J/MNRAS/446/3199ivo://CDS.VizieR/J/MNRAS/446/3199doi:10.26093/cds/vizier.74463199CDSGarcia-Gonzalez J.Alonso-Herrero A.Perez-Gonzalez P.G.,Hernan-Caballero A.Sarajedini V.L.Villar V.2024-08-14T20:19:02Z2015-11-09T13:31:25ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleigalaxiesinfrared-sourcesinfrared-photometryWe present a study of galaxies showing mid-infrared variability in data taken in the deepest Spitzer/MIPS 24{mu}m surveys in the Great Observatory Origins Deep Survey South field. We divide the data set in epochs and subepochs to study the long-term (months-years) and the short-term (days) variability. We use a {chi}^2^-statistics method to select active galactic nucleus (AGN) candidates with a probability <=1% that the observed variability is due to statistical errors alone. We find 39 (1.7% of the parent sample) sources that show long-term variability and 55 (2.2% of the parent sample) showing short-term variability. That is, 0.03sources/arcmin^2^ for both, long-term and short-term variable sources. After removing the expected number of false positives inherent to the method, the estimated percentages are 1.0 and 1.4% of the parent sample for the long term and short term, respectively. We compare our candidates with AGN selected in the X-ray and radio bands, and AGN candidates selected by their IR emission. Approximately, 50% of the MIPS (Multiband Imaging Photometer for Spitzer) 24{mu}m variable sources would be identified as AGN with these other methods. Therefore, MIPS 24{mu}m variability is a new method to identify AGN candidates, possibly dust obscured and low-luminosity AGN, that might be missed by other methods. However, the contribution of the MIPS 24{mu}m variable identified AGN to the general AGN population is small (<=13%) in GOODS-South.2015MNRAS.446.3199Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/446/3199CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/428/1043 : Redshifts from VIMOS VLT Deep Survey (Le Fevre+, 2004)J/A+A/437/883 : K20 survey: spectroscopic catalogue (Mignoli+, 2005)J/A+A/449/951 : GOODS-MUSIC sample: multicolour catalog (Grazian+, 2006)J/ApJS/179/95 : VLA survey of CDF-S. II. (Mainieri+, 2008)J/A+A/512/A12 : VLT/VIMOS spectroscopy in GOODS-South field (Balestra+, 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/446/3199https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/446/3199http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/446/3199https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/446/3199https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/446/3199http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/446/3199GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/446/3199/tabled1 (Catalogue of the long-term variable candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/446/3199/tabled1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/446/3199/tabled1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/446/3199/tabled1?GETtext/xml+votable180.050000true52.8655903-27.53295910.005555555555555556Cone search capability for table J/MNRAS/446/3199/tablee1 (Catalogue of the short-term variable candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/446/3199/tablee1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/446/3199/tablee1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/446/3199/tablee1?GETtext/xml+votable180.050000true52.7297992-27.57392810.0055555555555555566/35935 359576.772611666688002e-21 1.000830682546041e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/446/3199?format=asciiInfrareddefaultJ/MNRAS/446/3199/tabled1Catalogue of the long-term variable candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentification numbermeta.id;meta.mainintf_ID[*] *: in the E-CDFSmeta.codecharn_ID[a,b ] Note (G1)meta.notecharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainFlux1Spitzer/MIPS 24um Flux [epoch 1]uJyphot.flux.density;em.IR.15-30uminte_Flux1rms uncertainty on Flux1uJystat.errorintFlux3Spitzer/MIPS 24um Flux [epoch 3]uJyphot.flux.density;em.IR.15-30uminte_Flux3rms uncertainty on Flux3uJystat.errorintFlux6Spitzer/MIPS 24um Flux [epoch 6]uJyphot.flux.density;em.IR.15-30uminte_Flux6rms uncertainty on Flux6uJystat.errorintFlux7Spitzer/MIPS 24um Flux [epoch 7]uJyphot.flux.density;em.IR.15-30uminte_Flux7rms uncertainty on Flux7uJystat.errorint<Flux>Mean 24um fluxuJyphot.flux.density;em.IR.15-30umintchi2Chi^2^ valuestat.fit.chi2;stat.valuefloatVarMeasure of the variability (Var=[(Fmax-Fmin)/<F>]*100)%phot.flux;arith.ratiofloatRmaxMaximum to minimum flux ratio (Dmax/Fmin)phot.flux;arith.ratiofloatzph? Photometric redshiftsrc.redshiftfloatnullablezsp? Spectrocopic redshift (G2)src.redshiftfloatnullableR? COMBO-17 R magnitudephot.mag;em.opt.RfloatnullableXray?[YES NO] Detected in X-ray ?meta.codecharRadio?[YES NO] Detected in radio ?meta.codecharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/MNRAS/446/3199/tablee1Catalogue of the short-term variable candidatesf_ID[*] *: in the E-CDFSmeta.codecharn_ID[a,b ] Note (G1)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentification numbermeta.id;meta.mainintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainFlux7aSpitzer/MIPS 24um Flux [epoch 7a]uJyphot.flux.density;em.IR.15-30uminte_Flux7arms uncertainty on Flux7auJystat.errorintFlux7bSpitzer/MIPS 24um Flux [epoch 7b]uJyphot.flux.density;em.IR.15-30uminte_Flux7brms uncertainty on Flux7buJystat.errorintFlux7Spitzer/MIPS 24um Flux [epoch 7]uJyphot.flux.density;em.IR.15-30uminte_Flux7rms uncertainty on Flux7uJystat.errorint<Flux>Mean 24um fluxuJyphot.flux.density;em.IR.15-30umintchi2Chi^2^ valuestat.fit.chi2;stat.valuefloatVarMeasure of the variability (Var=[(Fmax-Fmin)/<F>]*100)%phot.flux;arith.ratiofloatRmaxMaximum to minimum flux ratio (Dmax/Fmin)phot.flux;arith.ratiofloatzph? Photometric redshiftsrc.redshiftfloatnullablezsp? Spectrocopic redshift (G2)src.redshiftfloatnullableR? COMBO-17 R magnitudephot.mag;em.opt.RfloatnullableXray?[YES NO] Detected in X-ray ?meta.codecharRadio?[YES NO] Detected in radio ?meta.codecharSimbadSimbad column added by the CDSmeta.ref.urlchar