742 citations · 3.2k across the 68 of their papers we have counts for
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The evolution of high-z proto-star clusters into local globular clusters
A. Della Croce, E. Vesperini, R. Pascale +4
The James Webb Space Telescope (JWST) detected numerous massive and relatively compact stellar clumps around proto-galaxies at high redshift (z>0.5). Their properties suggest that…
Massive star clusters detected by JWST as natural birth places to form intermediate-mass black holes
Dominik R. G. Schleicher, Matías Liempi, Mirek Giersz +11
The James Webb Space Telescope (JWST) has detected, through gravitational lensing, several young massive star clusters (YMCs), which are considered as relevant building blocks of h…
Simulations of Globular Cluster Evolution with Multiple Stellar Populations
Mirek Giersz, Abbas Askar, Arkadiusz Hypki +3
The formation of stars with light-element abundance variations in globular clusters and the subsequent dynamical evolution of these multiple populations remains an open question. O…
Formation and growth of intermediate-mass black holes in dense star clusters: Lessons from N-body and MOCCA Monte Carlo Simulations
Abbas Askar, Marcelo C. Vergara, Sohaib Ali
Dense star clusters are promising nurseries for the formation and growth of intermediate-mass black holes (IMBHs; ), with increasing observation…
Self-lensing binaries in globular clusters -- predictions for ELT
Grzegorz Wiktorowicz, Matthew Middleton, Mirek Giersz +4
Self-lensing (SL) represents a powerful technique for detecting compact objects in binary systems through gravitational microlensing effects, when a compact companion transits in f…
Evolution of star clusters with initial bulk rotation via N-body simulations
Abylay Bissekenov, Xiaoying Pang, Albrecht Kamlah +6
Young star clusters can inherit bulk rotation from the molecular clouds from which they have formed. This rotation can affect the long-term evolution of a star cluster and its cons…
Rapid formation of a very massive star >50000 and subsequently an IMBH from runaway collisions. Direct N-body and Monte Carlo simulations of dense star clusters
Marcelo C. Vergara, Abbas Askar, Albrecht W. H. Kamlah +15
Context. We present simulations of a massive young star cluster using \textsc{Nbody6++GPU} and \textsc{MOCCA}. The cluster is initially more compact than previously published model…
Multiple stellar populations in MOCCA globular cluster models: Transient spatial over-concentration of pristine red giant stars driven by strong dynamical encounters
M. Giersz, A. Askar, A Hypki +3
Recent findings show that, in some Milky Way globular clusters (GCs), pristine red giant branch (RGB) stars are more centrally concentrated than enriched RGB stars. This contradict…
MOCCA: Effects of pristine gas accretion and cluster migration on globular cluster evolution, global parameters, and multiple stellar populations
Mirek Giersz, Abbas Askar, Arkadiusz Hypki +3
Using the MOCCA code, we study the evolution of globular clusters (GCs) with multiple stellar populations. For this purpose, the MOCCA code has been significantly extended to take…
Energy equipartition in multiple-population globular clusters
A. R. Livernois, F. I. Aros, E. Vesperini +7
We present the results of Monte Carlo simulations aimed at exploring the evolution towards energy equipartition of first- (1G) and second-generation (2G) stars in multiple-populati…
Gravitational Wave Astronomy With TianQin
En-Kun Li, Shuai Liu, Alejandro Torres-Orjuela +50
The opening of the gravitational wave window has significantly enhanced our capacity to explore the universe's most extreme and dynamic sector. In the mHz frequency range, a divers…
MOCCA: Global properties of tidally filling and underfilling globular star clusters with multiple stellar populations
Arkadiusz Hypki, Enrico Vesperini, Mirek Giersz +5
We explore the evolution of various properties of multiple-population globular clusters (GCs) for a broad range of initial conditions. We simulated over 200 GC models using the MOC…
