CDS.VizieR/J/ApJ/772/26doi:10.26093/cds/vizier.17720026CDSAssef R.J.Stern D.Kochanek C.S.Blain A.W.Brodwin M.Brown M.J.I.,Donoso E.Eisenhardt P.R.M.Jannuzi B.T.Jarrett T.H.Stanford S.A.,Tsai C.-W.Wu J.Yan L.2017-10-09T13:34:28Z2015-02-26T11:50:36ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiinfrared-photometryredshiftedspectroscopyinterstellar-reddeningStern et al. (2012ApJ...753...30S, Paper I) presented a study of Wide-field Infrared Survey Explorer (WISE) selection of active galactic nuclei (AGNs) in the 2deg^2^ COSMOS field, finding that a simple criterion W1-W2>=0.8 provides a highly reliable and complete AGN sample for W2<15.05, where the W1 and W2 passbands are centered at 3.4{mu}m and 4.6{mu}m, respectively. Here we extend this study using the larger 9deg^2^ NOAO Deep Wide-Field Survey Bootes field which also has considerably deeper WISE observations than the COSMOS field, and find that this simple color cut significantly loses reliability at fainter fluxes. We define a modified selection criterion combining the W1-W2 color and the W2 magnitude to provide highly reliable or highly complete AGN samples for fainter WISE sources. In particular, we define a color-magnitude cut that finds 130+/-4deg^-2^ AGN candidates for W2<17.11 with 90% reliability. Using the extensive UV through mid-IR broadband photometry available in this field, we study the spectral energy distributions of WISE AGN candidates. We find that, as expected, the WISE AGN selection can identify highly obscured AGNs, but that it is biased toward objects where the AGN dominates the bolometric luminosity output. We study the distribution of reddening in the AGN sample and discuss a formalism to account for sample incompleteness based on the step-wise maximum-likelihood method of Efstathiou et al. The resulting dust obscuration distributions depend strongly on AGN luminosity, consistent with the trend expected for a receding torus. At L_AGN_~3x10^44^erg/s, 29%+/-7% of AGNs are observed as Type 1, while at ~4x10^45^erg/s the fraction is 64%+/-13%. The distribution of obscuration values suggests that dust in the torus is present as both a diffuse medium and in optically thick clouds.2013ApJ...772...26Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/772/26CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/311 : WISE All-Sky Data Release (Cutri+ 2012)II/290 : SWIRE Photometric Redshift Catalogue (Rowan-Robinson+, 2008)J/AJ/144/49 : Quasars from SDSS-DR7, WISE and UKIDSS surveys (Wu+, 2012)J/ApJS/200/8 : AGES: the AGN and Galaxy Evolution Survey (Kochanek+, 2012)J/ApJ/757/13 : IR SEDs of 24um z~0.3-3 galaxies (Sajina+, 2012)J/ApJ/751/52 : AGN cand. from the WISE, 2MASS, RASS (W2R) (Edelson+, 2012)J/ApJ/713/970 : Low-resolution SED templates for AGNs & gal. (Assef+, 2010)J/ApJ/710/1498 : QSO luminosity function at z~4 (Glikman+, 2010)J/ApJ/701/428 : The Spitzer Deep, Wide-Field Survey (SDWFS) (Ashby+, 2009)J/ApJ/684/905 : z>1 clusters from IRAC Shallow Survey (Eisenhardt+, 2008)J/AJ/133/186 : Opt. spectroscopy of 77 luminous AGNs and QSOs (Lacy+, 2007)J/ApJS/166/470 : SDSS-Spitzer type I QSOs IR photometry (Richards+, 2006)J/ApJ/642/673 : IR-selected obscured AGN candidates (Polletta+, 2006)J/ApJ/641/140 : Optical counterparts in the NDWFS Bootes field (Brand+, 2006)J/ApJ/640/167 : AGNs and ULIRGs in the CDF-South (Alonso-Herrero+, 2006)J/ApJS/161/9 : X-ray survey of the NDWFS Bootes field (Kenter+, 2005)J/AJ/123/1784 : 1.4 GHz imaging of the Bootes field (de Vries+, 2002)J/ApJS/95/1 : Atlas of Quasar Energy Distributions (Elvis+ 1994)http://wise2.ipac.caltech.edu/docs/release/allsky/expsup/ : Explanatoryhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/772/26https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/772/26http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/772/26https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/772/26https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/772/26http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/772/26GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/772/26/table5 (Summary of obscured AGN candidates observed with Keck/DEIMOS)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/772/26/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/772/26/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/772/26/table5?GETtext/xml+votable180.050000true216.97737534.01203060.005555555555555556Cone search capability for table J/ApJ/772/26/table6 (Additional results from Keck observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/772/26/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/772/26/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/772/26/table6?GETtext/xml+votable180.050000true216.805791734.151250.0055555555555555566/10513 10516 105183.830199579824256e-20 4.8065244008477756e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/772/26?format=asciiInfraredOpticaldefaultJ/ApJ/772/26/table5Summary of obscured AGN candidates observed with Keck/DEIMOSSimbadNameSimbad column added by the CDSmeta.idcharNotesNotesmeta.noterecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObscured AGN candidate namemeta.id;meta.maincharRAJ2000[14] Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000[33/35] Degree of declination (J2000)pos.eq.dec;meta.mainImag[19/23.7] I-band magnitudemagphot.mag;em.opt.IfloatW2mag[14.3/15.9] WISE W2 magnitude (4.6um)magphot.mag;em.IR.4-8umfloatW1-W2[0.5/2.1] W1-W2 color indexmagphot.color;em.IR;em.IRfloata[0.2/1] Best fit a parameter (1)phys.luminosity;arith.ratiofloate_a[0.004/0.2] a uncertaintystat.errorfloatE(B-V)[0.2/0.9] Reddening parameter for the adopted redshiftmagphot.color.excessfloate_E(B-V)[0.03/0.2] E(B-V) uncertaintymagstat.errorfloatz[0.2/1.5] Measured redshiftsrc.redshiftfloatu_zUncertainty flag on zmeta.code.error;src.redshiftcharq_z[ABF] Redshift quality flag, A=secure (G1)meta.code.qual;src.redshiftcharSelecSelection criteria (2)meta.noteJ/ApJ/772/26/table6Additional results from Keck observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTypeTarget Type: IRAC (AGN/cluster), MIPS, WISE AGN, XBootes or serendipmeta.idcharRAJ2000[14] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[33/35] Degree of Declination (J2000)pos.eq.dec;meta.mainz[0/3.4] Spectroscopic redshift (z=0.0 for stars)src.redshiftfloatq_z[AB] Quality in z (A=secure) (G1)meta.code.qual;src.redshiftcharMaskSlitmask(s) description (1)meta.notecharNotesAdditional spectral notesmeta.noteSimbadSimbad column added by the CDSmeta.ref.urlchar