J/ApJ/939/118ivo://CDS.VizieR/J/ApJ/939/118doi:10.26093/cds/vizier.19390118CDSKacharov N.Alfaro-Cuello M.Neumayer N.Lutzgendorf N.Watkins L.L.,Mastrobuono-Battisti A.Kamann S.van de Ven G.Seth A.C.Voggel K.T.,Georgiev I.Y.Leaman R.Bianchini P.Boker T.Mieske S.2025-02-13T20:11:40Z2024-11-20T09:28:19ZCDS support team

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

cds-question@unistra.frgalaxiesspectroscopyvisible-astronomyradial-velocitymetallicityhst-photometryWe present comprehensive multicomponent dynamical models of M54 (NGC6715), the nuclear star cluster of the Sagittarius (Sgr) dwarf galaxy, which is undergoing a tidal disruption in the Milky Way halo. Previous papers in this series used a large MUSE mosaic data set to identify multiple stellar populations in the system and study their kinematic differences. Here, we use Jeans-based dynamical models that fit the population properties (mean age and metallicity), spatial distributions, and kinematics simultaneously. They provide a solid physical explanation for our previous findings. Population-dynamical models deliver a comprehensive view of the whole system, and allow us to disentangle the different stellar populations. We explore their dynamical interplay and confirm our previous findings about the build-up of Sgr's nuclear cluster via contributions from globular cluster stars, Sgr inner field stars, and in situ star formation. We explore various parameterizations of the gravitational potential and show the importance of a radially varying mass-to-light ratio for the proper treatment of the mass profile. We find a total dynamical mass within M54's tidal radius (~75pc) of 1.60+/-0.07x10^6^M_{sun}_ in excellent agreement with N-body simulations. Metal-poor globular cluster stars contribute about 65% of the total mass or 1.04+/-0.05x10^6^M_{sun}_. Metal-rich stars can be further divided into young and intermediate-age populations, which contribute 0.32+/-0.02x10^6^M_{sun}_ (20%) and 0.24+/-0.02x10^6^M_{sun}_ (15%), respectively. Our population-dynamical models successfully distinguish the different stellar populations in Sgr's nucleus because of their different spatial distributions, ages, metallicities, and kinematic features.2022ApJ...939..118Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/939/118CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/195 : Globular Clusters in the Milky Way (Harris, 1996)VII/202 : Globular Clusters in the Milky Way (Harris, 1997)J/AJ/109/218 : Catalogue of globular cluster profiles (Trager+ 1995)J/AJ/119/1760 : M54 and Sgr dSph VI photometry (Layden+, 2000)J/ApJS/161/304 : Star clusters in the MW and satellites (McLaughlin+, 2005)J/AJ/132/447 : Surface Brightness of Gal. Globular Clusters (Noyola+, 2006)J/AJ/133/1658 : ACS survey of galactic globular clusters (Sarajedini+, 2007)J/ApJ/678/116 : AGNs in nuclear star clusters (Seth+, 2008)J/A+A/520/A95 : Abund. of red giants in M54 and Sgr dSph (Carretta+, 2010)J/MNRAS/445/2385 : HST/ACS Coma Cluster Survey. X. (den Brok+, 2014)J/A+A/588/A148 : NGC 6397 stars MUSE spectra (Husser+, 2016)J/MNRAS/505/5978 : Gaia EDR3 view on Gal. globular clusters (Vasiliev+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/939/118https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/939/118http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/939/118https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/939/118https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/939/118http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/939/118GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/939/118/table7 (M54 complete dataset)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/939/118/table7?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/939/118/table7?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/939/118/table7?GETtext/xml+votable180.050000true283.7653198-30.494730.0055555555555555566/480352.3657755224268815e-19 3.5452907792336973e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/939/118?format=asciiOpticaldefaultJ/ApJ/939/118/table7M54 complete datasetFeH[-3.93/0.95]? Metallicityphys.abund.Fedoublenullablee_FeH[1.4e-05/1.7]? Uncertainty in FeHstat.error;phys.abund.FedoublenullableF606W[12.31/24.31] HST/ACS WFC F606W Vega magnitude (1)magphot.mag;em.opt.Rfloate_F606W[0/2] Uncertainty in F606W (1)magstat.error;phot.mag;em.opt.RfloatF814W[11.46/22.94] HST/ACS WFC F814W Vega magnitude (1)magphot.mag;em.opt.Ifloate_F814W[0/2.4] Uncertainty in F814W (1)magstat.error;phot.mag;em.opt.IfloatModeMUSE Mode ("WFM-noAO", "WFM-AO" or "NFM"); see the "Description" sectioninstr.setupcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[6/389623] Sequential identifier for NGC 6715 from Sarajedini et al. (1)meta.id;meta.mainintRAJ2000[283.7/283.8] Right Ascension (J2000) (1)degpos.eq.ra;meta.mainDEJ2000[-30.51/-30.4] Declination (J2000) (1)degpos.eq.dec;meta.mainRVel[-244.7/360.3] Radial velocitykm/sspect.dopplerVelocfloate_RVel[0.19/15] Uncertainty in RVelkm/sstat.error;spect.dopplerVelocfloat