J/A+A/553/A107ivo://CDS.VizieR/J/A+A/553/A107doi:10.26093/cds/vizier.35530107CDSChen X.Rachen J.P.Lopez-Caniego M.Dickinson C.Pearson T.J.,Fuhrmann L.Krichbaum T.P.Partridge B.2017-09-20T05:13:37Z2013-05-16T08:34:33ZCDS support team

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

cds-question@unistra.frradio-sourcesradio-continuum-emissionbl-lacertae-objectsradio-galaxiesCombining measurements taken using the Wilkinson Microwave Anisotropy Probe (WMAP) from 2001 to 2008 with measurements taken using Planck from 2009 to 2010, we investigate the long-term flux density variability of extragalactic radio sources selected from the Planck Early Release Compact Source Catalogue. The single-year, single-frequency WMAP maps are used to estimate yearly-averaged flux densities of the sources in the four WMAP bands: Ka (33GHz), Q (41GHz), V (61GHz), and W (94GHz). We identify 82, 67, 32, and 15 sources respectively as variable at greater than 99% confidence level in these four bands. The amplitudes of variation are comparable between bands, and are not correlated with either the flux densities or the spectral indices of the sources. The number counts of WMAP Ka-band sources are stable from year to year despite the fluctuation caused by individual source variability. Most of our sources show strong correlation in variability between bands. Almost all the sources that show variability are blazars. We have attempted to fit two simple, four-parameter models to the time-series of 32 sources showing correlated variability at multiple frequencies - a long-term flaring model and a rotating-jet model. We find that 19 sources (60%) can be fit with the simple rotating-jet model, and ten of these also fit the simple long-term flaring model. The remaining 13 sources (40%) show more complex variability behaviour that is not consistent with either model. Extended radio galaxies in our sample show no sign of variability, as expected, with the exception of Pictor A for which we report evidence for a millimetre flare lasting between 2002 and 2010.2013A&A...553A.107Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/553/A107CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/88 : Planck Early Release Compact Source Catalogue (Planck, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/553/A107https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/553/A107http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/553/A107https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/553/A107https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/553/A107http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/553/A107GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/553/A107/table2 (Flux densities at WMAP Ka, Q, V, and W band for the 198 extragalactic radio sources selected from the Planck Early Release Compact Source Catalogue (ERCSC))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/553/A107/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/553/A107/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/553/A107/table2?GETtext/xml+votable180.050000true1.55233-6.38410.0055555555555555566/18 180 579 911 1154 1263 1546 1701 2143 2836 3096 3366 3675 3886 4285 4695 4820 5448 5458 5546 5597 5693 5767 5817 6368 6496 6507 6853 7606 7623 7642 7896 7911 7969 8858 9442 9460 9545 9633 9676 9723 9998 10163 10422 11408 11430 11631 11640 11715 12241 12475 12580 12619 13320 13410 13496 13582 13927 14744 14842 15023 15067 15286 15936 15947 16027 16049 16059 16093 16170 16281 16298 17184 17351 17414 17927 18035 18378 18506 18624 18661 19088 19101 19190 19398 19567 20099 20725 20781 20888 20935 21121 21266 21358 21758 21768 22363 22396 23099 23121 23323 23416 23882 24084 24571 25196 25302 25630 26131 26292 27060 27310 27714 27765 28479 28673 29016 29072 29218 29570 29675 31080 31399 31430 31451 31559 31664 31894 32841 32961 33549 33684 33825 33827 33862 33881 34013 34104 34123 34210 34264 34428 34461 34517 34572 34675 34870 35079 35440 35801 36941 37190 37203 37385 37474 37686 38277 38763 38916 38954 39489 39974 40060 40344 41072 41310 41335 41460 41942 42046 42901 43262 43281 43366 44069 44170 44247 44908 45178 45446 45648 46055 46214 46310 46337 46373 46964 47106 47540 47747 48023 48123 48320 48496 48595 48798 48965 49071https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/553/A107?format=asciiRadiodefaultJ/A+A/553/A107/table2Flux densities at WMAP Ka, Q, V, and W band for the 198 extragalactic radio sources selected from the Planck Early Release Compact Source Catalogue (ERCSC)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJNameJ2000 name of the sourcemeta.id;meta.maincharONameCommonly known name or B1950 namemeta.idcharGLONGalactic longitude (J2000)degpos.galactic.lonGLATGalactic latitude (J2000)degpos.galactic.latTypeObject type if known: AGN, BLL, GAL, SBG (star burst galaxy) or FSRQ (Flat Radio Spectrum QSO)src.classcharBandWMAP frequency band (Ka, Q, V or W) (1)instr.bandpasscharFreqFrequency of bandGHzem.freqintWMAP1Flux density measured on WMAP first year mapJyphot.flux.density;em.radiofloate_WMAP1Uncertainty on WMAP1 flux densityJystat.errorfloatWMAP2Flux density measured on WMAP second year mapJyphot.flux.density;em.radiofloate_WMAP2Uncertainty on WMAP2 flux densityJystat.errorfloatWMAP3Flux density measured on WMAP third year mapJyphot.flux.density;em.radiofloate_WMAP3Uncertainty on WMAP3 flux densityJystat.errorfloatWMAP4Flux density measured on WMAP fourth year mapJyphot.flux.density;em.radiofloate_WMAP4Uncertainty on WMAP4 flux densityJystat.errorfloatWMAP5Flux density measured on WMAP fifth year mapJyphot.flux.density;em.radiofloate_WMAP5Uncertainty on WMAP5 flux densityJystat.errorfloatWMAP6Flux density measured on WMAP sixth year mapJyphot.flux.density;em.radiofloate_WMAP6Uncertainty on WMAP6 flux densityJystat.errorfloatWMAP7Flux density measured on WMAP seventh year mapJyphot.flux.density;em.radiofloate_WMAP7Uncertainty on WMAP7 flux densityJystat.errorfloatERCSCPlanck ERCSC flux density (2)Jyphot.flux.density;em.radiofloate_ERCSCUncertainty on ERCSC flux densityJystat.errorfloatVrms? Variability index (3)meta.code;src.var.indexfloatnullableV[Vv] Strongly (V) or moderately (v) variable (4)meta.code;src.varcharERCDisplay the Planck Early Release Compact Source Catalogue data (Planck, 2011, Cat. VIII/88)meta.ref.urlcharSimbadNameSimbad column added by the CDSmeta.idchar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)degpos.eq.decnullableindexed