J/ApJ/896/100ivo://CDS.VizieR/J/ApJ/896/100doi:10.26093/cds/vizier.18960100CDSAli B.Paul D.Eckart A.Parsa M.Zajacek M.Peissker F.,Subroweit M.M. Valencia-SThomkins L.Witzel G.2022-03-10T11:28:22Z2021-11-29T09:26:02ZCDS support team

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

cds-question@unistra.frgalactic-centerinfrared-sourcesstellar-associationsWe present a detailed analysis of the kinematics of 112 stars that mostly comprise the high-velocity S cluster and orbit the supermassive black hole Sgr A* at the center of the Milky Way. For 39 of them, orbital elements are known; for the remainder, we know proper motions. The distribution of the inclinations and the proper motion flight directions deviate significantly from a uniform distribution, which one expects if the orientation of the orbits are random. Across the central arcseconds, the S-cluster stars are arranged in two almost edge-on disks that are located at a position angle approximately +/-45{deg} with respect to the Galactic plane. The angular momentum vectors for stars in each disk point in both directions, i.e., the stars in a given disk rotate in opposite ways. The poles of this structure are located only about 25{deg} from the line of sight. This structure may be the result of a resonance process that started with the formation of the young B-dwarf stars in the cluster about 6Myr ago. Alternatively, it indicated the presence of a disturber at a distance from the center comparable to the distance of the compact stellar association IRS 13.2020ApJ...896..100Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/896/100CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/643/1011 : Early-type stars in the center of the Galaxy (Paumard+, 2006)J/A+A/499/483 : NIR obs. of sources in galactic center (Buchholz+, 2009)J/A+A/502/91 : Proper motions of stars near SgrA* (Schoedel+, 2009)J/ApJ/779/L6 : 3D kinematic obs. of stars in Galactic Centre (Do+, 2013)J/ApJ/783/131 : Kinematic of stars in Galactic center (Yelda+, 2014)J/ApJ/808/106 : NIR spectroscopic obs. in the Galactic Center (Stostad+, 2015)J/ApJ/830/17 : Gal. Center secondary IR astrometric standards (Boehle+, 2016)J/ApJ/837/30 : 25yrs obs. of stellar orbits in the GC (Gillessen+, 2017)J/A+A/641/A102 : Milky Way nuclear star cluster HKs phot. (Schoedel+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/896/100https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/896/100http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/896/100https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/896/100https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/896/100http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/896/100GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/896/100/orbit (Orbital elements for stars in the black disk (Table 2) and in the red disk (Table 3))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/896/100/orbit?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/896/100/orbit?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/896/100/orbit?GETtext/xml+votable180.050000true266.4168408-29.00786780.0055555555555555566/28830https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/896/100?format=asciiInfrareddefaultJ/ApJ/896/100/orbitOrbital elements for stars in the black disk (Table 2) and in the red disk (Table 3)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDiskBlack or red diskobs.fieldcharNameStar namemeta.id;meta.mainchara[3.6/184.2] Semi-major axis, in milli-parsec unitsmpcphys.angSize.smajAxis;src.orbitalfloate_a[0.001/11] Uncertainty in ampcstat.errorfloate[0.08/1] Ellipticitysrc.ellipticityfloate_e[0/0.3] Uncertainty in estat.errorfloati[24.6/157.8] Inclinationdegsrc.orbital.inclinationfloate_i[0.001/22] Uncertainty in idegstat.errorfloatomega[11/379] Argument of periapsedegsrc.orbital.periastronfloate_omega[0.001/32] Uncertainty in omegadegstat.errorfloatOmega[14.3/353] Longitude of ascending nodedegsrc.orbital.nodefloate_Omega[0.001/27] Uncertainty in Omegadegstat.errorfloatTclos[627.6/2161.6] Time of closest approachyrtime.epochdoubleq_TclosUncertainty flag on Tclosmeta.code.qualchare_Tclos[0.001/23] Uncertainty in Tclosyrstat.errorfloatSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.mainnullable_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainnullableJ/ApJ/896/100/posangPosition angles of the black disk (Table 4), the red disk (Table 5) and the linear stellar trajectories (Table 6)PA[-169.7/178] Position angle, {phi}degpos.posAngdoublee_PA[0.05/18] Uncertainty in PAdegstat.errorfloatNameStar namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDiskBlack disk, red disk or linear stellar trajectories ("st")obs.fieldcharm1[-22.8/29.1] slope, R.A. data as a function of timemas/yrstat.fit.paramfloate_m1[0.005/2] Uncertainty in m1mas/yrstat.errorfloatm2[-22.3/29] slope, Dec. data as a function of timemas/yrstat.fit.paramfloate_m2[0.005/1.8] Uncertainty in m2mas/yrstat.errorfloat