J/ApJ/817/119ivo://CDS.VizieR/J/ApJ/817/119doi:10.26093/cds/vizier.18170119CDSKozlowski S.Kochanek C.S.Ashby M.L.N.Assef R.J.Brodwin M.,Eisenhardt P.R.Jannuzi B.T.Stern D.2017-01-23T22:00:00Z2016-05-13T11:18:14ZCDS support team

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

cds-question@unistra.frquasarsinfrared-photometrysurveysactive-galactic-nucleiThe Decadal IRAC Bootes Survey is a mid-IR variability survey of the ~9deg^2^ of the NDWFS Bootes Field and extends the time baseline of its predecessor, the Spitzer Deep, Wide-Field Survey (SDWFS), from 4 to 10 years. The Spitzer Space Telescope visited the field five times between 2004 and 2014 at 3.6 and 4.5{mu}m. We provide the difference image analysis photometry for a half a million mostly extragalactic sources. In mid-IR color-color plane, sources with quasar colors constitute the largest variability class (75%), 16% of the variable objects have stellar colors and the remaining 9% have the colors of galaxies. Adding the fifth epoch doubles the number of variable active galactic nuclei (AGNs) for the same false positive rates as in SDWFS, or increases the number of sources by 20% while decreasing the false positive rates by factors of 2-3 for the same variability amplitude. We quantify the ensemble mid-IR variability of ~1500 spectroscopically confirmed AGNs using single power-law structure functions (SFs), which we find to be steeper (index {gamma}~0.45) than in the optical ({gamma}~0.3), leading to much lower amplitudes at short time-lags. This provides evidence for large emission regions, smoothing out any fast UV/optical variations, as the origin of infrared quasar variability. The mid-IR AGN SF slope {gamma} seems to be uncorrelated with both the luminosity and rest-frame wavelength, while the amplitude shows an anti-correlation with the luminosity and a correlation with the rest-frame wavelength.2016ApJ...817..119Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/817/119CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/453/1562 : CRTS close supermassive black hole binaries (Graham+, 2015)J/ApJ/806/128 : Space telescope RM project. I. NGC5548 (De Rosa+, 2015)J/ApJ/804/27 : NIR photometry of hot dust-obscured galaxies (Assef+, 2015)J/ApJ/801/127 : 3.6um, 4.5um, B & V light curves of NGC 6418 (Vazquez+, 2015)J/MNRAS/441/715 : Mid-infrared study of RR Lyrae stars (Gavrilchenko+, 2014)J/MNRAS/439/1648 : Subarcsecond mid-infrared atlas of local AGN (Asmus+, 2014)J/ApJ/772/26 : AGN with WISE. II. The NDWFS Bootes field (Assef+, 2013)J/ApJ/755/60 : Reverberation mapping for 5 Seyfert 1 galaxies (Grier+, 2012)J/ApJ/754/45 : IR properties of Swift/BAT X-ray AGNs (Ichikawa+, 2012)J/ApJS/200/8 : AGES: the AGN and Galaxy Evolution Survey (Kochanek+, 2012)J/ApJ/728/26 : QSO selection based on photom. variability (Macleod+, 2011)J/ApJ/717/1181 : Spitzer power-law galaxies in EGS (Park+, 2010)J/ApJ/716/530 : Mid-IR variability from the SDWFS (Kozlowski+, 2010)J/ApJ/713/970 : Low-resolution SED templates for AGNs & gal. (Assef+, 2010)J/ApJ/709/572 : COSMOS 70um sources (Kartaltepe+, 2010)J/ApJ/701/428 : The Spitzer Deep, Wide-Field Survey (SDWFS) (Ashby+, 2009)J/ApJ/698/895 : Variations in QSOs optical flux (Kelly+, 2009)J/ApJ/660/167 : Spitzer AGN candidates in CDFN (Donley+, 2007)J/ApJS/166/470 : SDSS-Spitzer type I QSOs IR photometry (Richards+, 2006)J/ApJ/641/140 : Optical counterparts in the NDWFS Bootes field (Brand+, 2006)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)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/817/119https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/817/119http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/817/119https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/817/119https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/817/119http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/817/119GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/817/119/table3 (Decadal IRAC Bootes Survey (DIBS) variability catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/817/119/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/817/119/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/817/119/table3?GETtext/xml+votable180.050000true217.9276130632.550738060.005555555555555556Cone search capability for table J/ApJ/817/119/table1 (The 3.6 micron light curves for the Decadal IRAC Bootes Survey (DIBS) variability catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/817/119/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/817/119/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/817/119/table1?GETtext/xml+votable180.050000true217.9276130632.550738060.005555555555555556Cone