Trojan Stars in the Galactic Center

Abstract

We performed, for the first time, the simulation of spiral-in of a star cluster formed close to the Galactic center (GC) using a fully self-consistent $N$-body model. In our model, the central super-massive black hole (SMBH) is surrounded by stars and the star cluster. Not only are the orbits of stars and the cluster stars integrated self-consistently, but the stellar evolution, collisions and merging of the cluster stars are also included. We found that an intermediate-mass black hole (IMBH) is formed in the star cluster and stars escaped from the cluster are captured into a 1:1 mean motion resonance with the IMBH. These "Trojan" stars are brought close to the SMBH by the IMBH, which spirals into the GC due to the dynamical friction. Our results show that, once the IMBH is formed, it brings the massive stars to the vicinity of the central SMBH even after the star cluster itself is disrupted. Stars carried by the IMBH form a disk similar to the observed disks and the core of the cluster including the IMBH has properties similar to those of IRS13E, which is a compact assembly of several young stars.

17 pages, 9 figures, accepted for publication in ApJ

References in corpus (10)

• The Two Young Star Disks in the Central Parsec of the Galaxy: Properties, Dynamics and Formation
• Simulations of star formation in a gaseous disc around sgr A* - a failed AGN
• BRIDGE: A Direct-tree Hybrid N-body Algorithm for Fully Self-consistent Simulations of Star Clusters and their Parent Galaxies
• Simulations of the formation of stellar discs in the Galactic centre via cloud-cloud collisions
• On the evolution and fate of supermassive stars
• The evolution of very massive stars
• Evolution of Collisionally Merged Massive Stars
• Mixing in massive stellar mergers
• Evolution of Star Clusters near the Galactic Center: Fully Self-consistent N-body Simulations
• In situ formation of the massive stars around SgrA*

Cited by in corpus (31)

• The Galactic Center Massive Black Hole and Nuclear Star Cluster
• Nuclear Star Clusters
• The Origin of OB Runaway Stars
• Origin and growth of nuclear star clusters around massive black holes
• Perturbations of Intermediate-mass Black Holes on Stellar Orbits in the Galactic Center
• In situ formation of SgrA* stars via disk fragmentation: parent cloud properties and thermodynamics
• The formation and dynamical evolution of young star clusters
• The formation of young dense star clusters through mergers
• A Semi-Analytic dynamical friction model that reproduces core stalling
• Effects of Intermediate Mass Black Holes on Nuclear Star Clusters
• 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
• GC-IRS13E - A puzzling association of three early-type stars
• The Galactic Centre star S2 as a dynamical probe for intermediate-mass black holes
• Dynamical constraints on the origin of the young B-stars in the Galactic center
• The initial mass function of star clusters that form in turbulent molecular clouds
• Simulations predict intermediate-mass black hole formation in globular clusters
• Localizing Sagittarius A* and M87 on Microarcsecond Scales with Millimeter VLBI
• Corrective effect of many-body interactions in dynamical friction
• The growth of massive stars via stellar collisions in ensemble star clusters
• The Keplerian three-body encounter I. Insights on the origin of the S-stars and the G-objects in the Galactic center
• The Galactic Center as a laboratory for theories of gravity and dark matter
• The Fifth Candidate for an Intermediate-mass Black Hole in the Galactic Center
• The origin of S-stars and a young stellar disk: distribution of debris stars of a sinking star cluster
• Eccentric disc instability in stellar discs formed from inspiraling gas clouds in the Galactic Centre
• SIRIUS project II: a new tree-direct hybrid code for smoothed particle hydrodynamics/N-body simulations of star clusters
• Density Wakes due to Dynamical Friction in Cored Potentials
• On the dissolution of star clusters in the Galactic centre. I. Circular orbits
• Astrometric Detection of Intermediate-Mass Black Holes At the Galactic Centre
• Trigonometric parallax and proper motion of Sagittarius A* measured by VERA using the new broad-band back-end system OCTAVE-DAS
• Dynamics of star associations in an SMBH-IMBH system: The case of IRS13 in the Galactic centre
• Mass and Spin Growth of Very Massive Stars in Star Clusters Potentially Associated with Little Red Dots