J/A+A/693/A247ivo://CDS.VizieR/J/A+A/693/A247doi:10.26093/cds/vizier.36930247CDSAnderson L.D.Camilo F.Faerber T.Bietenholz M.Bordiu C.Bufano F.,Chibueze J.O.Cotton W.D.Ingallinera A.Loru S.Rigby A.Riggi S.,Thompson M.A.Trigilio C.Umana G.Williams G.M.2025-03-07T20:01:07Z2025-01-22T07:40:31ZCDS support team

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

cds-question@unistra.frsupernova-remnantsradio-sourcesSensitive radio continuum data could bring the number of known supernova remnants (SNRs) in the Galaxy more in line with what is expected. Due to confusion in the Galactic plane, however, faint SNRs can be challenging to distinguish from brighter HII regions and filamentary radio emission. We exploited new 1.3GHz SARAO MeerKAT Galactic Plane Survey (SMGPS) radio continuum data, which cover 251{deg}<l<358{deg} and 2{deg}<l<61{deg} at |b|<1.5{deg}, to search for SNR candidates in the Milky Way disk. We also used mid-infrared data from the Spitzer GLIMPSE, Spitzer MIPSGAL, and WISE surveys to help identify SNR candidates. These candidates are sources of extended radio continuum emission that lack mid-infrared counterparts, are not known as HII regions in the WISE Catalog of Galactic HII Regions, and have not been previously identified as SNRs. We locate 237 new Galactic SNR candidates in the SMGPS data. We also identify and confirm the expected radio morphology for 201 objects classified in the literature as SNRs and 130 previously identified SNR candidates. The known and candidate SNRs have similar spatial distributions and angular sizes. The SMGPS data allowed us to identify a large population of SNR candidates that can be confirmed as true SNRs using radio polarization measurements or by deriving radio spectral indices. If the 237 candidates are confirmed as true SNRs, it would approximately double the number of known Galactic SNRs in the survey area, alleviating much of the discrepancy between the known and expected populations.2025A&A...693A.247Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/693/A247CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/693/A247https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/693/A247http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/693/A247https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/693/A247https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/693/A247http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/693/A247GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/693/A247/kgreen (Known SNRs from the online Green catalog (table A1))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/693/A247/kgreen?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/693/A247/kgreen?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/693/A247/kgreen?GETtext/xml+votable180.050000true132.95964-46.257590.005555555555555556Cone search capability for table J/A+A/693/A247/ksnrcat (Known SNRs from the online SNRCat (table A2))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/693/A247/ksnrcat?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/693/A247/ksnrcat?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/693/A247/ksnrcat?GETtext/xml+votable180.050000true133.90038-46.73760.005555555555555556Cone search capability for table J/A+A/693/A247/candid (Previously identified SNR candidates (table A3))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/693/A247/candid?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/693/A247/candid?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/693/A247/candid?GETtext/xml+votable180.050000true196.18321-63.061890.005555555555555556Cone search capability for table J/A+A/693/A247/meerkatc (SNR candidates identified from the SMGPS (table A4))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/693/A247/meerkatc?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/693/A247/meerkatc?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/693/A247/meerkatc?GETtext/xml+votable180.050000true126.80996-38.669170.005555555555555556Cone search capability for table J/A+A/693/A247/meerkato (Unusual sources in the SMGPS (table A5))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/693/A247/meerkato?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/693/A247/meerkato?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/693/A247/meerkato?GETtext/xml+votable180.050000true141.85562-52.261430.005555555555555556Cone search capability for table J/A+A/693/A247/list (List of fits images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/693/A247/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/693/A247/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/693/A247/list?GETtext/xml+votable180.050000true269.4448329-23.69847340.