J/A+A/693/A100ivo://CDS.VizieR/J/A+A/693/A100doi:10.26093/cds/vizier.36930100CDSPiras S.Horellou C.Conway J.E.Thomasson M.Shimwell T.W.,O'Sullivan S.P.Carretti E.Vacca V.Bonafede A.Prandoni I.2025-03-03T20:01:00Z2025-01-07T09:25:23ZCDS support team

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

cds-question@unistra.frradio-galaxiespolarimetryDeep polarization surveys at low radio frequencies are key to cosmic magnetism studies: Larger catalogs of polarized extragalactic sources and increased precision on Faraday rotation measures (RMs) make it possible to probe the magneto-ionic medium along the lines of sight of the sources and to construct denser RM grids. In a first paper, we presented a search for polarized sources in deep observations of the 25-square-degree area of the European Large Area ISO Survey-North 1 (ELAIS-N1) field with the LOw Frequency ARray (LOFAR) at 114.9-177.4MHz. In this paper, we investigate the properties of the polarized radio galaxies and use the catalog to produce an RM grid of the field. After identifying the host galaxies and collecting redshift information, we characterized the radio galaxies in terms of their radio morphologies, rest-frame radio luminosities, and linear sizes. We calculated residual rotation measures (RRMs) by removing the Galactic RM and studied the variation in the RRMs with redshift and degree of polarization. We produced an RRM grid of the field and compared the positions of the polarized sources with those of galaxy clusters and superclusters. The radio galaxies show a variety of morphologies, including diffuse emission; Fanaroff Riley type II sources make up about half of the sample. Using available multiband catalogs, we found redshifts for the hosts of all polarized sources in the range of 0.06 to 1.9. Polarized emission is detected mainly from large radio galaxies. The RRM values have a median close to zero, and they appear to be independent of redshift and degree of polarization. The sources in the lines of sight of clusters of galaxies and of a supercluster are indistinguishable in their polarization and RRM properties from the population of sources that are not behind these structures.2025A&A...693A.100Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/693/A100CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/648/A2 : LOFAR Two-metre Sky Survey Deep Fields DR1 (Sabater+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/693/A100https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/693/A100http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/693/A100https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/693/A100https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/693/A100http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/693/A100GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/693/A100/tablea1 (Catalog of 33 polarized components in the ELAIS-N1 LOFAR deep field)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/693/A100/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/693/A100/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/693/A100/tablea1?GETtext/xml+votable180.050000true239.014955.01580.0055555555555555565/2537-2538 6/9981 10145 10147 10156-10158 10170 11349 11351 11521-11522https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/693/A100?format=asciiRadiodefaultJ/A+A/693/A100/tablea1Catalog of 33 polarized components in the ELAIS-N1 LOFAR deep fielde_GRMGGalactic rotation measure errorrad.m**-2stat.errorfloatRRMResidual rotation measure of polarized sourcerad.m**-2stat.fit.residual;phys.polarization.rotMeasurefloate_RRMResidual rotation measure errorrad.m**-2stat.errorfloatHostNameName of the polarized source host galaxymeta.id.parentcharRAHdegRight Ascension of the host galaxy (J2000)degpos.eq.raDEHdegDeclination of the host galaxy (J2000)degpos.eq.deczRedshift of the host galaxysrc.redshiftdoublee_z? Redshift errorstat.error;src.redshiftfloatnullablezType[sp] Redshift type, s = spectroscopic, p = photometricmeta.codecharr_zReferences for redshift (2)meta.ref;pos.framecharAngsizeAngular size of the radio galaxyarcsecphys.angSizeintLinsizeProjected linear size of the radio galaxykpcphys.sizeintFluxFlux density in Stokes I integrated over the radio galaxyJyphot.flux.density;em.radio.100-200MHzfloatlogLumDecimal log of rest-frame luminosity at 146MHz (W/Hz)log(W.Hz**-1)phys.luminosity;em.radio.100-200MHzfloatHostClassHost classification (3)meta.code.classcharMorphRadio morphology classification at 146MHz (4)meta.code.classcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceCatalog identification number in Piras et al. (2024A&A...687A.267P) Paper Imeta.id;phys.atmol.number;meta.tablecharLOFARName of associated total-intensity radio component in the Sabater et al. (2021A&A...648A...2S, Cat. J/A+A/648/A2) catalog, ILT_JHHMMSS.ss+DDMMSS.smeta.id;meta.maincharRAJ2000Right Ascension of polarized source (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of polarized source (J2000)degpos.eq.dec;meta.mainPpolPolarized intensityJy/beamphys.polarizationdoubleIpolStokes I intensity in the image of Sabater et al. (2021A&A...648A...2S) at the pixel of the polarized sourceJy/beamphys.polarization.stokesdoubleDegpolDegree of polarization calculated using the full-precision values of Ppol and Ipol%phys.polarization;meta.modelledfloatPolInfoFlag to indicate whether the source is listed as polarized in other catalogs (1)meta.codecharRMRotation measure of polarized sourcerad.m**-2phys.polarization.rotMeasurefloate_RMRotation measure errorrad.m**-2stat.errorfloatGRMGalactic rotation measure at the location of the polarized sourcesrad.m**-2phys.polarization.rotMeasure;pos.galacticfloat