J/A+A/713/A154ivo://CDS.VizieR/J/A+A/713/A154CDSTasseroul M.De Becker M.Benaglia P.Tej A.2026-09-16T08:39:59Z2026-09-16T09:35:25ZCDS support team

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

cds-question@unistra.frwolf-rayet-starsradio-continuum-emissiongalaxy-planesmilky-way-galaxystellar-distanceMassive stars, including Wolf-Rayet stars (WR), are found mainly in binary systems. These systems are known to emit both thermal emission from stellar winds and sometimes non-thermal emission produced by relativistic electrons accelerated in the wind-wind interaction region. We intend to provide the most complete census of radio emission from WR stars in the Galactic plane, using the SARAO Meerkat Galactic Plane Survey (SMGPS) complemented by the MeerKAT Galactic Center Survey (MGCS). Our main motivation is to identify hints of synchrotron radio emission indicative of particle-accelerating colliding-wind binaries (PACWB). We compiled an input catalogue of 428 WR stars positionally covered by the SMGPS and the MGCS. Using the Survey data, we measured the radio emission at 1.3GHz for detected WR stars, and we measured the upper limits for objects located in sufficiently low radio background regions. For detected objects, we searched for a radio excess by comparing the measured fluxes to two different evaluators of the thermal emission from massive star winds. We detected 23 targets and determined the upper limits for 279 WR stars. Among the detected objects, 15 display a (significant or potential) radio excess that cannot be explained by unresolved circumstellar emission of any kind. Removing already known PACWBs, we report on the identification of 12 potential new PACWB candidates. Our study led to the compilation of the most extensive catalogue of Galactic WR radio (snapshot) emission to date, based on a homogeneous data set covering the Galactic plane. The low detection rate indicates either a low occurrence rate of synchrotron emission or substantial attenuation by turnover processes, certainly dominated by free-free absorption from the WR wind material. Our results open the door for dedicated follow-up observations to ascertain the nature of the identified radio excesses.2026A&A...713A.154Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/713/A154CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/713/A154https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/713/A154http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/713/A154https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/713/A154https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/713/A154http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/713/A154GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/713/A154/table1 (Radio emission of the 428 Wolf-Rayet (WR) stars analysed using the SMGPS (SARAO Meerkat Galactic Plane Survey) and the MGCS (MeerKAT Galactic Center Survey))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/713/A154/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/713/A154/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/713/A154/table1?GETtext/xml+votable180.050000true266.45238-28.834920.0055555555555555565/9482 6/12970 28802-28803 28806 28808-28809 28818 28824-28826 28830 28903 28912-28913 28915-28916 28918-28919 28924-28925 29090-29091 29094-29097 29101 29114 29118 29162 29504-29505 29507-29508 29510 29517 29522-29523 29528-29529 29532 29534 30218-30219 30222-30223 30241 30244-30246 30256 30258-30259 30262-30264 30269-30270 30313 30318 30418 30420 30600 30604-30605 30618-30619 30644 30666 30690-30692 30694 30706 30713 30715-30716 30719 32085 37247 37333 37343 37364-37365 37713 37840 37882 37893 37895 37901 37904 37906-37907 37921-37924 37926 37932 38016-38017 38019 38026 41653-41658 41675 41677-41678 41681 41683-41685 41688 41697-41698 41758-41759 41768 41773 41777 41780 41800 41802 41805 41811 41814 41816 42155 42159 42167-42168 42170 42175 42206-42207 42211 42213-42217 42225-42229 42377 42379 42382 42387 42394 42434-42436 42438 42440-42441 42444 42455 42462 42496-42497 42500-42502 43013-43015 43017-43019 43024-43025 43040-430428.613890125444795e-25 8.613890125444795e-25https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/713/A154?format=asciiRadiodefaultJ/A+A/713/A154/table1Radio emission of the 428 Wolf-Rayet (WR) stars analysed using the SMGPS (SARAO Meerkat Galactic Plane Survey) and the MGCS (MeerKAT Galactic Center Survey)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the starmeta.id;meta.maincharSpTypeSpectral type from the reference cataloguesrc.spTypecharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latdoubleDistDistancepcpos.distanceintn_Dist[*] Note on Dist (1)meta.notecharr_DistSource for the distance (2)meta.ref;pos.framecharRefMain source reference (3)meta.ref;pos.frame;meta.maincharl_S1.3Limit flag on S1.3meta.code.errorcharS1.3? Flux density at 1.3GHz (4)mJyphot.flux.density;em.radio.750-1500MHzfloatnullablee_S1.3? Associated error of flux density at 1.3GHzmJystat.errorfloatnullableFlagFlag (5)meta.code.errorchar