J/MNRAS/516/1320ivo://CDS.VizieR/J/MNRAS/516/1320doi:10.26093/cds/vizier.75161320CDSChies-Santos A.L.de Souza R.S.Caso J.P.Ennis A.Ide Souza C.P.E.,Barbosa R.S.Chen P.Cenarro A.J.Ederoclite A.Cristobal-Hornillos D.,Hernandez-Monteagudo C.Lopez-Sanjuan C.Marin-Franch A.Moles M.,Varela J.Vazquez Ramio H.Dupke R.Sodre L.Jr.Angulo R.E.2024-08-22T20:16:18Z2022-09-05T08:35:19ZCDS support team

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

cds-question@unistra.frgalaxiesglobular-star-clustersvisible-astronomysloan-photometryGlobular clusters (GCs) are proxies of the formation assemblies of their host galaxies. However, few studies exist targeting GC systems of spiral galaxies up to several effective radii. Through 12-band Javalambre Photometric Local Universe Survey (J-PLUS) imaging, we study the point sources around the M81/M82/NGC3077 triplet in search of new GC candidates. We develop a tailored classification scheme to search for GC candidates based on their similarity to known GCs via a principal components analysis (PCA) projection. Our method accounts for missing data and photometric errors. We report 642 new GC candidates in a region of 3.5deg^2^ around the triplet, ranked according to their Gaia astrometric proper motions when available. We find tantalising evidence for an overdensity of GC candidate sources forming a bridge connecting M81 and M82. Finally, the spatial distribution of the GC candidates (g-i) colours is consistent with halo/intra-cluster GCs, i.e. it gets bluer as they get further from the closest galaxy in the field. We further employ a regression-tree based model to estimate the metallicity distribution of the GC candidates based on their J-PLUS bands. The metallicity distribution of the sample candidates is broad and displays a bump towards the metal-rich end. Our list increases the population of GC candidates around the triplet by 3-fold, stresses the usefulness of multi-band surveys in finding these objects, and provides a testbed for further studies analysing their spatial distribution around nearby (spirals) galaxies.2022MNRAS.516.1320Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/516/1320CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-tohttps://www.j-plus.es/ancillarydata/dr2_M81_triplet_GC_candidates : Home PageI/350 : Gaia EDR3 (Gaia Collaboration, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/516/1320https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/516/1320http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/516/1320https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/516/1320https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/516/1320http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/516/1320GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/516/1320/tablea1 (Spectroscopically confirmed GCs from the literature in increasing order of right ascension)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/516/1320/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/516/1320/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/516/1320/tablea1?GETtext/xml+votable180.050000true148.26333369.2298330.005555555555555556Cone search capability for table J/MNRAS/516/1320/catalog (J-PLUS DR2 M81 triplet globular cluster candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/516/1320/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/516/1320/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/516/1320/catalog?GETtext/xml+votable180.050000true147.134625370.12496090.0055555555555555565/1901 6/7582 7601 7603 7609 76122.040811542443644e-19 4.653515163505597e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/516/1320?format=asciiOpticaldefaultJ/MNRAS/516/1320/tablea1Spectroscopically confirmed GCs from the literature in increasing order of right ascensionSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDEJ2000Declination (J2000)pos.eq.dec;meta.mainNameCluster namemeta.id;meta.maincharr_NameReference for Name (1)meta.ref;pos.framecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainrmag? J-PLUS r magnitudemagphot.mag;em.opt.Rfloatnullableg-i? J-PLUS g-i colour indexmagphot.colorfloatnullable[Fe/H]? Metallicity estimatephys.abund.ZfloatnullableJ/MNRAS/516/1320/catalogJ-PLUS DR2 M81 triplet globular cluster candidatesJ378J378 magnitudemagphot.mag;em.optfloatgmagSDSS g magnitudemagphot.mag;em.opt.BfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainumag? JAVA u magnitudemagphot.mag;em.opt.Ufloatnullablee_umag? Error in u_java magnitudemagstat.error;phot.magfloatnullablee_gmagError in g_sdss magnitudemagstat.error;phot.magfloatrmagSDSS r magnitudemagphot.mag;em.opt.Rfloate_rmagError in r_sdss magnitudemagstat.error;phot.magfloatimagSDSS i magnitudemagphot.mag;em.opt.Ifloate_imagError in i_sdss magnitudemagstat.error;phot.magfloatzmagSDSS z magnitudemagphot.mag;em.opt.Ifloate_zmagError in z magnitudemagstat.error;phot.magfloate_J378Error in J378 magnitudemagstat.errorfloatJ395J395 magnitudemagphot.mag;em.optfloate_J395Error in J395 magnitudemagstat.errorfloatJ410J410 magnitudemagphot.mag;em.optfloate_J410Error in J410 magnitudemagstat.errorfloatJ430? J430 magnitudemagphot.mag;em.optfloatnullablee_J430? Error in J430 magnitudemagstat.errorfloatnullableJ515? J515 magnitudemagphot.mag;em.optfloatnullablee_J515? Error in J515 magnitudemagstat.errorfloatnullableJ660J660 magnitudemagphot.mag;em.optfloate_J660Error in J660 magnitudemagstat.errorfloatJ861J861 magnitudemagphot.mag;em.optfloate_J861Error in J861magstat.errorfloatPMGAIA EDR3 total proper motionmas/yrpos.pmfloat