Star-disc interactions in a galactic centre and oblateness of the inner stellar cluster

Abstract

Structure of a quasi-stationary stellar cluster is modelled assuming that it is embedded in the gravitational field of a super-massive black hole. Gradual orbital decay of stellar trajectories is caused by the dissipative interaction with an accretion disc. Gravitational field of the disc is constructed and its effect on the cluster structure is taken into account as an axially symmetric perturbation. Attention is focused on a circumnuclear region (r<10^4 gravitational radii) where the effects of the central black hole and the disc dominate over the influence of an outer galaxy. It is shown how the stellar system becomes gradually flattened towards the disc plane. For certain combinations of the model parameters, a toroidal structure is formed by a fraction of stars. Growing anisotropy of stellar velocities as well as their segregation occur. The mass function of the inner cluster is modified and it progressively departs from the asymptotic form assumed in the outer cluster. A new stationary distribution can be characterized in terms of velocity dispersion of the stellar sample in the central region of the modified cluster.

Accepted for publication in MNRAS; 12 pages, 10 figures

References in corpus (17)

• A Fundamental Relation Between Supermassive Black Holes and Their Host Galaxies
• A Relationship Between Nuclear Black Hole Mass and Galaxy Velocity Dispersion
• The slope of the black-hole mass versus velocity dispersion correlation
• Zoom & Whirl: Eccentric equatorial orbits around spinning black holes and their evolution under gravitational radiation reaction
• Models of Galaxies with Central Black Holes: Adiabatic Growth in Spherical Galaxies
• A new Monte Carlo code for star cluster simulations: II. Central black hole and stellar collisions
• Stellar Population in LLAGN.II: STIS observations
• Hydrodynamic Drag on a Compact Star Orbiting a Supermassive Black Hole
• Orbital inspiral into a massive black hole in a galactic center
• Stellar populations in the nuclear regions of nearby radiogalaxies
• Size-Mass-luminosity relations in AGN and the role of the accretion disc
• The role of the central stellar cluster in active galactic nuclei. I. Semi-analytical model
• Evolution of Multi-mass Globular Clusters in Galactic Tidal Field with the Effects of Velocity Anisotropy
• The structure of the central disk of NGC 1068: a clumpy disk model
• Stellar dynamics in a galactic centre surrounded by a massive accretion disc. I. Newtonian description
• Reprocessed emission line profiles from dense clouds in geometrically thick accretion engines
• The Young Starburst Nucleus of the Wolf-Rayet LINER Galaxy NGC 6764

Cited by in corpus (17)

• The Effect of Star--Disk Interactions on Highly Eccentric Stellar Orbits in Active Galactic Nuclei: A Disk Loss Cone and Implications for Stellar Tidal Disruption Events
• Free motion around black holes with discs or rings: between integrability and chaos - II
• Enhanced activity of massive black holes by stellar capture assisted by a self-gravitating accretion disc
• Star-disc interaction in galactic nuclei: orbits and rates of accreted stars
• Quiescent and active galactic nuclei as factories of merging compact objects in the era of gravitational-wave astronomy
• On highly eccentric stellar trajectories interacting with a self-gravitating disc in Sgr A*
• Enhanced accretion rates of stars on Super-massive Black Holes by star-disk interactions in galactic nuclei
• The Effectiveness of the Kozai Mechanism in the Galactic Centre
• The MODEST questions: challenges and future directions in stellar cluster research
• The Newtonian potential of thin disks
• Influence of the black hole spin on the chaotic particle dynamics within a dipolar halo
• Spectral Energy Distribution profiles from AGN accretion disc in multi-gap setup
• Numerical simulation of small perturbation on an accretion disk due to the collision of a star with the disk near the black hole
• Orbital Dynamics with the Gravitational Perturbation due to a Disk
• Interior potential of a toroidal shell from pole values
• The Galactic Center Black Hole Laboratory
• Gravitational Wave Signatures of Quasi-Periodic Eruptions: LISA Detection Prospects for RX J1301.9+2747