J/MNRAS/428/1845ivo://CDS.VizieR/J/MNRAS/428/1845doi:10.26093/cds/vizier.74281845CDSBonaldi A.Bonavera L.Massardi M.De Zotti G.2024-07-20T20:13:15Z2014-02-18T15:52:15ZCDS support team

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

cds-question@unistra.frradio-galaxiesactive-galactic-nucleiThe Planck Australia Telescope Compact Array (Planck-ATCA) Co-eval Observations (PACO) have provided multi-frequency (5-40GHz) flux density measurements of complete samples of Australia Telescope 20GHz (AT20G) radio sources at frequencies below and overlapping with Planck frequency bands, almost simultaneously with Planck observations. In this work we analyse the data in total intensity for the spectrally selected PACO sample, a complete sample of 69 sources brighter than S20GHz=200mJy selected from the AT20G survey catalogue to be inverted or upturning between 5 and 20GHz. We study the spectral behaviour and variability of the sample. We use the variability between AT20G (2004-2007) and PACO (2009-2010) epochs to discriminate between candidate High-Frequency Peakers (HFPs) and candidate blazars. The HFPs picked up by our selection criteria have spectral peaks >10GHz in the observer frame and turn out to be rare (<0.5% of the S20GHz>=200mJy sources), consistent with the short duration of this phase implied by the "youth" scenario. Most (=~89%) of blazar candidates have remarkably smooth spectra, well described by a double power law, suggesting that the emission in the PACO frequency range is dominated by a single emitting region. Sources with peaked PACO spectra show a decrease of the peak frequency with time at a mean rate of -3+/-2GHz/yr on an average time-scale of <{tau}>=2.1+/-0.5yr (median: {tau}median=1.3yr). The 5-20GHz spectral indices show a systematic decrease from AT20G to PACO. At higher frequencies spectral indices steepen: the median {alpha}4030 is steeper than the median {alpha}205 by {delta}{alpha}=0.6. Taking further into account the Wide-field Infrared Survey Explorer data we find that the Spectral Energy Distributions (SEDs), {nu}S({nu}), of most of our blazars peak at {nu}SEDp<105GHz; the median peak wavelength is {lambda}SEDp=~93{mu}m. Only six have {nu}SEDp>105GHz.2013MNRAS.428.1845Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/428/1845CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/415/1597 : PACO catalogue of bright sources (Massardi+, 2011)J/MNRAS/402/2403 : Australia Telescope 20GHz Survey Catalog, AT20Ghttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/428/1845https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/428/1845http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/428/1845https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/428/1845https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/428/1845http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/428/1845GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/428/1845/catalog (Planck-ATCA Co-eval Observations (PACO) spectrally selected sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/428/1845/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/428/1845/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/428/1845/catalog?GETtext/xml+votable180.050000true6.5682839-35.21345890.005555555555555556Cone search capability for table J/MNRAS/428/1845/table3 (Blazar candidates in our sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/428/1845/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/428/1845/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/428/1845/table3?GETtext/xml+votable180.050000true6.56828-35.21350.0055555555555555566/16676 17052 24903 24931 29714 32910 33081 33217 33712 33881 34013 34026 34168 34227 34517 34938 35093 35254 35318 35440 35562 35875 36168 37190 37285 37438 37450 37675 38015 38184 38663 39004 39194 39307 39489 40217 40344 40496 40570 41043 41051 41110 41613 41938 42664 42762 42793 42824 43085 43122 43956 43995 44091 44155 44310 44441 45216 45235 45286 45567 45582 45665 46109 46226 46921 47237 47847 48187 488463.135456037257467e-24 2.6350554498480032e-23https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/428/1845?format=asciiRadiodefaultJ/MNRAS/428/1845/catalogPlanck-ATCA Co-eval Observations (PACO) spectrally selected samplee_S33256? rms uncertainty on S33256mJystat.errorfloatnullablefh[hb] h for High-Frequency Peakers (HFP) candidates, b for blazar candidatesmeta.notecharl_S4732Limit flag on S4732meta.code.errorcharS4732? Flux at PACO 4732MHz frequencymJyphot.flux.density;em.radio.3-6GHzintnullablee_S4732? rms uncertainty on S4732mJystat.errorfloatnullablel_S5244Limit flag on S5244meta.code.errorcharS5244? Flux at PACO 5244MHz frequencymJyphot.flux.density;em.radio.3-6GHzintnullablee_S5244? rms uncertainty on S5244mJystat.errorfloatnullablel_S5756Limit flag on S5756meta.code.errorcharS5756? Flux at PACO 5756MHz frequencymJyphot.flux.density;em.radio.3-6GHzintnullablee_S5756? rms uncertainty on S5756mJystat.errorfloatnullablel_S6268Limit flag on S6268meta.code.errorcharS6268? Flux at PACO 6268MHz frequencymJyphot.flux.density;em.radio.6-12GHzintnullablee_S6268? rms uncertainty on S6268mJystat.errorfloatnullablel_S8232Limit flag on SS8232meta.code.errorchare_S32744? rms uncertainty on