Central Dynamics of Multi-mass Rotating Star Clusters

Abstract

We investigate the evolutionary nexus between the morphology and internal kinematics of the central regions of collisional, rotating, multi-mass stellar systems, with special attention to the spatial characterisation of the process of mass segregation. We report results from idealized, purely $N$-body simulations that show multi-mass, rotating, and spherical systems rapidly form an oblate, spheroidal massive core, unlike single-mass rotating or multi-mass non-rotating configurations with otherwise identical initial properties, indicating that this evolution is a result of the interplay between the presence of a mass spectrum and angular momentum. This feature appears to be long-lasting, preserving itself for several relaxation times. The degree of flattening experienced by the systems is directly proportional to the initial degree of internal rotation. In addition, this morphological effect has a clear characterisation in terms of orbital architecture, as it lowers the inclination of the orbits of massive stars. We offer an idealised dynamical interpretation that could explain the mechanism underpinning this effect and we highlight possible useful implications, from kinematic hysteresis to spatial distribution of dark remnants in dense stellar systems.

arXiv comment13 pages, 12 figures, Accepted for publication in MNRAS

References in corpus (47)

• Resonant Relaxation in Stellar Systems
• Accelerating NBODY6 with Graphics Processing Units
• A stellar census in globular clusters with MUSE: The contribution of rotation to cluster dynamics studied with 200 000 stars
• Mass segregation and fractal substructure in young massive clusters: (I) the McLuster code and method calibration
• A dynamical origin for early mass segregation in young star clusters
• Hubble Space Telescope proper motion (HSTPROMO) catalogs of Galactic globular clusters. II. Kinematic profiles and maps
• Homogeneous photometry VII. Globular clusters in the Gaia era
• Mass segregation in young compact star clusters in the Large Magellanic Cloud: II. Mass Functions
• The internal rotation of globular clusters revealed by Gaia DR2
• No Energy Equipartition in Globular Clusters
• Dynamics of cluster-forming hub-filament systems: The case of the high-mass star-forming complex Monoceros R2
• Evidence for primordial mass segregation in globular clusters
• Rotating Globular Clusters
• A Dynamical Signature of Multiple Stellar Populations in 47 Tucanae
• The eye of Gaia on globular clusters kinematics: internal rotation
• A novel look at energy equipartition in globular clusters
• Central rotations of Milky Way Globular Clusters
• N-body Models of Rotating Globular Clusters
• Intermediate Mass Black Hole Induced Quenching of Mass Segregation in Star Clusters
• Hubble Space Telescope Proper Motion (HSTPROMO) Catalogs of Galactic Globular Clusters. V. The rapid rotation of 47 Tuc traced and modeled in three dimensions
• MIKiS: the Multi-Instrument Kinematic Survey of Galactic Globular Clusters. I. Velocity dispersion profiles and rotation signals of 11 globular clusters
• Black Hole Disks in Galactic Nuclei
• Differences in the rotational properties of multiple stellar populations in M 13: a faster rotation for the "extreme" chemical subpopulation
• Three-Component Kinematics of Multiple Stellar Populations in Globular Clusters with Gaia and VLT
• Self-consistent models of quasi-relaxed rotating stellar systems
• Comparative study between N-body and Fokker-Planck simulations for rotating star clusters - II. 2-component models
• Dynamical Evolution of Rotating Stellar Systems: III. The Effect of Mass Spectrum
• The Intrinsic Shapes of Stellar Systems
• The strong rotation of M5 (NGC 5904) as seen from the MIKiS Survey of Galactic Globular Clusters
• Kinematical evolution of tidally limited star clusters: rotational properties
• Systematic errors in Gaia DR2 astrometry and their impact on measurements of internal kinematics of star clusters
• Mass segregation in star clusters is not energy equipartition
• Kinematical evolution of tidally limited star clusters: the role of retrograde stellar orbits
• Do star clusters form in a completely mass-segregated way?
• Evolution of fractality and rotation in embedded star clusters
• The Flattening of Globular Clusters
• The orbital anisotropy profiles of nearby globular clusters from Gaia Data Release 2
• Structure and rotation of young massive star clusters in a simulated dwarf starburst
• Linking the rotation of a cluster to the spins of its stars: The kinematics of NGC6791 and NGC6819 in 3D
• The ESO Multi-Instrument Kinematic Survey (MIKiS) of Galactic Globular Clusters: solid body rotation and anomalous velocity dispersion profile in NGC 5986
• The Thermodynamics of Rotating Black-Hole Star Clusters
• Mapping the stability of stellar rotating spheres via linear response theory
• Anisotropic Mass Segregation in Rotating Globular Clusters
• Resonant relaxation in globular clusters
• Mass Segregation in Eccentric Nuclear Disks: Enhanced Tidal Disruption Event Rates for High Mass Stars
• Stability of rotating spherical stellar systems
• The evolution of kicked stellar-mass black holes in star cluster environments II. Rotating star clusters

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