J/A+A/699/A338ivo://CDS.VizieR/J/A+A/699/A338doi:10.26093/cds/vizier.36990338CDSHorton M.A.Hardcastle M.J.Miley G.K.Tasse C.Shimwell T.2025-08-01T20:03:22Z2025-07-16T09:16:27ZCDS support team

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

cds-question@unistra.frgalaxiescatalogsradio-continuum-emissionradio-sourcesThe LOw Frequency ARray Two-metre Sky Survey second data release (LoTSS DR2) covers 27% of the northern sky and contains around four million radio sources. The development of this catalogue involved a large citizen science project (Radio Galaxy Zoo: LOFAR) with more than 116,000 resolved sources going through visual inspection. We took a subset of sources with flux density above 75mJy and an angular size of 90" or greater, giving a total of 9985 sources or ~10% of the visually inspected sources. We classified these by visual inspection in terms of broad source type (e.g., Fanaroff-Riley class I or II, narrow or wide-angle tail, relaxed double), noticeable features (wings, visible jets, banding, filaments etc), environmental features (cluster environment, merger, diffuse emission). Our specific aim was to search for features linked to jet precession, such as a misaligned jet axis, curvature and multiple hotspots. This combination of features and morphology allowed us to detect increasingly fine-grained sub- populations of interesting or unusual sources. We found that 28% of sources showed evidence of one or more precession indicators, which could make them candidates for hosting close binary supermassive black holes. Potential precession signatures occur in sources of all sizes and luminosities in our sample but appear to favour more massive host galaxies. Our work greatly expands the sample size and parameter space of searches for precession signatures in powerful jetted sources. This work also showcases the diversity of large bright radio sources in the LOFAR surveys, whether or not precession indicators are present.2025A&A...699A.338Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/699/A338CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/622/A1 : LOFAR Two-metre Sky Survey DR1 source cat. (Shimwell+, 2019)J/A+A/659/A1 : LOFAR Two-metre Sky Survey (LoTSS) DR2 (Shimwell+, 2022)J/A+A/678/A151 : LoTSS DR2 optical IDs (Hardcastle+, 2023)http://lofar-surveys.org/dr2_release.html : LOFAR surveys websitehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/699/A338https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/699/A338http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/699/A338https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/699/A338https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/699/A338http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/699/A338GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/699/A338/catalog (Visual classifications and precession indicators for extended radio sources from LoTSS DR2)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/699/A338/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/699/A338/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/699/A338/catalog?GETtext/xml+votable180.050000true0.015666731.78486110.0055555555555555564/340 380 391 452 462-463 646 658 687 689 696 1246 1790 5/163 165-167 172-173 176 182 184 186-187 189 191 225 233 512 518-519 521-522 524 527 529-531 537 539 541-542 545 547 550 552 554 556 558 578 641-643 1151 1211-1212 1214-1215 1238-1239 1242 1244 1246 1250 1253 1258 1260-1261 1263-1264 1266-1269 1272 1274 1278-1279 1301 1310-1311 1321-1322 1324-1326 1334 1337-1339 1342-1344 1347 1349 1353 1364 1366-1367 1370-1371 1374 1376-1377 1379 1381 1387 1390 1396 1398 1401 1405 1408 1410 1418 1424 1428 1431 1434-1436 1439 1445-1447 1450 1452 1454 1456 1463-1464 1469 1475 1481-1482 1485-1486 1488 1490-1493 1495 1497-1498 1502-1503 1505 1508-1509 1526-1527 1529 1532-1533 1551 1553-1555 1557 1560 1562-1563 1586 1588 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32763https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/699/A338?format=asciiRadiodefaultJ/A+A/699/A338/catalogVisual classifications and precession indicators for extended radio sources from LoTSS DR2recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintzbest? Best estimate of the source redshift (z_best)src.redshift;pos.heliocentricdoublenullableSize? Source physical size in kpc (Size)kpcphys.angSizedoublenullableNameName of the source from the LoTSS DR2 optical ID catalogue, Cat. J/A+A/678/A151, ILTJHHMMSS.ss+DDMMSS.s (Source_Name)meta.id;meta.maincharL144? Source radio luminosity at 144 MHz (L_144)W/Hzphys.luminosity;em.radio.100-200MHzdoublenullablelogMassmed? Base 10 logarithm of source host galaxy stellar mass estimate (Mass_median)log(solMass)phys.massdoublenullablef_logMassmed[0/1] Mass quality flag (do not use if = 0) (flag_mass)meta.codeintFRI[0/1] Boolean, source is an FRI (fri)meta.codeintFRII[0/1] Boolean, source is an FRII (frii)meta.codeintHybrid[0/1] Boolean, source is a hybrid as described in the paper (hybrid)meta.codeintSpiral[0/1] Boolean, source is a spiral galaxy (spiral)meta.codeintRelaxed[0/1] Boolean, source is a relaxed double (relaxed)meta.codeintCshaped[0/1] Boolean, source is c-shaped (cshaped)meta.codeintSshaped[0/1] Boolean, source is s-shaped (sshaped)meta.codeintMisalign[0/1] Boolean, source is misaligned (misaligned)meta.codeintWings[0/1] Boolean, source has wings (wings)meta.codeintXshaped[0/1] Boolean, source is x-shaped (xshaped)meta.codeintStraight[0/1] Boolean, source has a straight jet (straight)meta.codeintMultHSpot[0/1] Boolean, source has multiple hotspots in one or both lobes (multihotspots)meta.codeintContinuous[0/1] Boolean, source has a continuous jet (continuous)meta.codeintBanding[0/1] Boolean, source shows banding structure (banding)meta.codeintOnesided[0/1] Boolean, source is one-sided (onesided)meta.codeintRestarted[0/1] Boolean, source shows signs of having restarted (restarted)meta.codeintCluster[0/1] Boolean, source is a cluster member (cluster)meta.codeintMerger[0/1] Boolean, source is a merger (merger)meta.codeintDiffuse[0/1] Boolean, source has diffuse structure only (diffuse)meta.codeintUnknown[0/1] Boolean, source classification is unknown (unknown)meta.codeintFeatureCTTotal number of features identified (featurecount)meta.numberintHasany1[0/1] Source has any one precession indicator (hasanyone)meta.codeinthasany2[0/1] Source has any two precession indicators (hasanytwo)meta.codeintHasall[0/1] Source has all three precession indicators used in the paper (hasall)meta.codeintHas1[0/1] Source has exactly one precession indicator (has_exactly_1)meta.codeintHas2[0/1] Source has exactly two precession indicators (has_exactly_2)meta.codeintSE[0/1] Source shows s symmetry and misalignment (se)meta.codeintMS[0/1] Source shows s symmetry and multiple hotspots (ms)meta.codeintEM[0/1] Source shows multiple hotspots and misalignment (em)meta.codeint_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main