Kinematic Structure of the Galactic Center S-cluster

Abstract

We present a detailed analysis of the kinematics of 112 stars that mostly comprise the high velocity S-cluster and orbit the super massive black hole SgrA* 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 inclinations, and 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 o 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 o 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 6 Myr ago. Alternatively, it indicated the presence of a disturber at a distance from the center comparable to the distance of the compact stellar association IRS13.

arXiv commentpublished in Astrophysical Journal 23 pages, 6 tabels, 16 figures, ENHANCED GRAPHICS in ApJ in fullorbits.gif circularized.gif normalized.gif

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• Interacting Stellar EMRIs as Sources of Quasi-Periodic Eruptions in Galactic Nuclei
• S62 and S4711: Indications of a population of faint fast moving stars inside the S2 orbit -- S4711 on a 7.6 year orbit around Sgr~A*
• Black Hole Binary Formation in AGN Discs: From Isolation to Merger
• An upper limit on the spin of SgrA${}^{\ast }$ based on stellar orbits in its vicinity
• The young stars in the Galactic Center
• Observation of S4716 -- a Star with a 4 yr Orbit around Sgr A*
• On Socially Distant Neighbors: Using Binaries to Constrain the Density of Objects in the Galactic Center
• The Galactic Center as a laboratory for theories of gravity and dark matter
• Depletion of bright red giants in the Galactic center during its active phases
• A binary system in the S cluster close to the supermassive black hole Sagittarius A*
• The apparent tail of the Galactic center object G2/DSO
• A numerical study of stellar discs in galactic nuclei
• Spinning black holes as cosmic string factories
• First observed interaction of the circumstellar envelope of an S-star with the environment of Sgr A*
• Observation of the apoapsis of S62 in 2019 with NIRC2 and SINFONI
• The evolution of circumstellar discs in the Galactic Centre: an application to the G-clouds
• Resonant Dynamical Friction Around a Super-Massive Black Hole: Analytical Description
• Black Hole Discs and Spheres in Galactic Nuclei -- Exploring the Landscape of Vector Resonant Relaxation Equilibria
• X3: a high-mass Young Stellar Object close to the supermassive black hole Sgr~A*
• The Evaporating Massive Embedded Stellar Cluster IRS 13 Close to Sgr A*. II. Kinematic structure
• Is it possible to measure the Lense-Thirring orbital shifts of the short-period S-star S4716 orbiting Sgr A${}^{\ast }$?
• Candidate Young Stellar Objects in the S-cluster: The Kinematic Analysis of a Sub-population of the Low-mass G-objects close to Sgr A*
• Red giant - jet collisions in galactic nuclei I: 3D hydrodynamical model of a few stellar orbits
• Revisiting Stellar Orbits and the Sgr A${}^{\ast }$ Quadrupole Moment
• Post-Newtonian orbital effects induced by the mass quadrupole and spin octupole moments of an axisymmetric body
• Discovery of a Dense Association of Stars in the Vicinity of the Supermassive Black Hole Sgr A*
• Mass and spin coevolution of black holes inspiralling through dark matter
• Closing the gap: Follow-up observations of peculiar dusty objects close to Sgr A* using ERIS
• The dynamics of S-stars and G-sources orbiting a supermassive compact object made of fermionic dark matter
• Resonant Dynamical Friction in Nuclear Star Clusters: Rapid Alignment of an Intermediate-mass Black Hole with a Stellar Disk
• Photometric Constraints on Intermediate-mass Black Holes in the Galactic Centre
• Binary Dynamics and Mergers in a Stellar Disk and the Formation of Dusty Objects in the Galactic Center
• What does lie at the Milky Way centre? Insights from the S2 star orbit precession
• Implication of spin constraints by the Event Horizon Telescope on stellar orbits in the Galactic Center