J/A+A/693/A202ivo://CDS.VizieR/J/A+A/693/A202doi:10.26093/cds/vizier.36930202CDSBerger A.Adebahr B.Wright A.H.Hildebrandt H.Dettmar R.-J.,Adams E.A.K.Denes H.Hess K.M.Morganti R.Damstra S.Kutkin A.,Loose G.M.Mika A.Oostrum L.C.van Leeuwen J.Ziemke J.2025-03-03T20:01:18Z2025-01-17T08:48:34ZCDS support team

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

cds-question@unistra.frradio-sourcesradio-continuum-emissionpolarimetryWe analysed six Apertif datasets, covering the GOODS-N LOFAR deep field region, aiming to improve our understanding of the faint radio source composition, their polarisation behaviour, and how this affects our interpretation of polarised source counts. Using a semi-automatic routine, we ran rotation measure synthesis to generate a polarised intensity mosaic for each observation. The routine also performs source finding and cross-matching with the total power catalogue, as well as NVSS, SDSS and allWISE, to obtain a catalogue of 1182 polarised sources in an area of 47.4deg^2^. Using the mid-infrared (MIR) radio correlation, we found no indication of any polarised emission from star formation. To robustly estimate the source counts, we performed an investigation of our sample's completeness as a function of the polarised flux via synthetic source injection. In contrast to previous works, we find no strong dependency of fractional polarisation on the total intensity flux density. We argue that differences regarding previous (small-scale, deep field) analyses can be attributed to sample variance. Relative to the findings of previous works, here we find a steeper slope for our Euclidean-normalised differential source counts. This is also visible as a flattening in cumulative source counts. We attribute the observed steeper slope in Euclidean normalised differential source counts to a change in the source composition and properties at low total intensities.2025A&A...693A.202Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/693/A202CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/653/1027 : TKRS/GOODS-N Field galaxies (Weiner+, 2006)J/ApJ/689/687 : GOODS-N spectroscopic survey (Barger+, 2008)J/ApJ/762/46 : SHARDS: GOODS-N spectrophotometry surveyhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/693/A202https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/693/A202http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/693/A202https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/693/A202https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/693/A202http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/693/A202GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/693/A202/catalog (Polarised source catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/693/A202/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/693/A202/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/693/A202/catalog?GETtext/xml+votable180.050000true185.692884554380263.92570490670570.0055555555555555565/2805-2807 2809-2814 2976-2978 6/6013 6015 6103 6109 6111 6133 6135 11134-11135 11197-11199 11213-11215 11217-11219 11233-11235 11260-11261 11916-11918 11920 11936-119382.381800341673347e-19 6.090060298487514e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/693/A202?format=asciiRadiodefaultJ/A+A/693/A202/catalogPolarised source cataloguee_PIcIslPolarised intensity uncertaintyJystat.errordoubleSDSSID of the crossmatched SDSS sourcemeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension of polarised source (J2000)degpos.eq.ra;meta.maine_RAJ2000Right ascension uncertainty (J2000)degstat.error;pos.eq.radoubleDEJ2000Declination of polarised sourcedegpos.eq.dec;meta.maine_DEJ2000Declination uncertaintydegstat.error;pos.eq.decdoublePIIslPolarised intensity of source measured in islandJyphot.flux.density;em.radio.750-1500MHzdoublee_PIIslPolarised intensity uncertaintyJystat.errordoublePIfitPolarised intensity measured by fitting the sourceJyphot.flux.density;em.radio.750-1500MHzdoublee_PIfitPolarised intensity uncertaintyJystat.errordoubleRAcdegRight ascension of polarised componentdegpos.eq.rae_RAcdegRight ascension uncertaintydegstat.error;pos.eq.radoubleDEcdegDeclination of the polarised componentdegpos.eq.dece_DEcdegDeclination uncertaintydegstat.error;pos.eq.decdoublePIcIslPolarised intensity of the source, the component belongs to, measured in