search capability for table J/ApJ/817/119/table2 (The 4.5 micron light curves for the Decadal IRAC Bootes Survey (DIBS) variability catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/817/119/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/817/119/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/817/119/table2?GETtext/xml+votable180.050000true217.9276130632.550738060.0055555555555555565/2286 2287 2628 2629 6/9135 9194 10501 10521 10524 105602.0616683193919197e-20 6.185923063528282e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/817/119?format=asciiInfrareddefaultJ/ApJ/817/119/table3Decadal IRAC Bootes Survey (DIBS) variability catalogmask[0/1]? Mask code (3)meta.codeintnullablePhotDisplay the 3.6 and 4.5um photometry data for this sourcemeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDIBSObject name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharprimaryRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainindexedDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainindexed3.6mag[9.2/19.8] Spitzer/IRAC 3.6um band magnitude (1)magphot.mag;em.IR.3-4umfloate_3.6mag[0/0.4] The 1{sigma} error in 3.6magmagstat.errorfloat4.5mag[8.3/25.9] Spitzer/IRAC 4.5um band magnitude (1)magphot.mag;em.IR.4-8umfloate_4.5mag[0/5.2] The 1{sigma} error in 4.5magmagstat.errorfloat5.8mag[5.9/22]? Spitzer/IRAC 5.8um band magnitude (1)magphot.flux.density;em.IR.4-8umfloatnullablee_5.8mag[0/5.2]? The 1{sigma} error in 5.8magmagstat.errorfloatnullable8.0mag[6.4/20.3]? Spitzer/IRAC 8.0um band magnitude (1)magphot.flux.density;em.IR.8-15umfloatnullablee_8.0mag[0/5.2]? The 1{sigma} error in 8.0magmagstat.errorfloatnullableNe1[0/5] Number of epochs used in channel 1meta.numberintnu1[0/3.5] Channel 1 dispersionmagstat.variancefloatSig1[-1.2/51.5] Channel 1 significance (2)stat.fit.goodnessfloatNe2[0/5] Number of epochs used in channel 2meta.numberintnu2[0/3] Channel 2 dispersionmagstat.variancefloatSig2[-2.2/60]? Channel 2 significance (2)stat.fit.goodnessfloatnullableNe[0/5] Common number of available epochsmeta.numberintnu3.6[0.001/4]? Dispersion in channel 1 for common number of epochsmagstat.variancefloatnullablenu4.5[0/3.6]? Dispersion in channel 2 for common number of epochsmagstat.variancefloatnullableC12[-3.6/2.2]? Covariance between channels 1 and 2mag**2stat.covariancefloatnullabler? Correlation between channels 1 and 2stat.correlationfloatnullableSig12[0.002/101]? joint significance in channels 1 and 2stat.fit.goodnessfloatnullableSDWFSDisplay the data from Kozlowski+, 2010, J/ApJ/716/530, within 0.5"meta.ref.urlintnullableJ/ApJ/817/119/table1The 3.6 micron light curves for the Decadal IRAC Bootes Survey (DIBS) variability catalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainindexedDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainindexed3.6mag1[10.9/20.5]? Epoch 1 Spitzer/IRAC 3.6um band magnitude (G1)magphot.mag;em.IR.3-4umfloatnullablee_3.6mag1? The Epoch 1 1{sigma} error in 3.6magmagstat.errorfloatnullable3.6mag2? Epoch 2 Spitzer/IRAC 3.6um band mag (G1)magphot.mag;em.IR.3-4umfloatnullablee_3.6mag2[0.01/0.6]? The Epoch 2 1{sigma} error in 3.6magmagstat.errorfloatnullable3.6mag3? Epoch 3 Spitzer/IRAC 3.6um band mag (G1)magphot.mag;em.IR.3-4umfloatnullablee_3.6mag3? The Epoch 3 1{sigma} error in 3.6magmagstat.errorfloatnullable3.6mag4? Epoch 4 Spitzer/IRAC 3.6um band mag (G1)magphot.mag;em.IR.3-4umfloatnullablee_3.6mag4? The Epoch 4 1{sigma} error in 3.6magmagstat.errorfloatnullable3.6mag5? Epoch 5 Spitzer/IRAC 3.6um band mag (G1)magphot.mag;em.IR.3-4umfloatnullablee_3.6mag5? The Epoch 5 1{sigma} error in 3.6magmagstat.errorfloatnullableJ/ApJ/817/119/table2The 4.5 micron light curves for the Decadal IRAC Bootes Survey (DIBS) variability catalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainindexedDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainindexed4.5mag1? Epoch 1 Spitzer/IRAC 4.5um band mag (G1)magphot.mag;em.IR.4-8umfloatnullablee_4.5mag1? The Epoch 1 1{sigma} error in 4.5magmagstat.errorfloatnullable4.5mag2? Epoch 2 Spitzer/IRAC 4.5um band mag (G1)magphot.mag;em.IR.4-8umfloatnullablee_4.5mag2[0.01/0.6]? The Epoch 2 1{sigma} error in 4.5magmagstat.errorfloatnullable4.5mag3? Epoch 3 Spitzer/IRAC 4.5um band mag (G1)magphot.mag;em.IR.4-8umfloatnullablee_4.5mag3? The Epoch 3 1{sigma} error in 4.5magmagstat.errorfloatnullable4.5mag4[10.5/20.5]? Epoch 4 Spitzer/IRAC 4.5um band magnitude (G1)magphot.mag;em.IR.4-8umfloatnullablee_4.5mag4? The Epoch 4 1{sigma} error in 4.5magmagstat.errorfloatnullable4.5mag5? Epoch 5 Spitzer/IRAC 4.5um band mag (G1)magphot.mag;em.IR.4-8umfloatnullablee_4.5mag5? The Epoch 5 1{sigma} error in 4.5magmagstat.errorfloatnullable