The young stars in the Galactic Center

Abstract

We present a large $\sim 30"\times 30"$ spectroscopic survey of the Galactic Center using the SINFONI IFU at the VLT. Combining observations of the last two decades we compile spectra of over $2800$ stars. Using the Bracket-$\gamma$ absorption lines we identify $195$ young stars, extending the list of known young stars by $79$. In order to explore the angular momentum distribution of the young stars, we introduce an isotropic cluster prior. This prior reproduces an isotropic cluster in a mathematically exact way, which we test through numerical simulations. We calculate the posterior angular momentum space as function of projected separation from Sgr~A*. We find that the observed young star distribution is substantially different from an isotropic cluster. We identify the previously reported feature of the clockwise disk and find that its angular momentum changes as function of separation from the black hole, and thus confirm a warp of the clockwise disk ($p\sim 99.2\%$). At large separations, we discover three prominent overdensities of angular momentum. One overdensity has been reported previously, the counter-clockwise disk. The other two are new. Determining the likely members of these structures, we find that as many as $75\%$ of stars can be associated with one of these features. Stars belonging to the warped clockwise-disk show a top heavy K-band luminosity function, while stars belonging to the larger separation features do not. Our observations are in good agreement with the predictions of simulations of in-situ star formation, and argue for common formation of these structures.

Accepted for Publication in APJL

References in corpus (16)

• 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
• The mass distribution in the Galactic Centre from interferometric astrometry of multiple stellar orbits
• Improved GRAVITY astrometric accuracy from modeling of optical aberrations
• Simulations of star formation in a gaseous disc around sgr A* - a failed AGN
• Star Formation Around Super-Massive Black Holes
• Kinematics of the old stellar population at the Galactic Center
• 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
• Dynamical evolution of the young stars in the Galactic center: N-body simulations of the S-stars
• The Milky Way's nuclear star cluster: Old, metal-rich, and cuspy
• A numerical study of vector resonant relaxation
• Kinematic Structure of the Galactic Center S-cluster
• Maximum-likelihood detection of sources among Poissonian noise
• Young stellar cluster dilution near supermassive black holes: the impact of Vector Resonant Relaxation on neighbour separation

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