S32744mJystat.errorfloatnullablel_S33256Limit flag on S33256meta.code.errorcharS33256? Flux at PACO 33256MHz frequencymJyphot.flux.density;em.mm.30-50GHzintnullablel_S33768Limit flag on S33768meta.code.errorcharl_S9768Limit flag on S9768meta.code.errorcharl_S39256Limit flag on S39256meta.code.errorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAT20GAT20G name (JHHMMSS+DDMMSS)meta.id;meta.maincharprimaryNNumber of observations of this sourcemeta.numberintnullableRAJ2000Right ascension in decimal hours (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainDateObservation datetime.epoch;obsnullablefs[s-] Flag "s" to identify epochs within 10-days from Planck observationsmeta.notecharfe[e-] Flag "e" for extended sourcesmeta.notecharSEDSimbad column added by the CDSmeta.ref.urlcharBlSimbad column added by the CDSmeta.ref.urlcharS8232? Flux at PACO 8232MHz frequencymJyphot.flux.density;em.radio.6-12GHzintnullablee_S8232? rms uncertainty on S8232mJystat.errorfloatnullablel_S8744Limit flag on S8744meta.code.errorcharS8744? Flux at PACO 8744MHz frequencymJyphot.flux.density;em.radio.6-12GHzintnullablee_S8744? rms uncertainty on S8744mJystat.errorfloatnullablel_S9256Limit flag on S9256meta.code.errorcharS9256? Flux at PACO 9256MHz frequencymJyphot.flux.density;em.radio.6-12GHzintnullablee_S9256? rms uncertainty on S9256mJystat.errorfloatnullableS9768? Flux at PACO 9768MHz frequencymJyphot.flux.density;em.radio.6-12GHzintnullablee_S9768? rms uncertainty on S9768mJystat.errorfloatnullablel_S17232Limit flag on S17232meta.code.errorcharS17232? Flux at PACO 17232MHz frequencymJyphot.flux.density;em.radio.12-30GHzintnullablee_S17232? rms uncertainty on S17232mJystat.errorfloatnullablel_S17744Limit flag on S17744meta.code.errorcharS17744? Flux at PACO 17744MHz frequencymJyphot.flux.density;em.radio.12-30GHzintnullablee_S17744? rms uncertainty on S17744mJystat.errorfloatnullablel_S18256Limit flag on S18256meta.code.errorcharS18256? Flux at PACO 18256MHz frequencymJyphot.flux.density;em.radio.12-30GHzintnullablee_S18256? rms uncertainty on S18256mJystat.errorfloatnullablel_S18768Limit flag on S18768meta.code.errorcharS18768? Flux at PACO 18768MHz frequencymJyphot.flux.density;em.radio.12-30GHzintnullablee_S18768? rms uncertainty on S18768mJystat.errorfloatnullablel_S23232Limit flag on S23232meta.code.errorcharS23232? Flux at PACO 23232MHz frequencymJyphot.flux.density;em.radio.12-30GHzintnullablee_S23232? rms uncertainty on S23232mJystat.errorfloatnullablel_S23744Limit flag on S23744meta.code.errorcharS23744? Flux at PACO 23744MHz frequencymJyphot.flux.density;em.radio.12-30GHzintnullablee_S23744? rms uncertainty on S23744mJystat.errorfloatnullablel_S24256Limit flag on S24256meta.code.errorcharS24256? Flux at PACO 24256MHz frequencymJyphot.flux.density;em.radio.12-30GHzintnullablee_S24256? rms uncertainty on S24256mJystat.errorfloatnullablel_S24768Limit flag on S24768meta.code.errorcharS24768? Flux at PACO 24768MHz frequencymJyphot.flux.density;em.radio.12-30GHzintnullablee_S24768? rms uncertainty on S24768mJystat.errorfloatnullablel_S32232Limit flag on S32232meta.code.errorcharS32232? Flux at PACO 32232MHz frequencymJyphot.flux.density;em.mm.30-50GHzintnullablee_S32232? rms uncertainty on S32232mJystat.errorfloatnullablel_S32744Limit flag on S32744meta.code.errorcharS32744? Flux at PACO 32744MHz frequencymJyphot.flux.density;em.mm.30-50GHzintnullableS33768? Flux at PACO 33768MHz frequencymJyphot.flux.density;em.mm.30-50GHzintnullablee_S33768? rms uncertainty on S33768mJystat.errorfloatnullablel_S38232Limit flag on S38232meta.code.errorcharS38232? Flux at PACO 38232MHz frequencymJyphot.flux.density;em.mm.30-50GHzintnullablee_S38232? rms uncertainty on S38232mJystat.errorfloatnullablel_S38744Limit flag on S38744meta.code.errorcharS38744? Flux at PACO 38744MHz frequencymJyphot.flux.density;em.mm.30-50GHzintnullablee_S38744? rms uncertainty on S38744mJystat.errorfloatnullableS39256? Flux at PACO 39256MHz frequencymJyphot.flux.density;em.mm.30-50GHzintnullablee_S39256? rms uncertainty on S39256mJystat.errorfloatnullablel_S39768Limit flag on S39768meta.code.errorcharS39768? Flux at PACO 39768MHz frequencymJyphot.flux.density;em.mm.30-50GHzintnullablee_S39768? rms uncertainty on S39768mJystat.errorfloatnullablea? Best fit parameter a (1)stat.param;meta.modelledfloatnullableb? Best fit parameter b (1)stat.param;meta.modelledfloatnullablenu0? Best fit parameter {nu}_0_ (1)GHzstat.fit.paramfloatnullableS0? Best fit parameter S_0_ (1)Jyphot.flux.density;meta.modelledfloatnullablechi2? {chi}^2^ of fit (1)stat.fit.chi2floatnullableJ/MNRAS/428/1845/table3Blazar candidates in our samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAT20GAT20G namemeta.id;meta.maincharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainBtypeBlazar type ("QSO RLoud" or "Uncertain") (1)meta.code.classcharz? Redshift (2)src.redshiftfloatnullableStypeSpectral type based on PACO data (complex, down-turning, flat, peaked, or self-absorbed; see Section 2.2)src.spTypecharnup? Peak frequency {nu}_p_GHzphot.fluxfloatnullablenup2? Peak frequency computed taking into account Planck/ERCSC dataGHzphot.fluxfloatnullablenum? Rest-frame peak frequency {nu}_m_GHzphot.fluxfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar