J/ApJ/849/53ivo://CDS.VizieR/J/ApJ/849/53doi:10.26093/cds/vizier.18490053CDSHickox R.C.Myers A.D.Greene J.E.Hainline K.N.Zakamska N.L.,DiPompeo M.A.2018-08-20T08:25:31Z2018-07-17T13:09:05ZCDS support team

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

cds-question@unistra.frquasarsspectral-energy-distributionsurveysWe present observed mid-infrared and optical colors and composite spectral energy distributions (SEDs) of type 1 (broad-line) and 2 (narrow-line) quasars selected from Sloan Digital Sky Survey (SDSS) spectroscopy. A significant fraction of powerful quasars are obscured by dust and are difficult to detect in optical photometric or spectroscopic surveys. However, these may be more easily identified on the basis of mid-infrared (MIR) colors and SEDs. Using samples of SDSS type 1 and 2 matched in redshift and [OIII] luminosity, we produce composite rest-frame 0.2-15{mu}m SEDs based on SDSS, UKIDSS, and Wide-field Infrared Survey Explorer photometry and perform model fits using simple galaxy and quasar SED templates. The SEDs of type 1 and 2 quasars are remarkably similar, with the differences explained primarily by the extinction of the quasar component in the type 2 systems. For both types of quasar, the flux of the active galactic nucleus (AGN) relative to the host galaxy increases with AGN luminosity (L_[OIII]_) and redder observed MIR color, but we find only weak dependencies of the composite SEDs on mechanical jet power as determined through radio luminosity. We conclude that luminous quasars can be effectively selected using simple MIR color criteria similar to those identified previously (W1-W2>0.7; Vega), although these criteria miss many heavily obscured objects. Obscured quasars can be further identified based on optical-IR colors (for example, (u-W3[AB]>1.4(W1-W2[Vega])+3.2). These results illustrate the power of large statistical studies of obscured quasars selected on the basis of MIR and optical photometry.2017ApJ...849...53Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/849/53CatalogResearchIsServedByTAP VizieR generic servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)II/312 : GALEX-DR5 (GR5) sources from AIS and MIS (Bianchi+ 2011)II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)VII/241 : The 2dF QSO Redshift Survey (Croom+ 2004)VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)II/328 : AllWISE Data Release (Cutri+ 2013)VIII/92 : The FIRST Survey Catalog, Version 2014Dec17 (Helfand+ 2015)J/ApJS/95/1 : Atlas of Quasar Energy Distributions (Elvis+ 1994)J/AJ/126/2125 : SDSS candidate type II quasars (Zakamska+, 2003)J/AJ/128/1002 : SDSS candidate type II quasars. II (Zakamska+, 2004)J/ApJ/640/167 : AGNs and ULIRGs in the CDF-South (Alonso-Herrero+, 2006)J/ApJ/642/673 : IR-selected obscured AGN candidates (Polletta+, 2006)J/A+A/457/517 : ATESP 5 GHz radio survey. I. (Prandoni+, 2006)J/ApJS/166/470 : SDSS-Spitzer type I QSOs IR photometry (Richards+, 2006)J/ApJ/654/115 : DEEP2 Galaxy Redshift Survey: SDSS QSOs (Coil+, 2007)J/AJ/133/2222 : Clustering of high-redshift QSOs from SDSS (Shen+, 2007)J/ApJ/658/815 : Radio loudness of active galactic nuclei (Sikora+, 2007)J/AJ/136/2373 : Type 2 quasars from SDSS (Reyes+, 2008)J/ApJS/180/67 : Photometric selection of QSOs from SDSS. II. (Richards+, 2009)J/ApJ/713/970 : Low-resolution SED templates for AGNs & gal. (Assef+, 2010)J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)J/ApJ/751/52 : AGN cand. from the WISE, 2MASS, RASS (W2R) (Edelson+, 2012)J/ApJ/754/45 : IR properties of Swift/BAT X-ray AGNs (Ichikawa+, 2012)J/ApJ/757/13 : IR SEDs of 24um z~0.3-3 galaxies (Sajina+, 2012)J/ApJ/772/26 : AGN with WISE. II. The NDWFS Bootes field (Assef+, 2013)J/ApJS/208/24 : Spitzer MIR AGN survey. I. (Lacy+, 2013)J/ApJ/790/54 : AGN models according to a UV to Mid-IR study (Chung+, 2014)J/ApJ/791/113 : MIR-selected quasar parameters (Dai+, 2014)J/ApJ/804/27 : NIR photometry of hot dust-obscured galaxies (Assef+, 2015)J/ApJS/221/12 : AGNs in the MIR using AllWISE data (Secrest+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/849/53https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/849/53http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/849/53https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/849/53https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/849/53http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/849/53GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/ApJ/849/53/table1*Composite QSO 1 and 2 SEDSrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlogWave[-0.7/1.3] Log wavelengthlog(um)em.wlfloatlogSED1[-1.5/0.5] Log scaled F_{nu}_ for QSO 1phot.fluxfloate_logSED1[0.02/0.3] Dispersion in logSED1stat.errorfloatlogSED2[-2.7/0.6] Log scaled F_{nu}_ for QSO 2phot.fluxfloate_logSED2[0.03/0.4] Dispersion in logSED2stat.errorfloat