New Parameters for Star Cluster Dynamics: the role of clusters initial conditions
Bhavana Bhat, Barbara Lanzoni, Enrico Vesperini +4
We recently introduced three new parameters that describe the shape of the normalized cumulative radial distribution (nCRD) of the innermost stars in globular clusters and trace th…
Intermediate-Mass Black Holes in Star Clusters and Dwarf Galaxies
Abbas Askar, Vivienne F. Baldassare, Mar Mezcua
Black holes (BHs) with masses between 100 to 100,000 times the mass of the Sun () are classified as intermediate-mass black holes (IMBHs), potentially representing…
Interpretable machine learning for finding intermediate-mass black holes
Mario Pasquato, Piero Trevisan, Abbas Askar +4
Definitive evidence that globular clusters (GCs) host intermediate-mass black holes (IMBHs) is elusive. Machine learning (ML) models trained on GC simulations can in principle pred…
MOCCA-Survey Database: Extra Galactic Globular Clusters. III. The population of black holes in Milky Way and Andromeda-like galaxies
A. Leveque, M. Giersz, A. Askar +2
In this work, we investigate the black hole (BH) population of globular clusters (GCs) in Milky Way- (MW) and Andromeda- (M31) like galaxies. We combine the population synthesis co…
MOCCA-Survey Database: Extra Galactic Globular Clusters. II. Milky Way and Andromeda
A. Leveque, M. Giersz, M. Arca-Sedda +1
A comprehensive study of the co-evolution of globular cluster systems (GCS) in galaxies requires the ability to model both the large scale dynamics (0.01 - 10 kpc) regulating their…
MOCCA: Dynamics and evolution of binary stars of multiple stellar populations in tidally filling and underfilling globular star clusters
Arkadiusz Hypki, Mirek Giersz, Jongsuk Hong +4
We present an upgraded version of the \MOCCA code for the study of dynamical evolution of globular clusters (GCs) and its first application to the study of evolution of multiple st…
MOCCA-SURVEY Database II -- Properties of Intermediate Mass Black Holes escaping from star clusters
Konrad Maliszewski, Mirek Giersz, Dorota Gondek-Rosińska +2
In this work we investigate properties of intermediate-mass black holes (IMBHs) that escape from star clusters due to dynamical interactions. The studied models were simulated as p…
Using Binaries in Globular Clusters to Catch Sight of Intermediate-Mass Black Holes
Francisco I. Aros, Anna C. Sippel, Alessandra Mastrobuono-Battisti +3
The dynamical evolution of globular clusters (GCs) is tied to their binary population, as binaries segregate to the cluster centre, leading to an increased binary fraction in the c…
Formation of supermassive black holes in galactic nuclei II: retention and growth of seed intermediate-mass black holes
Abbas Askar, Melvyn B. Davies, Ross P. Church
In many galactic nuclei, a nuclear stellar cluster (NSC) co-exists with a supermassive black hole (SMBH). In this work, we explore the idea that the NSC forms before the SMBH throu…
Preparing the next gravitational million-body simulations: Evolution of single and binary stars in Nbody6++GPU, MOCCA and McLuster
A. W. H. Kamlah, A. Leveque, R. Spurzem +9
We present the implementation of updated stellar evolution recipes in the codes \texttt{Nbody6++GPU, MOCCA} and \texttt{McLuster}. We test them through numerical simulations of sta…
Dynamical modelling of globular clusters: challenges for the robust determination of IMBH candidates
Francisco I. Aros, Anna C. Sippel, Alessandra Mastrobuono-Battisti +3
The presence or absence of intermediate-mass black holes (IMBHs) at the centre of Milky Way globular clusters (GCs) is still an open question. This is either due to observational r…
Formation of super-massive black holes in galactic nuclei I: delivering seed intermediate-mass black holes in massive stellar clusters
Abbas Askar, Melvyn B. Davies, Ross P. Church
Supermassive black holes (SMBHs) are found in most galactic nuclei. A significant fraction of these nuclei also contain a nuclear stellar cluster (NSC) surrounding the SMBH. In thi…