J/MNRAS/546/F184ivo://CDS.VizieR/J/MNRAS/546/F1849CDSMutale M.Thompson M.A.Williams G.M.Rigby A.J.Hoare M.G.,Urquhart J.S.Bietenholz M.F.Bordiu C.Camilo C.Cotton W.D.,Goedhart S.Obonyo W.O.Riggi S.Yang A.Y.2026-03-02T06:25:50Z2026-02-09T15:52:19ZCDS support team

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

cds-question@unistra.frsurveysgalaxy-planesmilky-way-galaxyradio-continuum-emissionWe present a catalogue of compact sources detected in the SARAO MeerKAT 1.3GHz Galactic Plane Survey (SMGPS). We extract 510599 compact sources, with areas less than five 8{arcsec} beams, from the survey maps covering the regions 252{deg}<l<358{deg} and 2{deg}<l<61{deg} at |b|<=1.5{deg}, which have an angular resolution of 8{arcsec} and a sensitivity of ~10-30{mu}Jy/beam. In this paper, we describe the source identification and characterisation methods, present the quality assurance of the catalogue, explore the nature of the catalogue sources, and present initial science highlights. We limit our catalogue to sources with a signal-to-noise ratio >=5, as the catalogue is ~90 per cent complete, and has a false positive rate of less than 1 per cent at this threshold. The bulk of the catalogue sources are previously unknown to the literature, with the majority of unknown sources at sub-mJy levels. Initial science highlights from the catalogue include the detection of 213 radio quiet WISE HII region candidates, previously undetected in radio continuum studies. We show images that compare the SMGPS compact sources to CORNISH ultracompact HII regions, thus highlighting the sensitivity and unprecedented uv-coverage of the SMGPS, and the potential synergy of the SMGPS with other surveys.2026MNRAS.546f1849Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/546/F1849CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/546/F1849https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/546/F1849http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/546/F1849https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/546/F1849https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/546/F1849http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/546/F1849GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/546/F1849/smgpscsc (SMGPS compact source catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/546/F1849/smgpscsc?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/546/F1849/smgpscsc?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/546/F1849/smgpscsc?GETtext/xml+votable180.050000true267.044-27.75630.0055555555555555564/1818 1912 2357 2359 2370 2652-2653 5/3242-3243 3246 3584-3585 3588-3589 7200 7202-7203 7218-7219 7224-7225 7228-7229 7231 7278-7279 7290 7364-7365 7376-7377 7379-7380 7382-7383 7554-7555 7560-7561 7564-7565 7567 7578-7579 7582 7601 7604-7605 7654-7655 7660-7661 7672-7673 7675-7676 7678-7679 9333 9335 9341 9343 9460-9462 9467-9468 9470 9473-9476 9478 9504 9506 9512 9809 9811-9812 9814 9817 9819-9820 9822 9841 9843-9844 9846 9849 9851-9852 10399 10413-10415 10417-10422 10424 10439 10441-10445 10450-10454 10456 10539 10542-10543 10551-10554 10556-10557 10594-10595 10597-10599 10624-10625 10753-10756 10760 6/12962-12963 12990-12991 14349 14360-14361 14364 28804 28806-28807 28818 28824 28826 28829 28831-28833 28836-28837 28848 28853 28855 28888 28890-28891 28894-28895 28908-28909 28920-28921 29106-29107 29166-29167 29441 29444-29445 29469 29512-29513 29524 29526-29527 29553 29556-29557 30210-30211 30234-30235 30238 30252-30253 30264-30265 30267 30304 30306-30307 30310-30311 30334-30335 30357 30400-30401 30424-30425 30428-30429 30431 30506 30610-30611 30625 30628-30629 30653 30664 30666-30667 30670-30671 30696-30697 30708 30710-30711 32081 32084-32085 37239 37245-37247 37337 37339 37361 37363 37369-37371 37735 37741 37743 37829 37831 37837 37839 37852 37854 37861 37863 37876 37878 37884 37886 37891 37908 37910 37936 38020 38022 38028 38056-38058 38400 38402 38408 38410 39252 39416-39417 41470-41471 41591 41593-41595 41630-41631 41645-41647 41649-41651 41667 41692 41700-41702 41704-41705 41743 41754-41755 41761-41763 41784-41786 41788 41794-41795 41797-41799 41820-41822 41828-41829 41856-41858 41860 42153-42155 42162-42163 42166-42167 42191 42202-42203 42220-42222 42232-42233 42374-42375 42385-42387 42400-42402 42404-42405 42416-42417 42484-42485 42504-42505 42512-42514 42516-42517 43009-43011 43028 43032 43044 43046 430488.613890125444795e-25 8.613890125444795e-25https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/546/F1849?format=asciiRadiodefaultJ/MNRAS/546/F1849/smgpscscSMGPS compact source cataloguerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCSCCatalogue source identification number (csc_id)meta.idintNameGalactic source name (GLLL.llll+B.bbbb) (Name)meta.id;meta.maincharIAUNameIAU designation of the source name (SMGPS-CSC GLLL.llll+B.bbb) (IAUName)meta.idchartileNameFile identifier of mosaic from which the source was extracted (tileName)meta.id;meta.filecharislandA group of 1 or more Gaussians identified as pixels with contiguous source emission (island)meta.noteintsourceA single Gaussian component (source)meta.codeintbackgroundBackground flux density (background)mJy/beaminstr.backgrounddoublelocalrmsrms noise around the immediate vicinity of the source (local_rms)mJy/beamstat.stdev;instr.det.noisedoubleGLONGalactic longitude of the centroid position of the source (lon)degpos.galactic.lone_GLON? Source-extraction fitting error on Galactic longitude (err_lon)degstat.errordoublenullableGLATGalactic latitude of the centroid position of the source (lat)degpos.galactic.latdoublee_GLAT? Source-extraction fitting error on Galactic latitude (err_lat)degstat.errordoublenullableRAJ2000Right Ascension of the centroid position of the source (J2000) (ra)degpos.eq.ra;meta.mainindexedDEJ2000Declination of the centroid position of the source (J2000) (dec)degpos.eq.dec;meta.mainindexedFpeakPeak flux density 1.3GHz (peak_flux)mJy/beamphot.flux.density;em.radio.750-1500MHzdoublee_Fpeak? Source-extraction fitting error on peak flux density 1.3GHz (err_peak_flux)mJy/beamstat.errordoublenullableFintIntegrated flux density 1.3GHz (calculated as a/b/peak_flux) (int_flux)mJyphot.flux.density;em.radio.750-1500MHzdoublee_Fint? Source-extraction fitting error on integrated flux density 1.3GHz (err_int_flux)mJystat.errordoublenullableamajFitted major axis (a)arcsecphys.angSizedoublee_amaj? Error on fitted major axis (err_a)arcsecstat.errordoublenullablebminFitted minor axis (b)arcsecphys.angSize;srcdoublee_bmin? Error on fitted minor axis (err_b)arcsecstat.errordoublenullablePA[] Fitted position angle (pa)degpos.posAng;meta.modelleddoublee_PA? Error on fitted position angle (err_pa)degstat.errordoublenullableFlagsFitting flags (flags) (1)meta.code.errorintSNRSignal-to-noise ratio (calculated as peak_flux/local_rms) (snr)stat.snr;meta.modelleddoubleAreaSource area (calculated as pi.a.b/4ln2) (ea)arcsec**2phys.area;meta.modelleddoublenbsNear bright source flag (nbs) (2)meta.codechar