Stellar dynamics
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A stellar census in globular clusters with MUSE: The contribution of rotation to cluster dynamics studied with 200 000 stars Open
This is the first of a series of papers presenting the results from our\nsurvey of 25 Galactic globular clusters with the MUSE integral-field\nspectrograph. In combination with our dedicated algorithm for source\ndeblending, MUSE provides …
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Merging binaries in the Galactic Center: the eccentric Kozai–Lidov mechanism with stellar evolution Open
Most, if not all, stars in the field are born in binary configurations or higher multiplicity systems. In dense stellar environment such as the Galactic Center (GC), many stars are expected to be in binary configurations as well. These bin…
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A Multimass Velocity Dispersion Model of 47 Tucanae Indicates No Evidence for an Intermediate-mass Black Hole Open
In this paper, we analyze stellar proper motions in the core of the globular cluster 47 Tucanae to explore the possibility of an intermediate-mass black hole (IMBH) influence on the stellar dynamics. Our use of short-wavelength photometry …
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The Global Dynamical Atlas of the Milky Way Mergers: Constraints from Gaia EDR3–based Orbits of Globular Clusters, Stellar Streams, and Satellite Galaxies Open
The Milky Way halo was predominantly formed by the merging of numerous progenitor galaxies. However, our knowledge of this process is still incomplete, especially in regard to the total number of mergers, their global dynamical properties …
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Where are the most ancient stars in the Milky Way? Open
The oldest stars in the Milky Way (MW) bear imprints of the Galaxy's early assembly history. We use FIRE cosmological zoom-in simulations of three MW-mass disc galaxies to study the spatial distribution, chemistry, and kinematics of the ol…
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An unstable truth: how massive stars get their mass Open
The pressure exerted by massive stars' radiation fields is an important mechanism regulating their formation. Detailed simulation of massive star formation therefore requires an accurate treatment of radiation. However, all published simul…
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Multiple Populations in Star Clusters Open
We review the multiple population (MP) phenomenon of globular clusters (GCs): i.e., the evidence that GCs typically host groups of stars with different elemental abundances and/or distinct sequences in photometric diagrams. Most Galactic a…
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The eye of <i>Gaia</i> on globular clusters kinematics: internal rotation Open
We derived the three-dimensional velocities of individual stars in a sample of 62 Galactic globular clusters using proper motions from the second data release of the Gaia mission together with the most comprehensive set of line-of-sight ve…
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A novel look at energy equipartition in globular clusters Open
Two-body interactions play a major role in shaping the structural and dynamical properties of globular clusters (GCs) over their long-term evolution. In particular, GCs evolve towards a state of partial energy equipartition that induces a …
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Secular chaotic dynamics in hierarchical quadruple systems, with applications to hot Jupiters in stellar binaries and triples Open
Hierarchical quadruple systems arise naturally in stellar binaries and\ntriples that harbour planets. Examples are hot Jupiters (HJs) in stellar triple\nsystems, and planetary companions to HJs in stellar binaries. The secular\ndynamical e…
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The distribution of stars around the Milky Way’s central black hole Open
Context . The distribution of stars around a massive black hole (MBH) has been addressed in stellar dynamics for the last four decades by a number of authors. Because of its proximity, the centre of the Milky Way is the only observational …
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IMF shape constraints from stellar populations and dynamics from CALIFA Open
In this letter we describe how we use stellar dynamics information to\nconstrain the shape of the stellar IMF in a sample of 27 early-type galaxies\nfrom the CALIFA survey. We obtain dynamical and stellar mass-to-light ratios,\n$\\Upsilon_…
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Post-Newtonian evolution of massive black hole triplets in galactic nuclei – II. Survey of the parameter space Open
Massive black hole binaries (MBHBs) are expected to form at the centre of merging galaxies during the hierarchical assembly of the cosmic structure, and are expected to be the loudest sources of gravitational waves (GWs) in the low-frequen…
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A high fraction of Be stars in young massive clusters: evidence for a large population of near-critically rotating stars Open
Recent photometric analysis of the colour-magnitude diagrams (CMDs) of young massive clusters (YMCs) have found evidence for splitting in the main sequence and extended main sequence turn-offs, both of which have been suggested to be cause…
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The possible role of stellar mergers for the formation of multiple stellar populations in globular clusters Open
Many possible scenarios for the formation of multiple stellar populations (MSPs) in globular clusters (GCs) have been discussed so far, including the involvement of asymptotic giant branch stars, fast-rotating main-sequence stars, very mas…
