J/MNRAS/487/3776ivo://CDS.VizieR/J/MNRAS/487/3776doi:10.26093/cds/vizier.74873776CDSPoci A.McDermid R. M.Zhu L.van de Ven G.2024-08-19T20:19:03Z2019-07-22T13:13:07ZCDS support team

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

cds-question@unistra.frgalaxiesgalaxy-classification-systemsradial-velocitygalaxy-kinematicsWe present a combination of the Schwarzschild orbit-superposition dynamical modelling technique with the spatially-resolved mean stellar age and metallicity maps to uncover the formation history of galaxies. We apply this new approach to a remarkable 5-pointing mosaic of VLT/MUSE observations obtained by Guerou et al. (2016A&A...591A.143G, Cat. J/A+A/591/A143) extending to a maximum galactocentric distance of ~120'' (5.6kpc) along the major axis, corresponding to ~2.5R_e. Our method first identifies 'families' of orbits from the dynamical model that represent dynamically distinct structures of the galaxy. Individual ages and metallicities of these components are then fit for using the stellar-population information. Our results highlight components of the galaxy that are distinct in the combined stellar dynamics/populations space, which implies distinct formation paths. We find evidence for a dynamically-cold, metal-rich disk, consistent with a gradual in-situ formation. This disk is embedded in a generally-old population of stars, with kinematics ranging from dispersion-dominated in the centre to an old, diffuse, metal-poor stellar halo at the extremities. We find also a direct correlation between the dominant dynamical support of these components, and their associated age, akin to the relation observed in the Milky Way. This approach not only provides a powerful model for inferring the formation history of external galaxies, but also paves the way to a complete population-dynamical model.2019MNRAS.487.3776Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/487/3776CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/564/L3 : NGC 3115 globular clusters JHK photometry (Cantiello+, 2014)J/AJ/148/32 : Globular cluster candidates in NGC 3115 (Jennings+, 2014)J/ApJ/808/19 : Megasecond Chandra XVP obs. of NGC3115. II. (Lin+, 2015)J/A+A/591/A143 : NGC 3115 MUSE images (Guerou+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/487/3776https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/487/3776http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/487/3776https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/487/3776https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/487/3776http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/487/3776GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/MNRAS/487/3776/populNGC 3115 populationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNVoronoi bin numbermeta.idfloatxbinVoronoi bin x centroidarcsecpos.cartesian.xdoubleybinVoronoi bin y centroidarcsecpos.cartesian.ydoubleageLWluminosity-weighted mean stellar ageGyrtime.age;stat.meandoublee_ageLWluminosity-weighted mean stellar age errorGyrstat.errordoublemetalLWluminosity-weighted mean stellar metallicityphys.abund.Fedoublee_metalLWluminosity-weighted mean stellar metallicity errorstat.errordouble(M/LV)KBV-band M/L assuming Kroupa (2002Sci...295...82K) IMFsolMass/solLumphys.composition.massLightRatiodoubleJ/MNRAS/487/3776/mge*NGC 3115 mass surface density MGE (table A1)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDensProjected surface mass densitysolMass.pc**-2phot.flux.density.sbdoubleDispProjected dispersionarcsecinstr.dispersiondoubleAxisRatioProjected axis ratiophys.size.axisRatiodoubleJ/MNRAS/487/3776/kinematNGC 3115 kinematicsh3h3 coefficientstat.fit.paramdoublee_sVelocity dispersion errorkm/sstat.errordoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNVoronoi bin numbermeta.idfloatxbinVoronoi bin x centroidarcsecpos.cartesian.xdoubleybinVoronoi bin y centroidarcsecpos.cartesian.ydoubleVMean velocitykm/sphys.veloc;stat.meandoublee_VMean velocity errorkm/sstat.error;pos.cartesian.ydoublesVelocity dispersionkm/sphys.veloc.dispersiondoublee_h3h3 coefficient errorstat.errordoubleh4h4 coefficientstat.fit.paramdoublee_h4h4 coefficient errorstat.errordoubleh5h5 coefficientstat.fit.paramdoublee_h5h5 coefficient errorstat.errordoubleh6h6 coefficientstat.fit.paramdoublee_h6h6 coefficient errorstat.errordouble