islandJyphot.flux.density;em.radio.750-1500MHzdoublePIcfitPolarised intensity measured by fitting the componentJyphot.flux.density;em.radio.750-1500MHzdoublee_PIcfitPolarised intensity uncertaintyJystat.errordoublePIcPeakPeak polarised intensity from fittingJyphot.flux.density;em.radio.750-1500MHzdoublee_PIcPeakPeak polarised intensity uncertaintyJystat.errordoublePIrmsrms of the polarised intensity of the islandJystat.errordoubleIslIdIsland IDmeta.idintRMcRotation measure of the componentdegphys.polarization.rotMeasuredoublee_RMcRotation measure uncertaintydegstat.errordoubleTPTITotal intensity of the sourceJyphot.flux.density;em.radio.750-1500MHzdoublee_TPTITotal intensity uncertaintyJystat.errordoubleRATdegRight ascension of the total intensity sourcedegpos.eq.rae_RATdegRight ascension uncertaintydegstat.errordoubleDETdegDeclination ot the total intensity sourcedegpos.eq.dece_DETdegDeclination uncertaintydegstat.errordoubleFPIslFractional polarisation of the source calculated using PIIslphys.polarizationdoublee_FPIslFractional polarisation uncertaintystat.errordoubleFPfitFractional polarisation of the source calculated using PIfitphys.polarizationdoublee_FPfitFractional polarisation uncertaintystat.errordoubleNVSS-I? Total intensity from the NVSSJyphot.flux.density;em.radio.750-1500MHzdoublenullablee_NVSS-I? NVSS total intensity uncertaintyJystat.errordoublenullableNVSS-PI? Polarised intensity from the NVSSJyphys.polarizationdoublenullablee_NVSS-PI? NVSS polarised intensity uncertaintyJystat.errordoublenullableNVSS-FP? Fractional polarisation from the NVSSphys.polarizationdoublenullablee_NVSS-FP? NVSS fractional polarisation uncertaintystat.errordoublenullableNVSS-RM? Rotation measure from the NVSSphys.polarization.rotMeasurefloatnullablee_NVSS-RM? NVSS rotation measure uncertaintystat.errorfloatnullableRANdeg? Right ascension of the NVSS sourcedegpos.eq.ranullablee_RANdeg? Right ascension uncertaintysstat.errorfloatnullableDENdeg? Declination of the NVSS sourcedegpos.eq.decnullablee_DENdeg? Declination uncertaintyarcsecstat.errorfloatnullableRAWdeg? Right ascension of the allWISE sourcedegpos.eq.ranullablee_RAWdeg? Right ascension uncertaintyarcsecstat.errorfloatnullableDEWdeg? Declination of the allWISE sourcedegpos.eq.decnullablee_DEWdeg? Declination uncertaintyarcsecstat.errorfloatnullable[3.4]? allWISE magnitude in W1magphot.mag;em.IR.3-4umfloatnullablee_[3.4]? W1 uncertaintymagstat.errorfloatnullableSNRW3.4? W1 signal to noise ratiostat.snrfloatnullable[4.6]? allWISE magnitude in W2magphot.mag;em.IR.4-8umfloatnullablee_[4.6]? W2 uncertaintymagstat.errorfloatnullableSNRW4.6? W2 signal to noise ratiostat.snrfloatnullable[12]? allWISE magnitude in W3magphot.flux.density;em.IR.8-15umfloatnullablee_[12]? W3 uncertaintymagstat.errorfloatnullableSNRW12? W3 signal to noise ratiostat.snrfloatnullable[22]? allWISE magnitude in W4magphot.flux.density;em.IR.15-30umfloatnullablee_[22]? W4 uncertaintymagstat.errorfloatnullableSNRW22? W4 signal to noise ratiostat.snrfloatnullableRASdeg? Right ascension of the SDSS sourcedegpos.eq.ranullableDESdeg? Declination of the SDSS sourcedegpos.eq.decnullableumag? Magnitude in u-filter from SDSSmagphot.mag;em.opt.Udoublenullablee_umag? u-filter magnitude uncertaintymagstat.error;phot.magdoublenullablegmag? Magnitude in g-filter from SDSSmagphot.mag;em.opt.Bdoublenullablee_gmag? g-filter magnitude uncertaintymagstat.error;phot.magdoublenullablermag? Magnitude in r-filter from SDSSmagphot.mag;em.opt.Rdoublenullablee_rmag? r-filter magnitude uncertaintymagstat.error;phot.magdoublenullableimag? Magnitude in i-filter from SDSSmagphot.mag;em.opt.Idoublenullablee_imag? i-filter magnitude uncertaintymagstat.error;phot.magdoublenullablezmag? Magnitude in z-filter from SDSSmagphot.mag;em.opt.Idoublenullablee_zmag? z-filter magnitude uncertaintymagstat.error;phot.magdoublenullablezSDSS? Spectroscopic redshift from SDSSsrc.redshift;pos.heliocentricdoublenullablee_zSDSS? Redshift uncertaintystat.errordoublenullableGNOriginal image the source was taken from (see paper Sect. 2.3 for details)obs.imageintIDSource ID as assigned by Aperpol (APGN_ddd.ddd+dd.ddd)meta.id;meta.maincharSCode[SEFC] S_Code (1)meta.codecharTPID of the associated Apertif total intensity source (TP_ddd.ddd+dd.ddd)meta.id.assoc;spect.line.intensitycharWISEID of the crossmatched allWISE sourcemeta.idchar