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/693/A2475/3585 7202-7203 7225 7228 7377 7383 7578-7579 7604-7605 7651 7672 7679 9341 9476 9481-9482 10413-10414 10420 10442 10444 10450 10453 10542-10543 10553 10556 10595 10614 6/12968 12970 12974 14336-14337 14352-14353 14355-14356 14358 28802-28803 28806-28807 28819 28824 28826 28831 28837 28874-28875 28878-28879 28890 28896-28897 28918-28920 28925 29090-29091 29094 29096-29097 29100-29101 29103 29112 29114-29115 29117-29119 29162-29163 29460-29461 29504-29505 29507 29516 29520 29522-29523 29526 29528-29529 29531 30216 30218-30219 30222 30240-30241 30244-30245 30247 30256 30258-30259 30262-30263 30265 30268-30269 30306-30307 30330-30331 30335 30405 30425 30429 30431 30592 30594-30595 30598-30601 30603 30616 30618-30619 30622 30640-30641 30643-30645 30666-30667 30692 30694-30695 30700-30701 30706-30707 30710 30712-30714 37247 37333-37335 37339 37343 37361 37369 37371-37373 37375 37713 37715 37717 37721 37723 37725 37727 37745 37747 37754 37841 37849-37850 37869 37872 37874 37893-37894 37899 37901-37903 37912 37923 37932 38016 38018-38019 38022 38024 38026-38027 38058 38400 39271 39282 39290 39364 41595 41598-41599 41645 41647 41660-41662 41670-41671 41673-41678 41684-41685 41690 41696 41700 41757-41759 41763 41765-41767 41772-41773 41780-41781 41783 41798-41799 41804-41806 41809-41811 41816-41817 41820-41821 41824 42154-42155 42158-42159 42167 42206-42207 42210-42211 42216-42218 42220-42221 42228-42229 42377-42379 42387 42389-42394 42396-42398 42400-42401 42404 42432 42434-42435 42438-42441 42443-42446 42448 42450-42451 42454-42455 42460-42461 42463 42496-42498 42500-42502 42513 43011 43013-43014 43017-43020 43024-43025https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/693/A247?format=asciiRadiodefaultJ/A+A/693/A247/kgreenKnown SNRs from the online Green catalog (table A1)NameName (GLLL.l+B.b or GLLL.lll+BB.bbb)meta.id;meta.maincharGLONGalactic Longitudedegpos.galactic.lonGLATGalactic Latitudedegpos.galactic.latRadRadius assuming circular morphologyarcminphys.angSizefloatRelFrom I to III in decreasing reliability (only for meerkatc.dat) (1)meta.code.qualchar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.raindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decindexedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJ/A+A/693/A247/ksnrcatKnown SNRs from the online SNRCat (table A2)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName (GLLL.l+B.b or GLLL.lll+BB.bbb)meta.id;meta.maincharGLONGalactic Longitudedegpos.galactic.lonGLATGalactic Latitudedegpos.galactic.latRadRadius assuming circular morphologyarcminphys.angSizefloatRelFrom I to III in decreasing reliability (only for meerkatc.dat) (1)meta.code.qualchar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.raindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decindexedJ/A+A/693/A247/candidPreviously identified SNR candidates (table A3)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGLONGalactic Longitudedegpos.galactic.lonGLATGalactic Latitudedegpos.galactic.latRadRadius assuming circular morphologyarcminphys.angSizefloatRefReference (1)meta.ref;pos.framecharNameName as in the original publicationsmeta.id;meta.mainchar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.raindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decindexedJ/A+A/693/A247/meerkatcSNR candidates identified from the SMGPS (table A4)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName (GLLL.l+B.b or GLLL.lll+BB.bbb)meta.id;meta.maincharGLONGalactic Longitudedegpos.galactic.lonGLATGalactic Latitudedegpos.galactic.latRadRadius assuming circular morphologyarcminphys.angSizefloatRelFrom I to III in decreasing reliability (only for meerkatc.dat) (1)meta.code.qualchar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.raindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decindexedJ/A+A/693/A247/meerkatoUnusual sources in the SMGPS (table A5)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName (GLLL.l+B.b or GLLL.lll+BB.bbb)meta.id;meta.maincharGLONGalactic Longitudedegpos.galactic.lonGLATGalactic Latitudedegpos.galactic.latRadRadius assuming circular morphologyarcminphys.angSizefloatRelFrom I to III in decreasing reliability (only for meerkatc.dat) (1)meta.code.qualchar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.raindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decindexedJ/A+A/693/A247/listList of fits imagesNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintObs.dateObservation datestime.epoch;obsnullablesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.raindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decindexedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameNamemeta.id;meta.maincharGLONGagalcitc longitude of center (J2000)degpos.galactic.lonGLATGalactic latitude of center (J2000)degpos.galactic.lat