J/ApJ/815/49ivo://CDS.VizieR/J/ApJ/815/49doi:10.26093/cds/vizier.18150049CDSAnderson C.S.Gaensler B.M.Feain I.J.Franzen T.M.O.2017-11-28T12:21:08Z2017-10-26T08:50:59ZCDS support team

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

cds-question@unistra.frradio-sourcesmagnetic-fieldsredshiftedsurveysWe present a broadband spectropolarimetric survey of 563 discrete, mostly unresolved radio sources between 1.3 and 2.0 GHz using data taken with the Australia Telescope Compact Array. We have used rotation-measure synthesis to identify Faraday-complex polarized sources, those objects whose frequency-dependent polarization behavior indicates the presence of material possessing complicated magnetoionic structure along the line of sight (LOS). For sources classified as Faraday-complex, we have analyzed a number of their radio and multiwavelength properties to determine whether they differ from Faraday-simple polarized sources (sources for which LOS magnetoionic structures are comparatively simple) in these properties. We use this information to constrain the physical nature of the magnetoionic structures responsible for generating the observed complexity. We detect Faraday complexity in 12% of polarized sources at ~1' resolution, but we demonstrate that underlying signal-to-noise limitations mean the true percentage is likely to be significantly higher in the polarized radio source population. We find that the properties of Faraday-complex objects are diverse, but that complexity is most often associated with depolarization of extended radio sources possessing a relatively steep total intensity spectrum. We find an association between Faraday complexity and LOS structure in the Galactic interstellar medium (ISM) and claim that a significant proportion of the Faraday complexity we observe may be generated at interfaces of the ISM associated with ionization fronts near neutral hydrogen structures. Galaxy cluster environments and internally generated Faraday complexity provide possible alternative explanations in some cases.2015ApJ...815...49Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/815/49CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/6 : Polarization of Extragalactic Radio SourcesJ/MNRAS/190/205 : Magnetic fields in extragalactic radio sourcesJ/ApJS/45/97 : Extragal. Radio Sources Faraday RotationJ/ApJ/586/826 : Chandra X-ray observations of NGC 1316 (Kim+, 2003)J/MNRAS/362/9 : Radio-loud AGN in SDSS (Best+, 2005)J/ApJ/663/258 : Rotation measures of extragalactic sources in SGPSJ/ApJ/702/1230 : Rotation measure image of the sky (Taylor+, 2009)J/AJ/144/105 : MOJAVE. VIII. Faraday rotation in AGN jets. (Hovatta+, 2012)J/MNRAS/469/4034 : Broadband polarisation of radio AGN (O'Sullivan+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/815/49https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/815/49http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/815/49https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/815/49https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/815/49http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/815/49GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/815/49/table1 (Selected Quantities Calculated or Determined for Polarized Sources in Our Sample. (from erratum ApJ, 820, 144))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/815/49/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/815/49/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/815/49/table1?GETtext/xml+votable180.050000true50.025625-36.34560280.0055555555555555564/2158 5/8965 8976 6/34483 34485 34486 34487 34489 34491 34495 34505 34506 34507 34508 34510 34546 34552 35869 35908 35912https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/815/49?format=asciiRadioOpticaldefaultJ/ApJ/815/49/table1Selected Quantities Calculated or Determined for Polarized Sources in Our Sample. (from erratum ApJ, 820, 144)e_alphal0Uncertainty in alphal0stat.errorfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource name (HHMMSS+DDMMSS)meta.id;meta.maincharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainSepAngular separation from the position of the source nearest mosaic pointing centerdegpos.angDistancefloatPA[] Position angle from the position of the source nearest mosaic pointing centerdegpos.posAngfloatRes[ru] Resolved (r) or unresolved (u) source at the 90"x45" resolution of spectropolarimetric imagesmeta.codecharlambda0Reference wavelength to 3 significant figuresmem.wlfloatIlambda0Interpolated value of Stokes I at {lambda}_0_Jyphot.flux.density;em.opt.Ifloate_Ilambda0Uncertainty in Ilambda0Jystat.errorfloatalphal0Value of {alpha} evaluated at {lambda}_0_ (1)spect.indexfloatCat[cs] Complexity categorization of the source (2)meta.codecharGES[6/10]? The highest RMCLEAN cutoff Gaussian-equivalent significance (GES) level at which the source appears complex, in equivalent Gaussian {sigma}stat.fit.goodnessintnullableWeight[cn-] The weighting scheme under which a complex source attains its highest value of {sigma}_{Phi}_ (3)meta.codecharsigmaPhiCalculated value of the dispersion of the RMCLEAN model components, {sigma}_{Phi}_rad.m**-2phys.polarization.rotMeasurefloatpcutThe RMCLEAN cutoff value to 3 significant figuresrad.m**-2.beam**-1phys.polarization.rotMeasurefloatpAmplitude of the Faraday Dispersion Spectrum (FDS) at {Phi}_peak_rad.m**-2.beam**-1src.var.amplitudedoublee_pUncertainty in prad.m**-2.beam**-1stat.errorfloatpoffThe fractional contribution of off-peak RMCLEAN components to the total polarized flux (4)rad.m**-2.beam**-1phys.polarization.rotMeasurefloatPhipeakFaraday depth at which the FDS is maximumrad.m**-2phys.absorption.opticalDepthfloate_PhipeakUncertainty in Phipeakrad.m**-2stat.errorfloatMorphStokes I morphology of the radio source at 15" resolution (5)meta.notecharIRc[yes-no off] Counterpart status of a source in IR (6)meta.codecharOc[yes-no off] Counterpart status of a source in optical (6)meta.codecharUVc[yes-no off] Counterpart status of a source in UV (6)meta.codecharXc[yes-no ] Counterpart status of a source in X-rays (7)meta.codecharz? Cross-matched redshiftsrc.redshiftfloatnullable