J/MNRAS/436/2915ivo://CDS.VizieR/J/MNRAS/436/2915doi:10.26093/cds/vizier.74362915CDSMassardi M.Burke-Spolaor S.G.Murphy T.Ricci R.Lopez-Caniego M.,Negrello M.Chhetri R.De Zotti G.Ekers R.D.Partridge R.B.,Sadler E.M.2024-08-07T20:12:00Z2014-12-02T14:08:55ZCDS support team

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

cds-question@unistra.frradio-galaxiespolarimetryWe present polarization data for 180 extragalactic sources extracted from the Australia Telescope 20GHz (AT20G) survey catalogue and observed with the Australia Telescope Compact Array during a dedicated, high sensitivity run ({sigma}_P_~1mJy). For the sake of completeness, we extracted the polarization information for seven extended sources from the 9yr Wilkinson Microwave Anisotropy Probe co-added maps at 23GHz. The full sample of 187 sources constitutes a =~99% complete sample of extragalactic sources brighter than S_20GHz_=500mJy at the selection epoch with declination {delta}<-30{deg}. The sample has a 91.4% detection rate in polarization at ~20GHz (94 percent if considering the subsample of point-like sources). We have measurements also at 4.8 and 8.6GHz within ~1 month of the 20GHz observations for 172 sources to reconstruct the spectral properties of the sample in total intensity and in polarization: 143 of them have a polarization detection at all three frequencies. We find that there is no statistically significant evidence of a relationship either between the fraction of polarization and frequency or between the fraction of polarization and the total intensity flux density. This indicates that Faraday depolarization is not very important above 4.8GHz and that the magnetic field is not substantially more ordered in the regions dominating the emission at higher frequencies (up to 20GHz). We estimate the distribution of the polarization fraction and the polarized flux density source counts at ~20GHz.2013MNRAS.436.2915Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/436/2915CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/402/2403 : Australia Telescope 20GHz Survey Catalog (Murphy+, 2010)J/MNRAS/417/2651 : AT20G-optical catalogue (Mahony+, 2011)J/MNRAS/434/956 : AT20G high-angular-resolution catalogue (Chhetri+, 2013)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/436/2915https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/436/2915http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/436/2915https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/436/2915https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/436/2915http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/436/2915GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/436/2915/table2 (Catalogue of the sources of the extragalactic sample observed in the AT20G run dedicated to high sensitivity polarization)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/436/2915/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/436/2915/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/436/2915/table2?GETtext/xml+votable180.050000true1.148565-47.6054460.0055555555555555566/16444 16483 20483 20610 24608 24615 28673 32892 32961 33406 33471 33549 33560 33570 33684 33703 33816 33825 33827 33829 33862 33881 34013 34038 34104 34117 34123 34210 34264 34428 34461 34493 34517 34534 34571-34572 34691 34870-34871 34931 34938 35079 35093 35141 35294 35318 35370 35432 35440 35501 35562 35590 35608 36928 37190-37191 37203 37217 37238 37246 37269 37311 37368 37385 37438 37474 37675 37686 37779 37819 37919 37942 37994 38039 38046 38128 38189 38277 38279 38416 38474 38579 38663 38787 38800 38916 38993 39181 39298 39489 39592 39658 39752 39848 39974 40066 40990 41059 41072 41088 41275 41310 41325 41335 41423 41460 41464 41511 41543 41618-41619 41623 41665 41701 41938 41942 42046 42188 42249 42366 42411 42471 42481-42482 42492 42515 42571 42825 43122 43262 43281 43366 43549 43566 43578 43822 43828 43936 44043 44170 45110 45162 45164 45178 45196 45446 45567 45614 45621 45713 45763 45795 46055 46101 46174 46204 46214 46226 46251 46310 46337 46373 46568 46588 46721 46764 46782 46851 46868 46921 47106-47107 47112 47151 47154 47187 47268 47375 47534 47540 47585 47747 47805 47943 481423.180513520130092e-24 1.1926925226554418e-23https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/436/2915?format=asciiRadiodefaultJ/MNRAS/436/2915/table2Catalogue of the sources of the extragalactic sample observed in the AT20G run dedicated to high sensitivity polarizationrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAT20GAT20G name (JHHMMSS+DDMMSS), or Fornax Ameta.id;meta.maincharf_AT20GFlags on source (1)meta.codecharS(18)18GHz scalar average flux densitymJyphot.flux.density;em.radio.12-30GHzfloate_S(18)rms uncertainty on S(18G)mJystat.errorfloatl_P(18)[<] Limit flag on P(18G)meta.code.errorcharP(18)Polarised flux density at 18GHzmJyphot.flux.density;em.radio.12-30GHzfloate_P(18)? rms uncertainty on P(18G)mJystat.errorfloatnullablem(18)? Fractional polarisation at 18GHz%phys.polarization.linearfloatnullablee_m(18)? rms uncertainty on m(18G)%stat.errorfloatnullablePA(18)[-90/90]? Polarisation angle at 18GHzdegpos.posAng;phys.polarizationfloatnullableS(8.6)? Total intensity flux density at 8.6GHzmJyphot.flux.density;em.radio.6-12GHzfloatnullablee_S(8.6)? rms uncertainty on S(8.6)mJystat.errorfloatnullablel_P(8.6)[<] Limit flag on P(8.6)meta.code.errorcharP(8.6)? Polarised flux density at 8.6GHzmJyphot.flux.density;em.radio.6-12GHzfloatnullablee_P(8.6)? rms uncertainty on P(8.6)mJystat.errorfloatnullablem(8.6)? Polarisation degree at 8.6GHz%phys.polarization.linearfloatnullablee_m(8.6)? rms uncertainty on m(8.6)%stat.errorfloatnullablePA(8.6)[-90/90]? Polarisation angle at 8.6GHzdegpos.posAng;phys.polarizationfloatnullableS(4.8)? Total intensity flux density at 4.8GHzmJyphot.flux.density;em.radio.3-6GHzfloatnullablee_S(4.8)? rms uncertainty on S(4.8)mJystat.errorfloatnullablel_P(4.8)[<] Limit flag on P(4.8)meta.code.errorcharP(4.8)? Polarised flux density at 4.8GHzmJyphot.flux.density;em.radio.3-6GHzfloatnullablee_P(4.8)? rms uncertainty on P(4.8)mJystat.errorfloatnullablem(4.8)? Polarisation degree at 4.8GHz%phys.polarization.linearfloatnullablee_m(4.8)? rms uncertainty on m(4.8)%stat.errorfloatnullablePA(4.8)[-90/90]? Polarisation angle at 4.8GHzdegpos.posAng;phys.polarizationfloatnullable6kmVis? Ratio between the visibilities amplitudes (2)stat.fit.paramfloatnullableSEDPlot the spectrum with SPECFIND (Vollmer et al. 2009, Cat. VIII/85)meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPosition from Simbad (right ascension part)degpos.eq.ra;meta.main_DEPosition from Simbad (declination part)degpos.eq.dec;meta.main