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Star–disc interaction in galactic nuclei: orbits and rates of accreted stars Open
We examine the effect of an accretion disc on the orbits of stars in the central star cluster surrounding a central massive black hole by performing a suite of 39 high-accuracy direct N-body simulations using state-of-the art software and …
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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 Open
Galactic center black holes appear to be nearly universally surrounded by dense stellar clusters. When these black holes go through an active accretion phase, the multiple components of the accretion disk, stellar cluster, and black hole s…
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Black Hole Disks in Galactic Nuclei Open
Gravitational torques among objects orbiting a supermassive black hole drive the rapid reorientation of orbital planes in nuclear star clusters (NSCs), a process known as vector resonant relaxation. In this Letter, we determine the statist…
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The signatures of the parental cluster on field planetary systems Open
Due to the high stellar densities in young clusters, planetary systems formed in these environments are likely to have experienced perturbations from encounters with other stars. We carry out direct N-body simulations of multiplanet system…
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The EDGE–CALIFA survey: validating stellar dynamical mass models with CO kinematics Open
Deriving circular velocities of galaxies from stellar kinematics can provide an estimate of their total dynamical mass, provided a contribution from the velocity dispersion of the stars is taken into account. Molecular gas (e.g. CO), on th…
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Gaia unveils the kinematics of multiple stellar populations in 47 Tucanae Open
The series of events, which occurred at high redshift and originated multiple\nstellar populations in Globular Clusters (GCs) are still poorly understood.\nTheoretical work suggests that the present-day dynamics of stars in nearby GCs,\nin…
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Stellar-mass black holes in young massive and open stellar clusters and their role in gravitational-wave generation III: dissecting black hole dynamics Open
Stellar-remnant black holes (BH) in dense stellar clusters comprise a natural\nsetup to trigger general-relativistic (GR) inspiral and merger of binary black\nholes (BBH), detectable by the LISA and the LIGO-Virgo, through dynamical\nencou…
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Kinematical evolution of tidally limited star clusters: rotational properties Open
We present the results of a set of N-body simulations following the long-term\nevolution of the rotational properties of star cluster models evolving in the\nexternal tidal field of their host galaxy, after an initial phase of violent\nrel…
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High-velocity stars from the interaction of a globular cluster and a massive black hole binary Open
High-velocity stars are usually thought to be the dynamical product of the interaction of binary systems with supermassive black holes. In this paper, we investigate a particular mechanism of production of high-velocity stars as due to the…
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Dynamical evolution of stars and gas of young embedded stellar sub-clusters Open
We present simulations of the dynamical evolution of young embedded star\nclusters. Our initial conditions are directly derived from X-ray, infrared, and\nradio observations of local systems, and our models evolve both gas and stars\nsimul…
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Dynamical evolution of multiple-population globular clusters Open
We have carried out a set of Monte Carlo simulations to study a number of fundamental aspects of the dynamical evolution of multiple stellar populations in globular clusters with different initial masses, fractions of second generation (2G…
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Collisional N-body Dynamics Coupled to Self-gravitating Magnetohydrodynamics Reveals Dynamical Binary Formation Open
We describe a star cluster formation model that includes individual star formation from self-gravitating, magnetized gas, coupled to collisional stellar dynamics. The model uses the Astrophysical Multi-purpose Software Environment to integ…
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Star–disc interaction in galactic nuclei: formation of a central stellar disc Open
We perform high resolution direct N-body simulations to study the effect of an accretion disc on stellar dynamics in an active galactic nucleus (AGN). We show that the interaction of the nuclear stellar cluster (NSC) with the gaseous disc …
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Stellar ages, masses, extinctions, and orbital parameters based on spectroscopic parameters of<i>Gaia</i>DR3 Open
Context.Gaia ’s third data release provides radial velocities for 33 million stars and spectroscopically derived atmospheric parameters for more than 5 million targets. When combined with the astrometric data, these allow us to derive orbi…
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Hypervelocity stars from young stellar clusters in the Galactic Centre Open
The enormous velocities of the so called hypervelocity stars (HVSs) derive,\nlikely, from close interactions with massive black holes, binary stars\nencounters or supernova explosions. In this paper, we investigate the origin of\nhypervelo…