J/ApJ/716/530ivo://CDS.VizieR/J/ApJ/716/530doi:10.26093/cds/vizier.17160530CDSKozlowski S.Kochanek C.S.Stern D.Ashby M.L.N.Assef R.J.Bock J.J.,Borys C.Brand K.Brodwin M.Brown M.J.I.Cool R.Cooray A.Croft S.,Dey A.Eisenhardt P.R.Gonzalez A.Gorjian V.Griffith R.Grogin N.,Ivison R.Jacob J.Jannuzi B.T.Mainzer A.Moustakas L.Rottgering H.,Seymour N.Smith H.A.Stanford S.A.Stauffer J.R.Sullivan I.S.,van Breugel W.Willner S.P.Wright E.L.2017-06-26T11:50:33Z2011-10-04T13:21:14ZCDS support team

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

cds-question@unistra.frinfrared-photometrysurveysactive-galactic-nucleiWe use the multi-epoch, mid-infrared Spitzer Deep Wide-Field Survey (SDWFS; Ashby et al. 2009, Cat. J/ApJ/701/428) to investigate the variability of objects in 8.1deg^2^ of the NOAO Deep Wide Field Survey Bootes field (NDWFS; Jannuzi & Dey 1999ASPC..191..111J). We perform a Difference Image Analysis of the four available epochs between 2004 and 2008, focusing on the deeper 3.6 and 4.5um bands. Out of 474, 179 analyzed sources, 1.1% meet our standard variability selection criteria that the two light curves are strongly correlated (r>0.8) and that their joint variance ({sigma}_12_) exceeds that for all sources with the same magnitude by 2{sigma}. We then examine the mid-IR colors of the variable sources and match them with X-ray sources from the XBootes survey (Murray et al. 2005ApJS..161....1M), radio catalogs (FIRST (Becker et al., Cat. VIII/71) and WSRT (de Vries et al. 2002, Cat. J/AJ/123/1784)), 24um selected active galactic nucleus (AGN) candidates (see Houck et al. 2005ApJ...622L.105H), and spectroscopically identified AGNs from the AGN and Galaxy Evolution Survey (AGES; C. S. Kochanek et al. 2010, in prep). Based on their mid-IR colors, most of the variable sources are AGNs (76%), with smaller contributions from stars (11%), galaxies (6%), and unclassified objects, although most of the stellar, galaxy, and unclassified sources are false positives. For our standard selection criteria, 11%-12% of the mid-IR counterparts to X-ray sources, 24um AGN candidates, and spectroscopically identified AGNs show variability.2010ApJ...716..530Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/716/530CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/71 : The FIRST Survey Catalog, Version 03Apr11 (Becker+ 2003)J/ApJ/701/428 : The Spitzer Deep, Wide-Field Survey (SDWFS) (Ashby+, 2009)J/ApJ/641/140 : Optical counterparts in the NDWFS Bootes field (Brand+, 2006)J/ApJS/161/9 : X-ray survey of the NDWFS Bootes field (Kenter+, 2005)J/ApJ/634/L1 : 16{mu}m sources in the NOAO Bootes field (Kasliwal+, 2005)J/AJ/123/1784 : 1.4 GHz imaging of the Bootes field (de Vries+, 2002)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/716/530https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/716/530http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/716/530https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/716/530https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/716/530http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/716/530GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/716/530/catalog (SDWFS-DIA (Spitzer Deep Wide Field Survey - Difference Image Analysis) variability catalog and light curves)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/716/530/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/716/530/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/716/530/catalog?GETtext/xml+votable180.050000true218.515446933.04489310.0055555555555555565/2286 2287 2628 2629 6/9135 9194 10501 10521 10524 105602.0616683193919197e-20 6.185923063528282e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/716/530?format=asciiInfrareddefaultJ/ApJ/716/530/catalogSDWFS-DIA (Spitzer Deep Wide Field Survey - Difference Image Analysis) variability catalog and light curvesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDWFSObject name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainindexedDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainindexed[3.6]Spitzer/IRAC 3.6 micron band magnitude (1)magphot.mag;em.IR.3-4umfloate_[3.6]The 1{sigma} error in 3.6magmagstat.errorfloat[4.5]Spitzer/IRAC 4.5 micron band magnitude (1)magphot.mag;em.IR.4-8umfloate_[4.5]The 1{sigma} error in 4.5magmagstat.errorfloat[5.8]? Spitzer/IRAC 5.8 micron band magnitude (1)magphot.flux.density;em.IR.4-8umfloatnullablee_[5.8]? The 1{sigma} error in 5.8magmagstat.errorfloatnullable[8.0]? Spitzer/IRAC 8.0 micron band magnitude (1)magphot.flux.density;em.IR.8-15umfloatnullablee_[8.0]? The 1{sigma} error in 8.0magmagstat.errorfloatnullableNe1[0,4] Number of epochs used in channel 1meta.numberintnu1? Channel 1 dispersionmagstat.variancefloatnullableSig1? Channel 1 variability significance (2)stat.fit.goodness;src.varfloatnullableNe2[0,4] Number of epochs used in channel 2meta.numberintnu2? Channel 2 dispersionmagstat.variancefloatnullableSig2? Channel 2 variability significance (2)stat.fit.goodness;src.varfloatnullableNe[0,4] Common number of available epochsmeta.numberintnu3.6? Dispersion in channel 1 for common number of epochsmagstat.variancefloatnullablenu4.5? Dispersion in channel 2 for common number of epochsmagstat.variancefloatnullableC12? Covariance between channels 1 and 2mag**2stat.covariancefloatnullabler? Correlation between channels 1 and 2stat.correlationfloatnullableSig12? joint significance in channels 1 and 2stat.fit.goodnessfloatnullablemask[0/1] Mask code for neighbour bright star (3)meta.codeint[3.6]1? Epoch 1 Spitzer/IRAC 3.6 micron band magmagphot.mag;em.IR.3-4umfloatnullable[3.6]2? Epoch 2 Spitzer/IRAC 3.6 micron band magmagphot.mag;em.IR.3-4umfloatnullable[3.6]3? Epoch 3 Spitzer/IRAC 3.6 micron band magmagphot.mag;em.IR.3-4umfloatnullable[3.6]4? Epoch 4 Spitzer/IRAC 3.6 micron band magmagphot.mag;em.IR.3-4umfloatnullable[4.5]1? Epoch 1 Spitzer/IRAC 4.5 micron band magmagphot.mag;em.IR.4-8umfloatnullable[4.5]2? Epoch 2 Spitzer/IRAC 4.5 micron band magmagphot.mag;em.IR.4-8umfloatnullable[4.5]3? Epoch 3 Spitzer/IRAC 4.5 micron band magmagphot.mag;em.IR.4-8umfloatnullable[4.5]4? Epoch 4 Spitzer/IRAC 4.5 micron band magmagphot.mag;em.IR.4-8umfloatnullable