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.

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

References in corpus (17)

• The Two Young Star Disks in the Central Parsec of the Galaxy: Properties, Dynamics and Formation
• An Update on Monitoring Stellar Orbits in the Galactic Center
• An Improved Distance and Mass Estimate for Sgr A* from a Multistar Orbit Analysis
• Twelve years of spectroscopic monitoring in the Galactic Center: the closest look at S-stars near the black hole
• Simulations of the formation of stellar discs in the Galactic centre via cloud-cloud collisions
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• On the nature of the fast moving star S2 in the Galactic Center
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• The S-Star Cluster at the Center of the Milky Way: On the nature of diffuse NIR emission in the inner tenth of a parsec
• Polarized light from Sgr A* in the near-infrared $K_s$-band
• On highly eccentric stellar trajectories interacting with a self-gravitating disc in Sgr A*
• The Second Galactic Center Black Hole?; A Possible Detection of Ionized Gas Orbiting around an IMBH embedded in the Galactic Center IRS13E complex
• ALMA Detection of Bipolar Outflows: Evidence for Low Mass Star Formation within 1pc of Sgr A*
• Boxy Orbital Structures in Rotating Bar Models
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Cited by in corpus (15)

• 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*
• An upper limit on the spin of SgrA${}^{\ast }$ based on stellar orbits in its vicinity
• Observation of S4716 -- a Star with a 4 yr Orbit around Sgr A*
• 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
• 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
• 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
• 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*
• Discovery of a Dense Association of Stars in the Vicinity of the Supermassive Black Hole Sgr A*
• Closing the gap: Follow-up observations of peculiar dusty objects close to Sgr A* using ERIS
• Photometric Constraints on Intermediate-mass Black Holes in the Galactic Centre