Star formation at the Galactic Centre: coevolution of multiple young stellar discs

Abstract

Studies of the Galactic Centre suggest that in-situ star formation may have given rise to the observed stellar population near the central supermassive black hole (SMBH). Direct evidence for a recent starburst is provided by the currently observed young stellar disc (2-7 Myr) in the central 0.5 pc of the Galaxy. This result suggests that star formation in galactic nuclei may occur close to the SMBH and produce initially flattened stellar discs. Here we explore the possible build-up and evolution of nuclear stellar clusters near SMBHs through in-situ star formation producing stellar discs similar to those observed in the Galactic Centre and other nuclei. We make use of N-body simulations to model the evolution of multiple young stellar discs and explore the potential observable signatures imprinted by such processes. Each of the five simulated discs is evolved for 100 Myr before the next one is introduced in the system. We find that populations born at different epochs show different morphologies and kinematics. Older and presumably more metal poor populations are more relaxed and extended, while younger populations show a larger amount of rotation and flattening. We conclude that star formation in central discs can reproduce the observed properties of multiple stellar populations in galactic nuclei differing in age, metallicity and kinematic properties.

arXiv comment12 pages, 13 figures, 2 tables. Accepted for publication in MNRAS

References in corpus (56)

• Monitoring stellar orbits around the Massive Black Hole in the Galactic Center
• Adaptive spatial binning of integral-field spectroscopic data using Voronoi tessellations
• The Galactic Center Massive Black Hole and Nuclear Star Cluster
• High Proper Motion Stars in the Vicinity of Sgr A*: Evidence for a Supermassive Black Hole at the Center of Our Galaxy
• The Two Young Star Disks in the Central Parsec of the Galaxy: Properties, Dynamics and Formation
• SINFONI in the Galactic Center: young stars and IR flares in the central light month
• The Stellar Cusp Around the Supermassive Black Hole in the Galactic Center
• An Update on Monitoring Stellar Orbits in the Galactic Center
• Stellar disk in the galactic center -- a remnant of a dense accretion disk?
• An Extremely Top-Heavy IMF in the Galactic Center Stellar Disks
• A Disk of Young Stars at the Galactic Center as Determined by Individual Stellar Orbits
• The Mass Distribution of Stellar Black Holes
• Stellar Populations in the Central 0.5 pc of the Galaxy II: The Initial Mass Function
• An Improved Distance and Mass Estimate for Sgr A* from a Multistar Orbit Analysis
• Evidence for Warped Disks of Young Stars in the Galactic Center
• The effect of mass-segregation on gravitational wave sources near massive black holes
• Stellar remnants in galactic nuclei: mass segregation
• Strong mass segregation around a massive black hole
• A Cluster of Black Holes at the Galactic Center
• Dissipationless Formation and Evolution of the Milky Way Nuclear Star Cluster
• Co-Evolution of Galactic Nuclei and Globular Cluster Systems
• Simulations of star formation in a gaseous disc around sgr A* - a failed AGN
• Co-evolution of nuclear star clusters, massive black holes and their host galaxies
• An Extended Star Formation History for the Galactic Center from Hubble Space Telescope/NICMOS Observations
• Performance Analysis of Direct N-Body Algorithms on Special-Purpose Supercomputers
• The star formation history of the Milky Way's Nuclear Star Cluster
• The Distribution of Stars and Stellar Remnants at the Galactic Center
• The Evolution of the Globular Cluster System in a Triaxial Galaxy: Can a Galactic Nucleus Form by Globular Cluster Capture?
• Large scale kinematics and dynamical modelling of the Milky Way nuclear star cluster
• Resonant relaxation and the warp of the stellar disc in the Galactic centre
• Self-gravitating accretion disk in Sgr A* few million years ago: was Sgr A* a failed quasar?
• SAPPORO: A way to turn your graphics cards into a GRAPE-6
• On strong mass segregation around a massive black hole: Implications for lower-frequency gravitational-wave astrophysics
• Simulations of the formation of stellar discs in the Galactic centre via cloud-cloud collisions
• Stellar Populations in the Central 0.5 pc of the Galaxy I: A New Method for Constructing Luminosity Functions and Surface-Density Profiles
• Dynamical evolution of the young stars in the Galactic center: N-body simulations of the S-stars
• The nuclear cluster of the Milky Way: Our primary testbed for the interaction of a dense star cluster with a massive black hole
• The Globular Cluster Migratory Origin of Nuclear Star Clusters
• KMOS view of the Galactic Centre I. Young stars are centrally concentrated
• The distribution of stars around the Milky Way's black hole III: Comparison with simulations
• In situ formation of SgrA* stars via disk fragmentation: parent cloud properties and thermodynamics
• New insights on the formation of nuclear star clusters
• Henize 2-10: the ongoing formation of a nuclear star cluster around a massive black hole
• On the rotation of nuclear star clusters formed by cluster-inspirals
• Age and mass segregation of multiple stellar populations in galactic nuclei and their observational signatures
• Evolution of second generation stars in stellar disks of globular and nuclear clusters: Omega Centauri as a test case
• The impact of mass segregation and star-formation on the rates of gravitational-wave sources from extreme mass ratio inspirals
• Effects of Intermediate Mass Black Holes on Nuclear Star Clusters
• Formation and evolution of nuclear star clusters with in-situ star-formation: Nuclear cores and age segregation
• Brownian motion of massive black hole binaries and the final parsec problem
• Dynamical constraints on the origin of the young B-stars in the Galactic center
• Lack of nuclear clusters in dwarf spheroidal galaxies: implications for massive black holes formation and the cusp/core problem
• Probing the formation history of the nuclear star cluster at the Galactic Centre with millisecond pulsars
• The MEGaN project I. Missing formation of massive nuclear clusters and tidal disruption events by star clusters - massive black hole interactions
• On the possibility of a warped disc origin of the inclined stellar discs at the Galactic Centre
• Spiral arms, warping, and clumps formation in the Galactic center young stellar disk

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• Kinematic Structure of the Galactic Center S-cluster
• Detailed abundances in the Galactic center: Evidence of a metal-rich alpha-enhanced stellar population
• A deep view into the nucleus of the Sagittarius Dwarf Spheroidal Galaxy with MUSE. II. Kinematic characterization of the stellar populations
• A KMOS survey of the nuclear disk of the Milky Way I: Survey design and metallicities
• Cool stars in the Galactic Center as seen by APOGEE: M giants, AGB stars and supergiant stars/candidates
• Formation of supermassive black holes in galactic nuclei II: retention and growth of seed intermediate-mass black holes
• Close stellar encounters at the Galactic Centre I: The effect on the observed stellar populations
• A numerical study of stellar discs in galactic nuclei
• Smooth kinematic and metallicity gradients reveal that the Milky Way's nuclear star cluster and disc might be part of the same structure
• 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
• Searching for clues of past binary supermassive black hole mergers in nuclear star clusters
• Hypercompact stellar clusters: morphological renditions and spectro-photometric models
• A Wide Metallicity Range for Gyr-old Stars in the Nuclear Star Cluster
• Resonant Dynamical Friction in Nuclear Star Clusters: Rapid Alignment of an Intermediate-mass Black Hole with a Stellar Disk
• The Nuclear Star Cluster of M 74: a fossil record of the very early stages of a star-forming galaxy