J/A+A/670/A124ivo://CDS.VizieR/J/A+A/670/A124doi:10.26093/cds/vizier.36700124CDSCallingham J.R.Shimwell T.W.Vedantham H.K.Bassa C.G.O'Sullivan S.P.,Yiu T.W.H.Bloot S.Best P.N.Hardcastle M.J.Haverkorn M.,Kavanagh R.D.Lamy L.Pope B.J.S.Rottgering H.J.A.Schwarz D.J.,Tasse C.van Weeren R.J.White G.J.Zarka P.Bomans D.J.Bonafede A.,Bonato M.Botteon A.Bruggen M.Chyzy K. T.Drabent A.Emig K.L.,Gloudemans A.J.Gurkan G.Hajduk M.Hoang D.N.Hoeft M.Iacobelli M.,Kadler M.Kunert-Bajraszewska M.Mingo B.Morabito L.K.Nair D.G.,Perez-Torres M.Ray T.P.Riseley C.J.Rowlinson A.Shulevski A.,Sweijen F.Timmerman R.Vaccari M.Zheng J.2024-11-06T20:02:27Z2023-02-17T07:20:07ZCDS support team

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

cds-question@unistra.frsurveyspolarimetryradio-continuum-emissionradio-sourcesWe present the detection of 68 sources from the most sensitive radio survey in circular polarisation conducted to date. We used the second data release of the 144MHz LOFAR Two-metre Sky Survey to prodce circularly polarised maps with a median noise of 140uJy/beam and resolution of 20-arcsec for 27% of the northern sky (5634deg^2^). The leakage of total intensity into circular polarisation is measured to be ~0.06%, and our survey is complete at flux densities >=1mJy. A detection is considered reliable when the circularly polarised fraction exceeds 1%. We find the population of circularly polarised sources is composed of four distinct classes: stellar systems, pulsars, active galactic nuclei, and sources unidentified in the literature. The stellar systems can be further separated into chromospherically active stars, M dwarfs, and brown dwarfs. Based on the circularly polarised fraction and lack of an optical counterpart, we show it is possible to infer whether the unidentified sources are likely unknown pulsars or brown dwarfs. By the completion of this survey of the northern sky, we expect to detect 300+/-100 circularly polarised sources.2023A&A...670A.124Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/670/A124CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)J/A+A/659/A1 : LOFAR Two-metre Sky Survey (LoTSS) DR2 (Shimwell+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/670/A124https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/670/A124http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/670/A124https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/670/A124https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/670/A124http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/670/A124GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/670/A124/catalog (V-LoTSS DR2 flux scaled catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/670/A124/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/670/A124/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/670/A124/catalog?GETtext/xml+votable180.050000true12.141364097595234.20211029052730.0055555555555555566/2331 2365 2573 4831 5028 5080 5329 5371 5387 5534 5590 5601 5727 5772 5882 5950 6051 6122 6241 6262 6340 6563 7391 7439 7451 7561 9150 9300 9442 9497 9515 9803 9965 9974 9992 10137 10156 10255 10303 10446 10481 10663 10760 10905 11048 11287 11290 11351 11376 11447 11543 11625 13316 13355 13464 13504 13538 15009 15013 15030 20166 20209 20212 20286 20460 28646 32704 327511.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/670/A124?format=asciiRadiodefaultJ/A+A/670/A124/catalogV-LoTSS DR2 flux scaled cataloge_RAIdegrms uncertainty in Stokes I RA (e_RA_i)arcsecstat.errordoublee_Per? Uncertainty in the period of pulsar in PSRCAT (e_period_psr)sstat.errorfloatnullabledPer? Period derivative of pulsar in PSRCAT (period_deriv_psr)s/stime.periodfloatnullablee_dPer? Uncertainty in the period derivative of pulsar in PSRCAT (e_period_deriv_psr)s/sstat.errorfloatnullableDEIdegStokes I Declination (J2000) (Dec_i)degpos.eq.dece_DEIdegrms uncertainty in Stokes I Declination (e_Dec_i)arcsecstat.errordoubleFtotVIntegrated Stokes V flux density of the source (Total_flux_v)mJyphot.flux.density;em.opt.Vdoublee_FtotV1-sigma uncertainty on the total Stokes V flux density (e_Total_flux_v)mJystat.errordoubleFtotIIntegrated Stokes I flux density of the source (Total_flux_i)mJyphot.flux.density;em.opt.Idoublee_FtotI1-sigma uncertainty on the total Stokes I flux density (e_Total_flux_i)mJystat.errordoublevICircularly-polarised fraction I (v_i)%phys.polarization.stokesdoublee_vI1-sigma uncertainty in the circularly-polarised fraction (v_i_err)%stat.errordoublelocalrmsVAverage background rms value of the source in Stokes V (local_rms_v)mJy/beamstat.errordoublelocalrmsIAverage background rms value of the source in Stokes I (local_rms_i)mJy/beamstat.errordoubleFieldField name (field_name)obs.fieldcharObs.dateDate of the LOFAR observation for the reported field (date_obs)time.epochnullabledupdetectNumber of independent detections in different LoTSS fields (dup_detect)meta.numberfloatGaiaGaia DR2 or DR3 source designation, Gaia DRN NNNNNNNNNNNNNNNNNNN (designation_gaia)meta.idcharRAGdeg? Gaia DR3 Right ascension (J2000) (RA_gaia)degpos.eq.ranullableDEGdeg? Gaia DR3 Declination (J2000) (Dec_gaia)degpos.eq.decnullableplx? Gaia DR3 parallax (parallax)maspos.parallax.trigdoublenullablee_plx? Uncertainty in Gaia DR3 parallax (e_parallax)masstat.error;pos.parallaxdoublenullablepm? Gaia DR3 proper motion (pm)arcsecpos.pmdoublenullablerefEpGaia? Gaia DR3 reference epoch (ref_epoch_gaia)yrmeta.ref;pos.framefloatnullableGmag? Gaia DR3 G-band mean magnitude (phot_g_mean_mag_gaia)magphot.mag;em.optdoublenullableBP-RP? Gaia DR3 BP-RP colour (bp_rp_gaia)magphot.color;em.opt.B;em.opt.RdoublenullablePer? Period of pulsar in PSRCAT (period_psr)stime.perioddoublenullableVLoTSSName of the source following the naming convention of LoTSS-DR2, ILTJHHMMSS.ss+DDMMSS.s (VLoTSS_name)meta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the source in SIMBAD or PSRCAT (if known) (Common_name)meta.idcharSimbadNameSimbad column added by the CDSmeta.idcharnullableRAJ2000Stokes V Right ascension (J2000) (RA_v)degpos.eq.ra;meta.maine_RAJ2000rms uncertainty in Stokes V RA (e_RA_v)arcsecstat.error;pos.eq.radoubleDEJ2000Stokes V Declination (J2000) (Dec_v)degpos.eq.dec;meta.maine_DEJ2000rms uncertainty in Stokes V Declination (e_Dec_v)arcsecstat.error;pos.eq.decdoubleRAIdegStokes I Right ascension (J2000) (RA_i)degpos.eq.ra