J/A+A/695/A144ivo://CDS.VizieR/J/A+A/695/A144doi:10.26093/cds/vizier/bc-nq/lbeeCDSBordiu C.Riggi S.Bufano F.Cavallaro F.Cecconello T.Camilo F.,Umana G.Cotton W.D.Thompson M.A.Bietenholz M.Goedhart S.,Anderson L.D.Buemi C.S.Chibueze J.O.Ingallinera A.Leto P.Loru S.,Mutale M.Rigby A.Trigilio C.Williams G.M.2026-07-03T06:36:31Z2025-03-18T10:56:55ZCDS 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 extended radio sources in the SARAO MeerKAT Galactic Plane Survey (SMGPS). Compiled from 56 survey tiles and covering approximately 500 deg^2^ across the 1st, 3rd and 4th Galactic quadrants, the catalogue includes 16534 extended and diffuse sources with areas larger than 5 synthesized beams. Among these, 3891 (24% of the total) can be confidently associated with known Galactic radio-emitting objects in the literature, such as HII regions, supernova remnants, planetary nebulae, luminous blue variables, and Wolf-Rayet stars. A significant fraction of the remaining sources, 5462 (33%), are candidate extragalactic sources, while 7181 (43%) remain unclassified. Isolated radio filaments are excluded from the catalogue. The diversity of extended sources underscores MeerKAT's contribution to the completeness of censuses of Galactic radio emitters, and its potential for new scientific discoveries. For the catalogued sources, we derive basic positional and morphological parameters, as well as flux density estimates using standard aperture photometry. This paper describes the methods followed to generate the catalogue from the original SMGPS tiles, detailing the source extraction, characterization, and cross-matching procedures. Additionally, we analyse the statistical properties of the catalogued populations.2025A&A...695A.144Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/695/A144CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/695/A144https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/695/A144http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/695/A144https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/695/A144https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/695/A144http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/695/A144GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/695/A144/smgpsext (SMGPS extended source catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/695/A144/smgpsext?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/695/A144/smgpsext?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/695/A144/smgpsext?GETtext/xml+votable180.050000true267.08567-27.751250.0055555555555555564/2357 2359 2652-2653 5/3242-3243 3584-3585 3588 7200 7202-7203 7218-7219 7224-7225 7228-7229 7272 7274-7275 7278-7279 7365 7376-7377 7379-7380 7382-7383 7554 7560-7561 7564-7565 7567 7578-7579 7582 7601 7604-7605 7648 7650-7651 7654-7655 7661 7672-7673 7675-7676 7678-7679 9333 9335 9341 9343 9460-9462 9468 9470 9473 9475-9476 9480-9482 9504 9506 9809 9811-9812 9814 9817 9819-9820 9822 9841 9843-9844 9846 9849 9852 10399 10413-10415 10418-10421 10439 10441-10445 10450-10454 10539 10542-10543 10553 10556-10557 10594-10595 10597-10599 10624-10625 10753-10756 10760 6/12962-12963 12984 12986-12987 12990-12991 14349 14356-14358 14360-14361 14364 28804 28806-28807 28818 28824 28826 28831-28833 28836-28837 28853 28888 28890-28891 28894 28909 28920-28921 28924-28925 28927 29092 29094-29095 29106 29162-29163 29166 29441 29444-29445 29456-29457 29459 29512-29513 29526-29527 29553 29556 30210 30220 30222-30223 30234-30235 30253 30264-30265 30267 30304 30306-30307 30334-30335 30400-30401 30425 30428-30429 30431 30596 30598-30599 30610-30611 30628-30629 30640-30641 30643 30653 30664 30666-30667 30670 30696-30697 30710-30711 32081 32084-32085 37239 37245 37247 37339 37361 37363 37369 37371 37743 37829 37831 37837 37839 37852 37854 37861 37863 37869-37871 37876 37878 37884 37886 37891 37897-37899 37908 37910 37912-37914 37932-37934 37936 38020 38022 38048 38050-38051 38056 38058 38400 38402 38408 39252 39405 39416-39417 41470-41471 41591 41594-41595 41630-41631 41647 41649-41651 41667 41669-41671 41688-41690 41692 41696-41698 41700-41701 41704 41754-41755 41761-41763 41784 41786 41794-41795 41798-41799 41820-41822 41824-41826 41828-41829 41856-41858 41860 42154-42155 42166-42167 42206-42207 42209-42211 42216-42218 42220-42221 42232 42375 42386-42387 42400-42402 42404-42405 42416 42485 42504-42505 42512-42513 42516 43010-43011 43028 43032 43044 43048https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/695/A144?format=asciiRadiodefaultJ/A+A/695/A144/smgpsextSMGPS extended source cataloguerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource name (internal) (name)meta.idcharIAUNameSource IAU name, GLLL.lll+BB.bbb (iauName)meta.id;meta.maincharnpixNumber of pixels (npix)meta.numberintnnestedNumber of nested sources (nnested)meta.numberintnnestedExtNumber of extended nested sources (nnested_ext)meta.numberintMTypeMorphology tag (morph_type)src.morphintbboxXBounding box x coordinate (bbox_x)pixpos.cartesian.x;instr.detfloatbboxYBounding box y coordinate (bbox_y)pixpos.cartesian.y;instr.detfloatbboxWBounding box width (bbox_w)pixspect.line.widthintbboxHBounding box height (bbox_h)pixphys.sizeintbboxrXRotated bounding box x coordinate (bbox_rot_x)pixpos.cartesian.x;instr.detfloatbboxrYRotated bounding box y coordinate (bbox_rot_y)pixpos.cartesian.y;instr.detfloatbboxrWRotated bounding box width (bbox_rot_w)pixspect.line.widthfloatbboxrHRotated bounding box height (bbox_rot_h)pixphys.sizefloatbboxrthetaBounding box rotation angle (bbox_rot_theta)degpos.posAngfloatx0Centroid x coordinate (x0)pixpos.cartesian.x;instr.detfloaty0Centroid y coordinate (y0)pixpos.cartesian.y;instr.detfloatGLONCentroid Galactic longitude (l)degpos.galactic.lonSbkgSum of background brightness from median estimator (Sbkg)Jy/beamphot.flux.density;em.radio.750-1500MHzdoubleSbkgInterpSum of background brightness from interpolation (Sbkg_interp)Jy/beamphot.flux.density;em.radio.750-1500MHzdoubleSbkgFitSum of background brightness from polynomial fit (Sbkg_fit)Jy/beamphot.flux.density;em.radio.750-1500MHzdoubleGLATCentroid Galactic latitude (b)degpos.galactic.latdoubleRAJ2000Centroid Right Ascension (J2000) (ra)degpos.eq.ra;meta.mainindexedDEJ2000Centroid Declination (J2000) (dec)degpos.eq.dec;meta.mainindexedx0w? Flux-weighted centroid x coordinate (x0_w)pixpos.cartesian.x;instr.detdoublenullabley0w? Flux-weighted centroid y coordinate (y0_w)pixpos.cartesian.y;instr.detdoublenullableGLONw? Flux-weighted centroid Galactic longitude (l_w)degpos.galactic.lonnullableGLATw? Flux-weighted centroid Galactic latitude (b_w)degpos.galactic.latdoublenullableRadBounding box half-diagonal (radius)pixphys.angSize;srcfloatRadWCSBounding box half-diagonal (radius_wcs)arcminphys.angSize;srcfloatx0mincMinimum bounding circle centroid x coordinate (x0_mincircle)pixpos.cartesian.x;instr.detfloaty0mincMinimum bounding circle centroid y coordinate (y0_mincircle)pixpos.cartesian.y;instr.detfloatRadmincMinimum bounding circle radius (radius_mincircle)pixphys.angSize;srcfloatx0mincWCSMinimum bounding circle centroid Galactic longitude (x0_mincircle_wcs)degpos.galactic.lon;stat.mindoubley0mincWCSMinimum bounding circle centroid Galactic latitude (y0_mincircle_wcs)degpos.galactic.lat;stat.mindoubleRadmincWCSMinimum bounding circle radius (radius_mincircle_wcs)arcminphys.angSize;stat.minfloatminSizeWCSMinimum size of the minimum bounding rectangle (minSize_wcs)arcminphys.angSize;srcfloatmaxSizeWCSMaximum size of the minimum bounding rectangle (maxSize_wcs)arcminphys.angSize;stat.max;stat.minfloatSSum of source brightness (S)Jy/beamphot.flux.density;em.radio.750-1500MHzdoubleSminMinimum source brightness (Smin)Jy/beamphot.flux.density;em.radio.750-1500MHzdoubleSmaxMaximum source brightness (Smax)Jy/beamphot.flux.density;em.radio.750-1500MHzdoubleSmeanMean source brightness (Smean)Jy/beamphot.flux.density;em.radio.750-1500MHzdoubleSmedianMedian source brightness (Smedian)Jy/beamphot.flux.density;em.radio.750-1500MHzdoubleSstddevStddev of the source brightness (Sstddev)Jy/beamphot.flux.density;em.radio.750-1500MHzdoubleSerrBkgBackground brightness uncertainty (Serr_bkg)Jy/beamstat.errordoubleSerrNoiseTotal source brightness uncertainty (Serr_noise)Jy/beamstat.errordoubleSnoiseSum of background rms extrapolated over source size in beams (Snoise)Jy/beamstat.errordoubleStotBackground-subtracted source brightness (Stot)Jy/beamphot.flux.density;em.radio.750-1500MHzdoublee_Stot? Background-subtracted source brightness uncertainty (Stot_err)Jy/beamstat.errordoublenullableFlux? Source flux density (background-subtracted) (flux)Jyphot.flux.density;em.radio.750-1500MHzdoublenullablee_Flux? Source flux density uncertainty (fluxErr)Jystat.error;phot.fluxdoublenullableStotNestedSum of source brightness of nested point-like and compact sources (Stot_nested)Jy/beamphot.flux.density;em.radio.750-1500MHzdoublee_StotNested? Uncertaintyin the sum of source brighness of nested point-like and compact sources (Stot_err_nested)Jy/beamstat.errordoublenullableStotnoPSSource brightness after subtracting nested compact sources (Stot_noPS)Jy/beamphot.flux.density;em.radio.750-1500MHzdoublee_StotnoPS? Uncertainty of source brightness after subtracting nested compact sources (Stot_err_noPS)Jy/beamstat.errordoublenullableFluxnoPSSource flux density after subtracting nested compact sources (flux_noPS)Jyphot.flux.density;em.radio.750-1500MHzdoublee_FluxnoPS? Uncertainty in source flux density after subtracting nested compact sources (flux_err_noPS)Jystat.errordoublenullableFluxReliab[0/1] Flux density is likely reliable considering theoretical spatial filtering (0=NO, 1=YES) (is_flux_reliable)meta.codeintBorder[0/1] Source is in the tile border (0=NO,1=YES) (border)meta.codeintClassNameSource classification label (classname)meta.code.classcharClassId[-1/6]? Source classification (classid) (1)meta.codeintnullableONamesCrossmatched catalogue source(s) (objname)meta.idcharTileIdSMGPS tile image name (tileid)obs.fieldchar